CN112564425A

CN112564425A - Motor and motor assembling method

Info

Publication number: CN112564425A
Application number: CN202011021818.3A
Authority: CN
Inventors: 神里良; 吉川雅训; 水谷贵之
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-09-25
Filing date: 2020-09-25
Publication date: 2021-03-26
Also published as: JP2021052493A

Abstract

A motor and a method of assembling the motor are provided, in which a motor shaft extends in an axial direction. The motor rotor rotates at the same rotational speed as the motor shaft. The housing houses the motor shaft and the motor rotor. The resolver unit detects a rotational position of the motor rotor. The housing has a 1 st housing part and a 2 nd housing part arranged in an axial direction. The resolver unit has a resolver stator, a resolver rotor, and a frame. The resolver rotor rotates at the same rotational speed as the motor shaft, and is disposed facing the resolver stator in the radial direction. The frame holds the resolver stator. The frame is sandwiched between the 1 st and 2 nd housing parts in the axial direction.

Description

Motor and motor assembling method

Technical Field

The present invention relates to a motor and a method of assembling the motor.

Background

Conventionally, a resolver is known as a mechanism for detecting rotation of a motor. In the case of using a resolver, the resolver stator needs to be fixed with respect to the housing. Japanese patent No. 4613544 discloses a fixing structure of the stator of the resolver.

In the stator fixing structure of the resolver described in japanese patent No. 4613544, a stator (13) is fixed to a housing (11) as a bearing holder.

However, in the structure described in japanese patent No. 4613544, since the housing (11) is rotatable in the circumferential direction, it is difficult to fix the housing (11) to the mounting object when the resolver (a) is mounted to the mounting object. In particular, it is very difficult to fix the stator (13) to the object to be attached while maintaining the position in the circumferential direction at an appropriate position with respect to the position in the circumferential direction of the rotor (19).

Disclosure of Invention

The invention aims to provide a motor and a motor assembling method, wherein the circumferential position of a resolver stator can be easily adjusted relative to the circumferential position of the motor stator.

The problems to be solved by the present invention are as described above, and means for solving the problems are described below.

According to an aspect of the present invention, there is provided a motor having a motor shaft, a motor rotor, a casing, and a resolver unit. The motor shaft extends in an axial direction. The motor rotor rotates at the same rotational speed as the motor shaft. The housing houses the motor shaft and the motor rotor. The resolver unit detects a rotational position of the motor rotor. The housing has a 1 st housing part and a 2 nd housing part arranged in an axial direction. The resolver unit has a resolver stator, a resolver rotor, and a frame. The resolver rotor rotates at the same rotational speed as the motor shaft, and is disposed to be radially opposed to the resolver stator. The frame holds the resolver stator. The frame is sandwiched between the 1 st and 2 nd housing parts in an axial direction.

According to another aspect of the present invention, there is provided an assembling method of a motor. The motor has a motor shaft, a motor rotor, a housing, and a resolver unit. The motor shaft extends in an axial direction. The motor rotor rotates at the same rotational speed as the motor shaft. The housing houses the motor shaft and the motor rotor. The resolver unit detects a rotational position of the motor rotor. The housing has a 1 st housing part and a 2 nd housing part aligned in a direction. The resolver unit has a resolver stator, a resolver rotor, and a frame. The resolver rotor rotates at the same rotational speed as the motor shaft, and is disposed to be radially opposed to the resolver stator. The frame holds the resolver stator. The motor assembly method includes the following steps a) to e). In the step a), the resolver stator is fixed to the frame. In the step b), the frame is disposed on one axial side of the 1 st shell member, and the 2 nd shell member is disposed on one axial side of the frame. In the step c), fixing screws are inserted into the 1 st shell member, the long hole extending in the circumferential direction provided in the frame, and the through hole of the 2 nd shell member. In the step d), the circumferential position of the resolver stator is adjusted by rotating the frame in the circumferential direction. In step e), the frame is fixed to the 1 st and 2 nd casing members by fastening the fixing screws.

According to the aspect of the present invention, the circumferential position of the resolver stator can be easily adjusted with respect to the circumferential position of the motor stator.

Drawings

Fig. 1 is a longitudinal sectional view of the motor.

Fig. 2 is a view of the motor as viewed from the radially outer side.

Fig. 3 is a view of the motor as viewed from the radially outer side.

Fig. 4 is a partially enlarged longitudinal sectional view of the motor.

Fig. 5 is a perspective view of the bus bar unit.

Fig. 6 is a view of the 2 nd housing part, the resolver unit, and the frame as viewed in the axial direction.

Fig. 7 is a perspective view of the frame.

Fig. 8 is a view of the 2 nd housing part, the resolver unit, and the frame of the modification as viewed in the axial direction.

Detailed Description

Hereinafter, exemplary embodiments of the present application 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 shapes and positional relationships of the respective portions will be described with the axial direction as the vertical direction and the bus bar unit side as the upper side with respect to the stator. However, the orientation of the motor of the present invention during manufacturing and during use is not intended to be limited by the definition of the vertical direction.

The "parallel direction" also includes a substantially parallel direction. The "vertical direction" also includes a substantially vertical direction. The "direction along the arc" also includes a direction substantially along the arc.

< 1. integral structure of motor

Fig. 1 is a longitudinal sectional view of a motor 1 according to an embodiment of the present application. The motor 1 of the present embodiment is mounted on, for example, an automobile and used as a drive source for generating a drive force for the power steering apparatus. However, the motor of the present application may be used for applications other than power steering. For example, the motor of the present application may be used as a drive source for other parts of an automobile, such as an engine cooling fan and 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 generate various driving forces.

As shown in fig. 1, the motor 1 includes a stationary portion 2 and a rotating portion 3. The stationary unit 2 is fixed to a housing of a device to be driven. The rotating portion 3 is rotatably supported by the stationary portion 2.

The stationary portion 2 of the present embodiment mainly includes a housing 21, a stator 22, a bus bar unit 23, a lower bearing 24, and an upper bearing 25.

The housing 21 has a 1 st housing part 211 and a 2 nd housing part 212. The 1 st housing member 211 includes a 1 st cylindrical portion 213 and a bottom plate portion 214. The 1 st cylindrical portion 213 extends in a substantially cylindrical shape in the axial direction on the radially outer side of the stator 22 and the bus bar unit 23. The bottom plate portion 214 expands radially inward from the lower end of the 1 st cylindrical portion 213. The bottom plate portion 214 is substantially annular when viewed in the axial direction, and extends substantially perpendicular to the central axis 9 below the stator 22 and a motor rotor 32 described later. The stator 22, the bus bar unit 23, and a motor rotor 32 described later are housed in the internal space of the 1 st housing member 211.

Fig. 2 is a view of the motor 1 as viewed from the radially outer side. As shown in fig. 2, the 1 st case member 211 has ear portions 219 protruding radially outward from a part of the circumferential direction of the axial upper end of the 1 st cylindrical portion 213. A plurality of the ear portions 219 are provided at intervals in the circumferential direction. In the present embodiment, three ear portions 219 are provided at intervals in the circumferential direction of the 1 st cylindrical portion 213. Each of the lug portions 219 is provided with a screw hole 219a penetrating in the axial direction.

The 1 st cylindrical portion 213 of the 1 st case member 211 has a 1 st fixing portion 91 projecting radially outward. The 1 st fixing portion 91 is fixed to the 1 st mounting plate 101. The 1 st mounting board 101 is mounted on a device as a mounting object.

Returning to fig. 1. The 2 nd housing member 212 includes a 2 nd cylindrical portion 215 and a cover portion 216. The 2 nd cylindrical portion 215 extends substantially cylindrically in the axial direction on the outside in the radial direction of the upper bearing 25. The cover 216 is radially inwardly expanded from the upper end of the 2 nd cylindrical portion 215. The lid portion 216 is substantially annular in shape when viewed in the axial direction, and extends substantially perpendicular to the central axis 9 at a position above the resolver unit 7 to be described later. The upper bearing 25 is received in the inner space of the 2 nd housing member 212. The material of the 1 st and 2

nd housing parts

211 and 212 may be resin, or may be metal such as aluminum or stainless steel.

As shown in fig. 2, the 2 nd housing member 212 has ear portions 218 projecting radially outward from a part of the circumferential direction of the axial lower end portion of the 2 nd cylindrical portion 215. The plurality of ears 218 are provided at intervals in the circumferential direction. In the present embodiment, three ear portions 218 are provided at intervals in the circumferential direction of the 2 nd cylindrical portion 215. Each ear 218 is provided with a through hole 218a penetrating in the axial direction.

As shown in fig. 3, the 2 nd case member 212 has a case-side cutout portion 212a in a part of the circumferential direction of the axial lower end portion of the 2 nd cylindrical portion 215. The outer shape of the housing-side cutout portion 212a is substantially rectangular. The case-side cutout 212a of the present embodiment is open toward the 1 st case member 211.

As shown in fig. 2, the 2 nd cylindrical portion 215 of the 2 nd housing member 212 has a 2 nd fixing portion 92 protruding radially outward. The 2 nd fixing portion 92 is fixed to the 2 nd mounting plate 102. The 2 nd mounting plate 102 is mounted on a device to be mounted.

Returning to fig. 1. The stator 22 is disposed radially outward of a motor rotor 32 described later. The stator 22 has a stator core 41, a plurality of insulators 42, and a plurality of coils 43. The stator core 41 is formed of a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction. The stator core 41 includes an annular core back 411 and a plurality of teeth 412 protruding radially inward from the core back 411. The core back 411 is arranged substantially coaxially with the central axis 9. Further, the outer peripheral surface of the core back 411 is fixed to the inner peripheral surface of the 1 st cylindrical portion 213 of the 1 st case member 211. The plurality of teeth 412 are arranged at substantially equal intervals in the circumferential direction.

The insulating member 42 is made of resin as an insulator. The stator 22 of the present embodiment has an insulator 42 on each tooth. At least a part of the surface of the stator core 41 is covered with an insulator 42. Specifically, at least the upper surface, the lower surface, and the circumferential both end surfaces of each tooth 412 of the surface of the stator core 41 are covered with the insulator 42. Each of the insulators 42 has a 1 st resin part 421 and a 2 nd resin part 422. The 2 nd resin member 422 is located below the 1 st resin member 421. The 1 st resin member 421 is attached to the stator core 41 from the upper surface side of the stator core 41. The 2 nd resin member 422 is attached to the stator core 41 from the lower surface side of the stator core 41.

The coil 43 is constituted by a wire 430 wound around the insulator 42. That is, in the present embodiment, the lead wire 430 is wound around the teeth 412 serving as the magnetic core via the insulator 42. The insulator 42 prevents the teeth 412 from being electrically short-circuited with the coil 43 by being interposed between the teeth 412 and the coil 43.

The bus bar unit 23 is located between the stator core 41 and a resolver unit 7 described later in the axial direction. The bus bar unit 23 includes a bus bar 51 made of metal such as copper as a conductor and a resin-made bus bar holder 81 for holding the bus bar 51. The bus bar 51 is electrically connected to an end of the wire 430 constituting the coil 43. In addition, when the motor 1 is used, an external power supply is connected to the bus bar 51. That is, the coil 43 and the external power supply are electrically connected via the bus bar 51.

The lower bearing 24 and the upper bearing 25 are disposed between the housing 21 and the motor shaft 31 on the rotating portion 3 side. The lower bearing 24 of the present embodiment uses a rolling bearing. In addition, the upper bearing 25 of the present embodiment uses a slide bearing. The outer race of the lower bearing 24 is fixed to the bottom plate portion 214 of the 1 st housing member 211. Further, the inner race of the lower bearing 24 is fixed to the motor shaft 31. The outer peripheral surface of the upper bearing 25 is slidable in the circumferential direction with respect to the cover portion 216 of the 2 nd housing member 212. The inner peripheral surface of the upper bearing 25 is slidable in the circumferential direction with respect to the motor shaft 31. Thereby, the motor shaft 31 is rotatably supported on the housing 21. However, the form of the bearing is not particularly limited, and another form of bearing such as a fluid bearing may be used instead of the above form.

The rotating portion 3 of the present embodiment mainly includes a motor shaft 31 and a motor rotor 32.

The motor shaft 31 is a substantially cylindrical member. The motor shaft 31 is disposed coaxially with the center axis 9 and extends along the center axis 9. As a material of the motor shaft 31, for example, a metal such as stainless steel is used. The motor shaft 31 rotates about the center axis 9 while being supported by the lower bearing 24 and the upper bearing 25. The lower end of the motor shaft 31 protrudes downward from the bottom plate 214. A device to be driven is connected to the lower end of the motor shaft 31 via a power transmission mechanism including a gear and the like. The motor shaft 31 may be a solid member.

The motor rotor 32 is located radially inside the stator 22, and rotates at the same rotational speed in the same direction as the motor shaft 31. The motor rotor 32 includes a rotor core 61, a plurality of magnets (not shown), and a magnet holder (not shown). The rotor core 61 is formed of a laminated steel sheet in which electromagnetic steel sheets are laminated in the axial direction. The rotor core 61 has a through hole 60 extending in the axial direction in the axial center portion. The motor shaft 31 is press-fitted into the through hole 60 of the rotor core 61. Thereby, the rotor core 61 and the motor shaft 31 are fixed to each other. Further, a member such as a bush may be disposed between the inner surface constituting the through hole 60 and the outer surface of the motor shaft 31. That is, the motor shaft 31 and the rotor core 61 may be directly fixed or indirectly fixed.

The plurality of magnets are fixed to the outer periphery of the rotor core 61 using, for example, an adhesive. The radially outer surface of each magnet serves as a magnetic pole surface facing the radially inner end surface of the tooth 412. The plurality of magnets are arranged in a circumferential direction such that N poles and S poles are alternately arranged. Instead of a plurality of magnets, one annular magnet in which N-poles and S-poles are alternately magnetized in the circumferential direction may be used. The magnets may be embedded in the rotor core 61.

The magnet holder is a resin-made member fixed to the rotor core 61. The magnet holder is obtained by insert molding of the rotor core 61 as an insert member, for example. The plurality of magnets are positioned in the circumferential direction and the axial direction by being in contact with the magnet holder, respectively. Further, the rigidity of the entire motor rotor 32 is improved by the magnet holder. The plurality of magnets may be fixed to the rotor core 61 by a mold using resin, or may be indirectly fixed to the rotor core 61 by using another member.

When a drive current is supplied from an external power supply to the coil 43 via the bus bar 51, magnetic flux is generated in the plurality of teeth 412 of the stator core 41. Then, a circumferential torque is generated by the action of the magnetic flux between the teeth 412 and the magnets. As a result, the rotating portion 3 rotates about the central axis 9 with respect to the stationary portion 2.

< 2. Structure of bus bar Unit

The structure of the bus bar unit 23 will be described below with reference to fig. 4 and 5. Fig. 4 is a longitudinal sectional view of the bus bar unit 23 and its peripheral components. Fig. 5 is a perspective view of the bus bar unit 23.

As shown in fig. 4 and 5, the bus bar unit 23 includes a bus bar holder 81, a bus bar 51, and a magnetic shield 83.

The bus bar holder 81 is a substantially annular member when viewed in the axial direction. The bus bar holder 81 includes a main body 810, a lead bush 811, and a leg 813. The body 810 is a substantially annular portion having a constant thickness in the axial direction. The lead bushing 811 protrudes radially outward from the outer peripheral portion of a part of the body 810 in the circumferential direction. As shown in fig. 5, the lead bush portion 811 is substantially rectangular when viewed from the axial direction. When the motor 1 is used, the radially outer end of the lead bush portion 811 is positioned outside the casing 21. The 1 st external connection terminals 815 extend outward from the radially outward long side of the four rectangular sides of the lead bush portion 811. The 1 st external connection terminals 815 are arranged in a planar manner at regular intervals. When the motor 1 is used, the 1 st external connection terminal 815 is connected to an external power supply. The 1 st external connection terminals 815 are connected to any one of the bus bars 51 described later.

The plurality of leg portions 813 are provided on the outer periphery of the main body portion. The leg 813 projects radially outward from the body 810, and has a tip extending axially downward. The leg portions 813 are supported by the core back portion 411 by inserting the tip end portions into slots (not shown) provided in the core back portion 411.

The bus bar unit 23 of the present embodiment has a plurality of bus bars 51. Each bus bar 51 has a conduction portion 510 and a terminal portion 511. The conductive portion 510 has a plate shape of an arc shape or an annular shape. The plurality of conductive portions 510 are arranged so as not to overlap each other when viewed in the axial direction. The conduction portion 510 is held as an insert member in the main body portion 810 of the bus bar holder 81. One end of the terminal portion 511 is connected to each conductive portion 510.

The terminal portion 511 is a substantially linear portion made of metal. The terminal portions 511 extend in the radial direction from the conduction portions 510. The terminal portion 511 has a U-shaped connecting portion 511U at the other end for connecting the tip end of the lead wire 430 serving as the lead wire of the coil 43.

Further, one end of the 1 st external connection terminal 815 is connected to the conductive portion 510. The other end of the 1 st external connection terminal 815 has a U-shaped connection portion 815U similar to the connection portion 511U of the terminal portion 511. The connection portion 815u is used to connect to an external power source when the motor 1 is used.

Further, the bus bar unit 23 of the present embodiment has a magnetic shield 83. The magnetic shield 83 has a substantially annular plate shape. The magnetic shield 83 is made of an iron alloy such as SECC. The magnetic shield 83 is disposed so as to cover the plurality of conductive portions 510 when viewed from the upper side in the axial direction. The magnetic shield 83 is held as an insert member inside the main body portion 810 of the bus bar holder 81.

< 3. Structure of resolver cell

Further, the motor 1 of the present embodiment includes a resolver unit 7 for detecting the rotation angle of the motor rotor 32. As shown in fig. 4, 6, and 7, the resolver unit 7 includes a resolver rotor 71, a resolver stator 72, a resolver connector 74, and a frame 73.

The resolver rotor 71 shown in fig. 4 is a part of the rotating portion 3. The resolver rotor 71 is a substantially cylindrical member, and is located in the vicinity of the boundary between the 1 st housing member 211 and the 2 nd housing member 212 in the internal space. The resolver rotor 71 is located radially outside the motor shaft 31 coaxially with the center axis 9. The resolver rotor 71 is fixed to the motor shaft 31. Therefore, the resolver rotor 71 rotates at the same rotation speed in the same direction as the motor shaft 31.

The resolver stator 72 is a part of the stationary part 2. The resolver stator 72 is located radially outside the resolver rotor 71. That is, the resolver stator 72 and the resolver rotor 71 are disposed to face each other in the radial direction. The resolver stator 72 is formed in a substantially annular shape by laminating disk-shaped electromagnetic steel plates in the axial direction. A plurality of conductive wires for excitation and detection are wound around the vicinity of the radially inner end of the resolver stator 72 to form a coil portion 721.

Fig. 6 is a view of the 2 nd housing part 212, the resolver unit 7, and the frame 73 as viewed from the lower side in the axial direction. As shown in fig. 6, the resolver connector 74 protrudes radially outward from the outer peripheral portion of the resolver stator 72. The resolver connector 74 is substantially rectangular when viewed in the axial direction. When the motor 1 is used, the radially outer end of the resolver connector 74 is located outside the housing 21. Among the four sides of the rectangular shape of the resolver connector 74, the radially outward long side has a plurality of 2 nd external connection terminals (not shown) arranged in a planar manner with a constant interval. When the motor 1 is used, the 2 nd external connection terminal is connected to an external power supply. The 2 nd external connection terminals are connected to any one of the coil portions of the resolver stator 72.

Fig. 7 is a perspective view of the frame 73. Frame 73 holds resolver stator 72. As shown in fig. 4, the outer peripheral surface of the resolver stator 72 is fixed to the inner peripheral surface of the housing 21 via a frame 73. The detailed structure of the frame 73 will be described later.

In the motor having the above configuration, a phase difference may occur between an induced voltage of the motor and a resolver signal due to a variation generated at the time of assembly. Such a phase difference can be eliminated by software by adjusting parameters of a control unit of a device (driving object) having a motor mounted thereon, for example. However, it is assumed that the motor of the present embodiment is used in combination with a device as a driving target at random after the fact. Therefore, it is preferable to mechanically cancel the phase difference before mounting the motor on the device, as compared with a case where the phase difference is canceled by software after mounting the motor on the device.

In this regard, the motor 1 of the present embodiment has a unique configuration as follows: before being mounted on the apparatus, the circumferential position of the resolver stator 72 can be easily adjusted with respect to the circumferential position of the resolver rotor 71. Hereinafter, the specific structure of the present application will be described in detail.

< 4. detailed construction of frame >

As shown in fig. 7, the frame 73 of the present embodiment includes a body portion 73a, a step portion 73b, a rib 73c, an ear portion 73d, an elongated hole 73e, and a frame-side cutout portion 73 f.

The body 73a is a substantially cylindrical portion extending in the axial direction coaxially with the central axis 9. The step portion 73b is provided on the inner peripheral portion of the body portion 73 a. The step portion 73b has a step surface extending annularly perpendicularly to the axial direction. The rib 73c protrudes radially outward from the axial middle portion of the body 73 a. The rib 73c has an annular plate shape. The ear portion 73d protrudes outward in the radial direction from a part of the rib portion 73c in the circumferential direction. The plurality of ear portions 73d are provided at intervals in the circumferential direction. In the present embodiment, three ear portions 73d are provided at intervals in the circumferential direction of the body portion 73 a.

The long hole 73e axially penetrates the lug portion 73 d. The long hole 73e extends linearly in the longitudinal direction along the circumferential direction when viewed in the axial direction. In other words, the long hole 73e extends along a tangent of the rib 73 c. A fixing screw 99 described later is inserted into the elongated hole 73 e. The fixing screw 99 of the present embodiment is relatively movable within an angular range of 4.6 ° about the central axis 9 in the elongated hole 73 e. However, the range of angles in which the fixing screws can move relative to each other is not limited to 4.6 °, and may be a range narrower or wider than this.

The frame-side cutout 73f is provided in a part of the body 73a of the frame 73 in the circumferential direction. The frame-side cutout 73f has a substantially rectangular outer shape. The frame-side cutout 73f of the present embodiment is open toward the 1 st housing member 211. The size of the frame-side cutout 73f in the circumferential direction substantially matches the size of the resolver connector 74 in the circumferential direction.

Further, the dimension in the circumferential direction of the case-side cutout portion 212a of the 2 nd case member 212 is larger than the dimension in the circumferential direction of the frame-side cutout portion 73 f. Therefore, the dimension in the circumferential direction of the housing-side cutout portion 212a is larger than the dimension in the circumferential direction of the rotary transformer connector 74. As shown in fig. 3, the resolver connector 74 is inserted into the frame-side cutout 73f and the housing-side cutout 212 a.

< 5. method for assembling motor

Hereinafter, a method of assembling the motor 1 will be described in detail.

First, the resolver stator 72 is fixed to the frame 73. Specifically, the axial upper end surface of the resolver stator 72 is brought into contact with the stepped surface, and the axial upper outer edge of the resolver stator 72 is disposed at the corner of the stepped portion 73 b. At the same time, the resolver connector 74 is housed in the frame-side cutout 73 f. Thereby, the resolver unit 7 is positioned with respect to the frame 73. In this state, the resolver stator 72 is caulked and fixed to the frame 73. Specifically, the lower end of the frame 73 is bent radially inward, and the resolver stator 72 is fixed between the bent lower end and the step portion 73 b.

Next, the frame 73 is disposed axially above the 1 st case member 211 in a state in which the components are housed in the internal space, and the 2 nd case member 212 in a state in which the components are housed in the internal space is disposed axially above the frame 73.

Next, the shaft portions of the fixing screws 99 are inserted into the through holes 218a of the ear portions 218 of the 2 nd housing member 212, the elongated holes 73e of the ear portions 73d of the frame 73, and the screw holes 219a of the ear portions 219 of the 1 st housing member 211 with the head portions thereof directed upward in the axial direction. Thereby, the 1 st housing member 211 and the 2 nd housing member 212 are temporarily fixed with the rib portion 73c of the frame 73 sandwiched therebetween.

Next, the jig is applied to the rib 73c of the frame 73 from the radially outer side, whereby the frame 73 is rotated in the circumferential direction with respect to the 1 st housing member 211 and the 2 nd housing member 212. Thereby, the circumferential position of the resolver stator 72 with respect to the resolver rotor 71 is adjusted. At this time, a test of the output of the resolver unit 7 is performed, and adjustment is performed so as to approach a state where the phase difference between the induced voltage of the motor and the resolver signal is small.

Next, the fixing screws 99 are fastened to the screw holes 219a, whereby the frame 73 is fixed to the 1 st and 2

nd housing members

211 and 212.

The motor 1 assembled in this way is fixed to a device (an object to be mounted) via the 1 st mounting plate 101 and the 2 nd mounting plate 102 when the motor 1 is used. Thus, the motor 1 is mounted on the device as the mounting object in a stable state.

< 6. summarization >

As described above, the motor 1 of the present embodiment includes the motor shaft 31, the motor rotor 32, the housing 21, and the resolver unit 7. The housing 21 has a 1 st housing part 211 and a 2 nd housing part 212. The resolver unit 7 has a resolver stator 72, a resolver rotor 71, and a frame 73. Frame 73 holds resolver stator 72. The frame 73 is sandwiched between the 1 st housing part 211 and the 2 nd housing part 212 in the axial direction. Thereby, the resolver stator 72 is held by the frame 73, and the frame 73 is held by being sandwiched between the 1 st housing part 211 and the 2 nd housing part 212, whereby the shape of the inside of the housing 21 can be simplified. Further, since the resolver stator 72 is not directly screwed to the housing 21 inside the housing 21, the axial dimension of the motor 1 can be reduced. Further, by holding the frame 73 at an appropriate rotational position with respect to the housing 21, the circumferential position of the resolver stator 72 can be adjusted.

The motor 1 of the present embodiment has a fixing screw 99. The frame 73 has an elongated hole 73e extending in the circumferential direction. As shown in fig. 6, the fixing screw 99 penetrates the elongated hole 73 e. The frame 73 is rotatable circumferentially relative to the 1 st and 2

nd housing parts

211 and 212. Thus, the position of the resolver stator 72 in the circumferential direction can be adjusted by rotating the frame 73 along the elongated hole 73 e. As a result, torque ripple and the like of the motor 1 can be suppressed.

As shown in fig. 2, in the motor 1 of the present embodiment, the 1 st housing member 211 has the 1 st fixing portion 91 fixed to the 1 st mounting plate 101. The 2 nd housing member 212 has a 2 nd fixing portion 92 fixed to the 2 nd mounting plate 102. The 1 st mounting board 101 and the 2 nd mounting board 102 are fixed to a device to be mounted. Thus, both the 1 st housing part 211 and the 2 nd housing part 212 are fixed to the apparatus as the mounting object by the respective mounting plates 101(102), whereby the motor 1 is mounted to the apparatus in a more stable state. As a result, the motor 1 can be driven with high accuracy.

As shown in fig. 2 and 3, in the motor 1 of the present embodiment, the frame 73 is exposed to the outside when viewed in the radial direction. Thus, for example, a jig or the like is applied to the frame 73 to rotate the frame 73 in the circumferential direction, thereby adjusting the phase of the resolver stator 72.

In the motor 1 of the present embodiment, the resolver unit 7 includes a resolver connector 74. The frame 73 has a frame-side cutout 73 f. The resolver connector 74 is inserted into the frame-side cutout portion 73 f. This allows the resolver connector 74 to be drawn out to the outside with a simple configuration. As a result, the motor 1 can be downsized in the axial direction.

As shown in fig. 3, in the motor 1 of the present embodiment, the 2 nd housing member 212 has a housing-side cutout portion 212 a. The resolver connector 74 is inserted into the housing-side cutout portion 212 a. This eliminates the need to axially draw out the wiring extending from the resolver connector 74, and therefore, the motor 1 can be prevented from being increased in size.

In addition, in the motor 1 of the present embodiment, the size of the case-side cutout portion 212a in the circumferential direction is larger than the size of the frame-side cutout portion 73f in the circumferential direction. Thus, the frame-side cutout 73f and the resolver connector 74 are integrated with the resolver stator 72, and can move in the circumferential direction within the range of the housing-side cutout 212 a. As a result, the phase adjustment is easily performed after the resolver unit 7 and the 2 nd housing part 212 are assembled.

< 7. modification

< 7-1. Structure of motor of modification

Hereinafter, the motor 1 of the modified example will be described with reference to fig. 8. Fig. 8 is a view of the 2 nd housing part 212, the resolver unit 7, and the frame 73 of a modification example as viewed from the lower side in the axial direction. In the following description, the same components as those in the above-described embodiments are denoted by the same reference numerals, and redundant description thereof is omitted.

The frame 73 of the modification includes a body 73a, a step 73b, a rib 73c, an ear 73d, a long hole 73e, and a frame-side cutout 73f, and also includes a projection 73 g.

The protruding portion 73g is located on one side in the circumferential direction of one long hole 73e of the plurality of long holes 73 e. The radial width of the protruding portion 73g and the rib 73c is larger than the radial width of the rib 73c on the other circumferential side of the long hole 73 e. The protruding portion 73g protrudes radially outward from the 1 st housing part 211 and the 2 nd housing part 212 as viewed in the axial direction. Thus, after temporarily fixing the housing 21 and the frame 73, the user can grip the protruding portion 73g of the frame 73 to adjust the phase of the resolver stator 72. The protruding portion 73g also functions as a portion covering the lead bush portion 811 from above.

< 7-2. summary >

As described above, in the motor 1 of the modified example, the frame 73 is exposed radially outward of the 1 st housing part 211 and the 2 nd housing part 212. By exposing the frame 73 to the outside in the radial direction of the housing 21 in this way, the phase adjustment can be easily performed in a state where the 1 st housing member 211, the frame 73, and the 2 nd housing member 212 are assembled.

In the motor 1 of the modification, the frame 73 has a protruding portion 73g on one circumferential side of the elongated hole 73e, the protruding portion 73g has a radial width larger than a radial width of the elongated hole 73e on the other circumferential side, and the protruding portion 73g protrudes radially outward from the 1 st and 2

nd case members

211 and 212. Thus, for example, after the 1 st housing part 211, the frame 73, and the 2 nd housing part 212 are assembled, the user can grip the protruding portion 73g of the frame 73 to adjust the phase of the resolver stator 72.

The motor 1 of the modification includes the stator core 41, the coil 43, and the bus bar unit 23. The bus bar unit 23 has a lead bush portion 811. The lead bush portion 811 is covered by the protruding portion 73g of the frame 73. Thus, the protruding portion 73g of the frame 73 functions not only as a portion to be gripped at the time of phase adjustment but also as a portion to cover the lead bush portion 811. As a result, the number of components can be reduced.

< 8. other modification example

The present invention is not limited to the above embodiments, but an exemplary embodiment of the present invention is described above.

In the above embodiment, the long hole 73e of the frame 73 linearly extends along the circumferential direction, but is not limited thereto. Instead of this, the long hole of the frame may extend in an arc shape along the circumferential direction.

In the above embodiment, 3 long holes 73e are arranged at intervals in the circumferential direction in the frame 73, but the number of long holes is not limited to this. Instead of this, the number of the long holes may be 1, 2, or 4 or more.

In the above embodiment, the frame-side cutout 73f is open to the 1 st case member 211 side, but is not limited thereto. Instead of this, the frame-side cutout may be opened to the 2 nd housing member side.

In the above modification, the protruding portion 73g is disposed on one side in the circumferential direction of one long hole 73e of the plurality of long holes 73e of the frame 73, but is not limited thereto. Instead of this, the protruding portion may be disposed on one side in the circumferential direction of each of the plurality of long holes. Alternatively, the frame may be provided with a projection over the entire circumference thereof.

In the above embodiment, the resolver rotor 71 is a substantially cylindrical member, but is not limited thereto. Instead of this, for example, the resolver rotor may have a shape having a concave-convex shape on the side surface of the cylinder. Alternatively, the resolver rotor may be formed in a cylindrical shape in which an ellipse extends in the axial direction.

In the above embodiment, the magnetic shield 83 is molded on the bus bar holder 81 as an insert member together with the conduction part 510 of the bus bar 51. However, instead of this, for example, the magnetic shield may be insert-molded to the bus bar holder made of resin, and a part of the magnetic shield may be exposed from the bus bar holder.

Alternatively, the magnetic shield may be fixed to the bus bar holder made of resin by clamping or the like.

In addition, the respective elements appearing in the above embodiment and the modified examples may be appropriately combined within a range in which contradiction does not occur.

The present invention can be used for a motor and a method of assembling the motor, for example.

Claims

1. A motor, wherein,

the motor has:

a motor shaft extending in an axial direction;

a motor rotor that rotates at the same rotational speed as the motor shaft;

a housing that houses the motor shaft and the motor rotor; and

a resolver unit that detects a rotational position of the motor rotor,

the housing has a 1 st housing part and a 2 nd housing part arranged in an axial direction,

the resolver unit includes:

a resolver stator;

a resolver rotor that rotates at the same rotational speed as the motor shaft and is disposed to face the resolver stator in a radial direction; and

a frame holding the resolver stator,

the frame is sandwiched between the 1 st and 2 nd housing parts in an axial direction.

2. The motor of claim 1,

the motor further has a fixing screw extending in an axial direction and fastened to the 1 st and 2 nd casing members,

the frame has an elongated hole extending in the circumferential direction,

the fixing screw penetrates through the long hole,

the frame is circumferentially rotatable relative to the 1 st and 2 nd housing parts.

3. The motor of claim 2,

the 1 st housing part has a 1 st fixing portion fixed to a 1 st mounting plate,

the 2 nd housing part has a 2 nd fixing portion fixed to the 2 nd mounting plate,

the 1 st mounting plate and the 2 nd mounting plate are fixed to an object to be mounted.

4. The motor according to claim 2 or 3,

the frame is exposed to the outside when viewed in the radial direction.

5. The motor according to claim 2 or 3,

the frame is exposed to a radially outer side of the 1 st and 2 nd housing parts.

6. The motor of claim 5,

the frame has a protruding portion on one circumferential side of the elongated hole, the protruding portion having a radial width larger than a radial width of the other circumferential side of the elongated hole and protruding radially outward than the 1 st and 2 nd shell members.

7. The motor of claim 6,

the motor further has:

a stator core disposed inside the motor case, the stator core having an annular core back portion and a plurality of teeth extending radially inward from the core back portion;

coils wound around the plurality of teeth, respectively; and

and a bus bar unit electrically connecting the plurality of coils and the No. 1 external connection terminal, and having a lead bushing portion.

8. The motor of claim 7,

the protruding portion of the frame covers the lead bush portion.

9. The motor of claim 7,

the resolver unit includes a resolver connector electrically connecting the coil portion of the resolver stator and a 2 nd external connection terminal,

the frame has a frame-side cutout portion that opens to the 1 st shell side or the 2 nd shell side,

the resolver connector is inserted into the frame-side cutout.

10. The motor of claim 9,

the 2 nd housing has a housing-side cutout portion opened to the 1 st housing side,

the resolver connector is inserted into the housing-side cutout portion.

11. The motor of claim 10,

the size of the housing-side cutout portion in the circumferential direction is larger than the size of the frame-side cutout portion in the circumferential direction.

12. A method for assembling a motor, which assembles the motor,

the motor has:

a motor shaft extending in an axial direction;

a motor rotor that rotates at the same rotational speed as the motor shaft;

a housing that houses the motor shaft and the motor rotor; and

a resolver unit that detects a rotational position of the motor rotor,

the resolver unit includes:

a resolver stator;

a frame holding the resolver stator,

the assembling method of the motor comprises the following steps:

a) securing the resolver stator to the frame;

b) disposing the frame on one axial side of the 1 st housing part, and disposing the 2 nd housing part on one axial side of the frame;

c) inserting a fixing screw into the 1 st housing, a long hole extending in a circumferential direction provided in the frame, and a through hole of the 2 nd housing;

d) rotating the frame in a circumferential direction to adjust a position of the resolver stator in the circumferential direction; and

e) the frame is fixed with respect to the 1 st and 2 nd casing members by fastening the fixing screws.