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WO2018212123A1 - Moteur et dispositif de direction assistée électrique - Google Patents

Moteur et dispositif de direction assistée électrique Download PDF

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Publication number
WO2018212123A1
WO2018212123A1 PCT/JP2018/018492 JP2018018492W WO2018212123A1 WO 2018212123 A1 WO2018212123 A1 WO 2018212123A1 JP 2018018492 W JP2018018492 W JP 2018018492W WO 2018212123 A1 WO2018212123 A1 WO 2018212123A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat sink
axial direction
hole
coil support
support member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/018492
Other languages
English (en)
Japanese (ja)
Inventor
良 荻野
俊哉 岡本
剛央 新子
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Priority to CN202111079543.3A priority Critical patent/CN113612333B/zh
Priority to CN201880032106.6A priority patent/CN110622396B/zh
Publication of WO2018212123A1 publication Critical patent/WO2018212123A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0418—Electric motor acting on road wheel carriers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges

Definitions

  • the present invention relates to a motor and an electric power steering apparatus.
  • An electromechanically integrated motor in which a motor main body having a rotor and a stator and a controller for controlling the motor main body are integrally arranged.
  • An example of such a motor is an electronic device disclosed in Japanese Patent Laid-Open No. 2016-034203 (Patent Document 1). *
  • An electronic device disclosed in Patent Document 1 includes a housing having a facing surface disposed with a gap between the substrate and a protruding portion protruding toward a position different from the electronic component.
  • the height of the protruding portion is higher than the height of the electronic component and smaller than the gap.
  • Patent Document 1 discloses that the provision of the protruding portion suppresses the radiation gel from dropping into the shaft hole through which the shaft is inserted.
  • Patent Document 1 has a problem in that since the protrusion is provided, the axial dimension is large.
  • an object of the present invention is to provide a motor and an electric power steering device that reduce the axial dimension and prevent a heat radiating member such as a heat radiating gel from entering the stator.
  • One aspect of the motor of the present invention includes a rotor including a shaft extending in the axial direction, a stator including a coil formed by winding a coil wire around a radially outer side of the rotor, and an axially upper side of the stator.
  • a coil support member that is arranged and inserted with a coil wire and formed of an insulating material; a heat sink that is disposed on the upper side in the axial direction of the stator and that has a through hole through which the coil support member is inserted; and an upper side in the axial direction of the heat sink
  • the heat sink is provided with a recess that is located at the upper end of the through hole and has a bottom exposed when viewed from the upper side in the axial direction, and a top surface of the coil support member. The position in the axial direction differs from the bottom surface of the recess.
  • FIG. 1 is a cross-sectional view of a motor according to the first embodiment.
  • FIG. 2 is a cross-sectional view of the housing and the flange in the first embodiment.
  • FIG. 3 is an enlarged view of a region corresponding to the region III in FIG. 2 in the motor of the modified example of the first embodiment.
  • FIG. 4 is another modification of FIG.
  • FIG. 5 is a bottom view of the cover according to the first embodiment.
  • FIG. 6 is an enlarged view of a region VI in FIG.
  • FIG. 7 is a modification of FIG.
  • FIG. 8 is another modification of FIG.
  • FIG. 9 shows another modification of FIG.
  • FIG. 10 is a schematic diagram of the stator in the first embodiment.
  • FIG. 11 is a perspective view of the bus bar holding member according to the first embodiment.
  • FIG. 12 is a perspective view of the coil support member in the first embodiment.
  • FIG. 13 is a perspective view of the bus bar holding member and the coil support member in the first embodiment.
  • FIG. 14 is a bottom view of the bus bar holding member and the coil support member in the first embodiment.
  • FIG. 15 is a bottom view of the substrate in the first embodiment.
  • FIG. 16 is a cross-sectional view of the substrate and the conductive member in the first embodiment.
  • FIG. 17 is a plan view of the heat sink in the first embodiment.
  • FIG. 18 is a bottom view of the heat sink in the first embodiment.
  • FIG. 19A is a plan view schematically showing FIG.
  • FIG. 19B is a modification of FIG. 19A.
  • FIG. 19C is a modification of FIG. 19A.
  • FIG. 20 is a plan view of the coil support member and the heat sink that support the coil wires in the first embodiment.
  • FIG. 21 is a cross-sectional view taken along line XXI-XXI in FIG.
  • FIG. 22 is another cross-sectional view along the line XXI-XXI in FIG.
  • FIG. 23 is a schematic diagram illustrating a relationship between the heat sink through hole and the coil support member in the first embodiment.
  • FIG. 21 is a schematic diagram illustrating another relationship between the heat sink through hole and the coil support member in the first embodiment.
  • FIG. 25 is a schematic diagram showing still another relationship between the heat sink through hole and the coil support member in the first embodiment.
  • FIG. 26 is an enlarged view of the heat sink through hole and the coil support member in the first embodiment.
  • FIG. 27 is a modification of FIG.
  • FIG. 28 is a schematic diagram of a process of inserting a heat sink into the coil support member from above in the first embodiment.
  • FIG. 29A is a schematic diagram of a heat sink and a substrate.
  • FIG. 29B is a modification of FIG. 29A.
  • FIG. 30 is a side view of the connector according to the first embodiment.
  • FIG. 31 is a perspective view of the connector according to the first embodiment.
  • FIG. 32 is a perspective view of a heat sink and a connector in the first embodiment.
  • FIG. 33 is a schematic diagram of the electric power steering apparatus according to the second embodiment.
  • the central axis A of the rotor that is, the axial direction in which the shaft extends is defined as the vertical direction.
  • the substrate side is the upper side and the bottom side of the housing is the lower side.
  • the vertical direction in this specification is for use in specifying the positional relationship, and does not limit the actual direction. That is, the downward direction does not necessarily mean the direction of gravity.
  • a direction perpendicular to the central axis A of the rotor is a radial direction, and the radial direction is centered on the central axis A.
  • the circumference of the center axis A of the rotor is the circumferential direction.
  • extending in the axial direction includes a state that extends strictly in the axial direction and a state that extends in a direction inclined by less than 45 degrees with respect to the axial direction.
  • extends in the radial direction includes a state that extends strictly in the radial direction and a state that extends in a direction inclined in a range of less than 45 degrees with respect to the radial direction.
  • fitting means fitting a fitting in shape. What matched the shape includes a case where the shape is the same, a case where the shape is similar, and a case where the shapes are different. In the case where the matching shape is a concavo-convex shape, at least a part of one convex portion is located in the other concave portion.
  • the “gap” means a gap intentionally provided. That is, a gap designed so as not to contact the members is defined as the gap.
  • Embodiment 1 A motor that is Embodiment 1 of the present invention will be described with reference to FIGS.
  • the motor according to the first embodiment has a two-system configuration including two sets of U-phase, V-phase, and W-phase. *
  • the motor 1 includes a housing 10, a flange 20, a cover 30, a rotor 40, bearings 43 and 44, a stator 50, a coil support member 60, a substrate 70 and an electronic component 80.
  • the control part which has, the heat sink 100, and the connector 200 are mainly provided. *
  • the housing 10 accommodates the rotor 40, the stator 50, and the bearings 43 and 44 inside.
  • the housing 10 extends in the axial direction and opens upward.
  • the housing 10 includes a first cylinder part 11, a contact part 12, a second cylinder part 13, and a bottom part 14.
  • the housing 10 of this embodiment is a press-molded product.
  • the thickness of the 1st cylinder part 11, the contact part 12, the 2nd cylinder part 13, and the bottom part 14 is the same. Note that “same” means that they are not intentionally formed with different thicknesses, and the difference in thickness due to drawing in press molding is regarded as the same. *
  • the first cylinder part 11 and the second cylinder part 13 are cylindrical with the central axis A as the center.
  • the cylindrical shape is a hollow shape, and may be circular or polygonal in plan view.
  • the 1st cylinder part 11 accommodates the stator 50 in an inside. *
  • the contact portion 12 extends radially inward from the axial lower end of the first tube portion 11.
  • the stator 50 is in contact with the inner upper surface of the contact portion 12.
  • the housing lower surface 12a of the contact portion 12 is a flat surface extending in the radial direction as shown in FIG.
  • the housing lower surface 12a of the contact portion 12 may extend axially upward as it goes radially inward from the first tube portion 11 as shown in FIG. 3, and the first tube portion 11 as shown in FIG. May extend downward in the axial direction as it goes radially inward.
  • the housing lower surface 12a of the contact portion 12 may be a curved surface (not shown). *
  • the second cylindrical portion 13 has a cylindrical shape extending from the radially inner end of the contact portion 12 to the lower side in the axial direction and having an outer diameter smaller than that of the first cylindrical portion 11.
  • the 2nd cylinder part 13 has the upper side cylinder part 13a, the lower side cylinder part 13b, and the connection part 13c.
  • the lower cylinder part 13b has an outer diameter smaller than that of the upper cylinder part 13a.
  • the connection part 13c connects the upper cylinder part 13a and the lower cylinder part 13b.
  • the bottom portion 14 extends radially inward from the lower end in the axial direction of the second cylindrical portion 13. The bottom portion 14 closes the housing 10.
  • the flange 20 includes a flange tube portion 21 and a flange plane portion 22.
  • the flange 20 of this embodiment is a press-molded product.
  • the thickness of the flange cylinder part 21 and the flange plane part 22 is the same.
  • the flange tube portion 21 is fixed to the outer surface of the second tube portion 13 of the housing 10.
  • the flange cylinder portion 21 has a cylindrical shape centered on the central axis A and is larger than the outer diameter of the second cylinder portion 13.
  • the axial length of the flange cylindrical portion 21 is shorter than the axial length of the second cylindrical portion 13.
  • the flange cylindrical portion 21 may have an outer surface and an inner surface extending along the axial direction. Moreover, as shown in FIG. 4, the flange cylinder part 21 may incline the upper part of an outer surface and an inner surface.
  • the flange flat surface portion 22 extends radially outward from the axial lower end of the flange tube portion 21. When viewed from the upper side in the axial direction, the flange plane portion 22 protrudes radially outward from the first tube portion 11.
  • the flange plane portion 22 has a fixing hole portion 23 for fixing to an external device of the motor 1 at a plurality of locations.
  • the upper end 21 a of the flange cylindrical portion 21 contacts the housing lower surface 12 a of the contact portion 12 of the housing 10. That is, at least a part of the upper end 21a of the flange cylindrical part 21 and at least a part of the housing lower surface 12a of the contact part 12 are in contact with each other.
  • the housing lower surface 12 a of the contact portion 12 is a flat surface extending in the radial direction
  • the upper end 21 a of the flange tube portion 21 is a flat surface extending in the radial direction. At least a part of the surface comes into contact with at least a part of the flat surface of the flange tube portion.
  • the contact portion 12 extends axially upward as it goes radially inward from the first tube portion 11. Since the upper end 21 a of the flange tube portion 21 is a flat surface extending in the radial direction, the corner portion between the upper end surface and the inner side surface of the flange tube portion 21 enters the contact portion 12. Therefore, the housing 10 is less likely to come out of the flange 20. *
  • the contact portion 12 extends downward in the axial direction as it goes radially inward from the first tube portion 11.
  • the upper end 21 a of the flange tube portion 21 is in contact with the housing lower surface 12 a of the contact portion 12 and extends outward in the axial direction along the contact portion 12. Therefore, the housing 10 is less likely to come out of the flange 20.
  • the cover 30 covers at least a part of the upper side in the axial direction of the substrate 70 and the connector 200.
  • the cover 30 includes a disk-shaped portion 30 a that overlaps the housing 10 when viewed from the upper side in the axial direction, and a rectangular portion 30 b that faces the connector.
  • the rectangular portion 30b includes an outer end region R having a cover outer end edge 31 that is a radially outer end edge.
  • the “cover outer edge 31” means the outer edge of the cover 30.
  • the “outer end region R” means a predetermined region that includes the cover outer end edge 31 and goes inward from the cover outer end edge 31.
  • the cover 30 includes a covering wall 32, a cover concave portion 33, a cover convex portion 34, and a cover step portion 35 (see FIG. 1). *
  • the covering wall 32 extends downward in the axial direction from the cover outer edge 31 that is a radially outer edge, and covers at least a part of the connector outer edge 216 that is a radially outer edge of the connector 200 described later.
  • the cover recess 33 is formed radially inward of the covering wall 32 and is recessed in the axial direction. As shown in FIG. 6, the upper side of the cover recess 33 in the axial direction is a flat surface.
  • the cover recess 33 shown in FIG. 6 is formed by the radially inner side surface of the covering wall 32 and the radially outer surface of the cover convex portion 34. *
  • the cover convex part 34 extends axially downward on the radially inner side than the cover concave part 33. Specifically, the cover convex portion 34 extends in the longitudinal direction of the connector and further extends in the lateral direction from both ends in the longitudinal direction. In addition, a longitudinal direction refers to the left-right direction in FIG. 5, and a transversal direction refers to the up-down direction in FIG. As shown in FIG. 6, the lower side in the axial direction of the cover convex portion 34 is a flat surface. The lower surface of the cover convex portion 34 is located below the substrate 70. Further, the lower surface of the cover convex portion 34 is positioned at the same or lower side in the axial direction as the upper surface of the connector convex portion 215 described later. *
  • the cover step portion 35 is located on the radially inner side of the cover convex portion 34 and is recessed on the upper side in the axial direction.
  • step-difference part 35 are comprised by several flat surfaces, you may comprise by a curved surface.
  • the cover recess 33 is not formed on the inner surface of the covering wall 32, and is recessed upward in the axial direction with a space from the covering wall 32.
  • the protruding lengths of the covering wall 32 and the cover convex portion 34 in the axially lower side are substantially the same.
  • a step structure is provided between the covering wall 32 and the cover recess 33. *
  • the rotor 40 includes a shaft 41 and a rotor core 42.
  • the shaft 41 has a substantially cylindrical shape with a central axis A extending in the axial direction as a center.
  • the rotor core 42 is fixed to the shaft 41.
  • the rotor core 42 surrounds the radially outer side of the shaft.
  • the rotor core 42 rotates with the shaft 41.
  • the bearings 43 and 44 support the shaft 41 in a rotatable manner.
  • the bearing 43 disposed on the upper side in the axial direction is positioned on the upper side in the axial direction of the stator 50 and is held by the heat sink 100.
  • the bearing 44 disposed on the lower side in the axial direction is held on the bottom portion 14 of the housing 10. *
  • Stator 50 surrounds the radially outer side of the rotor 40.
  • Stator 50 includes a stator core 51, an insulator 52, a coil 53, a bus bar B, and a bus bar holding member 54.
  • the stator core 51 has a plurality of core backs and teeth 51b (see FIG. 10) arranged in the circumferential direction.
  • the core back has a cylindrical shape concentric with the central axis A.
  • the teeth 51b extend radially inward from the inner surface of the core back.
  • a plurality of teeth 51b are provided, extend in the radial direction from the core back, and are arranged with a gap (slot) therebetween in the circumferential direction.
  • the insulator 52 covers at least a part of the stator core 51.
  • the insulator 52 is formed of an insulator and is attached to each tooth 51b. *
  • the coil 53 is configured by exciting the stator core 51 and winding the coil wire C. Specifically, the coil wire C is wound around each tooth 51b via the insulator 52, and the coil 53 is disposed on each tooth 51b. That is, the coil wire C is concentrated winding. In the present embodiment, the coil wire C is so-called double arc winding in which concentrated winding is wound around two different teeth 51b. The coil wire C is located radially inward from the radially outer end of the bus bar holding member 54. *
  • the other end of the coil wire C is connected to the bus bar B.
  • the other end of the coil wire C is inserted into a coil support member 60 described later and connected to the substrate 70.
  • the other end of the coil wire C of this embodiment is a conducting wire drawn from the coil 53, and specifically, as shown in FIG. 10, the U phase, V phase, and W in the first and second systems.
  • Six lead wires 53U1, 53U2, 53V1, 53V2, 53W1, 53W2 constituting each of the phases.
  • Lead wires 53U1, 53U2, 53V1, 53V2, 53W1, 53W2 drawn from the stator 50 are inserted into through holes 65 (see FIG. 12) and heat sink through holes 110 (see FIG. 17) of the coil support member 60 described later. And electrically connected to the control unit by a method such as soldering. *
  • the lead wires 53U1, 53U2, 53V1, 53V2, 53W1, 53W2 are collected in a region of 180 degrees or less around the shaft by the crossover wire 53a. *
  • the motor 1 in the present embodiment has a two-system configuration including two sets of U-phase, V-phase, and W-phase, the number of systems can be arbitrarily designed. That is, the motor 1 may have a single system configuration or three or more systems.
  • the bus bar B is a member formed of a conductive material that electrically connects the coil wires led out from the coil 53 to each other.
  • the bus bar B in the present embodiment is a neutral point bus bar in star connection. *
  • the bus bar holding member 54 shown in FIG. The bus bar holding member 54 is made of an insulating material. As shown in FIG. 1, the bus bar holding member 54 is fixed to the outer side in the radial direction of the insulator 52 or the upper side in the axial direction of the core back. The bus bar holding member 54 and the bearing 43 overlap in the radial direction. *
  • the bus bar holding member 54 includes a ring-shaped base portion 55, a holding portion 56 that holds the bus bar B, and a bus bar convex portion 57.
  • the bus bar convex portion 57 and the holding portion 56 extend axially upward from a part of the base portion 55 and are provided at different positions in the circumferential direction.
  • the stator 50 has a stator fitting portion that is a convex portion or a concave portion extending in the axial direction.
  • the stator fitting portion is a bus bar convex portion 57 formed in the bus bar holding member and extending in the axial direction.
  • the stator fitting portion may be a recess (not shown) formed in the bus bar holding member 54 and recessed in the axially lower side.
  • the stator fitting portion may be a convex portion or a concave portion formed at the upper end of the stator core 51, the insulator 52, or the like. *
  • the coil support member 60 supports a conductive member such as a coil wire C.
  • the coil support member 60 is made of an insulating material.
  • the coil support member 60 is disposed on the upper side of the stator 50 in the axial direction, and the coil wire C is inserted therethrough.
  • the coil support member 60 includes a base portion 61 and a coil support portion 62 extending from the base portion 61 to the upper side in the axial direction.
  • the coil support member 60 of this embodiment includes a protrusion 62a through which the coil wire C is inserted.
  • the base 61 is located on the lower side in the axial direction than the protrusion 62a and extends in the radial direction.
  • the base 61 is disposed on the upper surface of the stator 50.
  • the stator fitting portion is formed on the bus bar holding member 54. Therefore, as shown in FIGS. 13 and 14, the base 61 is located on the upper surface of the bus bar holding member 54.
  • the base portion 61 is located on the upper surface of the stator core 51, and when the stator fitting portion is formed on the insulator 52, the base portion 61 is formed on the insulator 52. Located on the top surface. *
  • cuts 63 are formed on the lower side in the axial direction of the base 61 and at both ends in the circumferential direction.
  • the notches 63 are cut away from the lower surface toward the upper side in the axial direction at both ends in the circumferential direction.
  • the base portion 61 has a groove portion 64 formed at the upper end and extending in the radial direction.
  • the groove portion 64 is located on the upper side in the axial direction from the upper end surface of the housing 10.
  • the radially outer surface of the base 61 is formed by a plurality of surfaces. In the present embodiment, there are five radially outer surfaces of the base 61. Note that the radially outer surface of the base portion 61 may have a shape such as a curved surface. *
  • the coil support part 62 has a through hole 65 through which the coil wire is inserted.
  • the coil wires of the present embodiment are six lead wires 53U1, 53U2, 53V1, 53V2, 53W1, 53W2 constituting the U phase, V phase, and W phase in the first and second systems, respectively. Since one lead wire is held by one through hole 65, six coil support portions 62 having the through holes 65 are provided on the base portion 61.
  • the coil support part 62 which penetrates the coil wire of the same phase forms the projection part 62a adjacent not through a gap
  • the protrusions 62a exist for the U phase, the V phase, and the W phase, and the protrusions 62a are arranged in parallel at intervals. *
  • At least a part of the coil support portion 62 is located in a heat sink through hole 110 described later.
  • the width of the coil support portion 62 shown in FIG. 12 is equal to or gradually larger than the width of the heat sink through hole 110 from the upper side to the lower side in the axial direction.
  • the upper width of the coil support portion 62 is smaller than the lower width.
  • the coil support part 62 has a tapered shape toward the upper side. *
  • the coil support part 62 has a rib 66 extending in a direction intersecting the axial direction.
  • the protrusion 62a includes ribs extending on both sides in the circumferential direction of the protrusion 62a and ribs extending from the through holes 65 to both sides in the radial direction. That is, each protrusion 62 a has six ribs 66.
  • the width of the rib 66 is equal to or gradually smaller than the width of the heat sink through hole 110 from the lower side in the axial direction toward the upper side, and the width at the upper end is smaller than the width at the lower end. That is, the shape of the coil support part 62 having the rib 66 according to the present embodiment is tapered toward the upper side in the axial direction.
  • the protrusion 62a also has a shape that tapers upward in the axial direction. *
  • the base 61 is fitted to the stator 50 via a gap.
  • the base portion 61 and the stator 50 may be partially in contact with each other, but are preferably disposed with a gap in a direction perpendicular to the axial direction.
  • the direction perpendicular to the axial direction includes the radial direction and the circumferential direction. In the latter case, the entire coil support member 60 is movable with respect to the stator 50 when the motor 1 is assembled.
  • the base 61 and the stator 50 are disposed with a gap in the circumferential direction.
  • the base portion 61 has a coil support member fitting portion 67 that is a concave portion or a convex portion extending in the axial direction.
  • the stator fitting portion and the coil support member fitting portion 67 are fitted via a gap by the concave portion and the convex portion.
  • the radial width of the concave portion of the stator fitting portion or the coil support member fitting portion 67 is larger than the radial width of the convex portion of the coil support member fitting portion 67 or the stator fitting portion.
  • the circumferential width of the concave portion of the stator fitting portion or coil support member fitting portion 67 is larger than the circumferential width of the convex portion of the coil support member fitting portion 67 or stator fitting portion.
  • the stator fitting portion is a convex portion
  • the coil support member fitting portion 67 is a concave portion, and it is preferable that the stator fitting portion is fitted through a gap in the circumferential direction.
  • the stator 50 has a convex portion extending in the axial direction
  • the base portion 61 has a concave portion extending in the axial direction
  • the convex portion of the stator 50 and the concave portion of the base portion 61 are interposed via a gap in the circumferential direction.
  • the circumferential width of the concave portion of the base 61 is larger than the circumferential width of the convex portion of the stator 50.
  • the coil support member fitting portion 67 is a concave portion formed in the base portion 61, and the stator fitting portion is a bus bar convex portion 57 formed in the bus bar holding member 54.
  • the stator 50 and the coil support member 60 are fitted in an uneven shape, whereby the coil support member 60 is positioned at a predetermined position.
  • the position of the coil support member 60 can be adjusted by the width of the gap.
  • the heat sink 100 can be inserted while adjusting the position of the coil support member 60, the assemblability is facilitated.
  • the relationship between the projections and depressions may be reversed so as to satisfy the functions described above.
  • bus bar holding member 54 needs to be fixed as a part of the stator 50 because the bus bar and the coil lead wire need to be fixed by welding.
  • the coil support member 60 may move as long as the coil leader line can be positioned.
  • the coil support member fitting portion 67 is located between the adjacent coil support portions 62 in the base portion 61. In other words, the coil support member fitting portion 67 is located between the adjacent projecting portions 62 a in the base portion 61. The coil support member fitting portion 67 is located on the lower surface in the axial direction of the base portion 61 and extends along the circumferential direction (parallel direction).
  • the control unit controls the motor body having the rotor 40 and the stator 50.
  • the control unit includes a substrate 70 and an electronic component 80 mounted on the substrate 70.
  • the substrate 70 is disposed on the upper side in the axial direction of the stator 50 so as to spread in the radial direction.
  • the substrate 70 is fixed to the upper side of the heat sink 100 in the axial direction.
  • the electronic component 80 is mounted on at least one of the upper surface and the lower surface of the substrate 70.
  • the substrate 70 has a first region S1 where the power element is mounted and a second region S2 where the control element is mounted.
  • the first region S1 is a region of 180 degrees or more around the central axis A of the shaft 41 when viewed from the upper side in the axial direction.
  • the first region S1 and the second region S2 can be defined. Therefore, this is not the case when the power element and the control element are irregularly scattered on the substrate 70, or when the power element and the control element are arranged separately in the same circumferential direction and radial direction.
  • the first region S1 and the second region S2 are regions defined by an angle with the shaft 41 (center axis A) as the center. For example, even if the power element is biased radially inward of the substrate 70 in the first region S1, the radially outer side of the substrate 70 is regarded as the first region S1.
  • the power element is an element on the circuit that connects the coil wire to the external power source
  • the control element is an element on the circuit that connects the signal line detected by the magnetic sensor to the external control device.
  • the power element include a choke coil, an FET, and a capacitor.
  • a microcomputer etc. are mentioned as a control element. *
  • the substrate 70 has substrate through holes 71 and 72 through which the conductive member passes.
  • the conductive member is a member that is connected to the substrate 70 and distributes power, and is, for example, a connector pin 81 (see FIG. 1), a coil wire C wound around the stator 50, or the like.
  • the coil wire is inserted into the substrate through hole 71, and the connector pin 81 is inserted into the substrate through hole 72.
  • the coil wire C and the substrate 70, and the connector pin 81 and the substrate 70 are fixed by solder connection. *
  • the substrate 70 includes a printed circuit board 73 and lands 74 surrounding the substrate through hole 71 formed in the printed circuit board 73.
  • the lands 74 are located on the upper and lower surfaces of the printed circuit board 73 and the inner surface of the substrate through hole 71.
  • a positioning hole 76 corresponding to the second positioning recess 176 (see FIG. 17) of the heat sink 100 is formed in the substrate 70 for positioning with the heat sink 100.
  • the positioning hole 76 is a round hole, a notch hole, or the like.
  • a fixing hole 77 corresponding to the fixing hole 177 (see FIG. 17) of the heat sink main body 103 is formed in the substrate 70 for fixing to the heat sink 100.
  • the fixed hole 77 is a round hole, a notch hole, or the like.
  • the first positioning hole 178 passes through the heat sink upper surface 101 and the heat sink lower surface 102.
  • the second positioning recess 176 is formed with the first positioning hole 178 as a reference.
  • the first positioning recess 179 is formed with the first positioning hole 178 as a reference.
  • the positions of the first positioning recess 179 and the second positioning recess 176 are determined based on the first positioning hole 178.
  • the position of the connector 200 whose position is determined by the first positioning recess 179 and the board 70 whose position is determined by the second positioning recess 176 are determined. Thereby, the connector pin 81 can be easily connected without causing a positional shift between the heat sink 100 and the connector 200.
  • the substrate 70 or the electronic component 80 and the conductive member are connected by a connecting member 75.
  • the conductive members are a substrate 70 and a coil wire C.
  • the connection member 75 is a conductive adhesive, solder, or the like, and solder is used in this embodiment.
  • the solder is arranged so as to be continuous with the upper and lower surfaces of the substrate 70 and the inside of the substrate through hole 71 through which the conductive member passes. All of the solder is located on the upper side in the axial direction from an exposed surface 122 (see FIG. 1) of the heat sink 100 described later. *
  • the heat sink 100 is arranged on the upper side in the axial direction of the stator 50 and faces the substrate 70 in the axial direction.
  • the heat sink 100 has a function of absorbing heat from the electronic component 80 mounted on the substrate 70 and releasing it to the outside, and is formed of a material with low thermal resistance.
  • the heat sink 100 holds the bearing 43, it is also used as a bearing holder.
  • the bearing holder and the heat sink are integrated, the number of parts, the number of assembly points, and the costs associated therewith can be reduced.
  • heat resistance generated when the bearing holder and the heat sink are separated can be suppressed, heat can be easily transmitted to the outside.
  • the heat sink 100 has a heat sink upper surface 101 shown in FIG. 17 and a heat sink lower surface 102 shown in FIG.
  • the heat sink upper surface 101 faces the substrate 70, and the heat sink lower surface 102 faces the stator 50.
  • the heat sink 100 includes a heat sink body 103 and a heat sink protrusion that is continuous with the heat sink body 103 and extends radially outward from the housing 10. 104. *
  • the heat sink main body 103 overlaps the housing 10 that houses the rotor 40 and the stator 50 when viewed from the upper side in the axial direction.
  • the heat sink protrusion 104 protrudes in the radial direction from the heat sink main body 103 and covers at least a part of the connector 200 in the longitudinal direction (the left-right direction in FIGS. 17 and 18). *
  • a plurality of heat sink protrusions 104 shown in FIGS. 17 and 18 are formed at intervals. Specifically, the heat sink protrusion 104 protrudes from one end and the other end of the radially outer end edge on the connector 200 side of the heat sink main body 103.
  • the right end of the heat sink main body 103 is the “radial outer edge”, and the upper end and the lower end are “one end and the lower end”.
  • the shape of the heat sink protrusion 104 is a shape protruding in a bar shape in plan view as shown in FIG. 19A, and when it is installed only at both ends, it forms a substantially U shape with the heat sink main body 103. Further, the shape of the heat sink protrusion 104 may be a shape protruding in a plate shape as shown in FIG. 19B, or a ring shape as shown in FIG. 19C. In addition, when the heat sink protrusion 104 has a shape protruding in a rod shape in a plan view, the heat sink protrusion 104 may be one, may be three or more, and is not provided at both ends. May be. *
  • the heat sink protrusion 104 has a heat sink recess or a heat sink protrusion extending in the axial direction in order to fit with a connector 200 described later. Further, the heat sink concave portion or the heat sink convex portion extends along the axial direction. 17 and 18, a heat sink recess 105 is formed on the inner surface of the heat sink protrusion 104 located at one end and the other end of the connector 200 in the longitudinal direction. The inner side surface of the heat sink protrusion 104 is a surface facing the connector 200. *
  • the heat sink protrusion 104 is an exposed surface 122 (see FIG. 1). That is, a gap is provided between the heat sink protrusion 104 and the substrate 70. Therefore, it is possible to visually check whether the connector pins 81 are connected to the board 70 from the longitudinal direction of the connector 200 in the previous process of attaching the cover 30. *
  • the heat sink 100 is formed with a cavity H passing through the conductive member and extending in the axial direction.
  • the cavity H is a through hole, a notch or the like.
  • the hollow portion H for passing the conductive member in the structure shown in FIGS. 17 and 18 and FIG. 19A schematically showing them includes the heat sink main body 103 and two heat sink protrusions. And part 104. Specifically, the cavity H is formed by a radially outer end edge on the connector side of the heat sink main body 103 and the two heat sink protrusions 104.
  • the notch forms a cavity H.
  • a hollow hole having a ring shape forms the cavity H.
  • a heat sink through-hole 110 is formed as the hollow portion H through the coil wire and extending in the axial direction.
  • the cavity H of the heat sink 100 shown in FIGS. 17 and 18 is a conductive member from the connector formed by the radially outer end surface of the heat sink body 103 and the inner end surfaces of the two heat sink protrusions 104. And a heat sink through-hole 110 for the coil wire.
  • the heat sink through hole 110 passes through a conductive member such as a coil wire and extends in the axial direction. For this reason, the heat sink through-hole 110 can position the conductive member. As shown in FIGS. 1 and 20, the heat sink through hole 110 of the present embodiment holds a coil support member 60 that supports a coil wire.
  • a plurality of heat sink through-holes 110 are located adjacent to each other in the circumferential direction. Specifically, the plurality of heat sink through holes 110U, 110V, and 110W are provided at intervals in the circumferential direction. That is, the plurality of heat sink through-holes 110U, 110V, 110W are aligned on a concentric arc at intervals. *
  • the plurality of heat sink through-holes 110U, 110V, 110W are located in a region where the central angle ⁇ around the shaft 41 (center axis A) is within 180 degrees when viewed from the upper side in the axial direction. To do. That is, the heat sink through holes 110U, 110V, and 110W are gathered and arranged on one side.
  • the number of slots is 6 or more
  • the number of phases is 3
  • the central angle ⁇ is preferably “(360 degrees / number of slots) ⁇ 3” degrees or less.
  • the “phase” in the above formula is the number of independent coils of the fixed stator, and is a motor having three independent coils at 120 ° intervals from the three-phase motor having three phases. Then, it is a three-phase motor of U phase, V phase, and W phase.
  • the “slot” in the above formula represents the number of grooves between the teeth, and is a multiple of 3 for a three-phase motor. In the present embodiment, since there are 12 slots of 3 phases, the central angle ⁇ is preferably 90 degrees or less. *
  • the coil lead wires 53U1, 53U2, 53V1, 53V2, 53W1, 53W2 are desirably arranged so as to be located within the central angle ⁇ .
  • the crossover wire 53a By using the crossover wire 53a, the coil leader can be positioned within the central angle ⁇ .
  • only a plurality of in-phase coil wires are inserted through the plurality of heat sink through holes 110U, 110V, 110W. That is, one protrusion 62a of the coil support member 60 is held in each of the heat sink through holes 110U, 110V, and 110W.
  • the plurality of heat sink through holes 110U, 110V, and 110W are holes separated from each other for each phase of the coil wire. That is, the plurality of heat sink through holes 110U, 110V, and 110W are independent from each other and are not connected. Specifically, only the lead wires 53U1 and 53U2 that are two U-phase coils are inserted into the heat sink through hole 110U.
  • heat sink through holes 110U, 110V, and 110W face the first region S1 on the substrate 70 where the power elements are mounted. For this reason, heat sink through-holes 110U, 110V, and 110W through which the coil wires pass are formed in the first region S1 where the power element of the substrate 70 is mounted.
  • the heat sink through holes 110U, 110V, and 110W may have a structure that spans the first region S1 in which the power element is mounted and the second region S2 in which the control element is mounted. Moreover, when viewed from the upper side in the axial direction, a structure in which a part of the heat sink through hole is the first region S1 and the remaining part is the second region S2 may be used.
  • the heat sink 100 is located at the upper end portion of the heat sink through hole 110, and the bottom surface (recessed bottom surface 113) is exposed from the upper side in the axial direction.
  • a recess 111 is provided. That is, the recess 111 provided at the upper end of the heat sink through hole 110 is a countersink-shaped recess formed by countersinking.
  • the recess bottom surface 113 is a surface located on the lower side in the axial direction of the recess 111. *
  • the recess 111 is provided on the radially inner side with respect to the heat sink through hole 110. Note that the recess 111 only needs to be positioned at the upper end portion of at least a part of the heat sink through-hole 110, and may be provided radially outside the heat sink through-hole 110. *
  • the recess 111 includes a heat sink upper surface 101, a recess side surface 112 extending downward from the heat sink upper surface 101, and a recess bottom surface 113 continuous with the lower end of the recess side surface 112.
  • the heat sink upper surface 101 and the recess bottom surface 113 are parallel.
  • the through-hole side surface 110a and the recessed part side surface 112 of the heat sink through-hole 110 are parallel.
  • the through-hole side surface 110a is a surface extending downward from the recess bottom surface 113 in the heat sink through-hole 110.
  • the crossing angle D1 between the through-hole side surface 110a and the recess bottom surface 113 is 90 degrees or less.
  • the intersection angle D2 between the concave side surface 112 and the concave bottom surface 113 is 90 degrees or less.
  • the intersection angle D2 between the recess side surface 112 and the recess bottom surface 113 is 90 degrees or less.
  • connection member 75 that connects the coil wire C and the substrate 70 is located in at least a part of the recess 111.
  • the connecting member 75 is solder, a back fillet is generated when soldering is performed. Therefore, the recessed part 111 plays the role of escape of a back fillet.
  • the coil support member 60 is inserted into the heat sink through hole 110.
  • the axial positions of the upper surface 60 a of the coil support member 60 and the recess bottom surface 113 are different.
  • the upper surface 60 a of the coil support member 60 is located on the lower side in the axial direction than the recess bottom surface 113.
  • the upper surface 60 a of the coil support member 60 is positioned on the upper side in the axial direction than the recess bottom surface 113.
  • the upper end portion of the coil support member 60 has a tapered portion 60b whose width becomes narrower toward the upper side in the axial direction.
  • a space serving as a pocket for housing the heat dissipation member 123 can be formed by the side surface of the tapered portion 60 b of the coil support member 60 and the side surface 110 a of the through hole.
  • a space serving as a pocket for accommodating the heat dissipation member 123 can be formed by the side surface of the tapered portion 60 b of the coil support member 60 and the recess 111.
  • the “space serving as a pocket” refers to a space where the upper surface is open and the lower surface is closed.
  • the “space to be a pocket” does not have to have a bottomed shape, and a gap may be left on the side surface.
  • the lower end 60b1 of the tapered portion 60b is located on the lower side in the axial direction than the concave bottom surface 113.
  • a space serving as a pocket for accommodating the heat dissipation member 123 can be formed by the side surface of the tapered portion 60b positioned on the lower side in the axial direction than the bottom surface 113 of the recess and the side surface 110a of the through hole.
  • the upper end (the upper surface 60 a in the present embodiment) of the tapered portion 60 b is positioned on the upper side in the axial direction than the concave bottom surface 113.
  • a space serving as a pocket for accommodating the heat radiating member 123 can be formed by the side surface of the tapered portion 60 b positioned on the upper side in the axial direction from the concave bottom surface 113 and the concave portion 111.
  • the base 61 of the coil support member 60 overlaps the heat sink through hole 110 when viewed from the axial direction. That is, the base 61 having a width larger than the width of the heat sink through hole 110 is positioned below the heat sink through hole 110.
  • the gap and the base 61 overlap. For this reason, the space which becomes the pocket which accommodates the heat radiating member 123 can be formed by the gap and the base 61.
  • the through hole side surface 11 a located on the lower side in the axial direction of the recess 111 and the coil support member 60 are close to each other, and the through hole side surface 111 a and the coil support member 60 are in contact with each other. It is preferable. *
  • the width of the upper end of the coil support portion 62 is smaller than the width of the lower end of the heat sink through hole 110, and the width of the coil support portion 62 is directed from the upper side to the lower side in the axial direction. Gradually become equal or larger. More specifically, the heat sink through-hole 110 has a constant width and has a tapered shape in which the side surface of the coil support portion 62 extends downward. *
  • the width of the lower end of the heat sink through hole 110 is larger than the width of the upper end of the coil support portion 62, and the width of the heat sink through hole 110 is gradually equal from the lower side in the axial direction toward the upper side. Or get smaller. More specifically, the heat sink through hole 110 has a tapered shape that spreads downward, and the side surface of the coil support portion 62 has a constant width.
  • the width of the upper end of the heat sink through hole 110 is larger than the width of the coil support portion 62, but the width of the upper end of the heat sink through hole 110 is smaller than the width of the coil support portion 62. Good. *
  • the gap between the coil support portion 62 and the heat sink through hole 110 becomes the same or larger as it goes from the lower side to the upper side. Therefore, when the motor 1 is assembled, the heat sink through hole 110 is moved from the upper side of the coil support member 60. Easy to insert. *
  • the groove portion 64 (see FIG. 12) of the coil support member 60 allows easy positioning when the heat sink 100 is inserted from above the coil support member 60. The reason is as follows. As shown in FIG. 28, when the heat sink 100 is inserted into the coil support member 60 from the upper side in the axial direction as indicated by an arrow M with the pin P inserted in the vicinity of the groove 64 on the upper end surface of the base 61, the heat sink 100 is Since the pin P is pressed, the pin P moves to the groove portion 64. Since the coil support member 60 moves according to the arrow N in response to the pressing of the pin P, the heat sink 100 and the coil support member 60 can be positioned. The coil support 62 is inserted into the heat sink through hole 110, and the position is determined. Since the groove 64 is positioned on the upper side in the axial direction from the upper end surface of the housing 10, the inserted pin P can be easily removed. *
  • the heat sink 100 includes a contact surface 121 and an exposed surface 122.
  • the contact surface 121 and the exposed surface 122 are surfaces located on the upper surface of the heat sink 100 shown in FIG. *
  • the contact surface 121 is in contact with the substrate 70 or the electronic component 80 directly or through the heat dissipation member 123.
  • the heat radiating member 123 is a member having heat radiating properties such as grease.
  • the heat dissipation member 123 is in contact with the heat sink 100 and the substrate 70.
  • the exposed surface 122 is exposed without being in contact with the substrate 70, the electronic component 80, and the heat dissipation member. In other words, the exposed surface 122 is disposed with a gap from the substrate 70 or the electronic component 80. That is, the contact surface 121 is in direct or indirect contact with the substrate 70 or the electronic component 80, and the exposed surface 122 has no member in direct or indirect contact.
  • the exposed surface 122 is located on the outer edge side of the cavity H (in FIG. 17, the heat sink through hole 110).
  • the exposed surface 122 is located radially outside the heat sink through-hole 110.
  • the boundary between the contact surface 121 and the exposed surface 122 is located in the circumferential direction.
  • the boundary between the contact surface 121 and the exposed surface 122 is an arc of a central angle ⁇ connecting the heat sink through hole 110U located at one end, the heat sink through hole 110W located at the other end, and the central axis A. Located in. *
  • the connection between the substrate 70 or the electronic component 80 and the conductive member can be visually confirmed.
  • FIG. 29 schematically illustrates the relationship between the vicinity of the boundary between the exposed surface 122 and the contact surface 121 and the substrate 70.
  • the substrate 70 may have a plate shape that extends flatly, and the exposed surface 122 may be positioned below the contact surface 121.
  • the substrate 70 may have a step structure, and the exposed surface 122 and the contact surface 121 may be located on the same plane.
  • the contact surface 121 may include a first contact surface that is in direct contact with the substrate 70 or the electronic component 80, and a second contact surface that is in contact with the substrate 70 or the electronic component 80 via the heat dissipation member 123.
  • the substrate is more than the gap between the substrate 70 or the electronic component 80 and the second contact surface.
  • 70 or the electronic component 80 and the gap between the exposed surface 122 are preferably increased.
  • the substrate 70 or the electronic component 80 and the exposed surface It is preferable to increase the gap with 122.
  • the coil support member 60 is displaced upward, it is difficult to see the lower end portion of the connection member.
  • the dimension L1 between the exposed surface 122 of the heat sink 100 and the lower surface of the substrate 70 (or electronic component) is from the substrate through hole 71 to the outer end of the land 74. It is larger than the dimension L2.
  • the angle ⁇ formed between the outer end of the land 74, the imaginary line T connecting the coil wire C and the exposed position of the exposed surface 122, and the exposed surface 122 is 45 degrees or more.
  • the tip of the member that supports the conductive member (the coil support member 60 in this embodiment) is located at the same or lower side in the axial direction as the exposed surface, The lower end can be confirmed more easily.
  • the connection member that connects the substrate 70 or the electronic component 80 and the conductive member is the heat sink 100. Can be further prevented from conducting.
  • the heat sink 100 is formed on the inner region 130, the outer region 140 located radially outside the inner region 130, and on the radially outer side of the outer region 140.
  • An outer wall 150 is formed on the inner region 130, the outer region 140 located radially outside the inner region 130, and on the radially outer side of the outer region 140.
  • the inner region 130 at least partially overlaps the electronic component 80 in the axial direction.
  • the axial thickness of the inner region 130 is greater than the axial thickness of the outer region 140.
  • the heat sink through holes 110U, 110V, and 110W are located in the radially outer region of the substrate 70, electronic components are concentrated in the radially inner region of the substrate 70. Therefore, by increasing the axial thickness of the inner region 130 of the heat sink 100, the heat of the electronic component can be released to the heat sink 100. Furthermore, the space which accommodates components can be ensured by making the thickness of the outer side area
  • the inner region 130 includes an inner wall portion 131 and a rib 132.
  • the inner wall portion 131 and the rib 132 are formed on the heat sink lower surface 102.
  • the inner wall 131 extends in the axially lower side at the radially inner end.
  • the rib 132 extends radially outward from the inner wall portion 131.
  • a plurality of ribs 132 are provided, and each of the plurality of ribs 132 is arranged at equal intervals in the circumferential direction.
  • the plurality of ribs 132 extend radially in the radial direction about the central axis A.
  • the rigidity of the inner region 130 of the heat sink 100 can be increased by the inner wall portion 131 and the rib 132, when the heat sink 100 holds the bearing 43, durability against stress for supporting the shaft 41 can be improved. Further, by extending the rib 132 in the radial direction, the heat capacity of the heat sink 100 can be increased, and heat can be easily transferred to the outside in the radial direction.
  • the outer region 140 has heat sink through holes 110U, 110V, 110W through which the coil wire C described above is inserted.
  • the lower surface of the outer region 140 is positioned above the lower surface of the inner region 130 in the axial direction.
  • the bus bar holding member 54 is positioned below the outer region 140 in the axial direction and overlaps the inner region 130 in the radial direction.
  • a concave portion recessed in the axial direction upper side is provided, and the bus bar B is accommodated in the concave portion.
  • a large number of heat generating elements are arranged in the central portion (radially inside) of the substrate 70. For this reason, the heat dissipation effect is enhanced by increasing the thickness of the inner region 130 located at the center of the heat sink 100 facing the substrate 70.
  • the coil wire C drawn from the coil 53 of the stator 50 is connected to the outside (radially outside) of the substrate 70, and no heating element is arranged.
  • the height in the axial direction can be suppressed.
  • the heat sink 100 covers the top and side surfaces of the bus bar, so that the heat sink 100 can absorb the radiant heat of the bus bar during driving.
  • the outer side wall 150 surrounds the outer side in the radial direction of the bus bar holding member 54.
  • the axial thickness of the outer wall portion 150 is larger than the axial thickness of the inner region 130. At least a part of the outer wall 150 is exposed to the outside. Since the outer wall part 150 includes a portion having the largest axial thickness in the heat sink 100, the heat dissipation effect can be further enhanced.
  • a second positioning recess 176 is formed on the heat sink upper surface 101 of the heat sink body 103 for positioning with the substrate 70.
  • a plurality of second positioning recesses 176 are formed and are circular recesses.
  • a positioning member such as a positioning pin is inserted into the second positioning recess 176 of the heat sink 100 and the positioning hole 76 (see FIG. 15) of the substrate 70 for positioning.
  • a fixing hole 177 is formed in the heat sink main body 103 for fixing to the substrate 70.
  • the fixed hole portion 177 is a substrate contact portion that contacts the substrate 70 in the axial direction.
  • a plurality of fixed hole portions 177 are formed and are circular hole portions.
  • a fixing member such as a fixing pin or a screw is inserted into the fixing hole portion 177 of the heat sink 100 and the fixing hole portion 77 (see FIG. 15) of the substrate to fix the substrate 70 and the heat sink 100.
  • the positions of the heat sink 100 and the substrate 70 are determined using the positioning member, and are fixed by the fixing member. After the substrate 70 and the heat sink 100 are fixed, the positioning member is removed. *
  • the fixing hole 177 protrudes upward in the axial direction with respect to the exposed surface 122. That is, in the present embodiment, the fixing hole 177 is located on the first contact surface.
  • the plurality of heat sink through-holes 110 and the fixed hole portions 177 are provided at intervals in the circumferential direction.
  • the two fixing hole portions 177 are provided at intervals in the circumferential direction with respect to the heat sink through holes 110U and 110W located at both ends of the plurality of heat sink through holes 110 in the circumferential direction.
  • the heat sink protrusion 104 has a first positioning hole 178 and a first positioning recess 179 or a first positioning protrusion for positioning with the connector 200. A portion (not shown) is formed.
  • the first positioning recess is a notch recess.
  • the connector 200 is disposed adjacent to the housing 10 and electrically connects the substrate 70 and the outside of the motor 1.
  • the connector 200 of the present embodiment is disposed outside the housing 10 in the radial direction, extends downward (in a downward direction) in the axial direction, and includes a connector pin 81 that is a conductive member extending downward in the axial direction from the board 70. To house. *
  • the upper surface of the connector 200 is positioned below the heat sink upper surface 101 of the heat sink 100, and the connector 200 and the substrate 70 overlap when viewed from the upper side in the axial direction.
  • the connector 200 includes a connector body portion 210 extending in the axial direction, a connector flange portion 220 extending radially outward from the outer surface of the connector body portion 210, and a connector. And a connector protrusion 230 extending axially upward from the upper surface of the body portion 210.
  • the connector body part 210 is formed on the outer surface and has a body convex part 211 or a body concave part (not shown) extending in the axial direction.
  • the trunk protrusion 211 extends in the axial direction from the connector flange 220 to the connector protrusion 230.
  • the connector body portion 210 further includes a connector convex portion 215 formed in the radially outer end region and extending in the axial direction.
  • the connector convex portion 215 is an outer edge portion including a connector outer end edge 216 on the radially outer side.
  • the connector outer edge 216 is an outer end (an end of the connector 200).
  • the connector body 210 further has a pocket recess 217 formed on the radially inner side of the connector protrusion 215 and the radially inner surface of the connector protrusion 215.
  • the pocket recess 217 stores dust that enters from the outside.
  • the connector flange portion 220 is formed at the central portion of the connector body portion 210 in the axial direction.
  • the central part is a predetermined range from the center (for example, within 1/3 from the center of the axial height). Thereby, even if the connector 200 receives external force, durability can be improved.
  • a fitting portion 221 for positioning with the heat sink 100 is formed on the upper surface of the connector flange portion 220.
  • the fitting portion 221 is fitted into each of the first positioning hole 178 and the first positioning concave portion 179 or the first positioning convex portion (not shown).
  • the fitting part 221 of the present embodiment is a protruding part that extends upward. *
  • the connector protrusion 230 extends upward from the upper surface of the connector body 210.
  • the connector protrusion 230 may be integrally formed with the connector body 210 or may be a separate member. *
  • the connector convex portion 215 and the cover concave portion 33 are fitted via a gap.
  • the connector 200 is substantially rectangular in plan view.
  • the connector protrusion 215 and the cover recess 33 extend along the longitudinal direction of the connector 200.
  • the connector protrusion 230 and the cover step 35 are fitted via a gap.
  • a corner portion on the outer side in the radial direction of the connector protrusion 230 and the step portion of the cover step portion 35 are opposed to each other.
  • the connector convex portion 215 is not constituted by the connector outer end edge 216, and extends axially upward from a position spaced from the connector outer end edge 216 in the radial direction.
  • the fitting between the connector convex portion 215 and the cover concave portion 33 through the gap is located in the outer end region R that does not include the cover outer end edge 31 and the connector outer end edge 216.
  • the connector 200 further includes a step portion 218 that extends radially inward from the upper end of the radially inner side surface of the pocket recess 217.
  • the connector convex portion 215 and the cover concave portion 33 are fitted via a gap, and the concave portion 219 including the pocket concave portion 217 and the stepped portion 218 and the cover convex portion 34 are fitted via the gap.
  • the connector 200 has a pocket recess 217 formed on the radially outer side of the connector protrusion 215 and the radially outer surface of the connector protrusion 215.
  • a part of the cover concave portion 33 faces the pocket concave portion 217, and the remaining portion of the cover concave portion 33 is fitted to the connector convex portion 215 via a gap.
  • the fitting between the connector convex portion 215 and the cover concave portion 33 through the gap is located in the outer end region R not including the cover outer end edge 31 and the connector outer end edge 216.
  • the motor 1 of the present embodiment has a labyrinth structure in which the cover 30 and the connector 200 are fitted with each other in a concavo-convex shape through a gap. For this reason, while having a dustproof effect, a motor can be assembled easily.
  • the connector 200 contacts the lower surface of the heat sink protrusion 104.
  • the heat sink protrusion 104 is disposed on the connector flange 220 so that the flange upper surface 222 of the connector flange 220 and the heat sink lower surface 102 of the heat sink protrusion 104 are in contact with each other.
  • FIG. 17 when a plurality of heat sink protrusions 104 are formed at intervals, the connector flange portion 220 comes into contact with each of the lower surfaces of the plurality of heat sink protrusions 104.
  • the connector flange portion 220 may include a member such as a metal collar located at the upper end. When the connector flange portion 220 includes a metal collar, the metal collar contacts the lower surface of the heat sink protrusion 104. *
  • the body convex portion 211 and the heat sink concave portion 105 are fitted through a gap.
  • a trunk recess may be formed instead of the trunk protrusion 211
  • a heat sink protrusion may be formed instead of the heat sink recess
  • the trunk recess and the heat sink protrusion may be fitted via a gap.
  • trunk convex part or trunk concave part and the heat sink concave part or the heat sink convex part that are fitted to each other via a gap extend along the axial direction.
  • the cover 30 and the connector 200 have been described by way of example of the structure in which the cover 30 and the connector 200 are fixed to the heat sink 100.
  • the heat sink and the connector may be fixed to the cover.
  • an easily assembled structure can be realized by adopting a structure in which the heat sink and the connector are fitted via a gap.
  • the heat sink 100 of the present embodiment has been described by taking as an example a configuration that also serves as a holder that holds the coil support member 60 inserted through the heat sink through hole 110.
  • the heat sink of the present invention may not have a function of holding the coil support member as long as the heat sink has a through hole through which the coil support member is inserted.
  • the motor according to the first embodiment of the present invention includes a rotor including a shaft extending in the axial direction, and a coil that surrounds the outer side in the radial direction of the rotor and is formed by winding a coil wire.
  • a stator a coil support member that is arranged on the upper side in the axial direction of the stator and through which the coil wire is inserted, and is formed of an insulating material;
  • a heat sink having a heat sink, and a substrate on which an electronic component is mounted, which is disposed on the upper side in the axial direction of the heat sink.
  • the axial position of the upper surface of the coil support member and the bottom surface of the recess is different.
  • the recess can form a gap between the connection member that connects the coil wire and the substrate and the heat sink, so that the connection member and the heat sink can be insulated.
  • the recess is formed at the upper end, the capacity reduction of the heat sink can be suppressed, so that the heat dissipation of the electronic component can be maintained.
  • the heat sink can be designed with a reduced axial height in a state where insulation from the connection member is ensured and a region for heat dissipation is secured.
  • the lower surface of the through hole is divided into two steps: the coil support member and the recess. It is possible to prevent the heat dissipation member from moving toward the side. Since the stator is disposed on the lower side of the through hole in the axial direction, it is possible to prevent the heat dissipation member from entering the stator. *
  • the motor according to the first embodiment of the present invention can reduce the dimension in the axial direction and prevent the heat dissipation member from entering the stator.
  • the coil support member includes a protrusion portion through which the coil wire is inserted, and a base portion that is located on the lower side in the axial direction than the protrusion portion and extends in the radial direction.
  • the base portion at least partially overlaps the through hole when viewed from the axial direction.
  • the upper surface of the coil support member is positioned above the bottom surface of the recess in the axial direction.
  • a heat radiating member plays the role of the pocket which accommodates a heat radiating member by the side surface of the coil support member in a recessed part, and the side surface and bottom face of a recessed part. Therefore, it is possible to further prevent the heat dissipation member from entering the stator.
  • the concave portion includes a heat sink upper surface, a side surface extending downward from the heat sink upper surface, and a bottom surface continuous with the lower end of the side surface, and an intersection angle between the side surface and the bottom surface of the through hole is It is 90 degrees or less.
  • the crossing angle between the side surface of the through hole and the bottom surface of the recess is 90 degrees or less, even if the heat dissipation member enters the through hole, the heat dissipation member can be easily accommodated in the recess. Therefore, it is possible to further prevent the heat dissipation member from entering the stator.
  • the recess includes a heat sink upper surface, a side surface extending downward from the heat sink upper surface, and a bottom surface continuous with a lower end of the side surface, and the heat sink upper surface and the bottom surface are parallel to each other. . *
  • the upper end portion of the coil support member has a tapered portion whose width becomes narrower toward the upper side in the axial direction.
  • a space serving as a pocket for accommodating the heat radiating member can be formed by the side surface of the tapered portion of the coil support member and the side surface or recess of the through hole. Therefore, it is possible to further prevent the heat dissipation member from entering the stator.
  • the lower end of the tapered portion is positioned on the lower side in the axial direction than the bottom surface of the recess.
  • the space used as the pocket which accommodates a thermal radiation member can be formed with the side surface of the taper-shaped part located in the axial direction lower side from the bottom face of a recessed part, and the side surface of a through-hole. Therefore, it is possible to more effectively prevent the heat dissipation member from entering the stator.
  • the upper end of the tapered portion is positioned on the upper side in the axial direction from the bottom surface of the recess.
  • the space used as the pocket which accommodates a thermal radiation member can be formed by the side surface of the taper-shaped part located in the axial direction upper side rather than the bottom face of a recessed part, and a recessed part. Therefore, it is possible to effectively prevent the heat dissipation member from entering the stator.
  • Embodiment 2 With reference to FIG. 33, one Embodiment of the apparatus provided with the motor 1 of Embodiment 1 is described. In the second embodiment, an example in which the motor 1 is mounted on an electric power steering apparatus will be described. *
  • the electric power steering device 2 is mounted on a steering mechanism of a vehicle wheel.
  • the electric power steering device 2 of the present embodiment is a column type power steering device that directly reduces the steering force by the power of the motor 1.
  • the electric power steering device 2 includes a motor 1, a steering shaft 914, and an axle 913. *
  • the steering shaft 914 transmits the input from the steering 911 to the axle 913 having the wheels 912.
  • the power of the motor 1 is transmitted to the axle 913 via a ball screw.
  • the motor 1 employed in the column-type electric power steering device 2 is provided inside an engine room (not shown). In the case of a column-type power steering device, since a waterproof structure can be provided in the engine room itself, it is not necessary to provide a waterproof structure in the motor itself. On the other hand, although dust may enter the engine room, since the motor 1 has a dustproof structure, it is possible to suppress dust from entering the motor body. *
  • the electric power steering apparatus 2 according to the second embodiment includes the motor 1 according to the first embodiment. For this reason, the electric power steering device 2 having the same effect as the first embodiment can be obtained. That is, since the electric power steering apparatus 2 according to the second embodiment includes the motor according to the first embodiment, the axial dimension can be reduced and the heat dissipation member can be prevented from entering the stator. *
  • the electric power steering apparatus 2 was mentioned here as an example of the usage method of the motor 1 of Embodiment 1, the usage method of the motor 1 is not limited and can be used widely, such as a pump and a compressor. *

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

L'invention concerne un moteur et un dispositif de direction assistée électrique ayant des dimensions réduites dans la direction axiale. Ce moteur (1) est pourvu des éléments suivants : un élément de support de bobine (60) dans lequel un fil de bobine (C) est inséré, et qui est constitué d'un matériau isolant ; et un dissipateur thermique (100) ayant un trou traversant dans lequel l'élément de support de bobine (60) est inséré. Le dissipateur thermique (100) est pourvu d'un évidement (111) qui est situé à l'extrémité supérieure du trou traversant, et qui expose la surface inférieure telle qu'elle est vue depuis le dessus dans la direction axiale. La surface supérieure de l'élément de support de bobine (60) et la surface inférieure de l'évidement (111) diffèrent l'une de l'autre dans une position de direction axiale.
PCT/JP2018/018492 2017-05-17 2018-05-14 Moteur et dispositif de direction assistée électrique Ceased WO2018212123A1 (fr)

Priority Applications (2)

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CN202111079543.3A CN113612333B (zh) 2017-05-17 2018-05-14 马达和电动助力转向装置
CN201880032106.6A CN110622396B (zh) 2017-05-17 2018-05-14 马达和电动助力转向装置

Applications Claiming Priority (2)

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JP2017-098499 2017-05-17
JP2017098499 2017-05-17

Publications (1)

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WO2018212123A1 true WO2018212123A1 (fr) 2018-11-22

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JP2004015977A (ja) * 2002-06-11 2004-01-15 Denso Trim Kk 磁石式発電機
JP2009207274A (ja) * 2008-02-27 2009-09-10 Mitsubishi Electric Corp 車両用交流発電機
JP2014093880A (ja) * 2012-11-05 2014-05-19 Denso Corp 回転電機
JP2015144507A (ja) * 2014-01-31 2015-08-06 株式会社デンソー 駆動装置
JP2016036241A (ja) * 2014-08-01 2016-03-17 日本電産テクノモータ株式会社 モータ
JP2016119799A (ja) * 2014-12-22 2016-06-30 株式会社デンソー 駆動装置、および、これを用いた電動パワーステアリング装置

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WO2021193040A1 (fr) * 2020-03-25 2021-09-30 日本電産株式会社 Moteur
JPWO2021193040A1 (fr) * 2020-03-25 2021-09-30
CN115349214A (zh) * 2020-03-25 2022-11-15 日本电产株式会社 马达
US12126235B2 (en) 2020-03-25 2024-10-22 Nidec Corporation Motor

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CN110622396A (zh) 2019-12-27
CN110622396B (zh) 2021-10-12
CN113612333B (zh) 2024-04-23
CN113612333A (zh) 2021-11-05

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