Stator and rotating electric machine

Abstract

A stator (11) is provided with: stator cores (20, 70) having pole teeth (23); a bobbin (30) covering the pole teeth; a coil (40) wound around the bobbin; and a temperature sensor (50) that detects the temperature of the coil. The coil has an inner peripheral surface (41) in contact with the bobbin. The bobbin has grooves (34, 83) at positions facing the inner peripheral surface of the coil. The temperature sensor is disposed in the groove portion. The temperature sensor is located on the inner peripheral side of the coil.

Description

[0001] Cross-reference to related applications

[0002] This application is based on Japanese Patent Application No. 2022-096794 filed on June 15, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0003] The invention relates to a stator and a rotating electric machine. Background Art

[0004] For example, the stator described in Patent Document 1 includes: a stator core having pole teeth, a winding frame covering the pole teeth, and a coil wound on the winding frame. In addition, the stator includes a temperature sensor for detecting the temperature of the coil. The temperature sensor is mounted on the winding frame in a manner that contacts the side surface of the coil in the radial direction of the stator. According to such a structure, it is possible to perform drive control of the rotating electric machine based on the temperature of the coil detected by the temperature sensor.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2020-174488

[0008] In the above-mentioned stator, attention has been paid to the positional relationship between the coil and the temperature sensor, and studies have been conducted on how to improve the temperature tracking performance of the temperature sensor with respect to the coil. Summary of the invention

[0009] An object of the present invention is to provide a stator and a rotating electrical machine capable of improving the temperature follow-up performance of a temperature sensor with respect to a coil.

[0010] In the first embodiment of the present invention, the stator comprises: a stator core having pole teeth; a winding frame covering the pole teeth; a coil wound on the winding frame; and a temperature sensor detecting the temperature of the coil, wherein the coil has an inner circumferential surface in contact with the winding frame, the winding frame has a groove at a position opposite to the inner circumferential surface of the coil, the temperature sensor is arranged in the groove, and the temperature sensor is located on the inner circumferential side of the coil.

[0011] In a second embodiment of the present invention, a rotating electric machine comprises a stator and a rotor opposite to the stator, wherein the stator comprises: a stator core having pole teeth; a winding frame covering the pole teeth; a coil wound on the winding frame; and a temperature sensor detecting the temperature of the coil, wherein the coil has an inner circumferential surface in contact with the winding frame, the winding frame has a groove at a position opposite to the inner circumferential surface of the coil, the temperature sensor is arranged in the groove, and the temperature sensor is located on the inner circumferential side of the coil.

[0012] According to the above-described stator and rotating electrical machine, the temperature sensor can appropriately receive the heat flux generated on the inner circumference of the coil from the coil, thereby improving the temperature tracking performance of the temperature sensor with respect to the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above-mentioned and other objects, features and advantages of the present invention will become more apparent through the following detailed description with reference to the accompanying drawings. The accompanying drawings are as follows:

[0014] Figure 1 is a schematic diagram of a rotating electrical machine in an embodiment,

[0015] Figure 2 This is a three-dimensional diagram of the split core and winding frame in the stator of the same type.

[0016] Figure 3 This is a cross-sectional view of the stator of the same type.

[0017] Figure 4 This is a cross-sectional view of the stator of the same type.

[0018] Figure 5 is a cross-sectional view of a stator of a modified example,

[0019] Figure 6 is a schematic cross-sectional view of a stator according to a modified example,

[0020] Figure 7 is a cross-sectional view of a stator of the same modified example,

[0021] Figure 8 is a schematic top view of a stator of a modified example,

[0022] Fig. 9 is a schematic diagram of the arrangement of the temperature sensor in the same modification example as viewed from the radially outer side,

[0023] Fig.10 It is a schematic plan view showing a part of a stator according to a modified example. DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of a stator and a rotating electrical machine will be described with reference to the accompanying drawings. In each of the drawings, for the sake of convenience of description, a part of the structure is sometimes exaggerated or simplified. In addition, the dimensional ratios of each part are sometimes different in each of the drawings.

[0025] like Figure 1 As shown, the rotary electric machine 10 of the present embodiment includes a stator 11 and a rotor 12 facing the stator 11. The stator 11 is annular. The rotor 12 is arranged inside the stator 11. The rotor 12 has a rotating shaft 13. The rotor 12 faces the stator 11 in the radial direction, for example.

[0026] (Structure of stator 11)

[0027] The stator 11 includes a stator core 20, a winding frame 30, a coil 40, and a temperature sensor 50. The stator core 20 includes a plurality of split cores 21 arranged in a ring shape along the circumferential direction of the stator 11. The stator core 20 of the present embodiment includes, for example, twelve split cores 21. Each split core 21 is made of, for example, a magnetic metal material. In addition, in the following description, the circumferential direction of the stator 11, the radial direction of the stator 11, and the axial direction of the stator 11 are sometimes simply referred to as "circumferential direction", "radial direction", and "axial direction", respectively.

[0028] Each split core 21 includes a back yoke 22 and pole teeth 23 extending radially from the back yoke 22. The split cores 21 are arranged circumferentially so that the back yokes 22 form an annular shape as a whole. Each pole tooth 23 extends radially.

[0029] In each split core 21, the pole tooth 23 protrudes radially inward from the inner surface of the back yoke 22, for example. The tip end of the pole tooth 23 faces the axis L1 of the stator 11. The base end of the pole tooth 23 is the radially outer end of the pole tooth 23.

[0030] A bobbin 30 is provided on each split core 21. The coil 40 is wound on each bobbin 30. That is, the bobbin 30 is sandwiched between the split core 21 and the coil 40. Thus, the bobbin 30 electrically insulates the split core 21 from the coil 40. In addition, one split core 21, one bobbin 30, and one coil 40 constitute one integrated component.

[0031] (Structure of winding frame 30)

[0032] Figure 2 The split core 21 and the winding frame 30 provided on the split core 21 are shown. The winding frame 30 is made of an insulator such as a synthetic resin. As a material of the winding frame 30, for example, epoxy resin or the like can be used. The winding frame 30 is molded, for example, with respect to the split core 21. That is, it is formed integrally with the split core 21. As a result, the winding frame 30 and the split core 21 can be in a state of being in close contact.

[0033] In addition, as a structure different from the structure of the present embodiment, for example, when a winding frame produced separately from the split core 21 is later mounted on the split core 21, a large gap may be generated between the split core 21 and the winding frame. In this regard, by molding the winding frame 30 with respect to the split core 21 as in the present embodiment, the gap between the split core 21 and the winding frame 30 can be eliminated or made extremely small.

[0034] Figure 3 : represents a cross section perpendicular to the radial direction in the pole teeth 23 and the winding frame 30. Figure 3 As shown, the pole tooth 23 has an axial end face 24 and a circumferential end face 25. The axial end face 24 is respectively provided at the end of one axial side and the end of the other axial side of the pole tooth 23. The circumferential end face 25 is provided at the end of one circumferential side and the end of the other circumferential side of the pole tooth 23. The cross-sectional shape of the pole tooth 23 orthogonal to the radial direction is, for example, a rectangular shape. Each axial end face 24 is, for example, a plane perpendicular to the axial direction. Each circumferential end face 25 is, for example, a plane parallel to the axial direction.

[0035] The bobbin 30 includes a first covering portion 31 covering the axial end surface 24 of the pole tooth 23 and a second covering portion 32 covering the circumferential end surface 25 of the pole tooth 23. A pair of first covering portions 31 are provided corresponding to the axial end surfaces 24 on both axial sides of the pole tooth 23, respectively. A pair of second covering portions 32 are provided corresponding to the circumferential end surfaces 25 on both circumferential sides of the pole tooth 23, respectively. The portion of the bobbin 30 covering the pole tooth 23 is formed into a ring shape surrounding the pole tooth 23 by the first covering portion 31 and the second covering portion 32.

[0036] Each coil 40 is formed, for example, by winding a single conductor multiple turns. The conductor forming the coil 40 is wound multiple turns around the outer surfaces of the first covering portion 31 and the second covering portion 32. The first covering portion 31 and the second covering portion 32 are sandwiched between the coil 40 and the pole teeth 23. The inner circumferential surface 41 of the coil 40 is in contact with each first covering portion 31 and each second covering portion 32 of the bobbin 30.

[0037] In addition, the cross-sectional shape of the wire forming the coil 40 is, for example, a circular shape. In addition, the wire is wound in series on the bobbin 30 by a winding machine (not shown), such as a nozzle type or a flying fork type. That is, the coil 40 is not a so-called cassette coil made separately, which is mounted on the pole teeth 23 from above the bobbin 30. Therefore, the gap between the first covering portion 31 and the second covering portion 32 of the bobbin 30 and the coil 40 can be suppressed to be small. Therefore, the space factor of the coil 40 in the slit formed between the pole teeth 23 adjacent in the circumferential direction can be increased.

[0038] like Figure 2-3As shown, the first covering portion 31 has a concave-convex guide portion 33, which guides the conductive wire forming the coil 40. The guide portion 33 is provided along the winding direction of the coil 40. The first covering portion 31 has, for example, a pair of guide portions 33. The pair of guide portions 33 are provided at both circumferential ends of the first covering portion 31. Each guide portion 33 is bent from the central side of the circumferential direction of the first covering portion 31 to the end portion so that the thickness in the axial direction of the first covering portion 31 becomes smaller.

[0039] Each guide portion 33 has a plurality of convex portions 33a and a plurality of concave portions 33b. The convex portions 33a and the concave portions 33b are alternately arranged in the radial direction. Each convex portion 33a and each concave portion 33b extend along the winding direction of the coil 40. The conductive wire forming the coil 40 is sequentially wound along the concave portions 33b in a manner accommodated in each concave portion 33b.

[0040] (Structure of Groove 34)

[0041] like Figure 3 and Figure 4 As shown, the bobbin 30 has a groove 34 at a position opposite to the inner circumferential surface 41 of the coil 40. The groove 34 is provided, for example, at the axial end of the bobbin 30, that is, the first covering portion 31. The groove 34 is opposite to the coil end portion 42 of the coil 40 in the axial direction of the stator 11. The coil end portion 42 is the axial end of the coil 40 and is a portion provided along the first covering portion 31 in the coil 40.

[0042] The groove portion 34 is formed so as to extend in the radial direction on the surface of the first covering portion 31. The groove portion 34 is provided, for example, between the guide portions 33 provided at both ends in the circumferential direction of the first covering portion 31. The groove portion 34 is provided at the circumferential center portion of the first covering portion 31. That is, the groove portion 34 is provided at the same position as the center portion C1 of the pole tooth 23 in the circumferential direction of the stator 11.

[0043] The groove portion 34 has an opening portion 35 that opens toward the coil 40. In the groove portion 34 of the present embodiment, the opening portion 35 opens in the direction along the axial direction. The opening portion 35 is closed by the inner peripheral surface 41 of the coil end portion 42.

[0044] (Structure of Temperature Sensor 50)

[0045] The stator 11 has one or more temperature sensors 50. The temperature sensor 50 is, for example, a thermistor. The temperature sensor 50 is, for example, circular when viewed from the radial direction.

[0046] The temperature sensor 50 is arranged in the groove portion 34. The temperature sensor 50 is located on the inner peripheral side of the coil 40. The temperature sensor 50 is in contact with the inner peripheral surface 41 of the coil 40, for example. The temperature sensor 50 is fixed by being pressed between the inner peripheral surface 41 of the coil 40 and the groove portion 34, for example. That is, the temperature sensor 50 is provided in a manner sandwiched between the inner peripheral surface 41 of the coil 40 and the groove portion 34. In addition, in the axial direction of the stator 11, the dimension from the bottom surface of the groove portion 34 to the inner peripheral surface 41 of the coil 40 is set to be smaller than the dimension of the temperature sensor 50.

[0047] like Figure 3 As shown, in the circumferential direction of the stator 11, the dimension D1 of the groove 34 is set larger than the dimension D2 of the temperature sensor 50. Thus, for example, gaps S are formed between the groove 34 and the temperature sensor 50 on both sides in the circumferential direction.

[0048] like Figure 4 As shown, in the radial direction of the stator 11, the center portion C2 of the temperature sensor 50 is located on the inner diameter side relative to the center portion C3 of the coil 40. Therefore, the temperature sensor 50 is arranged at a position close to the inner diameter of the stator 11 in the radial direction.

[0049] like Figure 2 and Figure 4 As shown, the groove portion 34 has a positioning portion 36, and the positioning portion 36 positions the temperature sensor 50 in the radial direction of the stator 11. The positioning portion 36 protrudes from the inner surface of the groove portion 34 in the axial direction, for example. The inner end of the temperature sensor 50 in the radial direction of the stator 11 abuts against the positioning portion 36. As a result, the movement of the temperature sensor 50 to the radial inside is restricted by the positioning portion 36. In addition, the temperature sensor 50 has a lead 51 for outputting detection information. The lead 51 is led out from the outer end of the temperature sensor 50 in the radial direction of the stator 11.

[0050] The operation of this embodiment will be described.

[0051] The rotor 12 rotates by interaction with the rotating magnetic field generated in the stator 11 by energizing each coil 40. At this time, the coil 40 generates heat due to the energization. Here, the temperature sensor 50 for detecting the temperature of the coil 40 is arranged on the inner circumference side of the coil 40 where the heat flux from the coil 40 is larger. Therefore, the temperature sensor 50 can detect the temperature of the coil 40 with good tracking performance.

[0052] The effects of this embodiment will be described.

[0053] (1) The temperature sensor 50 disposed in the groove 34 is located on the inner circumference side of the coil 40. According to this structure, the temperature sensor 50 can appropriately receive the heat flux generated on the inner circumference side of the coil 40 from the coil 40. Therefore, the temperature tracking performance of the temperature sensor 50 with respect to the coil 40 can be improved.

[0054] (2) The groove portion 34 has an opening portion 35 that opens toward the inner peripheral surface 41 of the coil 40. The opening portion 35 is closed by the inner peripheral surface 41 of the coil 40. Moreover, the temperature sensor 50 is in contact with the inner peripheral surface 41 of the coil 40. According to this structure, the temperature sensor 50 is in contact with the coil 40, thereby further improving the temperature tracking performance of the temperature sensor 50 with respect to the coil 40.

[0055] (3) The temperature sensor 50 is fixed by being pressed between the inner circumferential surface 41 of the coil 40 and the groove portion 34. According to this structure, the temperature sensor 50 can be firmly fixed by being pressed. In addition, since the temperature sensor 50 is strongly pressed against the inner circumferential surface 41 of the coil 40, the temperature tracking performance of the temperature sensor 50 with respect to the coil 40 can be further improved.

[0056] (4) The groove portion 34 is provided at the same position as the center portion C1 of the pole tooth 23 in the circumferential direction of the stator 11. According to this configuration, the temperature sensor 50 can further improve the temperature tracking performance of the coil 40.

[0057] (5) In the radial direction of the stator 11, the central portion C2 of the temperature sensor 50 is located on the inner diameter side compared to the central portion C3 of the coil 40. Since more AC copper loss is generated on the radial inner diameter side of the coil 40, the temperature on the inner diameter side tends to be higher than on the radial outer diameter side of the coil 40. Therefore, in the radial direction of the stator 11, by configuring the temperature sensor 50 in such a manner that the central portion C2 of the temperature sensor 50 is located on the inner diameter side compared to the central portion C3 of the coil 40, the temperature tracking performance of the temperature sensor 50 with respect to the coil 40 can be further improved.

[0058] (6) The groove portion 34 has the positioning portion 36 for positioning the temperature sensor 50 in the radial direction of the stator 11. According to this configuration, the positioning portion 36 makes it easier to attach the temperature sensor 50 to the groove portion 34.

[0059] (7) In the circumferential direction of the stator 11, the dimension D1 of the groove 34 is larger than the dimension D2 of the temperature sensor 50. According to this structure, a gap S can be provided between the temperature sensor 50 and the groove 34 in the circumferential direction of the stator 11. Thus, the stress applied to the temperature sensor 50 from the bobbin 30 can be suppressed to be small, and the temperature sensor 50 can be arranged in the groove 34.

[0060] (8) The bobbin 30 has a concave-convex guide portion 33 for guiding the coil 40. The guide portion 33 allows the coil 40 to be appropriately brought into close contact with the bobbin 30. This facilitates heat conduction from the coil 40 to the bobbin 30, and as a result, the temperature of the portion of the bobbin 30 that the temperature sensor 50 contacts in the bobbin 30 is close to the temperature of the coil 40. Therefore, the temperature tracking property of the temperature sensor 50 with respect to the coil 40 can be further improved.

[0061] (9) The guide portions 33 are provided at both circumferential ends of the first covering portion 31, and the groove portion 34 is provided between the pair of guide portions 33. According to this structure, even if the winding of the coil 40 can be guided by the pair of guide portions 33, the groove portion 34 can be provided at the same position as the circumferential center portion C1 of the pole tooth 23.

[0062] This embodiment can be implemented with modifications as follows. This embodiment and the following modifications can be implemented in combination with each other within a range without technical contradiction.

[0063] like Figure 5 As shown in FIG. 1 , the temperature sensor 50 may also be fixed to the groove portion 34 by an adhesive G. According to this structure, the temperature sensor 50 can be more firmly fixed to the groove portion 34 by the adhesive G. Figure 5 In the illustrated structure, since the temperature sensor 50 is fixed to the groove portion 34 by the adhesive G, it is possible to install the temperature sensor 50 away from the inner peripheral surface 41 of the coil 40 .

[0064] like Figure 6 and Figure 7 As shown in FIG. 1 , the stator 11 may include a resin molded portion 60 covering the coils 40. The resin molded portion 60 collectively covers the plurality of coils 40. Figure 6 As shown, the resin molded portion 60 has a first portion 61 sandwiched between the coils 40 adjacent to each other in the circumferential direction. Figure 7 As shown in FIG. 1 , the resin molded portion 60 has a second portion 62 that covers the axially outer sides of each coil 40 in a concentrated manner. The second portion 62 also covers the axial end faces of each bobbin 30 and each split core 21 in a concentrated manner.

[0065] exist Figure 6 and Figure 7 In the stator 11 having the structure shown, the integral component including the split core 21, the bobbin 30 and the coil 40 is arranged in a ring shape, and the coils 40 are electrically connected by, for example, a bus bar, etc. Then, for example, the resin molded portion 60 is molded so as to collectively cover the coils 40, the bobbin 30, the temperature sensor 50 and the bus bar, etc.

[0066] like Figure 7As shown, the second portion 62 of the resin molded portion 60 has a filling portion 63 that enters the groove portion 34. The filling portion 63 is in close contact with the inner peripheral surface 41 of the coil 40, the surface of the temperature sensor 50, and the inner surface of the groove portion 34. According to such a structure, the heat of the coil 40 can be appropriately transferred to the temperature sensor 50 via the filling portion 63.

[0067] The resin molded portion 60 is formed of, for example, a synthetic resin. As the material of the resin molded portion 60, for example, a material obtained by mixing aluminum powder or the like in epoxy resin or unsaturated polyester resin can be used. The thermal conductivity of the resin molded portion 60 is set to, for example, not less than 2.0 (W / m·K) and not more than 5.0 (W / m·K). The thermal conductivity of the winding frame 30 is set to be greater than the thermal conductivity of the resin molded portion 60. In this way, the thermal conductivity of the winding frame 30 becomes higher, thereby easily causing heat conduction from the coil 40 to the winding frame 30. As a result, the temperature of the portion of the winding frame 30 that the temperature sensor 50 in the winding frame 30 contacts is close to the temperature of the coil 40. Therefore, the temperature tracking property of the temperature sensor 50 with respect to the coil 40 can be further improved.

[0068] In addition, according to Figure 6 and Figure 7 The structure shown can effectively release the heat of the coil 40 to the outside through the resin mold 60. Examples of heat dissipation paths include a heat dissipation path from the coil 40 to the stator core 20 through the resin mold 60 and a heat dissipation path from the coil 40 to the housing 14 through the resin mold 60.

[0069] In addition, the thermal conductivity of the resin molded portion 60 may be set to be equal to or greater than the thermal conductivity of the bobbin 30. This facilitates heat conduction from the coil 40 to the filling portion 63. Therefore, the temperature of the filling portion 63 surrounding the temperature sensor 50 is close to the temperature of the coil 40, so that the temperature tracking property of the temperature sensor 50 with respect to the coil 40 can be further improved.

[0070] The rotating electrical machine 10 may also be an axial gap type electrical machine in which the rotor 12 and the stator 11 are axially opposed to each other. Figure 8 An example of a stator 11 in an axial gap motor is shown. Figure 8 In the figure, for the convenience of explanation, only one of the plurality of pole teeth 71 is shown.

[0071] like Figure 8 As shown, the stator 11 of the axial gap motor includes a stator core 70 having a plurality of pole teeth 71 extending in the axial direction of the stator 11. The pole teeth 71 have radially outer end faces 72 and circumferential end faces 73. The circumferential end faces 73 are provided at the ends of the pole teeth 71 on one circumferential side and the ends on the other circumferential side.

[0072] The stator 11 includes a bobbin 80 covering the pole teeth 71. The bobbin 80 includes a third covering portion 81 covering the radially outer end surface 72 of the pole teeth 71 and a fourth covering portion 82 covering each circumferential end surface 73 of the pole teeth 71. The bobbin 80 is annularly shaped surrounding the pole teeth 71 when viewed from the axial direction of the stator 11.

[0073] The coil 40 is wound on the outer surfaces of the third covering portion 81 and the fourth covering portion 82 of the bobbin 80. The coil 40 is in a ring shape surrounding the pole teeth 71 and the bobbin 80 when viewed from the axial direction of the stator 11. The third covering portion 81 and the fourth covering portion 82 of the bobbin 80 are sandwiched between the coil 40 and the pole teeth 71. The inner circumferential surface 41 of the coil 40 is in contact with the third covering portion 81 and the fourth covering portion 82 of the bobbin 30.

[0074] The bobbin 30 has a groove 83 at a position opposite to the inner circumferential surface 41 of the coil 40. The groove 83 is provided, for example, at the radially outer end of the bobbin 30, that is, the third covering portion 81. The groove 83 is opposite to the coil end portion 43 of the coil 40 in the radial direction of the stator 11. The coil end portion 43 is the radially outer end of the coil 40 and is provided along the third covering portion 81 in the coil 40.

[0075] The groove portion 83 is formed on the surface of the third covering portion 81 in a manner extending in the axial direction. The groove portion 83 is provided at the circumferential center portion of the third covering portion 81. That is, the groove portion 83 is provided at the same position as the center portion of the pole tooth 71 in the circumferential direction of the stator 11. The groove portion 83 has an opening portion 84 that opens toward the coil 40. The opening portion 84 opens toward the radially outer side. The opening portion 84 is closed by the inner circumferential surface 41 of the coil end portion 43.

[0076] The temperature sensor 50 is arranged in the groove portion 83. The temperature sensor 50 of this example is, for example, in the shape of a rectangular parallelepiped. The temperature sensor 50 is located on the inner peripheral side of the coil 40. The temperature sensor 50 is, for example, in contact with the inner peripheral surface 41 of the coil end portion 43. The temperature sensor 50 is fixed, for example, by being pressed between the inner peripheral surface 41 and the groove portion 83 or by being bonded with an adhesive.

[0077] like Fig. 9 As shown, the groove portion 83 has a positioning portion 85 for positioning the temperature sensor 50 in the axial direction of the stator 11. The positioning portion 85 is an end portion of the groove portion 34 in the axial direction of the stator 11. One end portion of the temperature sensor 50 in the axial direction of the stator 11 abuts against the positioning portion 85. Thus, the movement of the temperature sensor 50 in the axial direction is restricted by the positioning portion 85.

[0078] According to the above configuration, the temperature sensor 50 disposed in the groove 83 is located on the inner circumference side of the coil 40, so that the temperature sensor 50 can appropriately receive the heat flux generated on the inner circumference side of the coil 40 from the coil 40. Therefore, the temperature tracking performance of the temperature sensor 50 with respect to the coil 40 can be improved.

[0079] The structure of the positioning portion 36 of the winding frame 30 is not limited to the above-mentioned embodiment, and can be, for example, Fig.10 Change like that.

[0080] like Fig.10 As shown, the groove portion 34 has a positioning portion 91, and the positioning portion 91 positions the temperature sensor 50 in the radial direction of the stator 11. The positioning portion 91 protrudes axially from the inner surface of the groove portion 34, for example. The positioning portion 91 is provided on the radially outer side of the temperature sensor 50. Moreover, the outer end of the temperature sensor 50 in the radial direction of the stator 11 abuts against the positioning portion 91. Thus, the movement of the temperature sensor 50 toward the radial outside is restricted by the positioning portion 91. Therefore, even when a tensile force toward the radial outside is applied to the lead wire 51 during installation of the lead wire 51, the positioning portion 91 makes it difficult for the temperature sensor 50 to come out of the groove portion 34.

[0081] In addition, for example, a pair of positioning portions 91 are provided on both sides in the circumferential direction of the lead wire 51. The lead wire 51 passes between the pair of positioning portions 91. Thus, the pair of positioning portions 91 can be used to position the lead wire 51 in the circumferential direction of the stator 11.

[0082] The configuration of the temperature sensor 50 , such as the shape, is not limited to the above-described embodiment, and can be appropriately changed according to the configuration of the rotating electrical machine 10 .

[0083] In the above-described embodiment, the temperature sensor 50 may be provided away from the inner peripheral surface 41 of the coil 40 .

[0084] In the circumferential direction of the stator 11 , the dimension D1 of the groove portion 34 and the dimension D2 of the temperature sensor 50 may be the same.

[0085] The groove portion 83 may be provided at a position offset from the center portion C1 of the pole tooth 23 in the circumferential direction.

[0086] The center C2 of the temperature sensor 50 may coincide with the center C3 of the coil 40 in the radial direction of the stator 11. The center C2 of the temperature sensor 50 may be located radially outward relative to the center C3 of the coil 40 in the radial direction of the stator 11.

[0087] In the above-described embodiment, the temperature sensor 50 may be fixed to the groove portion 83 by using an adhesive instead of being fixed by press-fitting.

[0088] In the above embodiment, the guide portions 33 are provided at both ends of the first covering portion 31 in the circumferential direction. Alternatively, for example, the guide portion 33 may be formed only at one end of the first covering portion 31 in the circumferential direction.

[0089] The bobbin 30 of the above-described embodiment is molded with respect to the stator core 20 , but the present invention is not limited thereto. For example, a structure in which a separately manufactured bobbin is attached to the stator core 20 may be adopted.

[0090] The numbers of the pole teeth 23 and the coils 40 are not limited to those in the above-described embodiment, and can be appropriately changed according to the structure.

[0091] The stator core 20 is not limited to a structure formed of a plurality of split cores 21 , and may be formed of an integral member.

[0092] The rotating electrical machine 10 of the above embodiment is an inner rotor type rotating electrical machine in which the rotor 12 is arranged on the inner circumference side of the stator 11 , but it can also be applied to an outer rotor type rotating electrical machine in which the rotor is arranged on the outer circumference side of the stator.

[0093] The present invention is described based on the embodiments. However, it should be understood that the present invention is not limited to the embodiments or structures. The present invention also includes various modifications and variations within the equivalent range. In addition, various combinations, modes, and other combinations and modes that make them include only one element, more than one or less than one element are also included in the scope and thought range of the present invention.

[0094] (Note)

[0095] The features of the present invention are as follows.

[0096] [1] A stator (11) comprises: a stator core (20, 70), the stator core having pole teeth (23, 71); a winding frame (30, 80), the winding frame covering the pole teeth; a coil (40), the coil wound on the winding frame; and a temperature sensor (50), the temperature sensor detecting the temperature of the coil, wherein the coil has an inner peripheral surface (41) in contact with the winding frame, the winding frame has a groove (34, 83) at a position opposite to the inner peripheral surface of the coil, the temperature sensor is arranged in the groove, and the temperature sensor is located on the inner peripheral side of the coil.

[0097] [2] The stator described in [1] above, wherein the slot has an opening (35, 84) opening toward the coil, the opening is closed by the inner circumferential surface of the coil, and the temperature sensor is in contact with the inner circumferential surface of the coil.

[0098] [3] The stator described in [1] or [2] above, wherein the temperature sensor is fixed by being pressed into between the inner peripheral surface of the coil and the groove portion.

[0099] [4] The stator described in any one of [1] to [3] above, wherein the groove portion is provided at the same position as the center portion (C1) of the pole tooth in the circumferential direction of the stator.

[0100] [5] A stator as described in any one of [1] to [4] above, wherein the pole teeth extend along the radial direction of the stator, and in the radial direction of the stator, the center portion (C2) of the temperature sensor is located on the inner diameter side compared to the center portion (C3) of the coil.

[0101] [6] The stator described in any one of [1] to [5] above, wherein the groove portion has a positioning portion (36, 85, 91) that positions the temperature sensor.

[0102] [7] The stator described in any one of [1] to [6] above, wherein the size (D1) of the groove portion in the circumferential direction of the stator is larger than the size (D2) of the temperature sensor.

[0103] [8] The stator described in any one of [1] to [7] above, wherein the temperature sensor is fixed to the groove portion by an adhesive (G).

[0104] [9] A stator as described in any one of the above [1] to [8], wherein the stator comprises a resin molded portion (60) which covers the coil, the resin molded portion having a filling portion (63) which enters the groove portion, the filling portion being in close contact with the inner circumferential surface of the coil, the surface of the temperature sensor and the inner surface of the groove portion.

[0105]

[10] The stator described in the above [9], wherein the thermal conductivity of the bobbin is greater than the thermal conductivity of the resin molded portion.

[0106]

[11] A rotating electric machine (10) comprises a stator (11) and a rotor (12) opposite to the stator, wherein the stator comprises: a stator core (20, 70) having pole teeth (23, 71); a winding frame (30, 80) covering the pole teeth; a coil (40) wound on the winding frame; and a temperature sensor (50) detecting the temperature of the coil, wherein the coil has an inner peripheral surface (41) in contact with the winding frame, the winding frame has a groove (34, 83) at a position opposite to the inner peripheral surface of the coil, the temperature sensor is arranged in the groove, and the temperature sensor is located on the inner peripheral side of the coil.

Claims

1. A stator (11), comprising: A stator core (20, 70) having pole teeth (23, 71); A winding frame (30, 80), the winding frame covering the pole teeth; a coil (40) wound on the winding frame; and a temperature sensor (50) for detecting the temperature of the coil, It is characterized in that The coil has an inner peripheral surface (41) in contact with the winding frame, The bobbin has a groove (34, 83) at a position opposite to the inner peripheral surface of the coil. The temperature sensor is arranged in the groove. The temperature sensor is located on the inner circumference side of the coil.

2. The stator according to claim 1, characterized in that: The groove portion has an opening portion (35, 84) opening toward the coil, The opening is closed by the inner peripheral surface of the coil, The temperature sensor is in contact with the inner peripheral surface of the coil.

3. The stator according to claim 2, characterized in that: The temperature sensor is fixed by being press-fitted between the inner peripheral surface of the coil and the groove portion.

4. The stator according to claim 1, characterized in that: The groove portion is provided at the same position as the center portion (C1) of the pole tooth in the circumferential direction of the stator.

5. The stator according to claim 1, characterized in that: The pole teeth extend along the radial direction of the stator, In the radial direction of the stator, a center portion (C2) of the temperature sensor is located on the inner diameter side relative to a center portion (C3) of the coil.

6. The stator according to claim 1, characterized in that: The groove portion has a positioning portion (36, 85, 91) which positions the temperature sensor.

7. The stator according to claim 1, characterized in that: In the circumferential direction of the stator, a size (D1) of the groove portion is larger than a size (D2) of the temperature sensor.

8. The stator according to claim 1, characterized in that: The temperature sensor is fixed to the groove portion by an adhesive (G).

9. The stator according to claim 1, characterized in that: A resin molded portion (60) is provided, the resin molded portion covering the coil, The resin molded portion has a filling portion (63) that enters the groove portion. The filling portion is in close contact with the inner peripheral surface of the coil, the surface of the temperature sensor, and the inner surface of the groove.

10. The stator according to claim 9, characterized in that The bobbin has a thermal conductivity greater than that of the resin mold portion.

11. A rotating electrical machine (10), comprising a stator (11) and a rotor (12) facing the stator, characterized in that: The stator has: A stator core (20, 70) having pole teeth (23, 71); A winding frame (30, 80), the winding frame covering the pole teeth; A coil (40) wound on the winding frame; as well as a temperature sensor (50) for detecting the temperature of the coil, The coil has an inner peripheral surface (41) in contact with the winding frame, The bobbin has a groove (34, 83) at a position opposite to the inner peripheral surface of the coil. The temperature sensor is arranged in the groove. The temperature sensor is located on the inner circumference side of the coil.

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