Insulator, stator and electric motor

Abstract

The present application provides an insulator capable of improving the insulation characteristics of a stator. The insulator is composed of a first insulator (200A) and a second insulator (200B). The first insulator (200A) has a first flange portion (210), a second flange portion (220), and a stem portion (230). The second insulator (200B) has a first flange portion (210), a second flange portion (400), and a stem portion (230). The second flange portion (220) of the first insulator (200A) has an overlapping portion (220E) and an overlapping portion (220F) on a circumferential one side and a circumferential other side. The second flange portion (400) of the second insulator (200B) has an overlapping portion (400E) and an overlapping portion (400F) on a circumferential one side and a circumferential other side. The first insulator (200A) and the second insulator (200B) are alternately installed to a plurality of teeth (121). At this time, the overlapping portion (220E) and the overlapping portion (400F) overlap in the circumferential and axial directions, and the overlapping portion (220F) and the overlapping portion (400E) overlap in the circumferential and axial directions.

Description

Technical Field

[0001] The present invention relates to an insulator for teeth mounted on a stator core, a stator having an insulator for teeth mounted on a stator core, and an electric motor. Background Technology

[0002] Various electric motors with stators and rotors are used as compressor drive motors, vehicle drive motors, and on-board equipment drive motors. In particular, a type of electric motor in which the stator windings are wound in a concentrated winding manner around the teeth of the stator core that constitutes the stator is used (called a "concentrated winding motor"). In a concentrated winding motor, the stator windings are wound around the teeth through an insulator (called a "resin winding tube").

[0003] Furthermore, in such concentrated winding motors, in order to increase the number of turns in the stator winding (i.e., to increase the slot fill factor of the stator winding within the slots), motors with stator cores having a segmented structure have been proposed. The segmented stator core consists of multiple segmented cores formed by dividing the stator core.

[0004] For example, patent documents 1 to 3 disclose electric motors using stator cores with a segmented structure.

[0005] In the electric motor disclosed in Patent Document 1, the stator core is divided into multiple chips connected at equal intervals in the circumferential direction. The multiple chips have a back yoke and teeth extending inward from the back yoke.

[0006] An insulator is attached to the back magnetic yoke and tooth assembly of the stator core. The stator windings are wound around the insulator. The insulator is as described in Patent Document 1. Figure 5 As shown, pin insertion holes are provided at both ends. Furthermore, adjacent insulators are connected by inserting connecting pins into the two pin insertion holes while the pin insertion holes of adjacent insulators are overlapping.

[0007] In the electric motor disclosed in Patent Document 2, such as Patent Document 2... Figure 1 As shown, the stator core is divided into multiple teeth arranged radially and a ring-shaped magnetic yoke.

[0008] An insulator with a coil wound around it is mounted on each tooth. Furthermore, the radially outer end of each tooth is fitted into the radially inner side of the yoke, thereby forming the stator core.

[0009] In the electric motor disclosed in Patent Document 3, such as Patent Document 3... Figure 2 As shown, the stator core is divided into a ring-shaped stator core body and a tooth connector with multiple teeth connected together.

[0010] A polygonal hole is formed in the center of the stator core body. In addition, an insertion groove is formed in the center of each side face of the hole.

[0011] The stator windings are wound around each tooth through an insulator.

[0012] Furthermore, the radially outer ends of each tooth are pressed into the insertion slots of the stator core body. Thus, the stator core body and the tooth connection body with the stator winding wound on each tooth are assembled into one unit.

[0013] For example, in patent document 3 Figure 5 As shown, stator windings with different phases (U phase, V phase, W phase) are wound around adjacent teeth. Therefore, insulation is required between adjacent stator windings and between the stator windings and the stator core.

[0014] Therefore, in the electric motor disclosed in Patent Document 3, such as in Patent Document 3... Figure 6 As shown, the radially outer end of the insulator is cut at an angle. This creates a gap between the cut surface and the inner surface of the stator core body. Then, the central portion of the winding insulation member (called the "phase-to-phase insulation member"), which is formed by bending into a T-shape, is inserted between adjacent stator windings, with the end inserted into the gap between the cut surface and the inner surface of the stator core body.

[0015] Existing technical documents

[0016] Patent documents

[0017] Patent Document 1: International Publication No. 2017 / 175358

[0018] Patent Document 2: Japanese Patent Application Publication No. 63-299734

[0019] Patent Document 3: Japanese Patent Application Publication No. 2002-171704 Summary of the Invention

[0020] The problem the invention aims to solve

[0021] In the stator disclosed in Patent Document 1, the tooth tips formed on the radially inner side of the teeth abut against the radially inner side surface of the insulator. That is, the surface distance between the stator winding wound around the insulator and the tooth tips is relatively short. Therefore, when the stator disclosed in Patent Document 1 is used in a high-voltage motor, partial discharge may occur between the stator winding and the tooth tips. In addition, the number of components increases because connecting pins are required to connect adjacent insulators.

[0022] In the stators disclosed in Patent Documents 2 and 3, the insulators mounted on the teeth form gaps between adjacent insulators on the radially inner side. That is, the surface distance between the stator winding wound around the insulator and the tooth tip is relatively short. Therefore, similar to the stator disclosed in Patent Document 1, partial discharge may occur between the stator winding and the tooth tip.

[0023] The present invention was made in view of the fact that its object is to provide an insulator capable of improving the insulation performance between the stator winding and the tooth tip.

[0024] Solution for solving the problem

[0025] The first technical solution relates to an insulator with multiple teeth mounted on a stator. The multiple teeth are arranged circumferentially and extend radially and axially.

[0026] The first technical solution has a first flange, a second flange, and a main body.

[0027] The first flange extends circumferentially and axially. The second flange is positioned radially inward of the first flange and extends circumferentially and axially. The main body extends radially, connecting the first and second flanges, and has a through hole formed on its inner side for tooth insertion.

[0028] In the second flange portion, overlapping portions extending in the axial and circumferential directions are formed at positions on the circumferential side of the through hole and on the circumferential side of the through hole, respectively.

[0029] Furthermore, the configuration is such that, with the insulators respectively mounted on multiple teeth, two adjacent overlapping portions in the circumferential direction overlap in the radial direction.

[0030] In the first technical solution, the space between adjacent insulators in the circumferential direction can be blocked. This improves the insulation performance between the stator winding wound around the insulator and the tooth tip.

[0031] In different embodiments of the first technical solution, the insulator includes a first insulator and a second insulator. Both the first insulator and the second insulator have a first flange, a second flange, and a main body.

[0032] In addition, in the second flange portion of the first insulator and the second flange portion of the second insulator, overlapping portions are formed at positions on the circumferential side of the through hole and on the circumferential side of the through hole.

[0033] The first and second insulators are alternately installed on multiple teeth.

[0034] Furthermore, the configuration is such that, with the first insulator and the second insulator alternately installed on multiple teeth, adjacent overlapping portions in the circumferential direction overlap in the radial direction.

[0035] In this method, the insulation performance between the stator winding wound on the insulator and the tooth tip can be improved.

[0036] In different embodiments of the first technical solution, one of the two overlapping portions in the radial direction forms an abutment portion that restricts the position of the other overlapping portion.

[0037] In the case where another overlapping portion overlaps another overlapping portion from one circumferential side, the abutting portion of one overlapping portion is composed of a first abutting portion that can abut against the side of the other overlapping portion from the other circumferential side and a second abutting portion that can abut against the end wall of the other overlapping portion from the other axial side.

[0038] In addition, when another overlapping portion overlaps another overlapping portion from the other side of the circumference, the overlapping portion is composed of a first abutting portion that can abut against the side of the other overlapping portion on the circumferential side and a second abutting portion that can abut against the end wall of the other overlapping portion on the axial side.

[0039] In this method, two adjacent overlapping parts can be accurately overlapped.

[0040] In different embodiments of the first technical solution, one of the two overlapping portions in the radial direction is formed with an abutment portion that restricts the position of one of the overlapping portions.

[0041] In a configuration where another overlapping portion overlaps another overlapping portion from one circumferential side, the abutting portion of the other overlapping portion can be abutted by the side of the other overlapping portion from the other circumferential side.

[0042] Furthermore, in the case where another overlapping portion overlaps another overlapping portion from the circumferential direction on the other side, the other overlapping portion can be abutted against the side of the circumferential side of one overlapping portion.

[0043] In this method, it is possible to more accurately overlap two adjacent overlapping parts.

[0044] In different embodiments of the first technical solution, each overlapping portion has an overlapping surface extending circumferentially and axially.

[0045] Two adjacent overlapping portions overlap in such a way that the overlapping surface of one overlapping portion is positioned radially outward from the overlapping surface of the other overlapping portion.

[0046] Another overlapping portion has a recess-forming surface that forms a recess at a position radially outward from the abutting portion formed in the other overlapping portion.

[0047] One overlapping portion has a remaining partial recess-forming surface that forms a recess, located radially outward from the side of the abutting portion that abuts against another overlapping portion.

[0048] In this method, movement of the winding insulation member inserted between the stator windings wound around the insulator can be prevented.

[0049] In different embodiments of the first technical solution, each overlapping portion has an overlapping surface extending circumferentially and axially.

[0050] Furthermore, the two overlapping portions are configured such that, in a state where their respective overlapping surfaces overlap face to face, the opening angle of the adjacent insulators in the circumferential direction is an angle corresponding to the opening angle of the adjacent teeth in the circumferential direction.

[0051] This method can prevent a decrease in the installability of the insulator.

[0052] In different embodiments of the first technical solution, each overlapping portion has an overlapping surface extending circumferentially and axially.

[0053] Furthermore, the two overlapping portions overlap in such a way that the overlapping surface of the overlapping portion of the first insulator is positioned radially outward than the overlapping surface of the overlapping portion of the second insulator.

[0054] In this method, the first insulator and the second insulator can be easily mounted on multiple teeth.

[0055] The second technical solution involves a stator having a stator core, multiple insulators, and stator windings.

[0056] The stator core has a circumferentially extending yoke and a plurality of teeth arranged circumferentially apart and extending radially inward from the yoke. A plurality of insulators are respectively mounted on the plurality of teeth. The stator winding is wound on the insulators mounted on the teeth. Furthermore, any of the aforementioned insulators is used as the insulator.

[0057] This technical solution has the same effect as the insulators described above.

[0058] In different embodiments of the second technical solution, a winding insulation component is also included.

[0059] The winding insulation member has a central portion extending axially and radially, and a pair of ends that bend away from each other at both circumferential ends of the central portion and extend axially and circumferentially.

[0060] The first flange of the insulator has an outer peripheral surface on its radially outer side. On the outer peripheral surface of the first flange, a first recess is formed at a position circumferentially closer to the through hole, and a second recess is formed at a position circumferentially closer to the through hole. The first recess is open on its circumferential side, its axial side, and its radially outer side. The second recess is also open on its circumferential side, its axial side, and its radially outer side.

[0061] Furthermore, the central portion of the winding insulation member is positioned between adjacent insulators in the circumferential direction. Additionally, one and the other of a pair of ends of the winding insulation member are respectively positioned in the first recess of one insulator and the second recess of the other adjacent insulator in the circumferential direction.

[0062] In this method, the circumferential and axial positions of the winding insulation member inserted between the stator windings wound on the insulator can be restricted.

[0063] In different embodiments of the second technical solution, the first flange has side surfaces on one circumferential side and the other circumferential side. At least one of the side surfaces on one circumferential side and the other circumferential side has a protrusion formed at a position on the opposite side of the axial direction. The protrusion formed on the side surface on one circumferential side protrudes from the side surface on one circumferential side toward the circumferential side. The protrusion formed on the side surface on the other circumferential side protrudes from the side surface on the other circumferential side toward the other circumferential side.

[0064] Furthermore, the movement of the winding insulation member to the other axial side is restricted by a protrusion formed by at least one of the circumferential side surface and the circumferential side surface of the first flange portion.

[0065] In this method, movement of the winding insulation member inserted between the stator windings wound around the insulator can be prevented.

[0066] In different embodiments of the second technical solution, the stator core is composed of a first core member having a magnetic yoke and a second core member having multiple teeth.

[0067] This method can increase the number of turns in the stator winding.

[0068] The third technical solution relates to an electric motor having a stator and a rotor configured to rotate relative to the stator. Furthermore, any of the aforementioned stators is used as the stator.

[0069] This technical solution has the same effect as the insulators described above.

[0070] By using the insulator of the present invention, the insulation characteristics of the stator or motor can be improved. Attached Figure Description

[0071] Figure 1 This is a perspective view of one embodiment of the stator of the present invention.

[0072] Figure 2 It is Figure 1 The diagram is an enlarged version of the portion indicated by arrow II.

[0073] Figure 3 This is a diagram showing a simplified structure of the stator core that constitutes one embodiment of the stator.

[0074] Figure 4 This is a perspective view of the first insulator constituting one embodiment of the stator.

[0075] Figure 5 Observing from the direction of arrow V Figure 4 The resulting image.

[0076] Figure 6 Observing from the direction of arrow VI Figure 4 The resulting image.

[0077] Figure 7 Observing from the direction of arrow VII Figure 4 The resulting image.

[0078] Figure 8 Observing from the direction of arrow VIII-VIII Figure 4 The resulting sectional view.

[0079] Figure 9 It is Figure 8 The image is an enlarged version of the portion indicated by arrow IX.

[0080] Figure 10 It is Figure 8 The image is an enlarged version of the portion indicated by arrow X.

[0081] Figure 11 This diagram illustrates the action of installing the first insulator onto the tooth.

[0082] Figure 12 This is a perspective view of the second insulator constituting one embodiment of the stator.

[0083] Figure 13 Observing from the direction of arrow XIII Figure 12 The resulting image.

[0084] Figure 14 Viewed from the direction of arrow XIV Figure 12 The resulting image.

[0085] Figure 15 Observing from the XV direction Figure 12 The resulting image.

[0086] Figure 16 Observe from arrow ⅩⅥ-ⅩⅥ Figure 12 The resulting sectional view.

[0087] Figure 17 It is Figure 16 The image is an enlarged version of the portion indicated by arrows X and VII.

[0088] Figure 18 It is Figure 16 The image is an enlarged version of the portion indicated by arrows X and VIII.

[0089] Figure 19 This is a three-dimensional diagram illustrating the action of installing the second insulator onto the tooth.

[0090] Figure 20This diagram illustrates the operation of installing the first insulator and the second insulator onto the first core component of the stator core.

[0091] Figure 21 This is a diagram showing the state of the first core component with the first and second insulators installed on the stator core.

[0092] Figure 22 This diagram illustrates the operation of arranging the first insulator and the second insulator adjacent to each other.

[0093] Figure 23 This is a three-dimensional view obtained by observing the state of the first insulator and the second insulator arranged adjacent to each other from the radial inside.

[0094] Figure 24 This is a diagram showing the overlapping state of the overlapping portion of the first insulator and the overlapping portion of the second insulator.

[0095] Figure 25 This is a diagram showing the overlapping state of the overlapping portion of the first insulator and the overlapping portion of the second insulator.

[0096] Figure 26 This diagram illustrates the operation of inserting the winding insulation member that constitutes the stator of the first embodiment.

[0097] Figure 27 This diagram illustrates the action of inserting the winding insulation component.

[0098] Figure 28 This is a diagram showing the state in which a winding insulating component is inserted.

[0099] Explanation of reference numerals in the attached figures

[0100] 100. Stator; 110. Stator core; 110A, 110B. Core end face; 120. First core member; 121. Tooth; 122. Tooth base; 123. Tooth tip; 124. Tooth tip face; 125. Connecting part; 126, 136. Insertion protrusion; 130. Second core member; 131. Yoke; 132. Outer peripheral surface of yoke; 133. Inner peripheral surface of yoke; 133a, 133b. Inner peripheral surface portion of yoke; 134a. Recessed forming surface; 200, 200A, 200B. Insulator; 210. First flange; 210A, 220A, 400A. Outer peripheral surface; 210B, 220B, 400B. Inner peripheral surface; 211, 2 12, 221A, 211B1, 211C1, 220B1, 221B1, 221C1, 222, 227, 401, 402, 405A, 451, 452, end faces; 213, 214, 223, 221B, 221C, 224, 281b, 291b, 403, 404, side faces; 220, 400, second flange portion; 200Ap, 200Bp, circumferential center lines; 220B2, 220B21, 220B22, 220B3, 220B31, 220B32, 400B21, 400B22, 400B31, 400B32, inner circumferential surface portions; 220B23~ 220B25, 220B33~220B35, 400B2, 400B23~400B26, 400B3, 400B33~400B36, outer peripheral surface; 220E, 220F, 400E, 400F, overlapping portion; 211B, 211C, 213A, 214A, 221, 221B, 221C, 226B, 226C, 250, 260, 270, 277, 278, 405, 407B, 407C, protrusion; 213a, 214a, locking surface; 122a~122d, 221A1, 221A2, 225, 251, 252, 261~264, 27 1-274, outer wall surface; 226A, 407A, protruding piece; 240, through hole; 241-244, inner wall surface; 241a-244a, inclined surface; 264a, 274a, 264b-264d, 274b, outer wall surface portion; 265, 275, space; 277, locking protrusion; 280, 290, N1, N2, recess; 281a, 291a, bottom surface; 310, winding insulation component (phase-to-phase insulation component); 310a-310d, edge; 310A, 310D, end; 310B, 310C, central portion; 311A-311C, bending line; 610, stator winding; P, rotation center line. Detailed Implementation

[0101] The following detailed description is only intended to show, to those skilled in the art, details of preferred applications for carrying out the invention. The scope of the invention is not limited to the detailed description, but is defined based on the claims. Therefore, the combinations of structures and methods described in the following detailed description are not all necessary for carrying out the invention in a broad sense; the detailed description, along with the reference numerals in the accompanying drawings, only discloses representative embodiments of the invention.

[0102] The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0103] In this specification, the term "axial" refers to the rotor's rotation center line P (refer to) when the rotor is configured to rotate relative to the stator. Figure 1 The direction of extension of ).

[0104] The term "circumferential direction" refers to the circumferential direction centered on the rotation centerline P when viewed in a cross section perpendicular to the axial direction, in a state where the rotor is configured to rotate relative to the stator.

[0105] The term "radial" indicates the direction along the rotation center line P when viewed in a cross-section perpendicular to the axial direction, with the rotor configured to rotate relative to the stator. The term "radial inner side" indicates the radial side closest to the rotation center line P, while the term "radial outer side" indicates the radial side opposite to the rotation center line P.

[0106] Furthermore, for insulators, terms such as "axial," "circumferential," and "radial" refer to the "axial," "circumferential," and "radial" states of the insulator being mounted on the teeth of the stator core.

[0107] In addition, in this specification, terms such as "parallel," "right angle," and "flat" are used to mean "approximately parallel," "approximately right angle," and "approximately flat," respectively.

[0108] Additionally, for convenience, in this instruction manual, Figure 1 , Figure 5 , Figure 13 In this explanation, the upper side is referred to as "one side of the axial direction," and the lower side as "the other side of the axial direction." Furthermore, when viewed from one side of the axial direction, the counterclockwise direction around the rotation center line P (in...) Figure 5 , Figure 13 The right side (center) is taken as the "circumferential side", and the clockwise direction around the rotation center line P (in) Figure 5 , Figure 13 The middle section (left side) is used to explain "the other side of the circumference".

[0109] Of course, the "one side" and "the other side" in each direction can also be reversed.

[0110] Reference Figures 1 to 25 This invention describes one embodiment of the stator of the present invention.

[0111] exist Figure 1 A perspective view of a stator 100 according to one embodiment is shown. Additionally, in Figure 2 The middle shows Figure 1 An enlarged view of the portion indicated by arrow II. Furthermore, in Figure 1 The image shows the conductor side of the stator 100. "Conductor side of the stator" means the side where the conductors connected to the power supply are pulled out.

[0112] The stator 100 is composed of a stator core 110, an insulator 200, a stator winding 610, and a winding insulation component 310.

[0113] The stator core 110 has a core end face 110A on one axial side and a core end face 110B on the other axial side.

[0114] Furthermore, the stator core 110 is configured as a segmented stator core. In this embodiment, as... Figure 3 As shown, the stator core 110 is composed of a first core member 120 and a second core member 130.

[0115] The first core member 120 (referred to as the "inner core") is composed of a laminate formed by stacking multiple electromagnetic steel plates using insert protrusions 126. The first core member 120 has a plurality of teeth 121 extending radially and arranged circumferentially. Each tooth 121 has a tooth base 122 extending radially and a tooth tip 123 located radially inside the tooth base 122 and extending circumferentially. The tooth tips 123 of adjacent teeth 121 in the circumferential direction are connected by a connecting portion 125.

[0116] The second core member 130 (referred to as the "outer core") is a laminate formed by stacking multiple electromagnetic steel plates using insert protrusions 136. The second core member 130 has a yoke 131 extending circumferentially and an inner circumferential surface 133 of the yoke.

[0117] The yoke 131 has an outer circumferential surface 132 and an inner circumferential surface 133. Additionally, the yoke 131 has a recess forming surface 134a that is recessed radially outward from the inner circumferential surface 133. A recess 134 is formed on the recess forming surface 134a to engage with the radially outer end of the tooth 121 (specifically, tooth base 122) of the first core member 120. Furthermore, the inner circumferential surface 133 has inner circumferential surface portions 133a and 133b formed between two adjacent recesses 134 (recess forming surfaces 134a) in the circumferential direction.

[0118] The inner circumferential surfaces 133a and 133b of the magnetic yoke are inclined such that the radial width of the magnetic yoke 131 decreases from the connection between the inner circumferential surface 133a and the recess 134 and the connection between the inner circumferential surface 133b and the recess 134 towards the circumferential center between the two recesses 134.

[0119] The stator core 110 is formed by inserting the radially outer end (opposite to the tooth tip 123) of the tooth base 122 of the first core member 120 into the recess 134 of the second core member 130. For example, the radially outer end of the tooth base 122 is pressed into the recess 134, thermofitted, or cold-shrink fitted. That is, a stator core 110 is formed having a yoke 131, a plurality of teeth 121, and a plurality of connecting portions 125. The yoke 131 extends circumferentially, and the plurality of teeth 121 extend radially inward from the yoke 131. Each tooth 121 has a tooth base 122 extending radially inward from the yoke 131 and a tooth tip 123 extending circumferentially to both sides from the radially inward end of the tooth base 122. Adjacent tooth tips 123 are connected by connecting portions 125 extending circumferentially. Furthermore, a groove is formed between the yoke 131 and two adjacent teeth 121.

[0120] Furthermore, a tooth tip surface 124 is formed on the radial side of the tooth tip portion 123. The rotor insertion space is formed by the tooth tip surface 124.

[0121] The electric motor of the present invention consists of a stator 100 and a rotor (not shown) that is rotatably inserted into a rotor insertion space. Various known rotor structures can be used as the rotor.

[0122] Stator winding 610 (reference) Figure 1 , Figure 2 The stator winding 610 is wound around the insulator 200 mounted on the tooth 121. That is, the stator winding 610 is wound around the tooth 121 in a concentrated winding manner. Various methods can be used to wind the stator winding 610 around the tooth 121. For example, a method can be used where the stator winding 610 is wound around the insulator 200 while it is mounted on the tooth 121. Alternatively, a method can be used where the insulator 200 is wound around the stator winding 610 on the insulator 200 while it is mounted on the tooth 121.

[0123] Next, the insulator will be described. In this embodiment, the insulator 200 has a first insulator 200A and a second insulator 200B.

[0124] First, refer to Figures 4 to 10 The first insulator is rated at 200A. Figure 4 This is a three-dimensional view of the first insulator, 200A. Figure 5 Viewed from the direction of arrow V (radial outwards). Figure 4The resulting image. Figure 6 Viewed from the direction of arrow VI (radial inwards). Figure 4 The resulting image. Figure 7 Viewed from the direction of arrow VII (circumferential side). Figure 4 The resulting image. Figure 8 Observing from the direction of arrow VIII-VIII Figure 4 The resulting sectional view. Figure 9 , Figure 10 They are respectively Figure 8 Enlarged view of the parts indicated by arrows IX and X.

[0125] The first insulator 200A is formed from a resin with insulating properties, such as polybutylene terephthalate (PBT) resin, polyphenylene sulfide (PPS) resin, liquid crystal polymer (LCP) resin, nylon, etc.

[0126] The first insulator 200A has a first flange portion 210, a second flange portion 220, and a main body 230.

[0127] The first flange portion 210 extends along both the axial and circumferential directions. Additionally, the first flange portion 210 is located radially outward (in... Figure 5 The paper surface has an outer peripheral surface 210A, and on the radially inner side (in the middle). Figure 5 The inner circumferential surface 210B is located on the inner side of the paper (in the middle), and on one axial side (in the middle). Figure 5 The upper side (in the middle) has an end face 211, and on the other side (in the axial direction) Figure 5 The lower side (middle) has an end face 212, on one circumferential side (in Figure 5 The middle (right side) has a side 213, on the other side in the circumferential direction (in Figure 5 The middle section is on the left side and has a side panel of 214.

[0128] The second flange portion 220 is positioned radially inward compared to the first flange portion 210, and extends along both the axial and circumferential directions. Furthermore, the second flange portion 220 has an outer circumferential surface 220A on its radially outer side, an inner circumferential surface 220B on its radially inner side, an end face 227 on one axial side, an end face 222 on the other axial side, a side surface 223 on one circumferential side, and a side surface 224 on the other circumferential side.

[0129] The main body 230 is disposed between the first flange portion 210 and the second flange portion 220 and extends radially. In addition, the main body 230 has a through hole 240 that opens into the outer peripheral surface 210A of the first flange portion 210 and the inner peripheral surface 220B of the second flange portion 220.

[0130] The through hole 240 is formed by inner wall surfaces 241 to 244. In this embodiment, as... Figure 11As shown, the end of the tooth base 122 is inserted into the through hole 240 from the side of the second flange 220. At this time, the outer wall surfaces 122a, 122b, 122c and 122d of the tooth base 122 are inserted in such a way that they are opposite to the inner wall surfaces 241, 242, 243 and 244 of the through hole 240, respectively.

[0131] In addition, such as Figure 6 As shown, the inner wall surfaces 241, 242, 243, and 244 of the through hole 240 have inclined surfaces 241a, 242a, 243a, and 244a on the inner peripheral surface 220B side of the second flange portion 220. This allows the tooth base 122 to be easily inserted into the through hole 240 of the first insulator 200A while preventing the first insulator 200A from shifting axially and circumferentially relative to the tooth base 122.

[0132] like Figure 4 , Figure 5 As shown, the first flange portion 210 is provided with protrusions 250, 260, and 270 that protrude radially outward from the outer peripheral surface 210A. In this embodiment, the outer peripheral surface 210A is formed as a flat surface extending circumferentially and axially.

[0133] The protrusion 250 is provided on the end face 212 side relative to the through hole 240. The protrusion 250 has an outer wall surface 251 on the end face 212 side and an outer wall surface 252 on the through hole 240 side. The outer wall surface 251 is formed as an inclined surface whose distance from the outer peripheral surface 210A increases as it moves from the end face 212 side toward the through hole 240 side. The outer wall surface 251 of the protrusion 250 is inclined, thereby allowing the end of the tooth base 122 protruding from the through hole 240 (outer peripheral surface 210A) of the first insulator 200A to be easily inserted into the recess 134 of the second core member 130.

[0134] The protrusion 260 is located in the region closer to the end face 211 (axial side) and the side face 213 (circumferential side) than the through hole 240. The protrusion 260 has outer wall surfaces 261 to 264. The outer wall surface 261 is formed on the radially outer side and extends circumferentially and axially. The outer wall surface 262 is formed on the other axial side and extends circumferentially and radially. The outer wall surface 264 is formed on the circumferential side (opposite to the protrusion 270) and extends axially. The outer wall surface 263 is formed on the other circumferential side (opposite to the protrusion 270) and extends axially. Furthermore, the axial outer wall surface of the protrusion 260 is formed by the end face 211 of the first flange portion 210.

[0135] The outer wall surface 264 has a first outer wall surface portion 264a, a second outer wall surface portion 264b, a third outer wall surface portion 264c, a fourth outer wall surface portion 264d, and a fifth outer wall surface portion 264e extending from one axial side toward the other axial side. In this embodiment, outer wall surface portions 264a and 264d extend in a substantially coaxial line parallel to the axial direction. Outer wall surface portion 264b extends at a right angle to the axial direction from the end of outer wall surface portion 264a on the other axial side toward the circumferential side. Outer wall surface portion 264c extends at an oblique angle relative to both the axial and circumferential sides of outer wall surface portion 264d on the axial side. Outer wall surface portion 264e extends at an oblique angle relative to both the axial and circumferential sides of outer wall surface portion 264d on the other axial side.

[0136] The protrusion 270 is located in the region closer to the end face 211 (axial side) and the side face 214 (circumferential side) than the through hole 240. The protrusion 270 has outer wall surfaces 271 to 274. The outer wall surface 271 is formed radially outward and extends circumferentially and axially. The outer wall surface 272 is formed on the other axial side and extends circumferentially and radially. The outer wall surface 273 is formed on one circumferential side (the side opposite to the protrusion 260) and extends axially, and the outer wall surface 274 is formed on the other circumferential side (the side opposite to the protrusion 260) and extends axially. Furthermore, the outer wall surface on the axial side of the protrusion 270 is formed by the end face 211 of the first flange portion 210.

[0137] The outer wall surface 274 extends from one axial side to the other axial side and has a first outer wall surface portion 274a and a second outer wall surface portion 274b. The first outer wall surface portion 274a extends parallel to the axial direction. The second outer wall surface portion 274b extends obliquely to the other circumferential and axial sides from the position of the first outer wall surface portion 274a on the other axial side. The end of the second outer wall surface portion 274b on the other axial side is connected to the outer wall surface 272.

[0138] Additionally, a locking protrusion 277 protruding circumferentially to the other side is provided on the first outer wall portion 274a of the protrusion 270. The locking protrusion 277 has a protrusion 278 protruding axially to the other side at its circumferential end. The locking protrusion 277 is used to fix the end of the stator winding 610. Furthermore, the spaces 265 on the outer wall portion 264b of the outer wall 264 and the outer wall portion 274b of the outer wall 274 are used to ensure working space when fixing the end of the stator winding 610.

[0139] In addition, the first flange portion 210 is provided with a recess 280 and a recess 290 that are recessed radially inward from the outer peripheral surface 210A.

[0140] The recess 280 is provided on the side 213 (circumferential side) relative to the through hole 240, and opens on the circumferential side, the other axial side and the radially outer side.

[0141] The recess 280 is formed by a bottom surface 281a, an outer wall surface 262, and a side surface 281b. The outer wall surface 262 is provided on one axial side of the bottom surface 281a, and the side surface 281b is provided on the other circumferential side of the bottom surface 281a. The bottom surface 281a of the recess 280 is formed as a flat surface extending along both the axial and circumferential directions.

[0142] The recess 290 is provided on the side 214 (the other side in the circumferential direction) opposite to the through hole 240, and opens on the other side in the circumferential direction, the other side in the axial direction, and the radially outward side.

[0143] The recess 290 is formed by a bottom surface 291a, an outer wall surface 272, and a side surface 291b. The outer wall surface 272 is provided on one axial side of the bottom surface 291a, and the side surface 291b is provided on one circumferential side of the bottom surface 291a. The bottom surface 291a of the recess 290 is formed as a flat surface extending along both the axial and circumferential directions.

[0144] As will be described later (see reference) Figure 27 , Figure 28 The recess 280 restricts the position of the circumferential side and the axial side of the end portion of the winding insulation member 310 on the other side of the circumferential direction. Additionally, the recess 290 restricts the position of the circumferential side and the axial side of the end portion of the winding insulation member 310 on one side of the circumferential direction.

[0145] The recess 280 corresponds to the "first recess of the first insulator" of the present invention, and the recess 290 corresponds to the "second recess of the first insulator" of the present invention.

[0146] In addition, such as Figure 5 As shown, the first flange portion 210 is provided with locking surfaces 213a and 214a to restrict the winding insulation member 310 from moving to the other side in the axial direction.

[0147] In this embodiment, a protrusion 213A is provided on the other side of the side surface 213 along the axial direction. Furthermore, a locking surface 213a extending circumferentially from the side surface 213 is formed on one side of the protrusion 213A along the axial direction. Additionally, a protrusion 214A is provided on the other side of the side surface 214 along the axial direction. Furthermore, a locking surface 214a extending circumferentially from the side surface 214 is formed on one side of the protrusion 214A along the axial direction. The locking surfaces 213a and 214a will be described later.

[0148] The locking surfaces 213a and 214a correspond to the "first movement restriction portion of the first insulator" and the "second movement restriction portion of the first insulator" of the present invention, respectively.

[0149] like Figure 6 , Figure 7As shown, the second flange portion 220 has a protrusion 221 that protrudes radially inward from the inner circumferential surface 220B. In this embodiment, the inner circumferential surface 220B is formed as a flat surface extending circumferentially and axially. The inner circumferential surface 220B has an inner circumferential surface portion 220B1 formed at a position on the opposite side of the through hole 240 axially.

[0150] The protrusion 221 has an end face 221A on the radially inner side, an outer wall face 221A1 on one circumferential side, an outer wall face 221A2 on the other circumferential side, and an outer wall face 225 on the other axial side. Furthermore, the outer wall face on the axial side of the protrusion 221 is formed by the end face 227 of the second flange 220.

[0151] In addition, the protrusion 221 has protrusion 221B, protrusion 221C, and protruding piece 226A on one side of the axial direction.

[0152] The protrusion 221B protrudes circumferentially from the protrusion 221 (outer wall surface 221A1). The protrusion 221B has an end face 221B1 on the other axial side. The end face 221B1 is continuously disposed with the outer wall surface 221A1 of the protrusion 221 and extends circumferentially and radially.

[0153] The protrusion 221C protrudes circumferentially from the protrusion 221 (outer wall surface 221A2) to the other side. The protrusion 221C has an end face 221C1 on the other side of the axial direction. The end face 221C1 is continuously disposed with the outer wall surface 221A2 of the protrusion 221 and extends circumferentially and radially.

[0154] The protruding piece 226A protrudes radially inward from the protrusion 221 (end face 221A).

[0155] In addition, the second flange portion 220 has a protrusion 226C that protrudes axially from the end face 227. Moreover, the protrusion 226C has a protrusion 226B that protrudes radially inward.

[0156] In addition, the second flange portion 220 is provided with overlapping portions 220E and 220F.

[0157] like Figure 6 , Figure 8 , Figure 9 As shown, the overlapping portion 220E is located on the circumferential side of the through hole 240 and extends along both the axial and circumferential directions.

[0158] The overlapping portion 220E is formed by an inner peripheral surface portion, a side surface 223, and an outer peripheral surface portion.

[0159] The inner peripheral surface portion has a first inner peripheral surface portion 220B21, a second inner peripheral surface portion 220B22, and a third inner peripheral surface portion 220B2 from the inner wall surface 243 forming the through hole 240 toward the side surface 223.

[0160] The second inner circumferential surface portion 220B22 extends radially outward from the connection portion connected to the first inner circumferential surface portion 220B21. The second inner circumferential surface portion 220B22 forms a stepped surface.

[0161] The third inner circumferential surface portion 220B2 extends circumferentially from the connecting portion connected to the second inner circumferential surface portion 220B22 toward the side surface 223. The third inner circumferential surface portion 220B2 is inclined radially inwardly with respect to the side surface 223. Furthermore, as... Figure 9 As shown, the angle between the extension direction of the third inner circumferential surface portion 220B2 (shown as a dashed line) and the extension direction of the circumferential center line of the first insulator 200A (shown as a single-dot dashed line) is s1 (<90 degrees).

[0162] The second inner peripheral surface portion 220B22 is continuous with the outer wall surface 221A1 of the protrusion 221. Thus, a recess is formed by the third inner peripheral surface portion 220B2, the second outer peripheral surface portion 220B22, the outer wall surface 221A1 of the protrusion 221, and the end face 211B1 of the protrusion 211B, which is recessed radially outward from the inner peripheral surface 220B.

[0163] The outer peripheral surface portion has a first outer peripheral surface portion 220B23, a second outer peripheral surface portion 220B24, and a third outer peripheral surface portion 220B25 extending from the side 223 toward the main body 230.

[0164] The first outer peripheral portion 220B23 extends circumferentially to the other side from the connection portion that connects to the side 223.

[0165] The second outer peripheral surface portion 220B24 extends radially outward from the connection portion connected to the first outer peripheral surface portion 220B23.

[0166] The third outer peripheral portion 220B25 extends circumferentially to the other side from the connection portion connected to the second outer peripheral portion 220B24. The third outer peripheral portion 220B25 extends at a right angle (including "approximately right angle") to the circumferential center line 200Ap of the first insulator 200A.

[0167] A portion of the recess, described later, for the top end of the central portion of the winding insulation member 310, is formed by the first outer peripheral surface portion 220B23 and the second outer peripheral surface portion 220B24 at a position radially outward from the side surface 223 (see reference). Figure 24 Furthermore, the remaining portion of the recess is formed by the second insulator 200B, which will be described later.

[0168] In this embodiment, the overlapping portion 220E corresponds to the "first overlapping portion" of the present invention, and the third inner circumferential surface portion 220B2 corresponds to the "first overlapping surface extending in the axial and circumferential directions" of the present invention.

[0169] Furthermore, the "recessed portion for arranging overlapping portions" of the present invention is formed by utilizing the third inner peripheral surface portion 220B2, the second inner peripheral surface portion 220B22, the outer wall surface 221A1 of the protrusion 221, and the end face 211B1 of the protrusion 211B.

[0170] Furthermore, the end face 221B1 of the protrusion 221B corresponds to the "second abutting portion that restricts the position of the overlapping portion on one side in the axial direction" of the present invention, and the outer wall surface 221A1 and the second inner peripheral surface portion 220B22 of the protrusion 221 correspond to the "first abutting portion that restricts the position of the overlapping portion on the other side in the circumferential direction" of the present invention.

[0171] Furthermore, the first outer peripheral surface portion 220B23 and the second outer peripheral surface portion 220B24 are used to form the "recess disposed on the radially inner side of the side surface of the first flange portion" of the present invention. Figure 24 Part of the recess N1) shown".

[0172] like Figure 6 , Figure 8 , Figure 10 As shown, the overlapping portion 220F is located on the other side of the circumference than the through hole 240, and extends along the axial and circumferential directions.

[0173] The overlapping portion 220F is symmetrical with respect to the circumferential center line 200Ap of the first insulator 200A. That is, the "circumferential side" and "circumferential side" in the overlapping portion 220E are the "circumferential side" and "circumferential side" in the overlapping portion 220F, respectively.

[0174] Except for the fact that the overlapping part 220F is linearly symmetrical, it has the same structure as the overlapping part 220E, so detailed description is omitted.

[0175] In this embodiment, the overlapping portion 220F corresponds to the "second overlapping portion" of the present invention, and the third inner circumferential surface portion 220B3 corresponds to the "second overlapping surface extending in the axial and circumferential directions" of the present invention.

[0176] Furthermore, the "recessed portion of the overlapping portion" of the present invention is formed by utilizing the third inner peripheral surface portion 220B3, the second inner peripheral surface portion 220B32, the outer wall surface 221A2 of the protrusion 221, and the end face 211C1 of the protrusion 211C.

[0177] Furthermore, the end face 221C1 of the protrusion 221C corresponds to the "second abutting portion that restricts the position of the overlapping portion on one side" of the present invention, and the outer wall surface 221A2 and the second inner peripheral surface portion 220B32 of the protrusion 221 correspond to the "first abutting portion that restricts the position of the overlapping portion on one side" of the present invention.

[0178] Furthermore, the first outer peripheral surface portion 220B33 and the second outer peripheral surface portion 220B34 are used to form the "recessed portion disposed on the radially inner side of the side surface of the first flange portion" of the present invention. Figure 25 Part of the recess N2) shown in ".

[0179] Next, refer to Figures 12-18 Explanation of the second insulator 200B. Figure 12 This is a three-dimensional view of the second insulator, 200B. Figure 13 Viewed from the direction of arrow XIII (radial outwards). Figure 12 The resulting image. Figure 14 Viewed from the direction of arrow XIV (radial inwards). Figure 12 The resulting image. Figure 15 Observing from the direction of arrow XV (one side of the circumference). Figure 12 The resulting image. Figure 16 Observing from the direction of arrow XVI-XVI Figure 12 The resulting sectional view. Figure 17 , Figure 18 They are respectively Figure 16 Enlarged view of the parts indicated by arrows XVII and XVIII.

[0180] Like the first insulator 200A, the second insulator 200B is formed of a resin with insulating properties.

[0181] In addition, the second insulator 200B, like the first insulator 200A, has a first flange portion 210, a second flange portion 400, and a main body 230.

[0182] The first flange portion 210 and the main body 230 of the second insulator 200B have the same structure as the first flange portion 210 and the main body 230 of the first insulator 200A, so the description is omitted.

[0183] Furthermore, in this embodiment, the recesses 280 and 290 of the first flange 210 correspond to the "first recess of the second insulator" and "second recess of the second insulator" of the present invention, respectively.

[0184] Furthermore, the locking surfaces 213a and 214a of the first flange portion 210 correspond to the "first movement restriction portion of the second insulator" and the "second movement restriction portion of the second insulator" of the present invention, respectively.

[0185] The second flange portion 400 is positioned radially inward compared to the first flange portion 210, and extends along both the axial and circumferential directions. Furthermore, the second flange portion 400 has an outer circumferential surface 400A on its radially outer side, an inner circumferential surface 400B on its radially inner side, an end face 401 on one axial side, an end face 402 on the other axial side, a side surface 403 on one circumferential side, and a side surface 404 on the other circumferential side.

[0186] like Figure 14 , Figure 15 As shown, the second flange portion 400 has a protrusion 405 that protrudes radially inward from the inner circumferential surface 400B. In this embodiment, the inner circumferential surface 400B is formed as a flat surface extending circumferentially and axially. The inner circumferential surface 400B has an inner circumferential surface portion 400B1 located on the axial side opposite to the through hole 240.

[0187] The protrusion 405 has an end face 405A on its radially inner side, an outer wall face 405A1 on one circumferential side, an outer wall face 405A2 on the other circumferential side, and an outer wall face 406 on the other axial side. Furthermore, the outer wall face on the axial side of the protrusion 405 is formed by the end face 401 of the second flange 400.

[0188] In addition, the protrusion 405 has a protruding piece 407A on one axial side and arc-shaped portions 405B and 405C on both circumferential sides.

[0189] The protruding piece 407A protrudes radially inward from the protrusion 405 (end face 405A).

[0190] In addition, the second flange portion 400 has a protrusion 407C that protrudes axially from the end face 401. Furthermore, the protrusion 407C has a protrusion 407B that protrudes radially inward.

[0191] In addition, the second flange portion 400 is provided with overlapping portions 400E and 400F.

[0192] like Figure 14 , Figure 16 , Figure 17 As shown, the overlapping portion 400E is located on the circumferential side of the through hole 240 and extends along both the axial and circumferential directions.

[0193] The overlapping portion 400E is formed by the inner peripheral surface portion, the side surface 403, and the outer peripheral surface portion.

[0194] The inner circumferential surface portion has a first inner circumferential surface portion 400B21 and a second inner circumferential surface portion 400B22 extending from the inner wall surface 243 forming the through hole 240 toward the side surface 403.

[0195] The overlapping portion 400E has an end face 451 on one axial side. The end face 451 of the overlapping portion 400E abuts against the end face 221C1 of the overlapping portion 220F, thereby restricting the position of the overlapping portion 220F (first insulator 200A) on one axial side.

[0196] The second inner circumferential surface portion 400B22 extends circumferentially from the connecting portion connected to the first inner circumferential surface portion 400B21 toward the side surface 403. The second inner circumferential surface portion 400B22 is inclined radially inward with the side surface 403 side facing it. Furthermore, the second inner circumferential surface portion 400B22 extends parallel (including "generally parallel") to the first outer circumferential surface portion 400B2.

[0197] The outer peripheral surface portion has a first outer peripheral surface portion 400B2, a second outer peripheral surface portion 400B23, a third outer peripheral surface portion 400B24, a fourth outer peripheral surface portion 400B25 and a fifth outer peripheral surface portion 400B26 from the side 403 toward the main body 230.

[0198] The first outer peripheral surface portion 400B2 extends circumferentially from the side surface 403 to the other side. The first outer peripheral surface portion 400B2 is inclined in a manner that is arranged radially inward with respect to the side surface 403. Figure 17 As shown, the angle between the extending direction of the first outer peripheral surface portion 400B2 (shown as a dashed line) and the extending direction of the circumferential center line 200Bp of the second insulator 200B (shown as a single-dot dashed line) is s2 (<90 degrees). Furthermore, the second inner peripheral surface portion 400B22 extends parallel (including "generally parallel") to the first outer peripheral surface portion 400B2.

[0199] The second outer peripheral surface portion 400B23 extends radially outward from the connection portion connected to the first outer peripheral surface portion 400B2. The third outer peripheral surface portion 400B24 extends circumferentially to the other side from the connection portion connected to the second outer peripheral surface portion 400B23. The fourth outer peripheral surface portion 400B25 extends radially outward from the connection portion connected to the third outer peripheral surface portion 400B24.

[0200] The fifth outer peripheral portion 400B26 extends circumferentially to the other side from the connection portion that connects to the fourth outer peripheral portion 400B25. The fifth outer peripheral portion 400B26 extends at a right angle (including "approximately right angle") to the circumferential center line 200Bp of the second insulator 200B.

[0201] As described later, the second outer peripheral surface portion 400B23 can be abutted against the side surface 224 of the second flange portion 220 of the first insulator 200A. This restricts the movement of the first insulator 200A to the other side in the circumferential direction.

[0202] As will be described later, the third outer peripheral surface portion 400B24 and the fourth outer peripheral surface portion 400B25 are used to form a recess N2 for the top end of the central portion of the winding insulation member 310 (see reference). Figure 25Specifically, a recess N2 is formed in a portion of the first insulator 200A located radially outward from the side surface 224 of the first insulator 200A, which abuts against the second outer peripheral surface portion 400B23. The remaining portion of the recess N2 is formed by the first insulator 200A.

[0203] In this embodiment, the overlapping portion 400E corresponds to the "third overlapping portion" of the present invention, and the first outer peripheral surface portion 400B2 corresponds to the "third overlapping surface extending in the axial and circumferential directions" of the present invention.

[0204] Furthermore, the second outer peripheral surface portion 400B23 corresponds to the "abutment portion that restricts the position of the second overlapping portion on the other side of the circumference" of the present invention.

[0205] Furthermore, the third outer peripheral surface portion 400B24 and the fourth outer peripheral surface portion 400B25 are used to form the "recessed portion disposed on the radially inner side of the side surface of the second overlapping portion" of the present invention. Figure 25 The recess N2 shown in the figure. The third outer peripheral surface portion 400B24 and the fourth outer peripheral surface portion 400B25 correspond to the "partial recess forming surface of the recess forming part" of the present invention.

[0206] like Figure 14 , Figure 16 , Figure 19 As shown, the overlapping portion 400F is located on the other side of the circumference than the through hole 240, and extends along the axial and circumferential directions.

[0207] The overlapping portion 400F is symmetrical with respect to the circumferential center line 200Bp of the second insulator 200B. That is, the "circumferential side" and "circumferential side" in the overlapping portion 400E are the "circumferential side" and "circumferential side" in the overlapping portion 400F, respectively.

[0208] Except for the fact that the overlapping part 400F is linearly symmetrical, it has the same structure as the overlapping part 400E, therefore, detailed description is omitted.

[0209] Furthermore, the overlapping portion 400F has an end face 452 on one axial side. The end face 452 of the overlapping portion 400F abuts against the end face 221B1 of the overlapping portion 220E, thereby restricting the position of the overlapping portion 220E (first insulator 200A) on one axial side.

[0210] In this embodiment, the overlapping portion 400F corresponds to the "fourth overlapping portion" of the present invention, and the first outer peripheral surface portion 400B3 corresponds to the "fourth overlapping surface extending in the axial and circumferential directions" of the present invention.

[0211] Furthermore, the second outer peripheral surface portion 400B33 corresponds to the "abutment portion that restricts the movement of the first overlapping portion to one side in the circumferential direction" of the present invention.

[0212] Furthermore, the "recessed portion disposed on the radially inner side of the side surface of the first overlapping portion" of the present invention is formed using the third outer peripheral surface portion 400B34 and the fourth outer peripheral surface portion 400B35. The third outer peripheral surface portion 400B34 and the fourth outer peripheral surface portion 400B35 correspond to the "partial recessed portion forming surface" of the present invention.

[0213] Insulator 1, 200A, such as Figure 11 The tooth 121 (tooth base 122) is installed on the first core member 120 as shown.

[0214] Second insulator 200B, such as Figure 19 The tooth 121 (tooth base 122) is installed on the first core member 120 as shown.

[0215] Furthermore, the end of the tooth base 122 is inserted into the through hole 240 laterally from the second flange portion 220 or the second flange portion 400.

[0216] Next, refer to Figures 26-28 The method of mounting the first insulator 200A and the second insulator 200B onto the tooth 121 (specifically the tooth base 122) of the first core member 120 is described.

[0217] like Figure 20 As shown, after the second insulator 200B is installed on the tooth 121, the first insulator 200A is installed on the tooth 121. Furthermore, the first insulator 200A and the second insulator 200B are arranged alternately.

[0218] For example, the second inner peripheral surface portion 220B2 of the overlapping portion 220E of the first insulator 200A is disposed radially outside the first outer peripheral surface portion 400B3 of the overlapping portion 400F of the second insulator 200B. In this state, the overlapping portion 220E is moved axially to one side. Then, the end face 452 of the overlapping portion 400F abuts against the end face 221B1 of the overlapping portion 220E, and the side face 404 of the overlapping portion 400F abuts against the second inner peripheral surface portion 220B32 of the overlapping portion 220E.

[0219] Therefore, as Figure 21 As shown, the first insulator 200A and the second insulator 200B are alternately mounted on the teeth 121 of the first core member 120.

[0220] Furthermore, the angle formed by the extension direction of the circumferential centerline of the insulator and the extension direction of the overlapping surface is set to be the angle corresponding to the opening angle of two adjacent teeth in the circumferential direction when the overlapping surfaces are overlapping.

[0221] Reference Figure 24 This needs to be explained.

[0222] The overlapping state of adjacent overlapping portions 220E and 400F is such that the third inner peripheral surface portion 220B2 (overlapping surface) of overlapping portion 220E overlaps with the first outer peripheral surface portion 400B3 (overlapping surface) of overlapping portion 400F. Figure 24 In the overlapping portion 220E, the third inner peripheral surface portion 220B2 (overlapping surface) is positioned radially outward from the first outer peripheral surface portion 400B3 (overlapping surface) of the overlapping portion 400F.

[0223] The opening angle T between adjacent insulators is the angle S formed by the circumferential center line 200Ap of the first insulator 200A and the circumferential center line 200Bp of the second insulator 200B adjacent to the first insulator 200A, when the adjacent first insulator 200A and second insulator 200B are installed on the tooth 121. Figure 3 As shown, the opening angle T of the tooth is the angle formed by the circumferential center lines of the adjacent teeth 121 in the circumferential direction.

[0224] When viewed from one axial side (refer to) Figure 24 The angle formed by the extension direction of the circumferential center line 200Ap of the first insulator 200A (shown as a dashed line) and the extension line of the overlapping surface 220B2 of the overlapping portion 220E (shown as a dashed line) is defined as s1. The angle formed by the extension direction of the circumferential center line 200Bp of the second insulator 200B (shown as a dashed line) and the extension line of the overlapping surface 400B3 of the overlapping portion 400F (shown as a dashed line) is defined as s2.

[0225] In this embodiment, the sum of angles s1 and s2 is set as a predetermined angle corresponding to the opening angle T of tooth 121. Preferably, the predetermined angle is set to be approximately equal to the opening angle T. Furthermore, it is preferable that angles s1 and s2 are set to be approximately equal to (1 / 2) of the opening angle T.

[0226] exist Figure 24 , Figure 25 The diagram shows an enlarged view of the main parts with the first insulator 200A and the second insulator 200B mounted on the teeth 121 of the first core member 120.

[0227] exist Figure 24 The diagram shows the radial overlap of the overlapping portion 220E of the adjacent first insulator 200A and the overlapping portion 400F of the second insulator 200B.

[0228] In addition, Figure 25 The diagram shows the radial overlap of the overlapping portion 220F of the adjacent first insulator 200A and the overlapping portion 400E of the second insulator 200B.

[0229] In this embodiment, adjacent insulators overlap in regions extending circumferentially and axially, thereby improving the insulation characteristics between the stator winding 610 wound around the first insulator 200A and the second insulator 200B and the tooth tip 123 of the tooth 121.

[0230] This prevents poor insulation.

[0231] In addition, increasing the number of turns of the stator winding 610 wound on the insulator can improve the slot fill factor of the stator winding 610 in the slot.

[0232] Next, refer to Figures 26-28 This describes the operation of inserting the winding insulation member 310 between adjacent stator windings 610 of different phases.

[0233] In this embodiment, such as Figure 27 As shown, an insulating film with edges 310a to 310d is formed by bending along axially extending bend lines 311A ​​to 311C. The winding insulation member 310 has a central portion with a first central portion 310B and a second central portion 310C formed by bending, and a pair of ends 310A and 310D that are bent from both circumferential ends of the central portion in a direction away from each other.

[0234] The winding insulation member 310 is disposed within recesses 280 and 290 that are adjacent in the circumferential direction. For example, it is disposed within recesses 280 of the first insulator 200A and recesses 290 of the second insulator 200B that are adjacent in the circumferential direction. The central portion is inserted between the first insulator 200A and the second insulator 200B.

[0235] In this embodiment, since the recesses 280 and 290 are open on the other side of the axial direction, the winding insulation member 310 can be easily inserted from the other side of the axial direction.

[0236] The positions of a pair of ends 310A and 310D disposed within the recesses 280 and 290 in the circumferential and axial directions are limited by the wall surfaces forming the recesses 280 and 290.

[0237] exist Figure 28 The diagram shows the state in which the winding insulation member 310 is inserted.

[0238] In this embodiment, a locking surface 213a extending circumferentially to one side is formed on the axial side of the side surface 213 of the first flange portion 210. In addition, a locking surface 214a extending circumferentially to the other side is formed on the axial side of the side surface 214 of the first flange portion 210.

[0239] The movement of the winding insulation member 310 inserted into the slot to the other side of the axial direction is restricted by the locking surface 213a or 214a. Specifically, the portion of the edge 310c corresponding to the end 310A (the portion corresponding to the end 310D) abuts against the locking surface 214a (213a), thereby restricting the movement of the winding insulation member 310 to the other side of the axial direction.

[0240] This prevents the winding insulation component 310 from detaching from the slot.

[0241] In addition, such as Figure 24 , Figure 25 As shown, the top end of the central portion of the winding insulation member 310 is disposed in the recesses N1 and N2.

[0242] Therefore, it is possible to prevent the movement of the winding insulation member 310 and to prevent poor insulation caused by the movement of the winding insulation member 310.

[0243] The present invention is not limited to the structure described in the above embodiments, but can be modified, added to, or deleted in various ways.

[0244] The shapes of the first insulator and the second insulator are only required to allow adjacent first insulators and second insulators in the circumferential direction to overlap, and are not limited to the shapes described in the embodiments.

[0245] In this embodiment, two types of insulators, a first insulator and a second insulator, are used, but three or more types of insulators can also be used. Furthermore, a single type of insulator can also be used. For example, the overlapping portions on one circumferential side and the overlapping portions on the other circumferential side of the insulator can be insulators with overlapping portions having a shape that allows them to overlap.

[0246] In the embodiments, the stator has been described, but the present invention can also be configured as an "insulator" or an "electric motor including a stator having an insulator and a rotor supported so as to be able to rotate relative to the stator".

[0247] Furthermore, the shape of the winding insulation member is not limited to the shape described in the embodiments.

[0248] The structures described in the embodiments can be used individually or in combination with appropriately selected structures.

Claims

1. An insulator, respectively mounted on a plurality of teeth arranged circumferentially and extending radially and axially, characterized in that, The insulator includes a first insulator and a second insulator. The first insulator and the second insulator each have: a first flange portion that extends along the circumferential direction and the axial direction; A second flange portion, positioned radially inward of the first flange portion, extends along the circumferential and axial directions; and a main body portion, extending radially, connects the first and second flange portions, and has a through hole formed on its inner side for the insertion of the teeth. In the second flange portion, overlapping portions extending along the axial direction and the circumferential direction are formed at positions both circumferentially closer to the through hole and circumferentially closer to the through hole. The configuration is such that, with the first insulator and the second insulator alternately mounted on the plurality of teeth, two adjacent overlapping portions in the circumferential direction overlap in the radial direction. One of the two overlapping portions in the radial direction forms an abutment portion that restricts the position of the other overlapping portion. The abutting portion of the overlapping portion includes a second abutting portion that can abut against the end wall of the axial side of the other overlapping portion when the other overlapping portion overlaps the overlapping portion from the circumferential side; or, the abutting portion of the overlapping portion includes a second abutting portion that can abut against the end wall of the axial side of the other overlapping portion when the other overlapping portion overlaps the overlapping portion from the other circumferential side.

2. The insulator according to claim 1, characterized in that, The abutting portion of the overlapping portion further includes a first abutting portion that can abut against the side of the other overlapping portion on the circumferential side when the other overlapping portion overlaps the overlapping portion from the other circumferential side; or, the abutting portion of the overlapping portion further includes a first abutting portion that can abut against the side of the other overlapping portion on the circumferential side when the other overlapping portion overlaps the overlapping portion from the other circumferential side.

3. The insulator according to claim 2, characterized in that, The other of the two overlapping portions is formed with an abutting portion that can be abutted by the first overlapping portion. The abutting portion of the other overlapping portion is configured such that, when the one overlapping portion overlaps the other overlapping portion from the circumferential side, it can abut against the side of the other circumferential side of the one overlapping portion; and, when the one overlapping portion overlaps the other overlapping portion from the other circumferential side, it can abut against the side of the other circumferential side of the one overlapping portion.

4. The insulator according to claim 3, characterized in that, Each of the overlapping portions has an overlapping surface extending along the circumferential direction and the axial direction. The two overlapping portions overlap such that the overlapping surface of one overlapping portion is positioned radially outward than the overlapping surface of the other overlapping portion. The other overlapping portion has a recess-forming surface that forms a recess at a position radially outward compared to the abutting portion formed in the other overlapping portion. The overlapping portion has a remaining partial recess forming surface that forms the recess, located radially outward from the side of the abutting portion that abuts the other overlapping portion.

5. The insulator according to any one of claims 1 to 4, characterized in that, Each of the overlapping portions has an overlapping surface extending along the circumferential direction and the axial direction. The insulator is configured such that, when the overlapping surfaces of one overlapping portion and the overlapping surfaces of the other overlapping portion are facing each other and overlapping to the ground, the opening angle of the first insulator and the second insulator adjacent in the circumferential direction corresponds to the opening angle of the tooth adjacent in the circumferential direction.

6. The insulator according to any one of claims 1 to 4, characterized in that, Each of the overlapping portions has an overlapping surface extending along the circumferential direction and the axial direction. The two overlapping portions overlap in such a way that the overlapping surfaces of the overlapping portions of the first insulator are positioned radially outward compared to the overlapping surfaces of the overlapping portions of the second insulator.

7. A stator having a stator core, a plurality of insulators, and stator windings, The stator core has a circumferentially extending yoke and a plurality of teeth arranged circumferentially apart and extending radially inward from the yoke. The insulator is mounted on the tooth. The stator winding is wound on the insulator mounted on the teeth. The stator is characterized by, The insulator used is the insulator according to any one of claims 1 to 6.

8. The stator according to claim 7, characterized in that, The stator also has winding insulation components. The winding insulation member has a central portion extending axially and radially, and a pair of ends that bend away from each other at both circumferential ends of the central portion and extend axially and circumferentially. The first flange portion of the first insulator and the second insulator have an outer peripheral surface on the radially outer side. In the outer peripheral surface of the first flange, a first recess is formed at a position on the circumferential side relative to the through hole, and a second recess is formed at a position on the circumferential side relative to the through hole. The circumferential side, the axial side, and the radially outer opening of the first recess; the circumferential side, the axial side, and the radially outer opening of the second recess. The central portion of the winding insulation member is disposed between the first insulator and the second insulator that are adjacent in the circumferential direction, and one of the pair of ends is disposed in the first recess of one of the first insulator and the second recess of the other of the circumferentially adjacent first insulator and second insulator, respectively.

9. The stator according to claim 8, characterized in that, The first flange of the first insulator and the second insulator have side surfaces on one circumferential side and the other circumferential side. At least one of the side surfaces on one circumferential side and the other circumferential side has a protrusion formed at a position on the opposite side of the axial direction. The protrusion formed on one side of the circumferential direction protrudes from the side of the circumferential direction toward the circumferential direction, and the protrusion formed on the other side of the circumferential direction protrudes from the side of the other side of the circumferential direction toward the other side of the circumferential direction. The movement of the winding insulation member toward the other side of the axial direction is restricted by the protrusion formed on at least one of the circumferential side and the circumferential side of the first flange.

10. The stator according to any one of claims 7 to 9, characterized in that, The stator core is composed of a first core member having the magnetic yoke and a second core member having the plurality of teeth.

11. An electric motor having a stator and a rotor configured to rotate relative to said stator, characterized in that, The stator described in any one of claims 7 to 10 is used as the stator.

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