Resolver stator

Abstract

To provide a resolver stator capable of reducing manufacturing costs.SOLUTION: A resolver stator includes a stator core 10 having a core back 11 and a plurality of teeth 12, an insulating cover 20 having a cylindrical peripheral wall 21 formed along an inner peripheral surface of the core back 11 and a protrusion 22 protruding radially inward from the peripheral wall 21, and a plurality of windings 30 wound around the plurality of teeth 12. One of the plurality of windings 30 is connected to another of the plurality of windings 30 via a crossover wire, and the crossover wire is disposed on one side of the stator core 10 in an axial direction. When viewed along the axial direction, the protrusion 22 is disposed so as to overlap each of the plurality of windings 30, or is disposed between two adjacent windings 30 of the plurality of windings 30, and the protrusion 22 is disposed on the other side of the stator core 10 in the axial direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a resolver stator. [Background technology]

[0002] Patent Document 1 describes a ring-shaped protective cover for a stator. This ring-shaped protective cover is a cover for protecting a stator winding. The stator winding is wound around the magnetic poles of a ring-shaped stator core via a ring-shaped insulator. The ring-shaped protective cover is composed of a first ring-shaped protective cover and a second ring-shaped protective cover that are provided separately from each other. The first ring-shaped protective cover and the second ring-shaped protective cover are arranged to sandwich the ring-shaped stator core from both sides in the axial direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-148081 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional resolver stator, in order to protect the stator windings, it is necessary to provide the above-mentioned ring-shaped protective cover, which therefore poses a problem of increased manufacturing costs.

[0005] The present invention has been made to solve the above-mentioned problems, and has an object to provide a resolver stator that can reduce manufacturing costs. [Means for solving the problem]

[0006] A resolver stator according to the present invention comprises a stator core having an annular core back and a plurality of teeth protruding inward from the core back in a radial direction of the core back, an insulating cover having a cylindrical circumferential wall formed along an inner peripheral surface of the core back and a protrusion protruding inward from the circumferential wall along the radial direction, and a plurality of windings wound around the plurality of teeth, respectively, wherein one of the plurality of windings and another of the plurality of windings are connected via a jumper wire, and the jumper wire is arranged on one side of the core back in the axial direction, the protrusion is arranged so as to overlap each of the plurality of windings when viewed along the axial direction, or is arranged between two adjacent windings of the plurality of windings, and the protrusion is arranged on the other side of the stator core in the axial direction. Effect of the Invention

[0007] According to the present invention, the manufacturing cost of the resolver stator can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view showing a configuration of a resolver stator according to the first embodiment. [Diagram 2] FIG. 2 is a perspective view showing a configuration of a resolver stator according to the first embodiment. [Diagram 3] 2 is an enlarged perspective view showing a configuration of a protrusion of a resolver stator according to the first embodiment. FIG. [Figure 4] FIG. 4 is a perspective view showing a configuration of a resolver stator according to a modified example of the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Embodiment 1 A resolver stator according to a first embodiment will be described. Fig. 1 and Fig. 2 are perspective views showing the configuration of the resolver stator according to this embodiment. Fig. 1 shows the configuration of the upper surface side of the resolver stator. Fig. 2 shows the configuration of the lower surface side of the resolver stator. Fig. 3 is an enlarged perspective view showing the configuration of the protrusions of the resolver stator according to this embodiment.

[0010] As shown in FIGS. 1 to 3, the resolver stator includes a stator core 10, an insulating cover 20, and a plurality of windings 30. As shown in FIG.

[0011] The stator core 10 has an overall disk shape with an opening at the center. The stator core 10 has a core back 11 and a plurality of teeth 12. The core back 11 has an annular shape. Each of the plurality of teeth 12 protrudes inward from the inner circumferential surface of the core back 11 along the radial direction of the core back 11.

[0012] In the following description, the direction along the central axis of the core back 11 may be referred to as the "axial direction of the core back 11" or simply as the "axial direction." In a cross section perpendicular to the axial direction, the direction along the circumference centered on the central axis of the core back 11 may be referred to as the "circumferential direction of the core back 11" or simply as the "circumferential direction." In the same cross section, the direction along the radius of the core back 11 may be referred to as the "radial direction of the core back 11" or simply as the "radial direction."

[0013] The multiple windings 30 are wound around the multiple teeth 12, respectively. One of the multiple windings 30 is connected to another of the multiple windings 30 via a crossover wire (not shown). That is, each of the multiple windings 30 is connected to the other windings 30 via the crossover wire.

[0014] The insulating cover 20 functions as an insulator that electrically insulates the stator core 10 from the windings 30. The insulating cover 20 is formed integrally with the stator core 10 by, for example, insert molding.

[0015] The insulating cover 20 has a peripheral wall 21 , a plurality of tongues (not shown), a plurality of flanges 23 , and a plurality of projections 22 .

[0016] The peripheral wall 21 is formed along the inner peripheral surface of the core back 11. The peripheral wall 21 has a cylindrical shape coaxial with the core back 11. Each tooth 12 protrudes radially inward beyond the peripheral wall 21. The peripheral wall 21 has a first axial end face 21a and a second axial end face 21b as end faces perpendicular to the axial direction. The first axial end face 21a and the second axial end face 21b are both formed in an annular shape.

[0017] The first axial end face 21a is disposed on one side in the axial direction relative to the stator core 10. That is, the first axial end face 21a is disposed on the lower side relative to the stator core 10 in Figs. 1 to 3. The first axial end face 21a faces one side in the axial direction. A plurality of wall portions 24 are formed on the first axial end face 21a. The plurality of wall portions 24 protrude from the first axial end face 21a to one side in the axial direction. Each wall portion 24 has a shape of a partial cylindrical surface centered on the central axis of the core back 11. Each wall portion 24 is disposed between two adjacent windings 30 when viewed along the axial direction.

[0018] The crossover wires connecting the windings 30 to each other are disposed radially outside the wall portion 24 and are guided by the outer circumferential surface of the wall portion 24. That is, the crossover wires are disposed on one side of the stator core 10 in the axial direction.

[0019] The second axial end face 21b is disposed on the other axial side of the stator core 10. That is, the second axial end face 21b is disposed on the upper side of the stator core 10 in Figs. 1 to 3. The second axial end face 21b faces the other axial side. The second axial end face 21b is formed flat over its entire circumference. The distance in the axial direction from the stator core 10 to the second axial end face 21b is longer than the distance in the axial direction from the stator core 10 to the first axial end face 21a.

[0020] Each of the tongues protrudes from the peripheral wall 21 along the teeth 12 and surrounds the periphery of the teeth 12. The winding 30 is wound around the teeth 12 via the tongues. The tongues electrically insulate the teeth 12 and the winding 30 from each other.

[0021] Each of the multiple flange portions 23 is formed in a flange shape on the tip portion of the corresponding tooth 12. When each flange portion 23 is viewed in the radial direction, each flange portion 23 has a circular shape centered on the center of the tooth 12. The tip portion of each tooth 12 is exposed from the flange portion 23.

[0022] Each of the multiple protrusions 22 is disposed on the other axial side of the stator core 10. Each protrusion 22 protrudes inward in the radial direction from the peripheral wall 21. Each protrusion 22 is formed away from the tongue portion and the flange portion 23. Each protrusion 22 is formed integrally with the peripheral wall 21. In this embodiment, the number of protrusions 22 is the same as the number of teeth 12.

[0023] When viewed in the axial direction, each protrusion 22 is disposed between two adjacent windings 30. When viewed in the axial direction, each protrusion 22 is disposed so as not to overlap with the tongue and flange portions 23 formed around each of the two adjacent teeth 12. This makes it possible to prevent undercut portions from being formed in the insulating cover 20, so that the stator core 10 and the insulating cover 20 can be integrally molded without using a special mold.

[0024] Each of the protrusions 22 has a generally hexagonal cross-sectional shape. That is, a cross section perpendicular to the radial direction of each of the protrusions 22 has a flattened hexagonal shape in which the circumferential dimension is longer than the axial dimension. Each of the protrusions 22 has at least an upper surface 22a, a lower surface 22b, a first opposing surface 22c, and a second opposing surface 22d as side surfaces along the radial direction.

[0025] The upper surface 22a faces the other side in the axial direction. The upper surface 22a is formed on the same plane as the second axial end surface 21b of the peripheral wall 21. Each protrusion 22 does not protrude beyond the second axial end surface 21b toward the other side in the axial direction. The lower surface 22b faces one side in the axial direction.

[0026] The first opposing surface 22c faces one of two adjacent windings 30. The first opposing surface 22c is an arc-shaped concave curved surface centered on the center of the tooth 12 when viewed in the radial direction.

[0027] The second opposing surface 22d faces the other of the two adjacent windings 30. The second opposing surface 22d is an arc-shaped concave curved surface centered on the center of the tooth 12 when viewed in the radial direction.

[0028] The distance along the axial direction from the stator core 10 to the lower surface 22b of the protrusion 22 is defined as H1, and the distance along the axial direction from the stator core 10 to the other axial end of the flange portion 23 is defined as H2. Here, the distance H1 is longer than the distance H2 (H1>H2).

[0029] In the configuration of this embodiment, since the protrusions 22 are formed, it is possible to prevent foreign matter from entering the inside of the peripheral wall 21 from the outside along the axial direction. Therefore, the windings 30 can be protected by the protrusions 22 without using a ring-shaped protective cover as in the conventional art. Therefore, according to this embodiment, the manufacturing cost of the resolver stator can be reduced because the ring-shaped protective cover as in the conventional art can be omitted.

[0030] 1 to 3 are disposed between two adjacent windings 30 when viewed in the axial direction. However, the protrusions 22 may be disposed so as to overlap at least one of the multiple windings 30 when viewed in the axial direction. In this case, the protrusions 22 can be disposed directly above each winding 30, so that the windings 30 can be more reliably protected from foreign matter entering in the axial direction.

[0031] 1 to 3 are formed integrally with the peripheral wall 21. However, the protrusions 22 may be formed separately from the peripheral wall 21. In this case, there are fewer restrictions on the position of the protrusions 22 when considering the molding process of the insulating cover 20, and it becomes easier to arrange the protrusions 22 so that they overlap with the windings 30 when viewed along the axial direction.

[0032] As described above, the resolver stator according to this embodiment includes the stator core 10, the insulating cover 20, and a plurality of windings 30. The stator core 10 has an annular core back 11 and a plurality of teeth 12 protruding inward from the core back 11 in the radial direction of the core back 11. The insulating cover 20 has a cylindrical peripheral wall 21 formed along the inner circumferential surface of the core back 11, and protrusions 22 protruding inward from the peripheral wall 21 in the radial direction. The plurality of windings 30 are wound around the plurality of teeth 12, respectively.

[0033] One of the multiple windings 30 and another of the multiple windings 30 are connected via a crossover wire. The crossover wire is disposed on one side of the stator core 10 in the axial direction of the core back 11. When viewed along the axial direction, the protrusion 22 is disposed so as to overlap each of the multiple windings 30, or is disposed between two adjacent windings 30 among the multiple windings 30. The protrusion 22 is disposed on the other side of the stator core 10 in the axial direction.

[0034] According to this configuration, the windings 30 can be protected by the projections 22 without using a conventional ring-shaped protective cover, and therefore the manufacturing costs of the resolver stator can be reduced. Also, according to this configuration, the projections 22 are provided on the side opposite to the side on which the jumper wires are arranged, with the stator core 10 being taken as a reference, and therefore the projections 22 can be prevented from getting in the way when the jumper wires are wired.

[0035] In the resolver stator according to the present embodiment, the protrusion 22 is disposed between two adjacent windings 30 among the multiple windings 30 when viewed along the axial direction. The protrusion 22 has a first opposing surface 22c facing one of the two windings 30 and a second opposing surface 22d facing the other of the two windings 30. Both the first opposing surface 22c and the second opposing surface 22d are arc-shaped concave curved surfaces when viewed along the radial direction.

[0036] According to this configuration, when windings 30 are wound around teeth 12 using an automatic winding machine of a circular orbit type in which the orbit of the winding nozzle is circumferential, it is possible to increase the cross-sectional area of ​​protrusions 22 while preventing the winding nozzle from coming into contact with protrusions 22. Therefore, windings 30 can be easily formed using the automatic winding machine, and the strength of protrusions 22 can be ensured.

[0037] In the resolver stator according to the present embodiment, the peripheral wall 21 has a second axial end face 21b. The second axial end face 21b is disposed on the other axial side of the stator core 10. The second axial end face 21b faces the other axial side. The protrusion 22 does not protrude beyond the second axial end face 21b to the other axial side. Here, the second axial end face 21b is an example of an axial end face.

[0038] According to this configuration, it is possible to reduce unevenness on the second axial end face 21b, and therefore it is possible to reduce the axial dimension of the insulating cover 20 and simplify the shape of the insulating cover 20.

[0039] In the resolver stator according to the present embodiment, the insulating cover 20 further has a flange portion 23 formed in a flange shape at the tip portion of each of the multiple teeth 12. A distance H1 along the axial direction from the stator core 10 to the protrusion 22 is longer than a distance H2 along the axial direction from the stator core 10 to the end of the flange portion 23.

[0040] According to this configuration, foreign matter entering from the outside is likely to come into contact with the projections 22 before coming into contact with the windings 30. Therefore, the projections 22 can protect the windings 30 more reliably.

[0041] In the resolver stator according to the present embodiment, the projections 22 are formed integrally with the peripheral wall 21. According to this configuration, the number of parts of the insulating cover 20 can be reduced, and therefore the manufacturing cost of the resolver stator can be reduced.

[0042] In the resolver stator according to the present embodiment, the protrusions 22 are formed separately from the peripheral wall 21. With this configuration, restrictions on the arrangement position of the protrusions 22 are reduced, making it easier to arrange the protrusions 22 so that they overlap with the windings 30 when viewed along the axial direction. Therefore, the windings 30 can be protected more reliably by the protrusions 22.

[0043] FIG. 4 is a perspective view showing a configuration of a resolver stator according to a modified example of the present embodiment. As shown in FIG. 4, in this modified example, the protrusion 22 has a T-shaped cross section. The other configurations are the same as those of the resolver stator shown in FIGS. 1 to 3. In this modified example, the protrusion 22 is hollowed out compared to the configurations shown in FIGS. 1 to 3, so that the material cost of the insulating cover 20 can be reduced. In addition, in this modified example, it is possible to prevent the winding nozzle from coming into contact with the protrusion 22 not only in an automatic winding machine in which the orbit of the winding nozzle is circumferential, but also in an automatic winding machine in which the orbit of the winding nozzle is square. [Explanation of symbols]

[0044] 10 stator core, 11 core back, 12 teeth, 20 insulating cover, 21 peripheral wall, 21a first axial end face, 21b second axial end face, 22 protrusion, 22a upper face, 22b lower face, 22c first opposing face, 22d second opposing face, 23 flange portion, 24 wall portion, 30 winding.

Claims

1. A stator core (10) having an annular core back (11) and a plurality of teeth (12) protruding inward from the core back along a radial direction of the core back; an insulating cover (20) having a cylindrical peripheral wall (21) formed along an inner peripheral surface of the core back, and a protrusion (22) protruding inwardly along the radial direction from the peripheral wall; A plurality of windings (30) wound around the plurality of teeth, respectively; Equipped with one winding and another winding of the plurality of windings are connected via a jumper wire, the crossover wire is disposed on one side of the core back in an axial direction relative to the stator core, When viewed along the axial direction, the protrusion is disposed so as to overlap each of the plurality of windings, or is disposed between two adjacent windings among the plurality of windings, The resolver stator, wherein the protrusion is disposed on the other side in the axial direction relative to the stator core.

2. the protrusion is disposed between two adjacent windings among the plurality of windings when viewed along the axial direction, The projection has a first opposing surface (22c) facing one of the two windings and a second opposing surface (22d) facing the other of the two windings, The resolver stator according to claim 1 , wherein each of the first opposing surface and the second opposing surface is an arc-shaped concave curved surface when viewed along the radial direction.

3. The peripheral wall has an axial end surface (21b), the axial end surface is disposed on the other side in the axial direction relative to the stator core and faces the other side in the axial direction, 3. The resolver stator according to claim 1, wherein the projection does not protrude beyond the axial end surface toward the other side in the axial direction.

4. The insulating cover further has a flange portion (23) formed in a flange shape at a tip end portion of each of the plurality of teeth, 3. The resolver stator according to claim 1, wherein a distance (H1) along the axial direction from the stator core to the protrusion is longer than a distance (H2) along the axial direction from the stator core to the end of the flange portion.

5. 3. The resolver stator according to claim 1, wherein the projection is formed integrally with the peripheral wall.

6. 3. The resolver stator according to claim 1, wherein the projection is formed separately from the peripheral wall.

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