CN113394897A

CN113394897A - Motor and method for manufacturing motor

Info

Publication number: CN113394897A
Application number: CN202110249518.9A
Authority: CN
Inventors: 高桥俊辅; 石田尚
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2020-03-13
Filing date: 2021-03-08
Publication date: 2021-09-14
Also published as: JP2021145503A

Abstract

The invention provides a motor and a method of manufacturing the motor. The stator includes a stator core, a coil, and a metal connection terminal. The connection terminal is electrically connected to an end of a lead wire of the coil. The housing has a bearing and a plate-shaped bearing holder. The bearing rotatably supports the shaft of the rotor. The bearing holder holds the bearing at an end portion on the radially inner side. The connection terminal is fixed on the bearing holder. Therefore, the position of the connection terminal in the axial direction can be adjusted with high accuracy without being restricted by the position of the stator.

Description

Motor and method for manufacturing motor

Technical Field

The invention relates to a motor and a method for manufacturing the motor

Background

Conventionally, a structure is known in which an end portion of a lead wire constituting a coil of a motor is connected to an external circuit board via a metal terminal. For example, japanese patent No. 6339041 discloses a conventional motor having a terminal. In this publication, terminals (50, 60) are connected to end wires of a coil (70).

Patent document 1: japanese patent No. 6339041

However, in the structure of the above-described publication, the end of the lead is connected to the terminal fixed to the insulator. Therefore, after the end of the wire is connected to the terminal, the position of the terminal is restricted by the stator, and it is difficult to adjust the position of the final terminal in accordance with the circuit board of the connection destination.

Disclosure of Invention

The purpose of the present invention is to provide a technique capable of accurately adjusting the position of a terminal in the axial direction without being restricted by the position of a stator.

The 1 st invention of the present application is a motor including: an annular stator disposed around a central axis extending vertically; a rotor supported to be rotatable about the central axis; and a housing that houses the stator and the rotor, wherein the stator includes: a stator core having an annular core back centered on the central axis and a plurality of teeth extending radially from the core back; a coil formed of a wire wound around the teeth; and a metal connection terminal electrically connected to an end of the lead wire of the coil, wherein the rotor has a shaft extending along the central axis, and the housing has: a bearing rotatably supporting the shaft; and a plate-shaped bearing holder that holds the bearing at an end portion on a radially inner side, the connection terminal being fixed to the bearing holder.

The invention of claim 2 is a method of manufacturing a motor having a coil and a metal connection terminal disposed inside a case, the method comprising:

a) connecting the connection terminal to an end of a wire of the coil; b) inserting the connection terminal into a bearing holder constituting an upper surface of the housing; and c) pulling up the connection terminal with respect to the bearing holder.

According to the 1 st and 2 nd inventions of the present application, the connection terminal is not fixed to the stator but fixed to the bearing holder of the housing. Therefore, the position of the connection terminal in the axial direction can be adjusted with high accuracy without being restricted by the position of the stator.

Drawings

Fig. 1 is an external perspective view of a motor.

Fig. 2 is a plan view of the motor.

Fig. 3 is a longitudinal sectional view of the motor as viewed from a-a position of fig. 2.

Fig. 4 is a longitudinal sectional view of the motor as viewed from a position B-B of fig. 2.

Fig. 5 is a perspective view of the stator.

Fig. 6 is a partial perspective view of the bearing cage.

Fig. 7 is a partial longitudinal sectional view of the connection terminal and the bearing holder.

Fig. 8 is a flowchart showing the flow of the work when fixing the connection terminal.

Fig. 9 is a partial longitudinal sectional view of the motor showing a state when the connection terminal is pulled up.

Description of the reference symbols

1: a motor; 2: a stator; 3: a rotor; 4: a housing; 9: a central axis; 21: a stator core; 22: an insulating member; 23: a coil; 24: a connection terminal; 25: a wire; 31: a shaft; 32: a rotor core; 33: a rotor magnet; 41: a housing main body; 42: a bearing retainer; 43: a lower bearing; 44: an upper bearing; 45: a guide bushing; 51: a terminal upper portion; 52: a terminal intermediate portion; 53: a terminal lower portion; 54: a serration; 55: a hole portion; 251: 1 st lead part; 252: a 2 nd lead part; 253: a 3 rd lead part; 450: an insertion hole; 451: the upper part of the insertion hole; 452: the lower part of the insertion hole; 453: a wall portion; 454: and (4) a notch.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, a direction parallel to the central axis of the motor is referred to as an "axial direction", a direction perpendicular to the central axis of the motor is referred to as a "radial direction", and a direction along an arc centered on the central axis of the motor is referred to as a "circumferential direction". In the present application, the shape and positional relationship of each part will be described with the axial direction as the vertical direction and the bearing holder side as the upper side with respect to the rotor. However, the orientation when the motor of the present invention is manufactured and used is not intended to be limited by the definition of the up-down direction.

The "parallel direction" also includes a substantially parallel direction. The "vertical direction" also includes a substantially vertical direction.

< 1. integral structure of motor

Fig. 1 is an external perspective view of a motor 1 according to an embodiment of the present invention. Fig. 2 is a plan view of the motor 1. Fig. 3 is a longitudinal sectional view of the motor 1 viewed from a-a position of fig. 2. Fig. 4 is a longitudinal sectional view of the motor 1 as viewed from a position B-B in fig. 2. In fig. 4, the upper part of the shaft 31 is not shown.

The motor 1 is mounted on, for example, an automobile and used as a drive source for generating a drive force of an electric power steering apparatus. However, the motor of the present invention may be used for applications other than power steering. For example, the motor of the present invention may be used as a drive source for other parts of an automobile such as a transmission device, a brake device, a traction motor device, an engine cooling fan, or an oil pump. The motor of the present invention may be mounted on a home appliance, an OA equipment, a medical equipment, or the like, and generates various driving forces.

As shown in fig. 1 to 4, the motor 1 includes a stator 2, a rotor 3, and a housing 4. The housing 4 is fixed to a housing of a device to be driven. The stator 2 is fixed to the housing 4. The rotor 3 is supported to be rotatable with respect to the stator 2 and the housing 4.

The stator 2 is an annular unit disposed around the central axis 9. The stator 2 of the present embodiment includes a stator core 21, a plurality of insulators 22, a plurality of coils 23, and three connection terminals 24.

The stator core 21 is formed of a laminated steel sheet in which electromagnetic steel sheets are laminated in the axial direction. The stator core 21 has an annular core back 211 centered on the central axis 9, and a plurality of teeth 212 extending radially inward from the core back 211. The core back 211 is arranged substantially coaxially with the central axis 9. The plurality of teeth 212 are arranged at substantially equal intervals in the circumferential direction.

The insulator 22 is made of resin as an insulator. At least a part of the surface of the stator core 21 is covered with an insulator 22. Specifically, at least the upper surface, the lower surface, and both circumferential end surfaces of each tooth 212 in the surface of the stator core 21 are covered with the insulator 22.

The coil 23 is formed of a wire wound around the insulator 22. That is, in the present embodiment, the lead wire is wound around the teeth 212 as the magnetic core with the insulating material 22 interposed therebetween. The insulator 22 prevents the teeth 212 from being electrically short-circuited with the coil 23 by being sandwiched between the teeth 212 and the coil 23.

The rotor 3 is a unit supported rotatably about a center axis 9 on the radially inner side of the stator 2. The rotor 3 of the present embodiment includes a shaft 31, a rotor core 32, and a plurality of rotor magnets 33.

The shaft 31 is a columnar member extending along the center axis 9. The shaft 31 is made of a metal such as stainless steel. The shaft 31 is supported by a lower bearing 43 and an upper bearing 44, which will be described later, and thereby rotates about the center axis 9. The lower end 311 of the shaft 31 protrudes axially downward from the housing 4. A device to be driven is connected to the upper end 311 of the shaft 31 via a power transmission mechanism such as a gear.

The shaft 31 does not necessarily have to protrude axially downward from the housing 4. That is, the upper end portion of the shaft 31 may protrude axially upward from the housing 4. The shaft 31 may be a hollow member.

The rotor core 32 is formed of a laminated steel sheet in which electromagnetic steel sheets are laminated in the axial direction. The rotor core 32 has a through hole 320 extending in the axial direction at the center thereof. The shaft 31 is press-fitted into the through hole 320 of the rotor core 32. Thereby, the rotor core 32 and the shaft 31 are fixed to each other.

The plurality of rotor magnets 33 are located on the outer peripheral surface of the rotor core 32 or inside the rotor core 32. The radially outer surface of each rotor magnet 33 serves as a magnetic pole surface facing the radially inner end surface of the tooth 212. The plurality of rotor magnets 33 are arranged in the circumferential direction such that N poles and S poles are alternately arranged.

When the motor 1 is driven, a driving current is supplied to the coil 23 from a circuit board outside the figure via the connection terminal 24. Then, a rotating magnetic field is generated in the plurality of teeth 212 of the stator core 21. Then, a torque in the circumferential direction is generated by the magnetic attraction force and the repulsion force between the teeth 212 and the rotor magnet 33. As a result, the rotor 3 rotates about the central axis 9 with respect to the stator 2 and the housing 4.

The housing 4 is a frame that houses the stator 2 and the rotor 3. As shown in fig. 1 to 4, the housing 4 includes a housing main body 41, a bearing holder 42, a lower bearing 43, and an upper bearing 44.

The case body 41 is a bottomed cylindrical container. The material of the case body 41 is, for example, metal such as aluminum or stainless steel. However, resin may be used instead of metal as the material of the housing 4. The case main body 41 has a bottom plate portion 411 and a side wall portion 412. The bottom plate 411 extends in a disc shape substantially perpendicular to the central axis 9 at a position axially below the stator 2. A lower opening 410 is provided in the center of the bottom plate 411. The lower opening 410 axially penetrates the bottom plate 411. The shaft 31 extends axially through the lower opening 410. The side wall portion 412 extends cylindrically in the axial direction from the radially outer end of the bottom plate portion 411. Stator core 21 is fixed to the inner circumferential surface of side wall portion 412.

The bearing holder 42 is a plate-like member that constitutes the upper surface of the housing 4 and holds the upper bearing 44 at the radially inner end portion. The bearing holder 42 extends in a disc shape substantially perpendicular to the center axis 9 at a position axially above the stator 2. The material of the bearing holder 42 is, for example, metal such as aluminum. The peripheral edge portion of the bearing holder 42 is fixed to the upper end portion of the side wall portion 412 of the housing main body 41. An upper opening 420 is provided in the center of the bearing holder 42. The upper opening 420 extends axially through the bearing cage 42. The upper end of the shaft 31 is located within the upper opening 420.

The lower bearing 43 is disposed between the housing body 41 and the shaft 31. The lower bearing 43 is located axially below the rotor core 32. The upper bearing 44 is disposed between the bearing holder 42 and the shaft 31. The upper bearing 44 is located axially above the rotor core 32.

For example, ball bearings that relatively rotate the outer race and the inner race via a plurality of balls are used as the lower bearing 43 and the upper bearing 44. The outer race of the lower bearing 43 is fixed to the radially inner end of the bottom plate 411 of the housing body 41. The outer race of the upper bearing 44 is fixed to a radially inner end of the bearing holder 42. Further, inner rings of the lower bearing 43 and the upper bearing 44 are fixed to the shaft 31. Thereby, the shaft 31 is supported rotatably with respect to the housing body 41 and the bearing holder 42. However, instead of the ball bearing, a bearing of another type such as a slide bearing or a fluid bearing may be used.

< 2 > guide bush and connection terminal

Next, the guide bush 45 attached to the bearing holder 42 of the housing 4 and the connection terminal 24 of the stator 2 will be described. Fig. 5 is a perspective view of the stator 2. Fig. 6 is a partial perspective view of the bearing holder 42. Fig. 7 is a partial longitudinal sectional view of the connection terminal 24 and the bearing holder 42.

As shown in fig. 1 to 4, 6, and 7, the housing 4 of the present embodiment includes a guide bush 45. The guide bush 45 is a resin member having elasticity. The bearing holder 42 has an opening 421 penetrating in the axial direction. The guide bush 45 is inserted into the opening 421 of the bearing holder 42. The guide bush 45 is fixed to the bearing holder 42 by fastening a bolt. However, the guide bush 45 may be fixed to the bearing holder 42 by other fixing methods such as welding. The guide bush 45 has three insertion holes 450. As shown in fig. 7, each insertion hole 450 penetrates the guide bush 45 in the axial direction.

As shown in fig. 6, the guide bush 45 has three wall portions 453. The wall 453 protrudes in a cylindrical shape upward in the axial direction from the upper surface of the guide bush 45. The insertion hole 450 and the space inside the wall portion 453 are axially connected. Further, a portion of the wall 453 on the radially inner side has a notch 454. The space inside wall 453 is connected to the space radially inside wall 453 via notch 454.

As shown in fig. 5, the stator 2 of the present embodiment has 12 coils 23. The 12 coils 23 are composed of six wires 25. The six wires 25 include two U-phase wires through which a U-phase current of three-phase alternating current flows, two V-phase wires through which a V-phase current flows, and two W-phase wires through which a W-phase current flows. Four coils 23 of the twelve coils 23 are formed of two U-phase wires. Four coils 23 of the remaining eight coils 23 are formed of two V-phase wires. The remaining four coils 23 are formed of two W-phase wires.

The stator 2 has three connection terminals 24. The connection terminal 24 is a metal member having conductivity. As shown in fig. 5, one end of the six wires 25 is drawn out upward in the axial direction from the coil 23. Then, the one end of each lead 25 is soldered to the connection terminal 24. Thereby, the lead 25 is electrically connected to the connection terminal 24. In the present embodiment, one end of each of the two U-phase conductors is connected to one connection terminal 24. Further, one end portions of the two V-phase wires are connected to the other connection terminal 24. Further, one end of each of the two W-phase wires is connected to the remaining one of the connection terminals 24. The other ends of the six wires 25 are drawn out axially downward from the coil 23 and electrically connected to each other.

The three connection terminals 24 have the same shape. Each connection terminal 24 has a plate shape extending in the axial direction. As shown in fig. 7, the connection terminal 24 has a terminal upper portion 51, a terminal intermediate portion 52, and a terminal lower portion 53. The terminal upper portion 51 is located at the axially uppermost side of the connection terminal 24. The terminal intermediate portion 52 is located axially below the terminal upper portion 51. The terminal lower portion 53 is located axially below the terminal intermediate portion 52. The terminal intermediate portion 52 has a width larger than the widths of the terminal upper portion 51 and the terminal lower portion 53. That is, if the direction perpendicular to both the thickness direction and the axial direction of the connection terminal 24 is defined as the "width direction", the dimension in the width direction of the terminal intermediate portion 52 is larger than the dimensions in the width direction of the terminal upper portion 51 and the terminal lower portion 53.

The terminal intermediate portion 52 has saw-tooth portions 54 having a concave-convex shape at both ends in the width direction. The serration 54 has a shape in which a plurality of minute protrusions protruding outward in the width direction are arranged in the axial direction. In addition, the terminal intermediate portion 52 has a hole portion 55. The hole 55 penetrates the terminal intermediate portion 52 in the plate thickness direction of the connection terminal 24 at the center in the width direction of the terminal intermediate portion 52. The serration 54 is located axially below the hole 55.

In the present embodiment, the upper end of the hole 55 has an arc shape. That is, the width dimension of the upper end of the hole 55 gradually increases toward the lower side in the axial direction. In this way, in step S5 described later, the jig 90 is engaged with the center of the upper end of the hole 55, and the connection terminal 24 is easily pulled up directly upward. Further, the metal width of the connection terminal 24 does not change significantly around the hole 55, and thus a change in resistance can be suppressed.

The three connection terminals 24 are inserted into the three insertion holes 450 of the guide bush 45, respectively. Moreover, the serration portions 54 of the terminal intermediate portion 52 are engaged with both widthwise edges of the insertion hole 450. Thereby, the terminal intermediate portion 52 of the connection terminal 24 is fixed to the guide bush 45. That is, each connection terminal 24 is fixed to the guide bush 45 in a state of being inserted into the insertion hole 450. In addition, the upper portion of the terminal intermediate portion 52 is held on the wall portion 453.

As described above, in the motor 1 of the present embodiment, the connection terminal 24 is fixed not to the insulator 22 of the stator 2 but to the bearing holder 42 of the housing 4. Therefore, the position of the connection terminal 24 in the axial direction can be accurately adjusted without being restricted by the position of the insulator 22. When the motor 1 is used, the terminal upper part 51 of the connection terminal 24 is connected to the circuit board. By fixing the connection terminal 24 not to the insulator 22 of the stator 2 but to the bearing holder 42 of the housing 4, the connection terminal 24 can be positioned with high accuracy with respect to the circuit board.

Fig. 8 is a flowchart showing the flow of work when the connection terminal 24 is fixed in the manufacturing process of the motor 1. At the start (start) of fig. 8, the rotor 3 and the portion of the stator 2 other than the connection terminal 24 are already arranged inside the housing main body 41. However, the upper portion of the housing body 41 is not yet covered by the bearing holder 42.

When fixing the connection terminal 24, first, the connection terminal 24 is connected to one end of each of the three lead wires 25 (step S1). As shown in fig. 5 and 7, the lower end portion of the terminal lower portion 53 of the connection terminal 24 has a U-shaped portion 531 folded back in the thickness direction. In step S1, one end of the lead wire 25 is inserted into the U-shaped portion 531. One end of the inserted lead wire 25 is welded to the U-shaped portion 531.

Next, the bearing holder 42 to which the guide bush 45 is attached is prepared. Then, the connection terminals 24 are inserted into the three insertion holes 450 of the guide bush 45, respectively, from the lower surface side of the bearing holder 42 (step S2).

As shown in fig. 7, insertion hole 450 has an insertion hole upper portion 451 and an insertion hole lower portion 452. The insertion hole lower portion 452 is located axially below the insertion hole upper portion 451. The width-directional dimension of the insertion hole upper portion 451 is the same as or slightly wider than the width-directional dimension of the terminal intermediate portion 52. The insertion hole lower portion 452 has a larger dimension in the width direction than the insertion hole upper portion 451. That is, the width of the insertion hole lower portion 452 is larger than the width of the insertion hole upper portion 451.

The terminal intermediate portion 52 of the connection terminal 24 is first inserted into the wide insertion hole lower portion 452. Thereby, the position of the terminal intermediate portion 52 in the width direction is restricted to some extent. Then, the terminal intermediate portion 52 is inserted from the insertion hole lower portion 452 to the insertion hole upper portion 451. This allows the terminal intermediate portion 52 to be smoothly inserted into the insertion hole upper portion 451.

As shown in fig. 7, the upper end portion of the terminal intermediate portion 52 has a pair of tapered portions 521 that extend obliquely with respect to the axial direction. Therefore, the width-directional dimension of the upper end portion of the terminal intermediate portion 52 gradually increases toward the lower side in the axial direction. In step S2, the terminal intermediate portion 52 is inserted into the insertion hole upper portion 451 while the tapered portion 521 is brought into contact with both end edges of the lower end portion of the insertion hole upper portion 451. This allows the terminal intermediate portion 52 to be inserted into the insertion hole upper portion 451 while gradually positioning the terminal intermediate portion 52 with respect to the position in the width direction of the insertion hole upper portion 451. As a result, the terminal intermediate portion 52 can be inserted into the insertion hole upper portion 451 more smoothly.

After that, when the upper ends of the serration parts 54 of the terminal intermediate parts 52 are inserted into the insertion hole upper part 451, the upper ends of the serration parts 54 are engaged with both widthwise end edges of the insertion hole upper part 451. Thereby, the connection terminal 24 is temporarily fixed to the guide bush 45 (step S3).

After temporarily fixing the three connection terminals 24 to the guide bush 45, the worker covers the upper portion of the housing main body 41 with the bearing holder 42 (step S4). Then, the peripheral edge portion of the bearing holder 42 is fixed to the upper end portion of the side wall portion 412 of the housing main body 41. At this time, the lead wire 25 is not linear but in a bent state between the coil 23 and the connection terminal 24. Specifically, as shown in fig. 4, the lead 25 is in a state of having the 1 st lead portion 251, the 2 nd lead portion 252, and the 3 rd lead portion 253.

The 1 st lead part 251 extends from the coil 23 toward the axially upper side. The 2 nd lead portion 252 extends from the upper end portion of the 1 st lead portion 251 toward the lower position in the axial direction of the connection terminal 24. The 3 rd lead portion 253 extends upward in the axial direction from the distal end portion of the 2 nd lead portion 252. The upper end of the 3 rd lead portion 253 is connected to the U-shaped portion 531. Here, the sum of the length of the 2 nd lead portion 252 and the length of the 3 rd lead portion 253 is made longer than the linear distance between the upper end portion of the 1 st lead portion 251 and the upper end portion of the 3 rd lead portion 253. That is, the sum of the lengths of the 2 nd lead portion 252 and the 3 rd lead portion 253 has a margin. In this way, in the next step S5, it is possible to suppress excessive tension from being applied to the lead wire 25.

Fig. 9 is a partial longitudinal sectional view of the motor 1 illustrating the state of step S5. When the connection terminal 24 is temporarily fixed to the guide bush 45, the hole 55 of the connection terminal 24 is exposed on the upper surface side of the bearing holder 42. Specifically, the hole 55 of the connection terminal 24 is exposed in the notch 454 of the wall 453 of the guide bush 45. The operator engages the L-shaped jig 90 with the hole 55 of the connection terminal 24 through the notch 454. Then, the jig 90 is moved upward in the axial direction. Thereby, the connection terminal 24 is pulled upward in the axial direction inside the insertion hole 450 (step S5). At this time, the worker can pull up the jig 90 while checking the position of the hole 55 of the connection terminal 24 through the notch 454.

In step S5, the serration 54 of the connection terminal 24 moves upward in the axial direction with respect to the guide bush 45 while engaging with both widthwise end edges of the insertion hole upper portion 451. The operator stops the movement of the jig 90 in the upper direction in the axial direction at a desired position (step S6). This allows the connection terminal 24 to be positioned with high accuracy in the axial direction with respect to the insertion hole 450 of the guide bush 45.

< 3. modification example >

While one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

The connection terminal 24 of the above embodiment has a shape having a wide terminal intermediate portion 52 between a terminal upper portion 51 and a terminal lower portion 53. However, the connection terminal 24 may have other shapes. For example, the terminal upper portion 51, the terminal intermediate portion 52, and the terminal lower portion 53 may have the same width-directional dimension.

The connection terminal 24 of the above embodiment is fixed to the guide bush 45 by the serration 54. However, the connection terminal 24 may be fixed to the guide bush 45 by other methods. For example, the connection terminal 24 may be fixed to the guide bush 45 by melting a part of the guide bush 45

In the above embodiment, the connection terminal 24 is fixed to the metal bearing holder 42 via the resin guide bush 45. However, the bearing holder 42 may be made of resin, and the connection terminal 24 may be directly fixed to the bearing holder 42.

In the above embodiment, the case main body 41 is a single member. However, the housing main body 41 may be formed of a plurality of members. For example, the bottom plate 411 and the side wall 412 may be separate members.

The detailed shapes of the components constituting the motor may be different from those shown in the drawings of the present application. In addition, the respective elements appearing in the above embodiment and the modified examples may be appropriately combined within a range in which no contradiction occurs.

Industrial applicability

The present invention can be applied to a motor and a motor manufacturing method.

Claims

1. A motor having:

an annular stator arranged around a central axis extending up and down;

a rotor supported so as to be rotatable about the central axis; and

a housing that houses the stator and the rotor,

in,

The stator has:

a stator core having an annular core back centered on the central axis and a plurality of teeth radially extending from the core back;

a coil consisting of a wire wound on the teeth; and

a metal connection terminal electrically connected to the end of the wire of the coil,

The rotor has a shaft extending along the central axis,

The housing has:

a bearing that supports the shaft for rotation; and

a plate-shaped bearing retainer that retains the bearing at its radially inner end,

The connection terminal is fixed on the bearing holder.

2. The motor of claim 1 wherein,

The bearing cage is a metal member having an opening portion penetrating in the axial direction,

The housing further has a resin-made guide bush mounted in the opening of the bearing holder,

The guide bush has an insertion hole penetrating in the axial direction,

The connection terminal is fixed to the guide bush in a state of being inserted into the insertion hole.

3. The motor of claim 2, wherein,

The connecting terminal has:

the upper part of the terminal;

a middle portion of the terminal, which is located on the axial lower side of the upper portion of the terminal; and

the lower part of the terminal, which is located on the axial lower side of the middle part of the terminal,

the wire is connected to the lower part of the terminal,

The width of the middle part of the terminal is larger than the width of the upper part of the terminal and the lower part of the terminal,

The terminal intermediate portion is fixed to the guide bush.

4. The motor of claim 3, wherein,

The end edge of the middle portion of the terminal has a serrated portion in a concave-convex shape,

The serrated portion is engaged with the edge of the insertion hole of the guide bush.

5. The motor of claim 4, wherein,

The connection terminal has a hole portion penetrating the intermediate portion of the terminal in the plate thickness direction of the connection terminal.

6. The motor of claim 5, wherein,

The serrated portion is located on the lower side in the axial direction than the hole portion.

7. The motor of claim 5 or 6, wherein,

The guide bush has a wall portion holding the intermediate portion of the terminal,

The wall portion has a notch,

The hole portion is exposed at the notch.

8. The motor of any one of claims 3 to 7, wherein,

The width of the upper end portion of the intermediate portion of the terminal gradually increases toward the lower side in the axial direction.

9. The motor of claim 8, wherein,

The width of the upper end of the hole portion gradually increases toward the lower side in the axial direction.

10. The motor of any one of claims 3 to 9, wherein,

The insertion hole has:

the upper part of the insertion hole; and

The lower part of the insertion hole is located on the lower side in the axial direction than the upper part of the insertion hole,

The middle part of the terminal is fixed on the upper part of the insertion hole,

The width of the lower part of the insertion hole is larger than the width of the upper part of the insertion hole.

11. The motor of any one of claims 2 to 10, wherein,

The wire has:

a first lead portion extending axially upward from the coil;

a second lead portion extending from an upper end portion of the first lead portion toward a position below the axial direction of the connection terminal; and

a third lead portion extending axially upward from a distal end portion of the second lead portion,

The upper end of the third lead portion is connected to the lower end of the connection terminal,

The sum of the length of the second lead wire portion and the length of the third lead wire portion is longer than the distance between the upper end portion of the first lead wire portion and the upper end portion of the third lead wire portion.

12. A method of manufacturing a motor having a coil arranged inside a casing and a metal connection terminal, wherein:

The manufacturing method of the motor has the following steps:

a), connecting the connection terminal with the end of the wire of the coil;

b), inserting the connection terminal into a bearing holder constituting the upper surface of the housing; and

c), pulling up the connection terminal relative to the bearing cage.