Ring-shaped stator structure

Abstract

The present invention provides a ring-shaped stator structure that reduces the diameter and improves positioning accuracy when attached to other devices. [Solution] The annular stator structure 11 comprises an annular stator core 20 and insulators 30 provided on both sides of the annular stator core 20 in the axial direction. The annular stator core 20 has an annularly formed core back 22 and a plurality of protruding magnetic poles 21 that protrude radially from the core back 22. The core back 22 has a stator core through hole 25 that penetrates through it in the axial direction. The insulator 30 has an insulator through hole 31 that overlaps with the stator core through hole 25 and is larger than the stator core through hole 25 when viewed in the axial direction.

Description

Technical Field

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[0001] This invention relates to an annular stator structure.

Background Art

[0002] As a conventional annular stator structure, the one described in Patent Document 1 is known. The annular stator structure described in this Patent Document 1 is provided in an inner rotor type resolver, and this resolver is mounted on the end case of the motor case. A knock pin is provided on the end case, and a positioning hole that can be fitted to the knock pin is formed in the stator core of the annular stator structure. Then, by fitting the knock pin into the positioning hole, the resolver is positioned with respect to the motor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0006] This invention was made to solve these problems and aims to provide a ring-shaped stator structure that can reduce the diameter and improve positioning accuracy when attached to other devices. [Means for solving the problem]

[0007] To solve the above problems, the annular stator structure of the present invention comprises an annular stator core and insulators provided on both sides of the annular stator core in the axial direction, the annular stator core having an annularly formed core back and a plurality of protruding magnetic poles protruding radially from the core back, the core back having a stator core through hole that penetrates in the axial direction, and the insulator having an insulator through hole that overlaps with the stator core through hole and is larger than the stator core through hole when viewed in the axial direction.

[0008] Furthermore, the outer diameter of the core back may be less than or equal to the outer diameter of the insulator. Furthermore, the stator core through-holes and insulator through-holes may be formed in positions that overlap with the protruding magnetic poles when viewed along the radial direction. Furthermore, the device may further include a stator core exposed portion formed between the edge of the insulator through-hole and the edge of the stator core through-hole, and a positioning pin, wherein the positioning pin has a main body, a tip portion provided at at least one end of the main body and having a smaller diameter than the main body, and a flat portion formed between the outer diameter of the main body and the outer diameter of the tip portion, the tip portion being inserted into the stator core through-hole and the flat portion contacting the stator core exposed portion. [Effects of the Invention]

[0009] The annular stator structure according to this invention has a stator core through-hole that penetrates the core back along the axial direction, and the insulator has an insulator through-hole that overlaps with the stator core through-hole when viewed along the axial direction and is larger than the stator core through-hole. Therefore, the diameter of the annular stator structure can be reduced and the positioning accuracy when attached to other devices can be improved. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front cross-sectional view of a resolver according to an embodiment. [Figure 2] This is a right side view of the ring-shaped stator structure shown in Figure 1. [Figure 3] Figure 1 is a left side view of the ring-shaped stator structure. [Figure 4] Figure 2 is a magnified view of the insulator through-hole shown. [Figure 5] Figure 1 is a perspective view of the positioning pin. [Figure 6] Figure 1 is an enlarged cross-sectional view of the insulator through-hole. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the accompanying drawings. Figure 1 is a front cross-sectional view of a resolver according to this embodiment. The resolver 10 is a rotation angle sensor for detecting the rotation angle of the motor 50, and is attached to the motor case 52 on one end of the motor 50 by fastening with bolts (not shown). The resolver 10 is an inner rotor type VR resolver and has a ring-shaped stator structure 11, a rotor 28 rotatably mounted around a resolver shaft 27, and a resolver cover 29 that covers the ring-shaped stator core 20 and rotor 28 provided on the ring-shaped stator structure 11. The motor 50 has a motor shaft 51 that is rotatably supported in the motor case 52 via a bearing 53, and one end of the motor shaft 51 is coaxially connected to the resolver shaft 27.

[0012] The annular stator structure 11 includes an annular stator core 20 formed by laminating electromagnetic steel sheets, and a resin insulator 30 integrally molded with the annular stator core 20 by insert molding or the like. At least one positioning pin 40 is attached to the motor case 52 along the direction in which the resolver shaft 27 extends. The positioning pin 40 is inserted into an insulator through hole 31 formed in the insulator 30 along the direction in which the resolver shaft 27 extends, and a stator core through hole 25 formed in the annular stator core 20 along the direction in which the resolver shaft 27 extends, thereby positioning the resolver 10 relative to the motor 50. The stator core through hole 25 constitutes a positioning hole.

[0013] Furthermore, the insulator 30 is provided with terminal holding portions 33 that protrude outward along the radial direction. The terminal holding portions 33 hold a plurality of terminal pins 35, which are provided for connecting to external equipment and outputting measurement signals from the resolver 10. Stator windings 23, which are wound around the protruding magnetic poles of the ring-shaped stator core 20, are connected to the terminal pins 35.

[0014] Figure 2 is a right side view of the annular stator structure 11 shown in Figure 1, viewed along the direction of arrow A in Figure 1. In other words, Figure 2 is a view of the annular stator structure 11 shown in Figure 1, viewed from the motor 50 side. The annular stator core 20 has a plurality of protruding magnetic poles 21 that protrude inward along the radial direction, and an annular core back 22 that connects each protruding magnetic pole 21 along the circumferential direction. Stator windings 23 are wound around each protruding magnetic pole 21 via an insulator 30.

[0015] Furthermore, insulator through-holes 31 are formed in the insulator 30 at positions radially outward from each protruding magnetic pole 21. Inside each insulator through-hole 31, the core back 22 is exposed, forming a stator core exposed portion 24. Circular stator core through-holes 25 are formed in the stator core exposed portion 24 at intervals along the circumferential direction. That is, the multiple stator core exposed portions 24 arranged along the circumferential direction are arranged alternately with those having stator core through-holes 25 and those without.

[0016] Figure 3 is a left side view of the annular stator structure shown in Figure 1, viewed along the direction of arrow B in Figure 1. In other words, Figure 3 is a view of the annular stator structure 11 shown in Figure 2, viewed from the back. On the side opposite to the side attached to the motor, the core back 22 is not covered by the insulator 30 and is exposed. Also, the diameter of the outer diameter portion 32 of the insulator 30 is formed to be larger than the diameter of the outer diameter portion 26 of the core back 22, so the core back 22 is not exposed.

[0017] Figure 4 is an enlarged view of the insulator through-hole shown in Figure 2. The insulator through-hole 31 has an elliptical shape with a portion missing, and a stator core exposed portion 24, which is a flat surface inside it where the core back 22 (see Figure 2) is exposed, is formed. A stator core through-hole 25 is formed in this stator core exposed portion 24, and the width of the opening of the insulator through-hole 31 is larger than the diameter of the stator core through-hole 25.

[0018] FIG. 5 is a perspective view of the positioning pin 40 shown in FIG. 1. The positioning pin 40 has a cylindrical main body portion 41 and a cylindrical tip portion 43 that extends from an end portion 42 of the main body portion 41 and has a diameter smaller than the diameter of the main body portion 41. Due to the difference between the diameter of the main body portion 41 and the diameter of the tip portion 43 described above, an annular flat portion 44 is formed on the radially inner side of the end portion 42 of the main body portion 41. The diameter and length of the tip portion 43 are formed to be of a size that can be fitted into the stator core through-hole 25.

[0019] FIG. 6 is an enlarged cross-sectional view of the insulator through-hole shown in FIG. 1. The stator core through-hole 25 and the insulator through-hole 31 each extend along the axial direction of the annular stator core 20, and the stator core through-hole 25 is connected to the insulator through-hole 31. The stator core exposed portion 24 spreads in a stepped manner at the connection portion between the stator core through-hole 25 and the insulator through-hole 31. The tip portion 43 of the positioning pin 40 fixed to the motor case 52 is fitted into the stator core through-hole 25. Also, the flat portion 44 of the positioning pin 40 is in contact with the stator core exposed portion 24.

[0020] Next, the procedure for attaching the resolver 10 to the motor 50 will be described. As shown in FIG. 1, when attaching the resolver 10 to the motor 50, at least one positioning pin 40 is fixed to the motor case 52 on one end side of the motor 50 along the direction in which the resolver shaft 27 extends. Next, as shown in FIG. 6, the tip portion 43 of the positioning pin 40 is inserted into the stator core through-hole 25 of the annular stator structure 11 of the resolver 10 to perform circumferential positioning of the resolver 10 with respect to the motor 50.

[0021] After positioning the resolver 10, the annular stator structure 11 is fastened to the motor case 52 with a fastening member such as a bolt (not shown), whereby the resolver 10 can be attached to the motor 50.

[0022] In this embodiment, the opening of the insulator through-hole 31 is larger than the diameter of the stator core through-hole 25, and the diameter of the tip portion 43 of the positioning pin is larger than the diameter of the main body portion 41, so the tip portion 43 can be easily inserted into the stator core through-hole 25.

[0023] Furthermore, in conventional ring-shaped stator structures, if the core back portion of the stator core is covered by an insulator, positioning holes for the positioning pins were sometimes formed on the insulator. In contrast, in this embodiment, the tip portion 43 of the positioning pin 40 is formed to fit into the stator core through-hole 25, and the flat portion 44 of the positioning pin 40 and the flat portion of the exposed stator core 24 are in contact with each other on a plane. Moreover, the stator core through-hole 25 and the exposed stator core 24, and the tip portion 43 and the flat portion 44 of the positioning pin 40 are all made of metal. Therefore, in this embodiment, positioning is achieved by the contact between the stator core through-hole 25 and the exposed stator core 24, which are made of metal that has better dimensional accuracy than resin materials, and the tip portion 43 and the flat portion 44 of the positioning pin 40. Therefore, the diameter of the outer diameter portion 32 of the insulator 30 is formed to be larger than the diameter of the outer diameter portion 26 of the core back 22, which has the advantage of providing good positioning accuracy even in a ring-shaped stator core 20 in which the core back 22 is not exposed.

[0024] Furthermore, in conventional annular stator structures, in order to avoid providing positioning holes in the insulator located at the core back, a positioning section made of a metal member was sometimes formed on the radially outer side of the core back. However, such annular stator structures had the problem of increasing the overall diameter of the annular stator structure and resolver. In contrast, in this embodiment, by providing the stator core through-hole 25 and the insulator through-hole 31 at the core back 22, it is possible to reduce the diameter of the annular stator structure 11 and the resolver 10 while improving positioning accuracy.

[0025] As described above, the annular stator structure 11 according to this embodiment comprises an annular stator core 20 and insulators 30 provided on both sides of the annular stator core 20 in the axial direction. The annular stator core 20 has an annularly formed core back 22 and a plurality of protruding magnetic poles 21 that protrude radially from the core back 22. The core back 22 has a stator core through hole 25 that penetrates through it in the axial direction. The insulators 30 have insulator through holes 31 that overlap with the stator core through hole 25 when viewed in the axial direction and are larger than the stator core through hole 25. Therefore, the diameter of the annular stator structure 11 can be reduced, and the positioning accuracy when attaching the resolver 10 to the motor 50 can be improved.

[0026] Furthermore, since the diameter of the core back 22 is less than or equal to the diameter of the insulator 30, the diameter of the ring-shaped stator structure 11 can be reduced, and the positioning accuracy when attaching the resolver 10 to the motor 50 can be improved.

[0027] Furthermore, since the stator core through-hole 25 and the insulator through-hole 31 are formed in positions that overlap with the protruding magnetic pole 21 when viewed along the radial direction, distortion of the annular stator core 20 and the insulator 30 when the resolver 10 is attached to the motor 50 can be suppressed.

[0028] Furthermore, the ring-shaped stator structure 11 has a stator core exposed portion 24 formed between the edge of the insulator through hole 31 and the edge of the stator core through hole 25. A positioning pin 40 has a main body portion 41, a tip portion 43 provided at least one end 42 of the main body portion 41 and having a smaller diameter than the main body portion 41, and a flat portion 44 formed between the outer diameter of the main body portion 41 and the outer diameter of the tip portion 43. The tip portion 43 of the positioning pin 40 is inserted into the stator core through hole 25, and the flat portion 44 contacts the stator core exposed portion 24. As a result, the stator core through hole 25 and the stator core exposed portion 24, which are made of metal with better dimensional accuracy than resin members, come into contact with the tip portion 43 and the flat portion 44 of the positioning pin 40, thereby improving the positioning accuracy when attaching the resolver 10 to the motor 50.

[0029] In this embodiment, the stator core through-hole 25 was a round hole, and the insulator through-hole 31 was an elliptical shape with a portion missing. However, the shapes of the stator core through-hole 25 and the insulator through-hole 31 may be any other shape. Furthermore, the shapes of the main body portion 41 and the tip portion 43 of the positioning pin 40 may be any suitable shape that matches the shapes of the stator core through-hole 25 and the insulator through-hole 31.

[0030] Furthermore, in this embodiment, the stator core through holes 25 were provided at intervals along the circumferential direction in the stator core exposed portion 24, but the arrangement of the stator core through holes 25 may be any other arrangement that is suitable for positioning the ring-shaped stator structure 11.

[0031] Furthermore, although the resolver 10 in this embodiment is an inner rotor type VR resolver and is provided on the motor 50, the resolver 10 may be configured with any other configuration, such as a brushless resolver, or the resolver 10 may be attached to a device other than a motor to detect the rotation of that device.

[0032] Although preferred embodiments have been described in detail above, the invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0033] The various aspects of this disclosure are summarized below as an appendix. (Note 1) Ring-shaped stator core (20), The insulators (30) provided on both sides in the axial direction of the ring-shaped stator core (20) and Equipped with, The aforementioned ring-shaped stator core (20) is A ring-shaped core back (22), Multiple protruding magnetic poles (21) protruding radially from the core back (22) and It has, The core back (22) has a stator core through hole (25) that penetrates along the axial direction, The insulator (30) has a ring-shaped stator structure in which, when viewed along the axial direction, it overlaps with the stator core through hole (25) and has an insulator through hole (31) that is larger than the stator core through hole (25). (Note 2) The annular stator structure as described in Appendix 1, wherein the outer diameter of the core back (22) is less than or equal to the outer diameter of the insulator (30). (Note 3) The annular stator structure according to Appendix 1 or 2, wherein the stator core through-hole (25) and the insulator through-hole (31) are formed in positions that overlap with the protruding magnetic pole (21) when viewed along the radial direction. (Note 4) A stator core exposed portion (24)) is formed between the edge of the insulator through hole (31) and the edge of the stator core through hole (25), Positioning pin (40) and Furthermore, The positioning pin (40) is Main body (41) and A tip portion (43) is provided at at least one end (42) of the main body portion (41) and has a smaller diameter than the main body portion (41), A flat portion (44) formed between the outer diameter of the main body portion (41) and the outer diameter of the tip portion (43) It has, The annular stator structure according to any one of the appendices 1 to 3, characterized in that the tip portion (43) is inserted into the stator core through hole (25) and the flat portion (44) is in contact with the stator core exposed portion (24). [Explanation of Symbols]

[0034] 20 Ring-shaped stator core, 21 Protruding magnetic pole, 22 Core back, 24 Stator core exposed portion, 25 Stator core through hole, 30 Insulator, 31 Insulator through hole, 40 Positioning pin, 41 Main body portion, 42 End portion, 43 Tip portion, 44 Flat portion.

Claims

1. Ring-shaped stator core (20), The insulators (30) provided on both sides in the axial direction of the ring-shaped stator core (20) and Equipped with, The aforementioned ring-shaped stator core (20) is A ring-shaped core back (22), Multiple protruding magnetic poles (21) protruding radially from the core back (22) and It has, The core back (22) has a stator core through hole (25) that penetrates along the axial direction, The insulator (30) has a ring-shaped stator structure in which, when viewed along the axial direction, it overlaps with the stator core through hole (25) and has an insulator through hole (31) that is larger than the stator core through hole (25).

2. The annular stator structure according to claim 1, wherein the outer diameter of the core back (22) is less than or equal to the outer diameter of the insulator (30).

3. The annular stator structure according to claim 1 or 2, wherein the stator core through-hole (25) and the insulator through-hole (31) are formed in positions that overlap with the protruding magnetic pole (21) when viewed along the radial direction.

4. A stator core exposed portion (24) is formed between the edge of the insulator through hole (31) and the edge of the stator core through hole (25), Positioning pin (40) and Furthermore, The positioning pin (40) is The main body (41) and A tip portion (43) is provided at at least one end (42) of the main body portion (41) and has a smaller diameter than the main body portion (41), A flat portion (44) formed between the outer diameter of the main body portion (41) and the outer diameter of the tip portion (43) It has, The annular stator structure according to claim 1 or 2, characterized in that the tip portion (43) is inserted into the stator core through hole (25) and the flat portion (44) is in contact with the stator core exposed portion (24).

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