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WO2017221399A1 - Stator, moteur électrique, compresseur, aspirateur et procédé de fabrication de stator - Google Patents

Stator, moteur électrique, compresseur, aspirateur et procédé de fabrication de stator Download PDF

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Publication number
WO2017221399A1
WO2017221399A1 PCT/JP2016/068809 JP2016068809W WO2017221399A1 WO 2017221399 A1 WO2017221399 A1 WO 2017221399A1 JP 2016068809 W JP2016068809 W JP 2016068809W WO 2017221399 A1 WO2017221399 A1 WO 2017221399A1
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WO
WIPO (PCT)
Prior art keywords
yoke
teeth
axis
amorphous alloy
alloy ribbon
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/JP2016/068809
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English (en)
Japanese (ja)
Inventor
直弘 桶谷
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2018523249A priority Critical patent/JP6632722B2/ja
Priority to PCT/JP2016/068809 priority patent/WO2017221399A1/fr
Publication of WO2017221399A1 publication Critical patent/WO2017221399A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/08—Salient poles

Definitions

  • the present invention relates to a stator, an electric motor, a compressor, a vacuum cleaner, and a stator manufacturing method.
  • stator cores composed of amorphous alloy ribbons have been developed. Since the amorphous alloy ribbon has a thickness of 1/10 or less than that of the electromagnetic steel sheet, it is difficult to perform punching like the electromagnetic steel sheet. Therefore, for example, in the technique disclosed in Patent Document 1, a tape-shaped amorphous alloy ribbon is wound around a winding frame and laminated, and a part of the tape is cut to form a U-shaped block, and a plurality of U-shaped blocks are formed.
  • the stator core is formed by arranging the blocks in a ring shape.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric motor that can improve motor efficiency by using an amorphous alloy ribbon.
  • the stator of the present invention includes a yoke extending in the circumferential direction around the axis, and teeth extending in the radial direction around the axis from the yoke toward the axis.
  • the teeth have an axial end portion and a yoke base portion.
  • the teeth are composed of an amorphous alloy ribbon.
  • the amorphous alloy ribbon has a shape bent at the tip portion and the root portion so that a plurality of sections extending in the radial direction between the tip portion and the root portion are arranged in the circumferential direction.
  • the teeth are constituted by the amorphous alloy ribbon having a bent shape as described above, it is not necessary to provide an adhesive portion inside the teeth. Therefore, it is possible to suppress a decrease in the occupation ratio of the magnetic material and improve the motor efficiency.
  • FIG. 1 is a cross-sectional view illustrating a configuration of an electric motor according to a first embodiment.
  • 2 is a cross-sectional view showing a configuration of a stator according to Embodiment 1.
  • FIG. FIG. 3 is a cross-sectional view showing a configuration of a stator core according to the first embodiment.
  • It is sectional drawing (A) which shows the stator block which comprises the stator core of Embodiment 1, a side view (B), and a perspective view (C).
  • FIG. 5 is a schematic diagram for explaining the flow of magnetic flux in the stator core of the first embodiment.
  • FIG. 3 is a flowchart for explaining a manufacturing process of the electric motor according to the first embodiment. It is sectional drawing which shows the 1st modification (A) and 2nd modification (B) of the teeth shape of Embodiment 1.
  • FIG. FIG. 6 is a cross-sectional view showing a configuration of a stator core according to a second embodiment.
  • FIG. 6 is a cross-sectional view illustrating a configuration of a stator core according to a third embodiment.
  • FIG. 6 is a cross-sectional view showing a configuration of a stator core according to a fourth embodiment.
  • FIG. 10 is a cross-sectional view illustrating a configuration of a stator core according to a fifth embodiment.
  • FIG. 5 is a cross-sectional view showing a configuration of a rotary compressor to which the electric motors of Embodiments 1 to 5 are applied.
  • FIG. 6 is a schematic diagram showing the configuration of a vacuum cleaner to which the electric motors of Embodiments 1 to 5 are applied.
  • FIG. 1 is a longitudinal sectional view showing the configuration of the electric motor 100 of the first embodiment.
  • the electric motor 100 of Embodiment 1 is a brushless DC motor, for example.
  • the electric motor 100 includes a rotor 2, an annular stator 1 disposed around the rotor 2, a frame (housing) 80 in which the stator 1 is accommodated, bearings 85 and 86, and a spring 87.
  • the frame 80 is divided into a first frame portion 81 and a second frame portion 82 in the direction of the rotation axis (axis C1) of the rotor 2.
  • the second frame portion 82 has a cylindrical shape, and the stator 1 is inserted inside.
  • the second frame portion 82 has a bearing holding portion 82a at one end in the axial direction (the lower end in FIG. 1).
  • a bearing 86 is mounted inside the bearing holding portion 82a.
  • the second frame portion 82 has an opening at the end on the first frame portion 81 side (upper end in FIG. 1), and a flange portion 82b is formed around the opening.
  • the first frame portion 81 is a member provided to close the opening of the second frame portion 82.
  • the first frame portion 81 has a bearing holding portion 81a, and a bearing 85 is mounted on the inside thereof. Further, the first frame portion 81 has a flange portion 81b at the end on the second frame portion 82 side.
  • the flange portions 81b and 82b of the first frame portion 81 and the second frame portion 82 are fixed to each other by bonding, fastening with screws, or welding.
  • the bearings 85 and 86 support the shaft 25 of the rotor 2 to be rotatable.
  • the shaft 25 protrudes outside through the first frame portion 81 in the axial direction.
  • the spring 87 is composed of, for example, a wave washer.
  • the direction of the axis C1 that is the rotation axis of the rotor 2 (that is, the central axis of the shaft 25) is referred to as “axial direction”.
  • the rotational circumferential direction around the axis C1 (that is, the direction along the outer circumference of the stator 1 and the rotor 2) is referred to as “circumferential direction”.
  • the rotational radial direction around the axis C1 (that is, the radial direction of the stator 1 and the rotor 2) is referred to as “radial direction”.
  • the rotor 2 has a rotor core 20 attached to the shaft 25 described above.
  • the rotor core 20 is obtained by laminating electromagnetic steel plates in the axial direction.
  • a center hole 23 that fits into the shaft 25 is formed.
  • a plurality of magnet insertion holes 22 are formed along the outer peripheral surface of the rotor core 20.
  • a permanent magnet 24 is arranged in each magnet insertion hole 22.
  • the permanent magnets 24 are evenly arranged in the circumferential direction of the rotor core 20.
  • the number of permanent magnets 24 (the number of magnetic poles) may be two or more.
  • the permanent magnet 24 is magnetized so that the magnetic poles adjacent in the circumferential direction have opposite polarities (N pole or S pole).
  • FIG. 2 is a cross-sectional view showing a configuration of stator 1 of electric motor 100 of the first embodiment.
  • FIG. 2 corresponds to a cross-sectional view in the direction of the arrows along line II-II in FIG.
  • the outer periphery of the rotor core 20 of the rotor 2 is indicated by a one-dot chain line.
  • the stator 1 has a stator core 10, an insulator 12 disposed on the stator core 10, and a coil 11 (winding) wound around the stator core 10 via the insulator 12.
  • the stator core 10 includes an annular yoke 4 centering on an axis C1 that is a rotation axis of the rotor 2, and a plurality (four in this case) of teeth 3 extending radially inward from the yoke 4 toward the axis C1.
  • the teeth 3 are arranged at equal intervals in the circumferential direction around the axis C1.
  • a slot is formed between the teeth 3 adjacent in the circumferential direction.
  • the insulator 12 is attached to the periphery of the teeth 3 and the inner peripheral surface (radially inner surface) of the yoke 4.
  • the insulator 12 is made of a resin such as PPS (polyphenylene sulfide) or PBT (polybutylene terephthalate).
  • the insulator 12 is formed by mounting a resin molded body on the stator core 10 or by molding the resin core into a mold in which the stator core 10 is set and molding the resin core integrally with the stator core 10.
  • the insulator 12 may be formed by attaching a resin film such as PET (polyethylene terephthalate) to the stator core 10.
  • the insulator 12 includes a wall portion 12 a formed around the teeth 3, a flange portion 12 b that protrudes in the circumferential direction (toward the adjacent teeth 3) from the radially inner end portion of the teeth 3, And a wall portion 12c formed along the peripheral surface.
  • the wall portion 12a, the flange portion 12b, and the wall portion 12c of the insulator 12 surround an area in which the coil 11 is accommodated.
  • the coil 11 is wound around the teeth 3 via the insulator 12.
  • the coil 11 is wound by concentrated winding, and the terminals at the beginning and end of winding are connected by a predetermined connection method (for example, Y connection or ⁇ connection in the case of a three-phase motor).
  • FIG. 3 is a cross-sectional view showing the configuration of the stator core 10.
  • the yoke 4 has a regular N-gonal shape (here, a regular hexagon) centered on the axis C1.
  • Each side of the regular N-gon of the yoke 4 is referred to as a unit yoke 40 (yoke portion).
  • the yoke 4 has six unit yokes 40, and each unit yoke 40 and the teeth 3 are connected in a T shape.
  • a tip portion 3 a is formed on the radially inner side of the teeth 3 along the cylindrical surface 3 f (FIG. 4A) facing the outer peripheral surface of the rotor core 20.
  • a minute gap (air gap) is formed between the tip 3 a of the tooth 3 and the outer peripheral surface of the rotor core 20.
  • a root portion 3 b connected to the yoke 4 is formed on the radially outer side of the tooth 3. Further, side portions 3 c around which the coil 11 is wound via the insulator 12 are formed on both sides in the circumferential direction of the tooth 3.
  • Each unit yoke 40 is divided into a first yoke portion 41 and a second yoke portion 42 with a circumferential center portion interposed therebetween.
  • Each of the first yoke portion 41 and the second yoke portion 42 extends linearly in a direction orthogonal to the extending direction of the teeth 3 (that is, a circumferential direction centering on the axis C1).
  • the first yoke portion 41 and the second yoke portion 42 have shapes that are symmetrical to each other with respect to the circumferential center portion of the unit yoke 40 (that is, the circumferential center portion of the tooth 3).
  • the first yoke portion 41 has an inner end portion (first end portion) 41 a at the central portion in the circumferential direction of the unit yoke 40, and an outer end portion (second end portion) at the circumferential end portion of the unit yoke 40. ) 41b.
  • the inner end portion 41 a is a portion connected to the second yoke portion 42 belonging to the same unit yoke 40.
  • the outer end portion 41 b is a portion connected to the adjacent unit yoke 40.
  • the inner end portion 41 a extends in parallel with the extending direction of the teeth 3.
  • the outer end portion 41b extends in a direction inclined with respect to the extending direction of the inner end portion 41a, more specifically, in a direction in which the circumferential length of the first yoke portion 41 becomes longer toward the radially outer side.
  • the first yoke portion 41 further includes a radially inner inner peripheral surface 41c and a radially outer peripheral surface 41d.
  • the teeth 3 are connected to the inner peripheral surface 41c.
  • the second yoke portion 42 has an inner end portion (first end portion) 42 a at the center portion in the circumferential direction of the unit yoke 40, and an outer end portion (second end portion) at the circumferential end portion of the unit yoke 40. ) 42b.
  • the inner end portion 42 a is a portion connected to the first yoke portion 41 belonging to the same unit yoke 40.
  • the outer end portion 42 b is a portion connected to the adjacent unit yoke 40.
  • the inner end 42 a extends in parallel with the extending direction of the teeth 3.
  • the outer end portion 42b extends in a direction inclined with respect to the extending direction of the inner end portion 42a, more specifically, in a direction in which the circumferential length of the second yoke portion 42 becomes longer toward the radially outer side.
  • the second yoke portion 42 further includes an inner circumferential surface 42c on the radially inner side and an outer circumferential surface 42d on the radially outer side.
  • the teeth 3 are connected to the inner peripheral surface 42c.
  • FIG. 4A is a cross-sectional view showing the configuration of the tooth 3.
  • FIG. 4B is a side view of the tooth 3 viewed from the direction indicated by the arrow IVB in FIG.
  • FIG. 4C is a perspective view schematically showing the configuration of the tooth 3.
  • the teeth 3 are obtained by bending the amorphous alloy ribbon 15 in a zigzag manner, that is, by alternately repeating a mountain fold portion and a valley fold portion.
  • the teeth 3 are formed by alternately bending the amorphous alloy ribbon 15 whose width direction coincides with the axial direction (the direction of the axis C1) at the tip portion 3a and the root portion 3b.
  • the thickness of the amorphous alloy ribbon 15 is, for example, 30 ⁇ m. 4A and the like, the gap 3e of the amorphous alloy ribbon 15 is exaggerated, but the gap 3e is formed as small as possible so long as the amorphous alloy ribbon 15 can be bent.
  • the amorphous alloy ribbon 15 constituting the tooth 3 has a plurality of sections 3k extending in the radial direction between the tip portion 3a and the root portion 3b in the circumferential direction. It has a shape that is bent (bent) at the tip portion 3a and the root portion 3b so as to line up. Further, the tip 3 a is formed along a cylindrical surface 3 f that faces the outer peripheral surface of the rotor core 20. On the other hand, the root portion 3b is formed along a plane orthogonal to the radial direction.
  • the amorphous alloy ribbon 15 bent in this way is integrally fixed by adhesives (fixing portions) 33 and 34 at both ends in the axial direction.
  • a block (referred to as a tooth block 35) including the amorphous alloy ribbon 15 is formed.
  • both ends in the axial direction of the amorphous alloy ribbon 15 may be fixed by a method other than an adhesive.
  • FIG. 5A is a cross-sectional view showing the configuration of the first yoke portion 41.
  • the first yoke portion 41 is obtained by bending the amorphous alloy ribbon 16 into a zigzag fold. More specifically, the first yoke portion 41 is formed by alternately bending the film-like amorphous alloy ribbon 16 whose width direction coincides with the axial direction at the inner end portion 41a and the outer end portion 41b. Yes.
  • the amorphous alloy ribbon 16 constituting the first yoke portion 41 is arranged such that a plurality of sections 41k extending in the circumferential direction between the inner end portion 41a and the outer end portion 41b are arranged in the radial direction.
  • the inner end 41a and the outer end 41b are bent.
  • the inner end portion 41 a is formed along a plane parallel to the extending direction of the teeth 3.
  • the outer end portion 41b is inclined with respect to the inner end portion 41a. More specifically, the outer end portion 41b is inclined such that the circumferential length of the section 41k becomes longer toward the radially outer side.
  • FIG. 5 (C) is a side view of the first yoke portion 41 as viewed from the direction indicated by the arrow VC in FIG. 5 (A). Both ends in the axial direction of the amorphous alloy ribbon 16 bent as described above are integrally fixed by adhesives (fixing portions) 45a and 45b, respectively. As a result, a block including the amorphous alloy ribbon 16 (referred to as a yoke block 45) is formed.
  • the yoke block 45 can be handled as an independent part in the manufacturing process of the electric motor 100. Note that both ends in the axial direction of the amorphous alloy ribbon 16 may be fixed by a method other than an adhesive.
  • FIG. 5B is a cross-sectional view showing the configuration of the second yoke portion 42.
  • the second yoke portion 42 is obtained by bending the amorphous alloy ribbon 16 into a zigzag fold. More specifically, the second yoke portion 42 is formed by alternately bending the film-like amorphous alloy ribbon 16 whose width direction coincides with the axial direction at the inner end portion 42a and the outer end portion 42b. Yes.
  • the amorphous alloy ribbon 16 constituting the second yoke portion 42 has a plurality of sections 42k extending in the circumferential direction between the inner end portion 42a and the outer end portion 42b.
  • the inner end 42a and the outer end 42b are bent.
  • the inner end portion 42 a is formed along a plane parallel to the extending direction of the teeth 3.
  • the outer end portion 42b is inclined with respect to the inner end portion 42a. More specifically, the outer end portion 42b is inclined such that the circumferential length of the section 42k becomes longer toward the radially outer side.
  • FIG. 5D is a side view of the second yoke portion 42 viewed from the direction indicated by the arrow VD in FIG. Both ends in the axial direction of the amorphous alloy ribbon 16 bent as described above are integrally fixed by adhesives (fixing portions) 46a and 46b, respectively. Thereby, a block (referred to as a yoke block 46) including the amorphous alloy ribbon 16 is formed.
  • a yoke block 46 including the amorphous alloy ribbon 16 is formed.
  • the yoke block 46 can be handled as an independent part in the manufacturing process of the electric motor 100. Note that both ends in the axial direction of the amorphous alloy ribbon 16 may be fixed by a method other than an adhesive.
  • the tooth block 35 and the yoke blocks 45 and 46 described above are joined to each other by welding, for example, to constitute the stator core 10 (the teeth 3 and the yoke 4).
  • the yoke block 45 constituting the first yoke portion 41 and the yoke block 46 constituting the second yoke portion 42 are joined to each other by welding at a radially outer joint portion 62 at the circumferential central portion of the unit yoke 40.
  • the bent portion (folded portion) of the amorphous alloy ribbon 16 at the inner end portion 41a of the first yoke portion 41, and the bent portion of the amorphous alloy ribbon 16 at the inner end portion 42a of the second yoke portion 42 Adhere to each other.
  • the tooth block 35 constituting the tooth 3 is joined to the inner peripheral surfaces 41c and 42c of the yoke blocks 45 and 46 by welding at the joint portions 61 on both sides in the circumferential direction of the root portion 3b.
  • the bent portion of the amorphous alloy ribbon 15 at the root portion 3 b of the tooth 3 is in close contact with the inner peripheral surfaces 41 c and 42 c of the first yoke portion 41 and the second yoke portion 42.
  • stator core 10 having an annular yoke 4 and a plurality of (here, six) teeth 3 is formed.
  • joining of the teeth block 35 and the yoke blocks 45 and 46 is not limited to welding, For example, you may join by adhesion
  • FIG. 6 is a schematic diagram showing the flow of magnetic flux in the teeth 3 and the yoke 4.
  • the magnetic flux F1 from the permanent magnet 24 (FIG. 1) of the rotor 2 flows into the tip 3a of the tooth 3, and flows inside the tooth 3 outward in the radial direction, that is, toward the root 3b.
  • the magnetic flux F1 is radial in the inside of the tooth 3. Therefore, an increase in magnetic resistance is suppressed.
  • the magnetic fluxes F2 and F3 flowing into the first yoke portion 41 and the second yoke portion 42 from the root portion 3b of the tooth 3 are disposed on both sides in the circumferential direction in the first yoke portion 41 and the second yoke portion 42. It flows (toward the outer ends 41b and 42b).
  • the extending direction of the amorphous alloy ribbon 16 in the first yoke portion 41 and the second yoke portion 42 is the longitudinal direction of the first yoke portion 41 and the second yoke portion 42 (centering on the axis C1). Therefore, the magnetic fluxes F2 and F3 are likely to flow in the circumferential direction in the first yoke portion 41 and the second yoke portion 42, and thus an increase in magnetic resistance is suppressed.
  • the teeth 3 no adhesive is interposed between the amorphous alloy ribbons 15, and the gap 3e between the amorphous alloy ribbons 15 is also minute.
  • the teeth 3 and the second yoke portion 42 no adhesive is interposed between the amorphous alloy ribbons 16, and the gaps between the amorphous alloy ribbons 16 are also minute. It is. Therefore, the teeth 3, the first yoke portion 41, and the second yoke portion 42 all have a high occupation ratio of the magnetic material. Therefore, the magnetic resistance when the magnetic flux flows through the teeth 3, the first yoke portion 41 and the second yoke portion 42 can be kept low.
  • the teeth 3, the first yoke portion 41, and the second yoke portion 42 are all formed of an amorphous alloy having a small iron loss and are configured to have a small magnetic resistance. . Therefore, it becomes possible to generate a large output with a small current, and the motor efficiency can be improved.
  • FIG. 7 is a flowchart for explaining a manufacturing process of electric motor 100 of the first embodiment.
  • the amorphous alloy ribbon 15 is folded in a zigzag manner as described with reference to FIGS. 4A to 4C using a bending machine (step S101).
  • both ends in the axial direction of the bent amorphous alloy ribbon 15 are fixed by the adhesives 33 and 34, respectively, and the tooth block 35 is formed (step S102).
  • the amorphous alloy ribbon 16 is folded in a zigzag manner as shown in FIGS. 4A and 4C by using a bending machine, and both ends in the axial direction of the folded amorphous alloy ribbon 16 are bonded to the adhesive 45a,
  • the yoke block 45 is formed by fixing with 45b.
  • the amorphous alloy ribbon 16 is folded in a zigzag manner as shown in FIGS. 4B and 4D using a bending machine, and both ends in the axial direction of the folded amorphous alloy ribbon 16 are bonded to the adhesive 46a,
  • the yoke block 46 is formed by being fixed at 46b.
  • step S103 the tooth block 35, the yoke block 45, and the yoke block 46 are joined together by welding at the joining portions 61 to 64 shown in FIG. 3 to form the stator core 10 (step S103).
  • the insulator 12 is attached to the stator core 10 (step S104).
  • the insulator 12 may have a resin molded body attached to the stator core 10, or may be molded integrally with the stator core 10 by pouring resin into a mold in which the stator core 10 is previously installed. Further, the insulator 12 may be formed by attaching a resin film to the stator core 10.
  • step S105 the coil 11 is wound around the teeth 3 of the stator core 10 via the insulator 12 using, for example, a coil winding device.
  • step S106 the stator core 10 is press-fitted into the second frame portion 82 of the frame 80 shown in FIG. 1 (step S106). Thereby, the stator 1 which consists of the stator core 10, the insulator 12, and the coil 11 is obtained.
  • the shaft 25 is inserted into the center hole 23 of the rotor core 20, the permanent magnet 24 is inserted into the magnet insertion hole 22, and then the bearings 85 and 86 are attached to the shaft 25. Then, the rotor 2 is inserted inside the stator core 10 of the stator 1 (step S107). Thereafter, the frame 80 is formed by attaching the second frame portion 82 to the first frame portion 81. Thereby, the electric motor 100 is completed (step S108).
  • steps S101 to S108 correspond to the stator 1 manufacturing process (stator manufacturing method).
  • the amorphous alloy ribbons 15 and 16 are formed in advance as independent blocks (tooth block 35 and yoke blocks 45 and 46), and the stator core 10 is formed by joining the blocks 35, 45 and 46 to each other. Can be manufactured. Therefore, the manufacturing process of the electric motor 100 can be simplified.
  • the stator core 10 has the six teeth 3 and the six unit yokes 40 (the first yoke portion 41 and the second yoke portion 42).
  • the number of is not limited to six.
  • the teeth 3 are composed of the amorphous alloy ribbon 15 having a small iron loss, and the amorphous alloy ribbon 15 includes the tip portion 3a and the root portion 3b. And a plurality of sections 3k extending in the radial direction are bent at the tip portion 3a and the root portion 3b so as to be arranged in the circumferential direction. Therefore, it is not necessary to fix the amorphous alloy ribbons 15 with an adhesive, and it is not necessary to provide an adhesive part inside the teeth 3. Therefore, the occupation ratio of the magnetic material in the teeth 3 can be increased, and the motor efficiency can be improved.
  • both ends in the axial direction of the amorphous alloy ribbon 15 are integrally fixed by the adhesives 33 and 34 (fixed portions), the teeth 3 can be handled as independent parts. Therefore, the manufacturing process of the electric motor 100 can be simplified and the manufacturing cost can be reduced.
  • the teeth 3 are joined (for example, welded) to the yoke 4 at both ends in the circumferential direction of the root portion 3b, the teeth 3 are connected to the yoke 4 without obstructing the flow of magnetic flux flowing from the teeth 3 to the yoke 4. And can be attached firmly.
  • the tip 3 a of the tooth 3 has a shape along an arc surface centering on the axis C ⁇ b> 1 that is the rotation center of the rotor 2, the tooth 3 extends between the teeth 3 and the rotor 2 in the circumferential direction.
  • a uniform gap air gap
  • the amorphous alloy ribbon 16 constituting the first yoke portion 41 is arranged so that a plurality of sections 41k extending in the circumferential direction between the inner end portion 41a and the outer end portion 41b are arranged in the radial direction. Since the end 41a and the outer end 41b are bent, the magnetic material occupancy can be increased and the motor efficiency can be improved as in the case of the teeth 3.
  • the amorphous alloy ribbon 16 constituting the second yoke portion 42 is arranged such that a plurality of sections 42k extending in the circumferential direction between the inner end portion 42a and the outer end portion 42b are arranged in the radial direction. Since the inner end 41a and the outer end 42b are bent, the magnetic material occupancy can be increased and the motor efficiency can be improved as in the case of the teeth 3.
  • both ends in the axial direction of the amorphous alloy ribbon 16 constituting the first yoke portion 41 are bonded to an adhesive (fixing portion) 45a.
  • the both ends of the amorphous alloy ribbon 16 constituting the second yoke part 42 in the axial direction are bonded to the adhesive (fixing part) 46a. Since each is integrally fixed by 46b, the 1st yoke part 41 and the 2nd yoke part 42 can be handled as an independent block, respectively. Therefore, the manufacturing process of the electric motor 100 can be simplified and the manufacturing cost can be reduced.
  • first yoke portion 41 and the second yoke portion 42 are in contact with each other at a position corresponding to the central portion in the circumferential direction of the tooth 3 and have a symmetrical shape with each other at the position,
  • the magnetic flux flowing into the yoke 4 tends to flow from the contact portion between the first yoke portion 41 and the second yoke portion 42 to both sides in the circumferential direction. Therefore, magnetic resistance can be suppressed and motor efficiency can be improved.
  • the unit yokes 40 adjacent to the yoke 4 are joined to each other by the joint portions 63 and 64 provided on the inner peripheral surface and the outer peripheral surface, the respective unit units can be obtained without disturbing the magnetic flux flowing inside the yoke 4.
  • the yoke 40 can be firmly integrated.
  • the tip 3a of the tooth 3 is formed along the cylindrical surface 3f (FIG. 4A) facing the rotor 2, but the shape of the tip 3a of the tooth 3 is limited to this. It is not a thing.
  • FIG. 8A is a cross-sectional view showing a configuration of the tooth 31 of the first modified example.
  • the tip 3 h of the tooth 31 of the first modification is formed along a plane 3 g perpendicular to the extending direction of the tooth 31.
  • the teeth 31 are formed in a square shape when viewed in the axial direction, there is an advantage that the bending work of the amorphous alloy ribbon 15 is simplified.
  • FIG. 8B is a cross-sectional view showing a configuration of the tooth 32 of the second modified example.
  • the tip 3a of the tooth 32 of the second modification is formed along the same cylindrical surface 3f (FIG. 4A) as that of the first embodiment, but the rotor 2 is provided on both sides in the circumferential direction of the tooth 32.
  • a retreating portion 3i that retreats in a direction away from (ie, radially outward) is formed.
  • the second modification has an advantage that a steep change in magnetic flux in the teeth 3 when the permanent magnet 24 approaches the teeth 3 as the rotor 2 rotates is suppressed.
  • FIG. 9 is a cross-sectional view showing a configuration of stator core 10A of the second embodiment.
  • each unit yoke (yoke portion) 40 of the yoke 4 is divided into the first yoke portion 41 and the second yoke portion 42.
  • each unit yoke of the yoke 4 ⁇ / b> A is composed of one yoke part (referred to as a yoke part 40).
  • the yoke part 40 has a shape in which the first yoke part 41 and the second yoke part 42 described in the first embodiment are integrated. That is, the yoke portion 40 has outer end portions 40b at both ends in the circumferential direction, an inner peripheral surface 40c at the radially inner side, and an outer peripheral surface 40d at the radially outer side.
  • the inner end portions 41a and 42a) shown in FIG. 3 are not provided.
  • the yoke portion 40 is formed by bending the amorphous alloy ribbon 16 described in the first embodiment into a zigzag fold, and both sides in the axial direction of the bent yoke portion 40 are formed with the same adhesive as the adhesives 33 and 34 (FIG. 4B). Consists of fixed blocks. Therefore, in this Embodiment 2, the unit yoke (yoke part 40) is comprised by one block.
  • the yoke parts 40 adjacent to each other in the circumferential direction are joined to each other by welding at joint parts 63 and 64 at both ends in the radial direction at the outer end part 40b.
  • the outer end portion 40b extends in a direction inclined with respect to the extending direction of the teeth 3, more specifically in a direction in which the circumferential length of the yoke portion 40 becomes longer toward the radially outer side.
  • the configuration of the teeth 3 is as described in the first embodiment.
  • the teeth 3 are joined to the inner circumferential surface 40c of the yoke portion 40 by welding at the joining portions 61 at both ends in the circumferential direction of the root portion 3b.
  • stator core 10 ⁇ / b> A has six teeth 3 and six yoke portions 40 (unit yokes), but the number of teeth 3 and yoke portions 40 is limited to six. Absent.
  • the unit yoke of the yoke 4A is configured by one yoke portion 40, the number of joints (welding points) is larger than that in the first embodiment. Can be reduced. Therefore, it is possible to further reduce the magnetic resistance of the yoke 4A and further improve the motor efficiency.
  • stator core 10A since the number of blocks constituting the stator core 10A is reduced, the assembly of the stator core 10A can be simplified. Therefore, the manufacturing process of the electric motor can be simplified and the manufacturing cost can be reduced.
  • FIG. 10 is a cross-sectional view showing a configuration of stator core 10B of the third embodiment.
  • the yoke is configured by a combination of a plurality of unit yokes (yoke portions).
  • the yoke 48 is configured with a single amorphous alloy ribbon.
  • the yoke 48 is formed in an annular shape centering on the axis C1, and has a radially inner peripheral surface 48a and a radially outer peripheral surface 48b.
  • the yoke 48 is formed of an amorphous alloy ribbon 16 extending from an inner peripheral surface 48a to an outer peripheral surface 48b so as to draw a spiral centering on the axis C1.
  • the amorphous alloy ribbon 16 is wound in a spiral shape, and both ends in the axial direction are fixed with an adhesive similar to the adhesives 33 and 34 (FIG. 4B) to form a block. That is, in the third embodiment, the yoke 48 is configured by one block.
  • the configuration of the teeth 3 is as described in the first embodiment.
  • the teeth 3 are joined to the inner peripheral surface 48a of the yoke 48 by welding at joint portions 61 at both ends in the circumferential direction of the root portion 3b.
  • the stator core 10 ⁇ / b> B has six teeth 3, but the number of teeth 3 is not limited to six.
  • the yoke 48 is not limited to a circular spiral shape, but may be a polygonal spiral shape. In this case, the yoke is formed by winding an amorphous alloy ribbon in a polygonal spiral shape.
  • the yoke 48 is configured as one member, the number of joint portions (welding points) of the yoke 48 is larger than in the first and second embodiments. Can be further reduced. Therefore, the magnetic resistance of the yoke 48 can be further reduced and the motor efficiency can be further improved.
  • the assembly of the stator core 10B can be simplified. Therefore, the manufacturing process of the electric motor can be simplified and the manufacturing cost can be reduced.
  • FIG. 11 is a cross-sectional view showing a configuration of stator core 10C of the fourth embodiment.
  • the yoke is made of an amorphous alloy ribbon.
  • the yoke 5 is made of an electromagnetic steel plate.
  • the yoke 5 is obtained by punching a plurality of electromagnetic steel plates having a thickness of 0.1 to 0.7 mm into ring shapes (the shape of the yoke 5), stacking them in the direction of the axis C1, and fixing them by caulking or the like. .
  • the yoke 5 has an inner peripheral surface 5a on the inner side in the radial direction and an outer peripheral surface 5b on the outer side in the radial direction, and extends in an annular shape about the axis C1.
  • the configuration of the teeth 3 is as described in the first embodiment.
  • the teeth 3 are joined to the inner peripheral surface 5a of the yoke 5 by welding at joint portions 61 at both ends in the circumferential direction of the root portion 3b.
  • the stator core 10 ⁇ / b> C has six teeth 3, but the number of teeth 3 is not limited to six.
  • the yoke 5 is not limited to a circular shape, and may be a polygonal shape as in the first embodiment. In particular, since the outer shape of the yoke 5 is provided by punching a magnetic steel sheet, it can easily cope with various yoke shapes.
  • the stator core 10C is formed by joining the teeth 3 to the yoke 5 in which electromagnetic steel plates are laminated, so that the assembly of the stator core 10C can be simplified. . Therefore, the manufacturing process of the electric motor can be simplified and the manufacturing cost can be reduced.
  • the yoke 5 is made of a punched electromagnetic steel plate, the design freedom of the yoke 5 is increased, and the yoke 5 can be formed in a shape suitable for miniaturization of the electric motor 100.
  • FIG. 12 is a cross-sectional view showing a configuration of stator core 10D of the fifth embodiment.
  • the yoke is made of an amorphous alloy ribbon, and in the stator core of the fourth embodiment, the yoke is made of an electromagnetic steel plate.
  • the yoke 6 is composed of a powder iron core.
  • the yoke 6 is obtained by filling a mold with a powder material obtained by mixing a soft magnetic powder (powder iron core) and a binder resin, and press-molding it.
  • the yoke 6 has an inner circumferential surface 6a on the radially inner side and an outer circumferential surface 6b on the radially outer side, and extends in an annular shape about the axis C1.
  • the configuration of the teeth 3 is as described in the first embodiment.
  • the yoke 6 is formed integrally with the teeth 3 by previously installing the base portion 3b of the teeth 3 in the mold during the press forming described above. That is, in the fifth embodiment, the yoke 6 is formed (powder core pressing) and the teeth 3 are joined to the yoke 6 in the same process. Further, the root portion 3 b of the tooth 3 is fixed in a state of being embedded in the yoke 6.
  • the stator core 10 ⁇ / b> D has six teeth 3, but the number of teeth 3 is not limited to six.
  • the yoke 6 is not limited to a circular shape, and may be a polygonal shape as in the first embodiment. In particular, since the outer shape of the yoke 6 is applied by press molding, various yoke shapes can be easily accommodated. Further, it is desirable that the root portion 3b of the tooth 3 is formed integrally with the yoke 6 at the time of press molding, but the tooth 3 may be joined to the yoke 6 by welding or the like.
  • the stator core 10D is formed by joining the teeth 3 to the yoke 6 that is formed of a powdered iron core molded body. can do. Therefore, the manufacturing process of the electric motor can be simplified and the manufacturing cost can be reduced.
  • the base 3b of the tooth 3 is formed integrally with the powder iron core, so that the yoke 6 can be formed and the tooth 3 can be joined in the same process. Therefore, the stator core 10D can be manufactured more easily, and the manufacturing cost can be further reduced.
  • FIG. 13 is a cross-sectional view showing the configuration of the rotary compressor 300.
  • the rotary compressor 300 includes an airtight container 307, a compression element 301 disposed in the airtight container 307, and an electric motor 100 that drives the compression element 301.
  • the compression element 301 divides the inside of the cylinder chamber 303 into a suction side and a compression side, a cylinder 302 having a cylinder chamber 303, a shaft 25 (FIG. 1) rotated by the electric motor 100, a rolling piston 304 fixed to the shaft 25. It has a vane (not shown), and an upper frame 305 and a lower frame 306 into which the shaft 25 is inserted to close the axial end surface of the cylinder chamber 303.
  • An upper discharge muffler 308 and a lower discharge muffler 309 are mounted on the upper frame 305 and the lower frame 306, respectively.
  • the sealed container 307 is a cylindrical container formed by drawing a steel plate having a thickness of 3 mm, for example. Refrigerating machine oil (not shown) that lubricates the sliding portions of the compression element 301 is stored at the bottom of the sealed container 307.
  • the shaft 25 is rotatably held by an upper frame 305 and a lower frame 306 as bearing portions.
  • the cylinder 302 has a cylinder chamber 303 inside.
  • the rolling piston 304 rotates eccentrically within the cylinder chamber 303.
  • the shaft 25 has an eccentric shaft portion, and a rolling piston 304 is fitted to the eccentric shaft portion.
  • the sealed container 307 has a cylindrical frame 315.
  • the stator 1 of the electric motor 100 is attached to the inside of the frame 315 by a method such as shrink fitting or welding. Electric power is supplied to the coil 11 of the stator 1 from a glass terminal 311 fixed to the hermetic container 307.
  • the shaft 25 is fixed to a center hole 23 formed at the center of the rotor core 20 (FIG. 1) of the rotor 2.
  • An accumulator 310 that stores refrigerant gas is attached to the outside of the sealed container 307.
  • a suction pipe 313 is fixed to the sealed container 307, and refrigerant gas is supplied from the accumulator 310 to the cylinder 302 via the suction pipe 313.
  • a discharge pipe 312 for discharging the refrigerant to the outside is provided on the top of the sealed container 307.
  • refrigerant for example, R410A, R407C, or R22 can be used. Moreover, it is desirable to use a low GWP (global warming potential) refrigerant from the viewpoint of preventing global warming.
  • GWP global warming potential
  • the operation of the rotary compressor 300 is as follows.
  • the refrigerant gas supplied from the accumulator 310 is supplied into the cylinder chamber 303 of the cylinder 302 through the suction pipe 313.
  • the shaft 25 rotates together with the rotor 2.
  • the rolling piston 304 fitted to the shaft 25 rotates eccentrically in the cylinder chamber 303 and the refrigerant is compressed in the cylinder chamber 303.
  • the refrigerant compressed in the cylinder chamber 303 passes through the discharge mufflers 308 and 309, and further rises in the sealed container 307 through a hole (not shown) provided in the rotor core 20.
  • the refrigerant rising in the hermetic container 307 is discharged from the discharge pipe 312 and supplied to the high-pressure side of the refrigeration cycle.
  • the refrigerant compressed in the cylinder chamber 303 is mixed with refrigerating machine oil. However, when passing through a hole provided in the rotor core 20, separation of the refrigerant and refrigerating machine oil is promoted, and the refrigerating machine oil discharge pipe Inflow to 312 is prevented.
  • the rotary compressor 300 can be applied to the electric motor 100 described in each embodiment, and the electric motor 100 has a small iron loss and sufficient strength. Therefore, the energy efficiency and reliability of the rotary compressor 300 can be improved.
  • the electric motor 100 described in the first to fifth embodiments can be used not only for the rotary compressor 300 but also for other types of compressors.
  • FIG. 14 is a schematic diagram illustrating a vacuum cleaner 400 including a blower 410 to which the electric motor of each embodiment is applied.
  • the vacuum cleaner 400 includes a vacuum cleaner body 401, a pipe 403 connected to the vacuum cleaner body 401, and a suction unit 404 connected to the tip of the pipe 403.
  • the suction unit 404 is provided with a suction port 405 for sucking air containing dust.
  • a dust collection container 402 is disposed inside the cleaner body 401.
  • a blower 410 for sucking air containing dust from the suction unit 404 to the dust collecting container 402 is further arranged inside the vacuum cleaner main body 401.
  • the blower 410 has an impeller attached to the load side of the shaft 25 of the electric motor 100 shown in FIG.
  • the vacuum cleaner main body 401 is provided with a grip portion 406 that is gripped by a user, and the grip portion 406 is provided with an operation portion 407 such as an on / off switch.
  • the blower 410 When the user grips the grip portion 406 and operates the operation portion 407, the blower 410 is activated. When the blower 410 is activated, suction air is generated, and dust is sucked together with air through the suction port 405 and the pipe 403. The sucked dust is stored in a dust collection container 402.
  • the electric vacuum cleaner 400 uses the electric motor 100 of the first to fifth embodiments described above, the electric vacuum cleaner 400 can be reduced in size.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

Un stator est pourvu : d'une culasse s'étendant dans une direction circonférentielle autour d'un axe ; et de dents s'étendant dans une direction radiale autour de l'axe de la culasse à l'axe. Les dents ont une partie d'extrémité de pointe du côté de l'axe et une partie de base du côté de la culasse. Les dents sont constituées d'une bande mince en alliage amorphe. La bande mince en alliage amorphe a une forme courbée au niveau de la partie d'extrémité de pointe et de la partie de base de telle sorte qu'une pluralité de sections s'étendant dans la direction radiale entre la partie d'extrémité de pointe et la partie de base sont disposées dans la direction circonférentielle.
PCT/JP2016/068809 2016-06-24 2016-06-24 Stator, moteur électrique, compresseur, aspirateur et procédé de fabrication de stator Ceased WO2017221399A1 (fr)

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JP2018523249A JP6632722B2 (ja) 2016-06-24 2016-06-24 ステータ、電動機、圧縮機、電気掃除機およびステータの製造方法
PCT/JP2016/068809 WO2017221399A1 (fr) 2016-06-24 2016-06-24 Stator, moteur électrique, compresseur, aspirateur et procédé de fabrication de stator

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PCT/JP2016/068809 WO2017221399A1 (fr) 2016-06-24 2016-06-24 Stator, moteur électrique, compresseur, aspirateur et procédé de fabrication de stator

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JPS6016159A (ja) * 1983-07-07 1985-01-26 Mitsubishi Electric Corp 回転電機の製造方法
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