JP7425926B2 - Motor structure and motor manufacturing method - Google Patents

Description

The present invention relates to a motor structure and a motor manufacturing method.

BACKGROUND ART Conventionally, a motor including a rotor fixed to a rotating shaft is known (for example, see Patent Document 1). The motor disclosed in Patent Document 1 includes a cylindrical rotor fixed to a motor output shaft and a stator disposed around the outer periphery of the rotor. The rotor includes a cylindrical inner rotor body (hereinafter also referred to as "rotor boss") and a magnet provided on the outer peripheral surface of the rotor boss. The rotor boss is press-fitted into the magnet. When the rotor has a rotor boss, the rotor can be assembled by gripping the rotor using a gripping structure provided on the rotor boss.

Patent No. 6773623

By the way, in order to reduce the number of parts, it is required to eliminate the rotor boss. If the rotor boss is abolished, it will be necessary to devise a way to grip the rotor when assembling the rotor, but there will be a problem in that the number of parts will increase.

An object of the present invention is to make it possible to assemble a rotor while reducing the number of parts.

A motor structure according to one aspect of the present invention includes a cylindrical rotor (10) fixed to a rotating shaft (3), and the rotor (10) is arranged in an axial direction along an axis (C) of the rotor (10). has a through hole (32) passing through the rotor (10), and the through hole (32) has an arc shape centered on the rotation center of the rotor (10) when viewed from the axial direction. There is.
According to this configuration, the through hole has an arc shape centered on the rotation center of the rotor when viewed from the axial direction, so that a jig or the like can be inserted into the through hole and rotated around the rotation center of the rotor. This allows the rotor to be gripped by a jig or the like. In addition, since there is no need to provide a rotor boss for gripping the rotor, the number of parts can be reduced. Therefore, the rotor can be assembled while reducing the number of parts.

In the motor structure according to one aspect of the present invention, the rotating shaft (3) has a shaft-side recess (3a) recessed radially inward from the outer periphery of the rotating shaft (3), or an outer periphery of the rotating shaft (3). The rotor (10) has a rotor-side protrusion (11a) that protrudes radially inward from the inner periphery of the rotor (10), or a rotor-side recess (11b) recessed radially outward from the inner periphery of the rotor (10), and the shaft-side recess (3a) and the rotor-side protrusion (11a) engage with each other; Rotation of the rotor (10) about the rotating shaft (3) may be restricted by the shaft-side convex portion (3b) and the rotor-side recessed portion (11b) engaging with each other.
According to this configuration, the rotation of the rotor around the rotation axis is restricted by the engagement structure having concave and convex parts, so no press-fitting process or press-fitting machine is required when assembling the rotor, reducing manufacturing costs. can do. In addition, compared to the case of press-fitting, deterioration of the magnetic properties of the rotor can be suppressed.

In the motor structure according to one aspect of the present invention, the rotor (10) has a rotor end surface (13a) disposed at the outer end in the axial direction, and the through hole (32) has an engaging claw (55). ) can be inserted into the rotor end surface (13a), and the engagement claw (55) of the engagement jig (50) inserted into the through hole (32) is inserted into the rotor end surface (13a). ) may be engageable.
According to this configuration, the rotor can be easily gripped by the engagement jig by engaging the engagement claw with the end surface of the rotor.

In the motor structure according to one aspect of the present invention, the through hole (32) includes a fixing jig that restricts relative rotation of the engagement jig (50) and the rotor (10) about the rotation center. (60) may be inserted together with the engagement jig (50).
According to this configuration, the fixing jig can prevent the engagement jig from disengaging from the rotor, so the rotor can be firmly gripped.

In the motor structure according to one aspect of the present invention, a limiting jig (70) that limits movement of the fixing jig (60) in the axial direction with respect to the engaging jig (50) is configured to It may be possible to fix it to the jig (50).
According to this configuration, the limiting jig can prevent the fixing jig from coming off the through hole, so that workability is improved.

A motor manufacturing method according to one aspect of the present invention includes preparing a cylindrical rotor (10) fixed to a rotating shaft (3), and the rotor (10) is arranged along an axis (C) of the rotor (10). The rotor (10) has a through hole (32) that passes through the rotor (10) in the axial direction, and the through hole (32) has an arc shape centered on the rotation center of the rotor (10) when viewed from the axial direction. The rotor (10) has a rotor end surface (13a) disposed at the outer end in the axial direction, and an engagement jig (50) having an engagement claw (55) is inserted into the through hole (32). and after the engagement jig insertion step, the engagement jig (50) inserted into the through hole (32) is centered around the rotation center of the rotor (10). and an engaging claw engaging step of rotating as a rotor and engaging the engaging claw (55) with the rotor end surface (13a).
According to this method, the rotor can be easily gripped by the engagement jig by engaging the engagement claw with the end surface of the rotor. In addition, since there is no need to provide a rotor boss for gripping the rotor, the number of parts can be reduced. Therefore, the rotor can be assembled while reducing the number of parts.

In the motor manufacturing method according to one aspect of the present invention, after the engaging claw engaging step, a fixing jig (60) is inserted into a portion of the through hole (32) in which the engaging jig (50) is not inserted. The method may further include a relative rotation limiting step of inserting the engaging jig (50) and the rotor (10) from relative rotation about the rotation center.
According to this method, the fixing jig can prevent the engagement jig from disengaging from the rotor, so the rotor can be firmly gripped.

In the motor manufacturing method according to one aspect of the present invention, after the relative rotation limiting step, a limiting jig (70) is fixed to the engaging jig (50), and the fixing jig (60) is fixed to the engaging jig (50). The method may further include an axial movement restriction step of restricting movement of the tool (50) in the axial direction.
According to this method, the limiting jig can prevent the fixing jig from coming off the through hole, improving work efficiency.

In the motor manufacturing method according to one aspect of the present invention, the rotating shaft (3) has a shaft-side recess (3a) recessed radially inward from the outer periphery of the rotating shaft (3), or The rotor (10) has a shaft-side protrusion (3b) that protrudes radially outward from the outer periphery, and the rotor (10) has a rotor-side protrusion (11a) that protrudes radially inward from the inner periphery of the rotor (10), or , has a rotor side recess (11b) recessed radially outward from the inner periphery of the rotor (10), and after the axial movement limiting step, the engaging jig (50) or the fixing jig (60) ) and engage the shaft-side concave portion (3a) and the rotor-side convex portion (11a) with each other, or engage the shaft-side convex portion (3b) and the rotor-side concave portion (11b) with each other. The method may further include a rotor fixing step of fixing the rotor (10) to the rotating shaft (3).
According to this method, the rotation of the rotor around the rotating shaft is restricted by the engagement between the concave portion and the convex portion, so no press-fitting process or press-fitting machine is required when assembling the rotor, reducing manufacturing costs. Can be done. In addition, compared to the case of press-fitting, deterioration of the magnetic properties of the rotor can be suppressed.

According to the aspect of the present invention, the rotor can be assembled while reducing the number of parts.

FIG. 2 is a front view of a motor structure according to an embodiment. FIG. 2 is a perspective view of a rotor according to an embodiment. FIG. 2 is a front view of a rotor core according to an embodiment. FIG. 2 is a perspective view of an engagement jig according to an embodiment. FIG. 2 is a perspective view of a fixing jig according to an embodiment. It is a perspective view of a restriction jig concerning an embodiment. FIG. 2 is a perspective view showing an assembled state of an engagement jig, a fixing jig, and a limiting jig according to the embodiment. FIG. 3 is a process diagram for explaining an example of a motor manufacturing process according to an embodiment. 9 is a process diagram following FIG. 8. It is a process diagram following FIG. 9. 11 is a process diagram following FIG. 10. 12 is a process diagram following FIG. 11. It is a process diagram following FIG. 12. 14 is a process diagram following FIG. 13. It is a process diagram following FIG. 14. 16 is a process diagram following FIG. 15. 17 is a process diagram following FIG. 16. FIG. 7 is a front view showing another example of the motor structure according to the embodiment. FIG. 7 is a process diagram for explaining another example of the motor manufacturing process according to the embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

<Motor structure>
As shown in FIG. 1, a motor structure 1 includes an inner rotor type motor 2. As shown in FIG. The motor 2 is a driving motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. Power obtained from the motor 2 is transmitted to drive wheels (not shown) through a rotating shaft 3 (for example, a motor output shaft).

The motor 2 includes a cylindrical rotor 10 fixed to a rotating shaft 3 and a stator 20 disposed around the outer periphery of the rotor 10. In the following description, the direction along the axis C of the rotor 10 will be referred to as the axial direction, the direction perpendicular to the axis C will be referred to as the radial direction, and the direction around the axis C will be referred to as the circumferential direction.

<Stator>
The stator 20 includes a stator core 21, insulators 22 and 23 attached to the stator core 21, and coils 24 of multiple phases (for example, U phase, V phase, and W phase).

The stator core 21 is formed into a cylindrical shape coaxial with the axis C. For example, the stator core 21 is a laminated core formed by laminating a plurality of steel plates (for example, electromagnetic steel plates such as silicon steel plates) in the axial direction. Note that the stator core 21 may be a so-called powder core obtained by compression molding metal magnetic powder (soft magnetic powder).

The stator core 21 includes an annular core body 21a that is coaxial with the axis C when viewed from the axial direction, and a plurality of (for example, 12 ) teeth 21b. The twelve teeth 21b are arranged at intervals of approximately 30 degrees (center angle) in the circumferential direction.

The insulators 22 and 23 are attached to both sides of the stator core 21 in the axial direction. The insulators 22 and 23 are axially splittable with respect to the stator core 21. The insulators 22 and 23 are attached to the inner peripheral portion of the core body 21a.

The coil 24 is formed by winding a wire (for example, an electrical conductor such as a copper wire) around each of the plurality of teeth 21b via insulators 22 and 23. Stator core 21 generates a magnetic field when current flows through coil 24 .

<Rotor>
The rotor 10 is spaced apart from the stator 20 in the radial direction. The rotor 10 is configured to be rotatable around the axis C integrally with the rotating shaft 3. As shown in FIG. 2, the rotor 10 includes a rotor core 11, a magnet 12, and an end plate 13.

As shown in FIG. 3, the rotor core 11 is formed in an annular shape coaxial with the axis C when viewed from the axial direction. The rotor core 11 is a laminated core formed by laminating a plurality of steel plates (for example, electromagnetic steel plates such as silicon steel plates) in the axial direction. Note that the rotor core 11 may be a so-called powder core obtained by compression molding metal magnetic powder (soft magnetic powder).

The rotor core 11 has a magnet insertion hole 30, a rotating shaft insertion hole 31, and a through hole 32.
The magnet insertion hole 30 is provided on the outer circumference of the rotor core 11. The magnet insertion hole 30 passes through the rotor core 11 in the axial direction.

The rotor 10 of this embodiment is an IPM (Interior Permanent Magnet) in which the magnets 12 are embedded in each of a plurality of magnet insertion holes 30 inside the rotor core 11. In this embodiment, the number of pole pairs of the rotor core 11 is four pole pairs (eight poles). In this embodiment, a plurality of pairs (eight pairs in the illustrated example) of a pair of magnet insertion holes 30 arranged in a V-shape when viewed from the axial direction are arranged at substantially equal intervals in the circumferential direction. That is, the plurality of pairs of magnet insertion holes 30 are arranged substantially at intervals of 45° in the circumferential direction on the outer circumference of the rotor core 11.

In this embodiment, the plurality of pairs of magnets 12 embedded in the plurality of pairs of magnet insertion holes 30 are arranged substantially at intervals of 45° in the circumferential direction on the outer circumference of the rotor core 11. In each pair of magnets 12, surfaces facing each other in the circumferential direction have the same polarity (N pole or S pole). Each pair of magnets 12 is magnetized such that the polarities of the magnetic poles formed on the outer circumferential surface of the rotor core 11 by the magnets 12 (portions sandwiched between the pair of magnets 12 in the rotor core 11) are arranged alternately in the circumferential direction.

In the figure, the symbol Ld indicates the d-axis of the magnetic pole constituted by the magnet 12, and the symbol Lq indicates the q-axis. Note that the d-axis Ld corresponds to a virtual straight line (a virtual straight line passing through the center of the magnetic pole) that passes through the axis C and bisects the space between the pair of V-shaped magnets 12 when viewed from the axial direction. The q-axis Lq corresponds to a virtual straight line (a virtual straight line passing through the center between the magnetic poles) that passes through the axis C and bisects the space between two pairs of circumferentially adjacent magnets 12 when viewed from the axial direction.

For example, magnet 12 is a permanent magnet. The permanent magnet is, for example, a rare earth magnet. Examples of rare earth magnets include neodymium magnets, samarium cobalt magnets, and praseodymium magnets.

The magnets 12 are inserted into each magnet insertion hole 30 of the rotor core 11, respectively. The magnet 12 is fixed in each magnet insertion hole 30 of the rotor core 11. A plurality of magnets 12 are provided in the circumferential direction. The magnet 12 is formed into a rectangular shape when viewed from the axial direction. The magnet 12 extends along the axial direction.

The rotor core 11 has a flux barrier 33 for suppressing magnetic flux leakage from the longitudinal ends of the magnets 12 to the rotor core 11 . The flux barrier 33 is a cavity that penetrates the rotor core 11 in the axial direction. The flux barrier 33 is arranged at the end of the magnet 12 on the q-axis Lq side. Note that the rotor core 11 may have a flux barrier disposed at the end of the magnet 12 on the d-axis Ld side.

The rotating shaft insertion hole 31 passes through the rotor core 11 in the axial direction. The rotating shaft insertion hole 31 is provided coaxially with the axis C. The rotating shaft insertion hole 31 is a through hole into which the rotating shaft 3 (see FIG. 1) is inserted.

As shown in FIG. 1, the rotating shaft 3 has a shaft-side recess 3a that is depressed radially inward from the outer periphery of the rotating shaft 3. A pair of shaft-side recesses 3a are provided with the axis C interposed therebetween when viewed from the axial direction. The shaft-side recess 3a is recessed in a rectangular shape from the outer peripheral surface of the rotating shaft 3 when viewed from the axial direction.

As shown in FIG. 3, the rotor core 11 has a rotor-side convex portion 11a that protrudes radially inward from the inner circumference of the rotor core 11. A pair of rotor-side convex portions 11a are provided with the axis C interposed therebetween when viewed from the axial direction. The pair of rotor-side convex portions 11a are arranged on the q-axis Lq when viewed from the axial direction. The rotor-side convex portion 11a has a shape that can be engaged with the shaft-side recess 3a (see FIG. 1) when viewed from the axial direction. The rotor-side convex portion 11a protrudes in a rectangular shape from the inner peripheral surface of the rotor core 11 when viewed from the axial direction.

In this embodiment, rotation of the rotor 10 about the rotating shaft 3 is restricted by engaging the shaft side recess 3a and the rotor side convex portion 11a with each other. In this embodiment, the rotor core 11 is a laminated core in which a plurality of steel plates are laminated in the axial direction, and the rotor-side convex portion 11a formed on the inner circumference of the rotor core 11 directly engages with the shaft-side recess 3a.

The rotor core 11 has a lightened portion 34 including a plurality of lightened holes 34a to 34c passing through the rotor core 11 in the axial direction. The hollowed out portion 34 is provided between the rotating shaft insertion hole 31 and the magnet insertion hole 30 in the radial direction of the rotor core 11 . The hollowed-out portion 34 is provided in an annular shape centered on the axis C when viewed from the axial direction. The plurality of lightening holes 34a to 34c include triangular holes 34a and 34b and a diamond-shaped hole 34c when viewed from the axial direction.

<Through hole>
The through hole 32 passes through the rotor core 11 in the axial direction. The through hole 32 is provided between the rotary shaft insertion hole 31 and the hollowed out portion 34 in the radial direction of the rotor core 11 . The through hole 32 has a circular arc shape centered on the axis C (the rotation center of the rotor) when viewed from the axial direction.

A plurality of (for example, four in this embodiment) through holes 32 are provided at intervals in the circumferential direction. The four through holes 32 are arranged at intervals of approximately 90 degrees (center angle) in the circumferential direction. The four through holes 32 are arranged at the same position in the radial direction of the rotor core 11. The four through holes 32 have different positions in the circumferential direction, but have the same arcuate shape when viewed from the axial direction. Note that the number and position of the through holes 32 are not limited to those described above, and can be changed according to required specifications.

When viewed from the axial direction, the rotor core 11 includes an inner arcuate portion 32a that is arcuate along the inner periphery of the through hole 32, an outer arcuate portion 32b that is arcuate along the outer periphery of the through hole 32, and an inner arcuate portion 32a that extends in the radial direction. and a pair of straight line portions 32c connecting both circumferential ends of the outer arcuate portion 32b and both circumferential ends of the outer arcuate portion 32b. The pair of straight portions 32c are arranged on the d-axis Ld when viewed from the axial direction. The through hole 32 is defined by an inner arcuate portion 32a, an outer arcuate portion 32b, and a pair of straight portions 32c.

As shown in FIG. 2, the end plate 13 covers the rotor core 11 from both sides in the axial direction. A pair of end plates 13 are provided at both ends of the rotor core 11 in the axial direction. The pair of end plates 13 are arranged in contact with the end faces of the rotor core 11 facing in the axial direction. A rotor end surface 13 a disposed at the axially outer end of the rotor 10 is an axially outer surface of the end plate 13 .

The end plate 13 is formed into an annular shape centered on the axis C. The outer diameter of the end plate 13 is approximately the same as or smaller than the outer diameter of the rotor core 11. The inner diameter of the end plate 13 is approximately the same as the inner diameter of the rotor core 11 (the inner diameter of the rotating shaft insertion hole 31). The end plate 13 is fixed to the rotor core 11 by caulking or fastening, for example. Note that the end plate 13 may be adhesively fixed to the rotor core 11. Note that the end plate 13 does not need to be fixed to the rotor core 11.

The end plate 13 suppresses movement of the magnet 12 in the axial direction. The end plate 13 has a magnet fixing hole 40 that is smaller than the magnet insertion hole 30 of the rotor core 11 when viewed from the axial direction. A portion of the end plate 13 along the outer peripheral edge of the magnet fixing hole 40 prevents the magnet 12 from protruding outward in the axial direction. The magnet fixing hole 40 has a cooling effect on the magnet 12.

The openings other than the magnet fixing holes 40 in the end plate 13 have the same shape as the openings other than the magnet insertion holes 30 of the rotor core 11 when viewed from the axial direction. That is, the end plate 13 has the same shape as the rotor core 11 except for the shape of the magnet fixing hole 40 when viewed from the axial direction. In the figure, reference numeral 41 indicates a rotation shaft insertion hole in the end plate 13, reference numeral 42 indicates a through hole in the end plate 13, reference numeral 43 indicates a flux barrier in the end plate 13, and reference numeral 44 indicates a hollowed out portion.

<Engagement jig>
An engagement jig 50 (see FIG. 4) having an engagement claw 55 can be inserted into the through hole 32 of the rotor 10. An engagement claw 55 of an engagement jig 50 inserted into the through hole 32 can be engaged with the rotor end surface 13a. FIG. 4 shows the state in which the engagement jig 50 is inserted into the through hole 32 of the rotor 10 (hereinafter also referred to as the "engagement jig inserted state") together with the axis C. As shown in FIG. 4, the engagement jig 50 includes a cylindrical engagement tube portion 51 and an engagement claw 55 connected to the outer circumference of the engagement tube portion 51. The engaging cylinder portion 51 and the engaging claw 55 are integrally formed of the same member.

In the engagement jig inserted state, the engagement cylinder portion 51 is arranged coaxially with the axis C. The engagement cylinder portion 51 includes a cylindrical head 52 and a cylinder main body 53 provided between the head 52 and the engagement claw 55.

A plurality of flat surfaces 52a are provided on the outer peripheral surface of the head 52. The plurality of planes 52a include four surfaces 52a along four sides of a rectangle when viewed from the axial direction. A threaded portion 52b is provided on the inner circumferential surface of the head 52, into which another jig (for example, a jig having a threaded portion on the outer circumferential surface) can be screwed.

The cylindrical body 53 has a guide groove 53a that can guide the fixing piece 62 (see FIG. 5) of the fixing jig 60. The guide groove 53a is recessed radially inward from the outer peripheral surface of the cylindrical body 53. The guide groove 53a extends in the axial direction of the cylindrical body 53. A plurality of guide grooves 53a (for example, four in this embodiment) are provided corresponding to the plurality of fixing pieces 62. The four guide grooves 53a are arranged at the same intervals in the circumferential direction. The bottom surface of each guide groove 53a is continuous so as to be located on the same plane as each flat surface 52a provided on the head 52. A threaded portion 53b into which a limiting jig 70 (see FIG. 6) can be screwed is provided on the outer circumferential surface of the cylindrical main body 53.

A plurality of engaging claws 55 (for example, four in this embodiment) are provided corresponding to the plurality of through holes 32. The four engaging claws 55 are arranged at equal intervals in the circumferential direction. Note that the number and position of the engagement claws 55 are not limited to those described above, and can be changed according to required specifications.

In the engagement jig inserted state, the engagement claw 55 is arranged at a position overlapping the through hole 32 when viewed from the axial direction. The engaging claw 55 has the same shape as the through hole 32 when viewed from the axial direction. The engagement claw 55 includes an axially extending portion 56 that extends in the axial direction, and a circumferential portion that extends in the circumferential direction from the tip of the axially extending portion 56 (the end on the opposite side to the engaging cylinder portion 51 in the axial direction). A direction extending portion 57 is provided. A circumferentially extending portion 57 of an engaging claw 55 inserted into the through hole 32 can be engaged with the rotor end surface 13a (see FIG. 2).

The axial length of the axially extending portion 56 is greater than or equal to the axial length of the rotor 10 . Here, the axial length of the axially extending portion 56 corresponds to the distance in the axial direction between the axially inner end surface of the engaging cylinder portion 51 and the axially inner end surface of the circumferentially extending portion 57. . The axial length of the rotor 10 corresponds to the distance between the pair of rotor end surfaces 13a in the axial direction. In this embodiment, the axial length of the axially extending portion 56 is approximately the same as the axial length of the rotor 10. Note that the axial length of the axially extending portion 56 is not limited to the above, and can be changed according to required specifications.

The radial length of the axially extending portion 56 is approximately the same as the radial length of the through hole 32. Here, the radial length of the axially extending portion 56 means the length of a portion of the axially extending portion 56 that overlaps with a virtual straight line perpendicular to the axis C when viewed from the axial direction. The length of the through hole 32 in the radial direction corresponds to the length of the straight portion 32c (see FIG. 3) when viewed from the axial direction. Note that the radial length of the axially extending portion 56 is not limited to the above, and can be changed according to required specifications.

The length of the axially extending portion 56 in the circumferential direction is approximately half the length of the through hole 32 in the circumferential direction. Here, the length in the circumferential direction of the axially extending portion 56 means the arcuate length of a portion of the axially extending portion 56 located on the outside in the radial direction when viewed from the axial direction. The circumferential length of the through hole 32 corresponds to the length of the outer arcuate portion 32b (see FIG. 3) when viewed from the axial direction. Note that the circumferential length of the axially extending portion 56 is not limited to the above, and can be changed according to required specifications.

The four circumferentially extending portions 57 each extend in the same circumferential direction from the tip of the axially extending portion 56 when viewed from the axial direction. The radial length of the circumferentially extending portion 57 is approximately the same as the radial length of the through hole 32 . Here, the radial length of the circumferentially extending portion 57 means the length of a portion of the circumferentially extending portion 57 that overlaps with a virtual straight line perpendicular to the axis C when viewed from the axial direction. In this embodiment, the radial length of the circumferentially extending portion 57 is approximately the same as the radially length of the axially extending portion 56. Note that the radial length of the circumferentially extending portion 57 is not limited to the above, and can be changed according to required specifications.

The length of the circumferentially extending portion 57 in the circumferential direction is approximately the same as the length of the through hole 32 in the circumferential direction. Here, the length in the circumferential direction of the circumferentially extending portion 57 means the length of the arc of the portion of the circumferentially extending portion 57 located on the outside in the radial direction when viewed from the axial direction. In this embodiment, the circumferential length of the circumferentially extending portion 57 is approximately twice the circumferential length of the axially extending portion 56. Note that the circumferential length of the circumferentially extending portion 57 is not limited to the above, and can be changed according to required specifications.

<Fixing jig>
A fixing jig 60 that restricts relative rotation of the engagement jig 50 and the rotor 10 around the rotation center of the rotor 10 can be inserted into the through hole 32 of the rotor 10 together with the engagement jig 50. . FIG. 5 shows a state in which the fixing jig 60 is inserted into the through hole 32 of the rotor 10 (hereinafter also referred to as a "fixing jig insertion state") together with the axis C. As shown in FIG. 5, the fixing jig 60 includes a cylindrical fixing cylinder part 61 and a fixing piece 62 connected to the inner peripheral part of the fixing cylinder part 61. The fixed cylinder portion 61 and the fixed piece 62 are integrally formed of the same member.

In the fixing jig insertion state, the fixing cylinder portion 61 is arranged coaxially with the axis C. The inner diameter of the fixed cylindrical portion 61 is larger than the outer diameter of the cylindrical portion main body 53 (see FIG. 4). Here, the inner diameter of the fixed cylindrical portion 61 means the inner diameter of a portion of the fixed cylindrical portion 61 excluding the connecting portion of the fixed piece 62 (cylindrical fixed cylindrical portion main body). The outer diameter of the cylindrical body 53 means the maximum outer diameter of the portion of the cylindrical body 53 excluding the guide groove 53a (the outer peripheral surface having the threaded portion 53b).

A plurality of fixing pieces 62 (for example, four in this embodiment) are provided corresponding to the plurality of through holes 32. The four fixing pieces 62 are arranged at the same intervals in the circumferential direction. Note that the number and position of the fixed pieces 62 are not limited to those described above, and can be changed according to required specifications.

In the fixing jig inserted state, the fixing piece 62 is arranged at a position overlapping the through hole 32 when viewed from the axial direction. The fixed piece 62 extends linearly in the axial direction. A fixing piece 62 can be inserted into the through hole 32 of the rotor together with the axially extending portion 56 .

The length of the fixing piece 62 in the axial direction is approximately the same as the length of the engaging claw 55 in the axial direction. Here, the axial length of the fixed piece 62 is the axial length between the axially inner end surface of the fixed cylindrical part 61 and the tip of the fixed piece 62 (the end on the opposite side from the fixed cylindrical part 61 in the axial direction). corresponds to the distance between Note that the length of the fixed piece 62 in the axial direction is not limited to the above, and can be changed according to required specifications.

The length of the fixed piece 62 in the radial direction is smaller than the length of the through hole 32 in the radial direction. Here, the radial length of the fixed piece 62 means the length of a portion of the fixed piece 62 that overlaps with a virtual straight line perpendicular to the axis C when viewed from the axial direction. Note that the length of the fixing piece 62 in the radial direction is not limited to the above, and can be changed according to required specifications.

The length of the fixing piece 62 in the circumferential direction is approximately half the length of the through hole 32 in the circumferential direction. Here, the length of the fixed piece 62 in the circumferential direction means the arc length of the portion of the fixed piece 62 located on the outside in the radial direction when viewed from the axial direction. In this embodiment, the total circumferential length of the axially extending portion 56 and the fixing piece 62 is approximately the same as the circumferential length of the through hole 32 . Note that the length of the fixing piece 62 in the circumferential direction is not limited to the above, and can be changed according to required specifications.

<Limit jig>
A restriction jig 70 (see FIG. 6) that restricts movement of the fixing jig 60 in the axial direction with respect to the engagement jig 50 can be fixed to the engagement jig 50. 6 and 7 together with axis C show a state in which the limiting jig 70 is fixed to the engagement jig 50 in the engagement jig inserted state (hereinafter also referred to as "limiting jig fixed state"). . For example, the restriction jig 70 is a jig nut that can be screwed onto the engagement jig 50.

As shown in FIG. 6, in the limiting jig fixed state, the limiting jig 70 is arranged coaxially with the axis C. A threaded portion 71 that can be screwed into the threaded portion 53b (see FIG. 7) on the outer peripheral surface of the cylindrical body 53 is provided on the inner peripheral surface of the limiting jig 70. The outer peripheral surface of the limiting jig 70 has a hexagonal shape when viewed from the axial direction. The outer circumferential surface of the limiting jig 70 includes six surfaces 72 along six sides of a hexagon when viewed from the axial direction. In the limiting jig fixed state, the six surfaces 72 are arranged radially outward from the outer circumferential surface (see FIG. 7) of the fixed cylinder portion 61 of the fixing jig 60 when viewed from the axial direction.

<Motor manufacturing method>
An example of the motor manufacturing method according to the embodiment will be described below.
The motor manufacturing method of the embodiment includes a rotor preparation process, an engagement jig insertion process, an engagement claw engagement process, a relative rotation restriction process, an axial movement restriction process, and a rotor fixing process.

First, in the rotor preparation step, the above-mentioned rotor 10 (see FIG. 1) fixed to the rotating shaft 3 is prepared. After the rotor preparation step, the process moves to an engagement jig insertion step.

As shown in FIG. 8, in the engagement jig insertion step, an engagement jig 50 having an engagement claw 55 is inserted into the through hole 32. For example, the engagement jig 50 is disposed coaxially with the rotor 10 on one side of the rotor 10 in the axial direction, and the engagement claw 55 is disposed at a position overlapping with the through hole 32 of the rotor 10 when viewed from the axial direction. Thereafter, the four engagement claws 55 of the engagement jig 50 are inserted into the four through holes 32 of the rotor 10, respectively.

For example, as shown in FIG. 13a) until it touches. Then, as shown in FIG. 10, the circumferentially extending portion 57 of each engaging claw 55 projects from the other axial end surface (the other rotor end surface 13a) of the rotor 10. After the engagement jig insertion process, the process moves to the engagement claw engagement process.

As shown in FIG. 11, in the engagement claw engagement process, the engagement jig 50 inserted into the through hole 32 is rotated about the rotation center of the rotor 10, and the engagement claw 55 is attached to the other rotor end surface 13a. engage. For example, the engagement jig 50 is rotated until one circumferential side of the axially extending portion 56 of the engagement claw 55 comes into contact with one circumferential straight portion 32 c facing the through hole 32 . For example, by rotating the engagement jig 50 inserted into the through hole 32 in the direction of arrow R, the circumferentially extending portion 57 of each engagement claw 55 is engaged with the other rotor end surface 13a. After the engaging claw engaging step, the process moves to a relative rotation limiting step.

As shown in FIG. 12, in the relative rotation limiting step, the fixing jig 60 is inserted into the portion of the through hole 32 where the engagement jig 50 is not inserted (hereinafter also referred to as "the gap of the through hole 32"). , restricts relative rotation of the engagement jig 50 and the rotor 10 about the rotation center of the rotor 10. For example, the fixing jig 60 is arranged coaxially with the rotor 10 on one side of the rotor 10 in the axial direction, and the fixing piece 62 is placed at a position that overlaps the gap between the through holes 32 and the guide groove 53a of the engagement jig 50 when viewed from the axial direction. Deploy. Thereafter, the four fixing pieces 62 of the fixing jig 60 are inserted into the gaps between the four through holes 32, respectively.

For example, as shown in FIG. 13, when the fixing piece 62 is inserted into the gap in the through hole 32, one circumferential side of the fixing piece 62 comes into contact with the other circumferential side of the axially extending portion 56, and the fixing piece 62 The other circumferential side surface contacts the other circumferential straight portion 32c facing the gap of the through hole 32. For example, when the fixing jig 60 is inserted until the axially inner end surface of the fixing tube 61 (see FIG. 12) contacts one rotor end surface 13a (see FIG. 12), the tip of each fixing piece 62 (axially (a portion opposite to the fixed cylinder portion 61) protrudes from the other rotor end surface 13a (see FIG. 13). After the relative rotation limiting step, the process moves to an axial movement limiting step.

As shown in FIG. 14, in the axial movement limiting step, a limiting jig 70 is fixed to the engaging jig 50, and movement of the fixing jig 60 in the axial direction with respect to the engaging jig 50 is restricted. . For example, the limiting jig 70 is disposed coaxially with the rotor 10 on one side of the rotor 10 in the axial direction. Thereafter, as shown in FIG. 15, the threaded portion 71 on the inner circumferential surface of the limiting jig 70 is screwed into the threaded portion 53b on the outer circumferential surface of the engagement jig 50. After the axial movement restriction step, the rotor fixing step is performed.

As shown in FIG. 16, in the rotor fixing step, the rotor is fixed by holding the engagement jig 50 and engaging the shaft-side recess 3a (see FIG. 1) and the rotor-side convex portion 11a (see FIG. 3) with each other. 10 is fixed to the rotating shaft 3. For example, another jig 80 capable of holding the engagement jig 50 is prepared. Another jig 80 has an opening 81 that opens in the axial direction. Another jig 80 has an engagement surface 82 facing opening 81 .

For example, the two flat surfaces 52a of the head 52 of the engagement jig 50 are engaged with the engagement surfaces 82 of another jig 80 to stop the rotor 10 from rotating, and a nut 90 or the like is tightened on the rotating shaft 3. You can do it like this. For example, as shown in FIG. 17, the rotor 10 may be stopped from rotating with another jig 80, and a rotation angle sensor nut 91 or the like may be tightened on the rotating shaft 3.
Through the above steps, the motor 2 of the embodiment is manufactured.

<Effect>
As explained above, the motor structure 1 of the above embodiment includes the cylindrical rotor 10 fixed to the rotating shaft 3. The rotor 10 has a through hole 32 that penetrates the rotor 10 in the axial direction along the axis C of the rotor 10. The through hole 32 has an arc shape centered on the rotation center of the rotor 10 when viewed from the axial direction.
According to this configuration, the through hole 32 has an arc shape centered on the rotation center of the rotor 10 when viewed from the axial direction, so that a jig or the like can be inserted into the through hole 32 to center the rotation center of the rotor 10. By rotating the rotor 10 around the center, the rotor 10 can be gripped by a jig or the like. In addition, since there is no need to provide a rotor boss for gripping the rotor 10, the number of parts can be reduced. Therefore, the rotor 10 can be assembled while reducing the number of parts.

In the embodiment described above, the rotating shaft 3 has a shaft-side recess 3 a that is depressed radially inward from the outer periphery of the rotating shaft 3 . The rotor 10 has a rotor-side convex portion 11a that protrudes radially inward from the inner circumference of the rotor 10. Rotation of the rotor 10 about the rotating shaft 3 is restricted by the shaft-side recess 3a and the rotor-side convex portion 11a engaging with each other.
According to this configuration, the rotation of the rotor 10 about the rotating shaft 3 is restricted by the engagement structure having the recess 3a and the protrusion 11a, so a press-fitting process or a press-fitting machine is not required when assembling the rotor 10. , manufacturing costs can be reduced. In addition, deterioration of the magnetic properties of the rotor 10 can be suppressed compared to the case of press-fitting.

In the embodiment described above, the rotor 10 has a rotor end surface 13a located at the outer end in the axial direction. An engagement jig 50 having an engagement claw 55 can be inserted into the through hole 32 . An engagement claw 55 of an engagement jig 50 inserted into the through hole 32 can be engaged with the rotor end surface 13a.
According to this configuration, the rotor 10 can be easily gripped by the engagement jig 50 by engaging the engagement claw 55 with the rotor end surface 13a.

In the embodiment described above, a fixing jig 60 that restricts relative rotation of the engagement jig 50 and the rotor 10 around the rotation center of the rotor 10 can be inserted into the through hole 32 together with the engagement jig 50. be done.
According to this configuration, the fixing jig 60 can prevent the engagement jig 50 and the rotor 10 from disengaging, so the rotor 10 can be firmly gripped.

In the embodiment described above, the limiting jig 70 that restricts the movement of the fixing jig 60 in the axial direction with respect to the engagement jig 50 can be fixed to the engagement jig 50.
According to this configuration, the limiting jig 70 can prevent the fixing jig 60 from coming off the through hole 32, so that workability is improved.

In the motor manufacturing method of the above embodiment, a cylindrical rotor 10 fixed to the rotating shaft 3 is prepared. The rotor 10 has a through hole 32 that penetrates the rotor 10 in the axial direction along the axis C of the rotor 10. The through hole 32 has an arc shape centered on the rotation center of the rotor 10 when viewed from the axial direction. The rotor 10 has a rotor end surface 13a located at the outer end in the axial direction. The motor manufacturing method includes an engagement jig insertion step in which an engagement jig 50 having an engagement claw 55 is inserted into the through hole 32, and an engagement jig inserted into the through hole 32 after the engagement jig insertion step. The method includes an engaging claw engaging step of rotating the tool 50 around the rotation center of the rotor 10 and engaging the engaging claw 55 with the rotor end surface 13a.
According to this method, the rotor 10 can be easily gripped by the engagement jig 50 by engaging the engagement claw 55 with the rotor end surface 13a. In addition, since there is no need to provide a rotor boss for gripping the rotor 10, the number of parts can be reduced. Therefore, the rotor 10 can be assembled while reducing the number of parts.

In the above embodiment, the motor manufacturing method includes inserting the fixing jig 60 into the portion of the through hole 32 in which the engagement jig 50 is not inserted after the engagement claw engagement step, and A relative rotation limiting step is included in which relative rotation of the rotor 10 is limited about the rotation center of the rotor 10.
According to this method, the fixing jig 60 can prevent the engagement jig 50 from disengaging from the rotor 10, so the rotor 10 can be firmly gripped.

In the above embodiment, the motor manufacturing method includes fixing the limiting jig 70 to the engaging jig 50 and moving the fixing jig 60 in the axial direction with respect to the engaging jig 50 after the relative rotation limiting step. including an axial movement limiting step for limiting the axial movement.
According to this method, the limiting jig 70 can prevent the fixing jig 60 from coming off the through hole 32, so that workability is improved.

In the embodiment described above, the rotating shaft 3 has a shaft-side recess 3 a that is depressed radially inward from the outer periphery of the rotating shaft 3 . The rotor 10 has a rotor-side convex portion 11a that protrudes radially inward from the inner periphery of the rotor 10. In the motor manufacturing method, after the axial movement limiting process, the rotor 10 is fixed to the rotating shaft 3 by holding the engagement jig 50 and engaging the shaft side recess 3a and the rotor side convex part 11a with each other. Includes fixation process.
According to this method, the rotation of the rotor 10 about the rotating shaft 3 is restricted by the engagement between the concave portion 3a and the convex portion 11a, so a press-fitting process or a press-fitting machine is not required when assembling the rotor 10, and manufacturing Costs can be reduced. In addition, compared to the case of press-fitting, deterioration of the magnetic properties of the rotor 10 can be suppressed.

<Modified example>
In the above embodiment, the rotating shaft 3 has a shaft-side recess 3a that is recessed radially inward from the outer periphery of the rotor 10, and the rotor 10 has a rotor-side convex portion that protrudes radially inward from the inner periphery of the rotor 10. 11a, and the rotation of the rotor 10 about the rotating shaft 3 is restricted by engaging each other with the shaft-side recess 3a and the rotor-side protrusion 11a, but the invention is not limited to this. . For example, as shown in FIG. 18, the rotating shaft 3 has a shaft-side convex portion 3b that projects radially outward from the outer periphery of the rotating shaft 3, and the rotor 10 has a concave portion 3b extending radially outward from the inner periphery of the rotor 10. Rotation of the rotor 10 about the rotating shaft 3 may be restricted by having the rotor-side recessed portion 11b with the shaft-side convex portion 3b and the rotor-side recessed portion 11b engaging with each other. For example, the manner of engagement between the rotating shaft 3 and the rotor 10 can be changed depending on required specifications.

In the embodiment described above, the rotor 10 has a rotor end face 13a disposed at the outer end in the axial direction, and an engagement jig 50 having an engagement claw 55 can be inserted into the through hole 32, and the rotor end face 13a is inserted into the through hole 32. 13a, an example has been described in which the engagement claw 55 of the engagement jig 50 inserted into the through hole 32 can be engaged, but the present invention is not limited to this. For example, the engagement jig 50 does not need to have the engagement claws 55. For example, by connecting another engagement jig to the tip of the engagement jig inserted into the through hole 32, the other engagement jig may be engaged with the rotor end surface 13a. For example, the aspect of the engagement jig can be changed depending on the required specifications.

In the embodiment described above, a fixing jig 60 that restricts relative rotation of the engagement jig 50 and the rotor 10 around the rotation center of the rotor 10 can be inserted into the through hole 32 together with the engagement jig 50. Although the explanation has been given using an example, the invention is not limited to this. For example, the fixing jig 60 and the engagement jig 50 may not be inserted into the through hole 32 . For example, the fixing jig 60 may not be inserted into the through hole 32, and only the engagement jig 50 may be inserted therein. For example, the manner in which relative rotation between the engagement jig 50 and the rotor 10 is restricted can be changed depending on required specifications.

In the above embodiment, the limiting jig 70 that restricts the movement of the fixing jig 60 in the axial direction with respect to the engagement jig 50 is fixed to the engagement jig 50. However, it is not limited to this. For example, the restriction jig 70 does not need to be fixable to the engagement jig 50. For example, a restriction jig (for example, a band, a clip, etc.) other than the restriction jig 70 may be fixable to the engagement jig 50. For example, the manner in which the fixing jig 60 is prevented from coming off the through hole 32 can be changed depending on the required specifications.

In the above embodiment, the motor manufacturing method includes inserting the fixing jig 60 into the portion of the through hole 32 in which the engagement jig 50 is not inserted after the engagement claw engagement step, and Although the explanation has been given using an example including a relative rotation restriction step of restricting the relative rotation of the rotor 10 around the rotation center, the present invention is not limited to this. For example, the motor manufacturing method may not include a relative rotation limiting step after the engaging pawl engaging step. For example, the process mode after the engagement claw engagement process can be changed according to required specifications.

In the above embodiment, the motor manufacturing method includes fixing the limiting jig 70 to the engaging jig 50 and moving the fixing jig 60 in the axial direction with respect to the engaging jig 50 after the relative rotation limiting step. Although the explanation has been given using an example including an axial movement restriction step that restricts the movement, the present invention is not limited thereto. For example, the motor manufacturing method may not include the axial movement limiting step after the relative rotation limiting step. For example, the process mode after the relative rotation limiting process can be changed according to required specifications.

In the above embodiment, the motor manufacturing method includes, after the axial movement limiting step, holding the engagement jig 50 and engaging the shaft-side concave portion 3a and the rotor-side convex portion 11a with each other to move the rotor 10 to the rotation axis. Although the explanation has been given using an example including the rotor fixing step of fixing the rotor to the third rotor, the present invention is not limited thereto. For example, the motor manufacturing method may not include a rotor fixing step after the axial movement limiting step. For example, the process mode after the axial movement limiting process can be changed depending on the required specifications.

In the embodiment described above, when the engagement tube 51 of the engagement jig 50 is inserted until it comes into contact with one axial end surface (one rotor end surface 13a) of the rotor 10, the circumferentially extending portion of each engagement claw 55 Although an example has been described in which the rotor 57 protrudes from the other end surface in the axial direction of the rotor (the other rotor end surface 13a), the present invention is not limited to this. For example, as shown in FIG. 19, a spacer 95 is arranged on one rotor end surface 13a until the axially inner end surface of the engagement cylinder part 51 of the engagement jig 50 comes into contact with one axial end surface of the spacer 95. When inserted, the circumferentially extending portion 57 (see FIG. 10, not shown in FIG. 19) of each engaging claw 55 is configured to protrude from the other axial end surface of the rotor 10 (the other rotor end surface 13a). It's okay. According to this configuration, by arranging the spacer 95 between the engagement jig 50 and the rotor 10, a common jig can be used for the rotors 10 having different axial lengths.

Although the above embodiment has been described using an example in which the rotor 10 includes the end plate 13, the rotor 10 is not limited to this. For example, the rotor 10 may not include the end plate 13. For example, the rotor 10 may have a rotor end face disposed at the outer end of the rotor core 11 in the axial direction. For example, the aspect of the rotor 10 can be changed depending on required specifications.

In the above embodiment, the motor is a driving motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle, but the present invention is not limited thereto. For example, the motor may be a power generation motor, a motor for other uses, or a rotating electric machine (including a generator) other than for vehicles.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications may be made without departing from the gist of the present invention, such as replacing the components of the embodiments with well-known components. Changes are possible.

1 Motor structure 2 Motor 3 Rotating shaft 3a Shaft side recess 10 Rotor 11a Rotor side convex portion 13a Rotor end face 32 Through hole 50 Engagement jig 55 Engagement claw 60 Fixing jig 70 Limiting jig C Axis

Claims (8)

It includes a cylindrical rotor (10) fixed to a rotating shaft (3),
The rotor (10) has a through hole (32) that passes through the rotor (10) in an axial direction along the axis (C) of the rotor (10),
The through hole (32) has an arc shape centered on the rotation center of the rotor (10) when viewed from the axial direction,
The rotor (10) has a rotor end surface (13a) disposed at the outer end in the axial direction,
An engagement lever (50) having an engagement claw (55) can be inserted into the through hole (32),
The engagement claw (55) of the engagement jig (50) inserted into the through hole (32) engages with the rotor end surface (13a) located on the tip side of the engagement claw (55). motor structure that can be combined with The rotating shaft (3) has a shaft-side recess (3a) recessed radially inward from the outer periphery of the rotating shaft (3), or a shaft-side convex portion protruding radially outward from the outer periphery of the rotating shaft (3). having a part (3b);
The rotor (10) has a rotor-side convex portion (11a) that protrudes radially inward from the inner periphery of the rotor (10), or a rotor-side recess that is recessed radially outward from the inner periphery of the rotor (10). (11b),
When the shaft side recess (3a) and the rotor side convex part (11a) engage with each other, or when the shaft side convex part (3b) and the rotor side concave part (11b) engage with each other, the Motor structure according to claim 1, characterized in that the rotation of the rotor (10) about the axis of rotation (3) is limited. A fixing jig (60) that restricts relative rotation of the engagement jig (50) and the rotor (10) about the rotation center is provided in the through hole (32). The motor structure according to claim 1 or 2, wherein the motor structure is insertable together with (50). A limiting jig (70) that restricts movement of the fixing jig (60) in the axial direction with respect to the engaging jig (50) can be fixed to the engaging jig (50). The motor structure according to claim 3. Prepare a cylindrical rotor (10) fixed to a rotating shaft (3),
The rotor (10) has a through hole (32) that passes through the rotor (10) in an axial direction along the axis (C) of the rotor (10),
The through hole (32) has an arc shape centered on the rotation center of the rotor (10) when viewed from the axial direction,
The rotor (10) has a rotor end surface (13a) disposed at the outer end in the axial direction,
an engagement jig insertion step of inserting an engagement jig (50) having an engagement claw (55) into the through hole (32);
After the engagement jig insertion step, the engagement jig (50) inserted into the through hole (32) is rotated about the rotation center of the rotor (10), and the engagement claw (55) an engaging claw engaging step of engaging the rotor end face (13a) located on the tip side of the engaging claw (55). After the engagement claw engagement step, a fixing jig (60) is inserted into a portion of the through hole (32) where the engagement jig (50) is not inserted, and the engagement jig (50) is inserted into the through hole (32). ) and the rotor (10), the method further comprising a relative rotation limiting step of limiting relative rotation about the rotation center. After the relative rotation limiting step, a limiting jig (70) is fixed to the engaging jig (50), and the fixing jig (60) is rotated in the axial direction with respect to the engaging jig (50). The method for manufacturing a motor according to claim 6, further comprising an axial movement limiting step of limiting movement. The rotating shaft (3) has a shaft-side recess (3a) recessed radially inward from the outer periphery of the rotating shaft (3), or a shaft-side convex portion protruding radially outward from the outer periphery of the rotating shaft (3). having a part (3b);
The rotor (10) has a rotor-side convex portion (11a) that protrudes radially inward from the inner periphery of the rotor (10), or a rotor-side recess that is recessed radially outward from the inner periphery of the rotor (10). (11b),
After the axial movement limiting step, the engaging jig (50) or the fixing jig (60) is held, and the shaft side recess (3a) and the rotor side convex portion (11a) are engaged with each other. Alternatively, the method further includes a rotor fixing step of fixing the rotor (10) to the rotating shaft (3) by engaging the shaft-side convex portion (3b) and the rotor-side concave portion (11b) with each other. The method for manufacturing a motor according to item 7.

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