Stator for rotating electric machine

Abstract

The stator of a rotary electric motor comprises a stator core having a cylindrical yoke and a plurality of teeth, a coil formed by winding a coil around each tooth, and an insulator. The insulator has a cylindrical insulator base positioned in a position overlapping the yoke in its axial direction. The insulator base has a first circumferential surface on a first radial side in the yoke, a second circumferential surface on a second side opposite to the first radial side, a lead-out groove for drawing a lead wire of the coil from the first radial side to the second side, and a return groove for returning the lead wire drawn from the lead-out groove to the first side from the second radial side. The lead-out groove holds the lead wire by tightening it. The return groove holds the lead wire by gap fitting it.

Description

Technology Field

[0001] The present disclosure relates to a stator of a rotary electric motor. Background Technology

[0002] For example, as disclosed in Japanese Patent Publication No. 2010-259318, a stator of a rotary electric motor comprises a stator core, a coil, and an insulator. The stator core has a cylindrical yoke and a plurality of teeth. The plurality of teeth extend from the circumferential surface of the yoke in the diameter direction of the yoke. The coil is formed by winding a coil onto each tooth. The coil includes a coil end. The coil end protrudes from the core cross-section, which is a cross-section located in the axial direction of the yoke in the stator core. The insulator is positioned opposite the core cross-section. The insulator insulates the coil end from the core cross-section. The insulator has a cylindrical insulator base positioned in a position overlapping the axial direction with respect to the yoke. The insulator base has a first circumferential surface on the first side where the coil end is located in its radial direction, and a second circumferential surface on the second side opposite to the first side in its radial direction.

[0003] The coil has a winding section formed by winding the coil onto the teeth in a concentrated winding. From the winding section, a lead wire at the end of the winding, which is part of the winding, is drawn out. Here, the winding start portion of the winding section is fixed as the coil is wound onto the teeth. Therefore, the winding start portion of the winding section is prevented from becoming loose. On the other hand, in order to prevent the winding end portion of the winding section from becoming loose, it is necessary to fix the lead wire at the end of the winding.

[0004] Therefore, the insulator base may have a pull-out groove and a return groove. The pull-out groove is opened at the insulator end, which is the end of the insulator base opposite to the stator core. The pull-out groove has a first stage that opens on the first circumferential surface of the insulator base and a second stage that opens on the second circumferential surface of the insulator base. The pull-out groove draws out a lead wire from the first side in the radial direction of the insulator base to the second side. The return groove is opened at the insulator end. The return groove has a first stage that opens on the first circumferential surface of the insulator base and a second stage that opens on the second circumferential surface of the insulator base. The return groove is positioned adjacent to the pull-out groove in the circumferential direction of the insulator base. And, the return groove returns the lead line drawn from the withdrawal groove from the second side in the diameter direction of the insulator base to the first side.

[0005] In this way, the lead wire passes through the draw-out groove and is drawn out to the second side in the diametrical direction of the insulator base, and simultaneously passes through the return groove and is returned to the first side in the diametrical direction of the insulator base, thereby securing the lead wire to the insulator. Accordingly, since the lead wire is secured to the insulator, the loosening of the winding end portion of the winding section is prevented. Prior art literature

[0006] Japanese Patent Publication No. 2010-259318 The problem to be solved

[0007] However, if the lead wire is not secured by tightening it in at least one of the pull-out groove and the return groove, the binding of the lead wire to the insulator becomes unstable. As a result, there is a risk that the winding end portion of the winding section may become loose. On the other hand, for example, if the return groove secures the lead wire by tightening it, when returning the lead wire drawn from the pull-out groove to the second side in the radial direction of the insulator base through the return groove to the first side in the radial direction of the insulator base, one might consider pulling the lead wire from the first side in the radial direction of the insulator base while avoiding interference with other lead wires at the coil end. In this case, there is a risk that it will be difficult to avoid interference with other lead wires. Consequently, the process of binding and securing the lead wire to the insulator becomes cumbersome. means of solving the problem

[0008] A stator of a rotary electric motor according to one aspect of the present disclosure comprises a cylindrical yoke and a stator core having a plurality of teeth extending in the diameter direction of the yoke from the circumferential surface of the yoke, and a coil formed by winding a coil on each of the teeth, wherein the coil comprises a coil end protruding from a core cross section located in the axial direction of the yoke in the stator core, and an insulator disposed opposite to the core cross section and insulating between the coil end and the core cross section. The coil comprises a winding portion formed by winding the coil on the teeth in a concentrated winding and a winding end lead wire that is part of the winding drawn out from the winding portion. The insulator has a cylindrical insulator base disposed at a position overlapping the axial direction with respect to the yoke. The above-mentioned insulator base comprises a first circumferential surface on a first side in the radial direction where the coil end is located, a second circumferential surface on a second side opposite to the first side in the radial direction, an insulator end on the side opposite to the stator core in the insulator base, and a pull-out groove opening at the insulator end, wherein the pull-out groove has a first end opening at the first circumferential surface and a second end opening at the second circumferential surface, and pulls the pull-out wire from the first side in the radial direction to the second side, and a return groove opening at the insulator end, wherein the return groove has a first end opening at the first circumferential surface and a second end opening at the second circumferential surface, and the return groove is positioned at a location adjacent to each other in the radial direction of the insulator base with respect to the pull-out groove, and the pull-out wire pulled from the pull-out groove It has a return groove that returns the lead wire from the second side in the diameter direction to the first side. The lead groove holds the lead wire by tightening it.The above return groove holds the above lead line by fitting it into the gap.

[0009] A stator of a rotary electric motor according to a separate aspect of the present disclosure comprises a cylindrical yoke and a stator core having a plurality of teeth extending in the diameter direction of the yoke from the circumferential surface of the yoke, and a coil formed by winding a coil on each of the teeth, wherein the coil comprises a coil end protruding from a core cross section located in the axial direction of the yoke in the stator core, and an insulator disposed opposite to the core cross section and insulating between the coil end and the core cross section. The coil comprises a winding portion formed by winding the coil on the teeth in a concentrated winding and a winding end lead wire that is part of the winding drawn out from the winding portion. The insulator has a cylindrical insulator base disposed at a position overlapping the axial direction with respect to the yoke. The above-mentioned insulator base comprises a first circumferential surface on a first side where the coil end is located in the radial direction, a second circumferential surface on a second side opposite to the first side in the radial direction, an insulator end which is an end opposite to the stator core in the insulator base, and a pull-out groove opening at the insulator end, wherein the pull-out groove has a first end opening at the first circumferential surface and a second end opening at the second circumferential surface, and pulls the pull-out wire from the first side in the radial direction to the second side, and a return groove opening at the insulator end, wherein the return groove has a first end opening at the first circumferential surface and a second end opening at the second circumferential surface, and is positioned at a location adjacent to each other in the radial direction of the insulator base with respect to the pull-out groove, and the pull-out wire pulled from the pull-out groove in the radial direction It has a return groove that returns from the second side to the first side. The return groove has a pair of return groove forming surfaces located on both sides in the circumferential direction with respect to the lead line.When viewing the above return groove from the axial direction, the pair of return groove forming surfaces are inclined in a way that they gradually separate from the pull-out groove as they extend from the second circumferential surface toward the first circumferential surface. The width between the pair of return groove forming surfaces is smaller than the outer diameter of the original shape of the pull-out line. Brief explanation of the drawing

[0010] FIG. 1 is a cross-sectional view showing the stator and rotor of a rotating electric motor in a first embodiment. FIG. 2 is an exploded perspective view showing a stator core and two insulators equipped with the stator of FIG. 1. Fig. 3 is a perspective view of the stator of Fig. 1. FIG. 4 is another perspective view of the stator of FIG. 1. FIG. 5 is a side view showing an enlarged portion of the stator of FIG. 1. FIG. 6 is a cross-sectional view showing an enlarged portion of the stator of FIG. 1. FIG. 7 is a drawing for explaining the process of bundling and fixing the lead wires of the stator of FIG. 1 to the insulator. FIG. 8 is a drawing for explaining the process of bundling and fixing the lead wires of the stator of FIG. 1 to the insulator. FIG. 9 is a drawing for explaining the process of bundling and fixing the lead wires of the stator of FIG. 1 to the insulator. FIG. 10 is a drawing for explaining the process of bundling and fixing the lead wires of the stator of FIG. 1 to the insulator. FIG. 11 is a perspective view showing an enlarged portion of the stator in the second embodiment. FIG. 12 is a front view showing an enlarged portion of the stator of FIG. 11. FIG. 13 is a side view showing an enlarged portion of the stator in the modified example. FIG. 14 is a front view showing an enlarged portion of the stator in another modified example. Specific details for implementing the invention

[0011] (Form for carrying out the invention)

[0012] [First Embodiment]

[0013] Hereinafter, a first embodiment of a stator for a rotating electric motor is described according to FIGS. 1 to 10.

[0014] <Basic Components of Rotating Electricity>

[0015] As shown in FIG. 1, the rotary electric motor (10) is equipped with a stator (11) and a rotor (12). The stator (11) is cylindrical in shape. The rotor (12) is positioned inside the stator (11). The rotor (12) has a cylindrical rotor core (13) and a plurality of permanent magnets not shown embedded in the rotor core (13). The rotor core (13) is fixed to a rotation axis (14). The rotor core (13) is configured to rotate integrally with the rotation axis (14).

[0016] As shown in FIGS. 1 and 2, the stator (11) is equipped with a stator core (23). The stator core (23) has a yoke (24) and a plurality of teeth (25). The yoke (24) is cylindrical in shape. The plurality of teeth (25) are arranged in the diameter direction of the yoke (24) from the inner circumferential surface (24a), which is the circumferential surface of the yoke (24). The plurality of teeth (25) are spaced apart in the circumferential direction of the yoke (24). The plurality of teeth (25) are arranged at equal intervals in the circumferential direction of the yoke (24). In addition, the circumferential direction of the yoke (24) is also the circumferential direction of the stator core (23). Each tooth (25) extends from the inner circumferential surface (24a) of the yoke (24) toward the axis of the stator core (23). In this embodiment, the stator core (23) has 12 teeth (25). Also, the number of teeth (25) is not particularly limited, but the number of teeth (25) is a multiple of 3.

[0017] As shown in FIG. 2, the two cross-sections located in the axial direction of the yoke (24) have a flat surface shape. The two cross-sections located in the axial direction of the yoke (24) in each tooth (25) have a flat surface shape. The axial length of the yoke (24) is the same as the axial length of the yoke (24) in each tooth (25). The cross-section located on the first axial side of the yoke (24) is located on the same plane as the cross-section located on the first axial side of the yoke (24) in each tooth (25). The cross-section located on the second axial side of the yoke (24) is located on the same plane as the cross-section located on the second axial side of the yoke (24) in each tooth (25).

[0018] The cross section located on the first axial side of the yoke (24) and the cross section located on the first axial side of the yoke (24) in each tooth (25) form a first core cross section (23a) which is a cross section located on the first axial side of the yoke (24) in the stator core (23). The cross section located on the second axial side of the yoke (24) and the cross section located on the second axial side of the yoke (24) in each tooth (25) form a second core cross section (23b) which is a cross section located on the second axial side of the yoke (24) in the stator core (23). The first core cross section (23a) and the second core cross section (23b) are core cross sections located on the axial side of the yoke (24) in the stator core (23).

[0019] As shown in FIGS. 1 and 2, each tooth (25) has a tooth joint (26) and a tooth blade base (27). The tooth joint (26) is in the shape of a thin plate extending from the inner circumferential surface (24a) of the yoke (24). The tooth joint (26) extends from the first core cross section (23a) of the stator core (23) to the second core cross section (23b). The tooth blade base (27) protrudes from the end opposite to the end connected to the yoke (24) in the tooth joint (26) to both sides in the circumferential direction of the yoke (24).

[0020] As shown in FIG. 2, the stator (11) is equipped with two insulators (50). Each insulator (50) is cylindrical in shape. Each insulator (50) is made of, for example, a resin material. Each insulator (50) has an insulator base (51) and a plurality of insulator teeth (52). The insulator base (51) is cylindrical in shape. Each insulator (50) is positioned relative to the stator core (23) such that the axis of the insulator base (51) coincides with the axis of the yoke (24). The insulator base (51) is positioned relative to the yoke (24) in a position that overlaps with the axial direction of the yoke (24). The circumferential direction of the insulator base (51) coincides with the circumferential direction of the yoke (24). The diameter direction of the insulator base (51) coincides with the diameter direction of the yoke (24).

[0021] One of the two insulators (50) is positioned opposite the first core cross-section (23a) while in contact with the first core cross-section (23a) of the stator core (23). The other of the two insulators (50) is positioned opposite the second core cross-section (23b) while in contact with the second core cross-section (23b) of the stator core (23). Additionally, in the following description, among the two insulators (50), the insulator (50) positioned opposite the first core cross-section (23a) of the stator core (23) may be referred to as the "first insulator (501)," and the insulator (50) positioned opposite the second core cross-section (23b) may be referred to as the "second insulator (502)." The outer diameter of the insulator base (51) is smaller than the outer diameter of the yoke (24). The inner diameter of the insulator base (51) is the same as the inner diameter of the yoke (24).

[0022] Each insulator tooth (52) extends in a radial direction from the inner surface (51a) of the insulator base (51). Multiple insulator tooth (52) are spaced apart in the circumferential direction of the insulator base (51). Multiple insulator tooth (52) are spaced equally apart in the circumferential direction of the insulator base (51). Each insulator tooth (52) extends from the inner surface (51a) of the insulator base (51) toward the axis of the insulator base (51). In this embodiment, the insulator (50) has 12 insulator tooth (52) teeth. The number of insulator tooth (52) teeth is equal to the number of teeth (25) of the stator core (23).

[0023] Each insulator tooth portion (52) has an insulator joint portion (53) and an insulator blade portion (54). The insulator joint portion (53) is a column shape extending from the inner circumferential surface (51a) of the insulator base (51). The circumferential width of the insulator base (51) in each insulator joint portion (53) is the same as the circumferential width of the yoke (24) in each tooth joint portion (26). Each insulator joint portion (53) is in contact with the corresponding tooth (25). The insulator blade portion (54) protrudes along the insulator base (51) from the end opposite to the end connected to the insulator base (51) in the insulator joint portion (53).

[0024] A plurality of cross-line receiving grooves (61) are formed on the outer surface (51b) of the insulator base (51) of the first insulator (501). The plurality of cross-line receiving grooves (61) are arranged in parallel along the axial direction of the insulator base (51). Each cross-line receiving groove (61) runs in a circular direction of the yoke (24). Each cross-line receiving groove (61) runs along the entire circumference of the outer surface (51b) of the insulator base (51). Each cross-line receiving groove (61) does not penetrate the insulator base (51) in a radial direction.

[0025] In the insulator base (51) of the first insulator (501), a plurality of through grooves (62) are formed. Each through groove (62) penetrates the insulator base (51) in the radial direction. The sum of the number of through grooves (62) corresponds to the number of teeth (25). Each through groove (62) extends in the axial direction of the insulator base (51) from the insulator end (51e), which is the end opposite to the stator core (23) in the insulator base (51).

[0026] As shown in FIG. 1, the stator (11) is equipped with a three-phase coil (28). The coil (28) has a plurality of winding sections (30). The winding section (30) is formed by winding a coil (31) in a concentrated winding manner to integrate and surround the tooth section (26) arranged parallel to the axial direction of the stator (11) and the insulator section (53) of two insulators (50). Accordingly, the winding section (30) is formed by winding a coil (31) in a concentrated winding manner on the tooth (25).

[0027] In addition, the winding operation of the winding (31) for the tooth joint (26) of each phase coil (28) and the insulator joint (53) of the two insulators (50) is performed automatically, for example, by a winding facility equipped with a winding nozzle.

[0028] As shown in FIG. 3, a part of the winding portion (30) is a first coil end (281) protruding from the first core cross section (23a). Thus, the first coil end (281) is a coil end protruding from the first core cross section (23a). The first coil end (281) is a part of the coil (28).

[0029] As shown in FIG. 4, a part of the winding portion (30) is a second coil end (282) protruding from the second core cross section (23b). Thus, the second coil end (282) is a coil end protruding from the second core cross section (23b). The second coil end (282) is a part of the coil (28).

[0030] In this way, the coil (28) includes a first coil end (281) protruding from the first core cross section (23a). Additionally, the coil (28) includes a second coil end (282) protruding from the second core cross section (23b). Thus, the coil (28) includes a coil end protruding from the core cross section. In this way, the coil (28) is formed by winding (31) around each tooth (25).

[0031] As shown in FIG. 3, the first insulator (501) insulates the first coil end (281) and the first core cross section (23a). Thus, the first insulator (501) insulates the coil (28) and the first core cross section (23a). The inner circumferential surface (51a) of the insulator base (51) of the first insulator (501) is the first circumferential surface on the first side where the first coil end (281) is located in the radial direction of the insulator base (51). The outer circumferential surface (51b) of the insulator base (51) of the first insulator (501) is the second circumferential surface on the second side opposite to the first side in the radial direction of the insulator base (51).

[0032] As shown in FIG. 4, the second insulator (502) insulates the space between the second coil end (282) and the second core cross section (23b). Thus, the second insulator (502) insulates the space between the coil (28) and the second core cross section (23b). The inner circumferential surface (51a) of the insulator base (51) of the second insulator (502) is the first circumferential surface on the first side where the second coil end (282) is located in the radial direction of the insulator base (51). The outer circumferential surface (51b) of the insulator base (51) of the second insulator (502) is the second circumferential surface on the second side opposite to the first side in the radial direction of the insulator base (51). In this way, the insulator base (51) has a first circumferential surface on the first side where the coil end is located in the diameter direction of the insulator base (51), and a second circumferential surface on the second side opposite to the first side in the diameter direction of the insulator base (51).

[0033] As shown in FIG. 3, a cross line (32), which is part of a winding (31), is drawn out from the winding portion (30) of each phase coil (28). The cross line (32) of each phase coil (28) is drawn out from the first coil end (281). The cross line (32) of each phase coil (28) connects the winding portions (30) forming the corresponding phase coil (28) in series. Each cross line (32) is guided in the circumferential direction of the yoke (24) while being received in the cross line receiving groove (61) through the through groove (62).

[0034] As shown in FIG. 4, a lead wire (34) for winding, which is part of the winding (31), is drawn out from the winding portion (30) of each phase coil (28). The lead wire (34) of each phase coil (28) is drawn out from the second coil end (282). The lead wire (34) of each phase coil (28) is electrically connected to a connection terminal not shown, which is housed within a cluster block (40). Power from an external power source is supplied to the lead wire (34) of each phase coil (28) through the connection terminal.

[0035] Power from an external power source is input to the lead wires (34) of the three-phase coils (28), respectively. In this way, power is input to the three-phase coils (28), causing the rotor (12) and the rotation shaft (14) to rotate as a single unit.

[0036] From the winding portion (30) of each phase coil (28), a lead wire (35) of the end of the winding, which is part of the winding (31), is drawn out. The lead wire (35) of each phase coil (28) is drawn out from the second coil end (282). The lead wires (35) of the three phase coils (28) are electrically connected to each other to form a neutral point.

[0037] <Withdrawal Home>

[0038] The insulator base (51) of the second insulator (502) has multiple extraction grooves (70). The extraction grooves (70) are opened at the insulator end (51e), which is the end opposite to the stator core (23) in the insulator base (51). The extraction grooves (70) penetrate the insulator base (51) in the diameter direction of the yoke (24). The extraction grooves (70) have a first end that opens to the inner surface (51a) of the insulator base (51) and a second end that opens to the outer surface (51b) of the insulator base (51). The extraction grooves (70) draw out the extraction line (35) from the first side in the diameter direction of the insulator base (51) to the second side. In this way, the extraction groove (70) extracts the extraction line (35) from the inner side in the diameter direction of the yoke (24) to the outer side from the insulator base (51).

[0039] As shown in FIG. 5, the extraction groove (70) has a pair of extraction groove forming surfaces (71) and a connecting surface (72). When viewing the extraction groove (70) from the diametrical direction of the yoke (24), the pair of extraction groove forming surfaces (71) extend parallel to each other as they extend from the insulator end (51e) in the axial direction of the yoke (24). The pair of extraction groove forming surfaces (71) are located on both sides in the circumferential direction of the yoke (24) with respect to the extraction line (35). When viewing the extraction groove (70) from the axial direction of the yoke (24), the pair of extraction groove forming surfaces (71) are in a straight line shape along the diametrical direction of the yoke (24) from the outer surface (51b) of the insulator base (51) toward the inner surface (51a). The connecting surface (72) connects the ends opposite to the insulator ends (51e) in the pair of extraction groove forming surfaces (71). When viewing the extraction groove (70) from the diameter direction of the yoke (24), the connecting surface (72) extends in the circumferential direction of the yoke (24).

[0040] The width (H1) between the pair of extraction groove forming surfaces (71) is smaller than the outer diameter (D1) of the circular shape of the extraction line (35). Therefore, when the extraction line (35) passes between the pair of extraction groove forming surfaces (71), it is pulled out from the extraction groove (70) outward in the diameter direction of the yoke (24) from the insulator base (51) while being squeezed into the pair of extraction groove forming surfaces (71). In this way, the extraction groove (70) is secured by tightening the extraction line (35). Furthermore, the "circular shape of the extraction line (35)" refers to the shape of the extraction line (35) before it is squeezed into the pair of extraction groove forming surfaces (71) and crushed, and specifically refers to the shape of the extraction line (35) before it is secured by tightening the extraction groove (70). The width (H1) is the shortest distance between a pair of extraction groove forming surfaces (71), and in this embodiment, it is the distance between a pair of extraction groove forming surfaces (71) along a direction perpendicular to the diameter direction of the yoke (24).

[0041] <Return Home>

[0042] As shown in FIG. 4, the insulator base (51) of the second insulator (502) has a plurality of return grooves (80). The return grooves (80) are open at the end portion (51e) of the insulator. The return grooves (80) penetrate the insulator base (51) in the diameter direction of the yoke (24). The return grooves (80) have a first portion that opens to the inner surface (51a) of the insulator base (51) and a second portion that opens to the outer surface (51b) of the insulator base (51). Each return groove (80) is positioned at a location adjacent to each other in the circumferential direction of the insulator base (51) with respect to the corresponding withdrawal groove (70). And, each return groove (80) returns the lead line (35) drawn from the corresponding draw groove (70) from the second side in the radial direction to the first side in the insulator base (51). In this way, the return groove (80) returns the lead line (35) drawn from the draw groove (70) to the inner side in the radial direction of the yoke (24) rather than the insulator base (51).

[0043] As shown in FIG. 5, the return groove (80) has a pair of return groove forming surfaces (81) and a connecting surface (82). When the return groove (80) is viewed from the radial direction of the yoke (24), the pair of return groove forming surfaces (81) are extended parallel to each other as they extend from the insulator end (51e) in the axial direction of the yoke (24). The pair of return groove forming surfaces (81) are located on both sides in the circumferential direction of the yoke (24) with respect to the lead line (35). When the return groove (80) is viewed from the axial direction of the yoke (24), the pair of return groove forming surfaces (81) are in a straight line shape along the radial direction of the yoke (24), extending from the outer surface (51b) of the insulator base (51) toward the inner surface (51a). The connecting surface (82) connects the ends opposite to the insulator ends (51e) in the pair of return groove forming surfaces (81). When the return groove (80) is viewed from the diameter direction of the yoke (24), the connecting surface (82) extends in the circumferential direction of the yoke (24).

[0044] The length from the insulator end (51e) to the connection surface (82) in each return groove forming surface (81) is the same as the length from the insulator end (51e) to the connection surface (72) in each withdrawal groove forming surface (71). The connection surface (82) of each return groove (80) is adjacent to the connection surface (72) of the corresponding withdrawal groove (70) in the circumferential direction of the yoke (24).

[0045] The width (H2) between the pair of return groove forming surfaces (81) is larger than the circular outer diameter (D1) of the lead line (35). Therefore, when the lead line (35) passes between the pair of return groove forming surfaces (81), it is returned from the return groove (80) to the inner side of the yoke (24) in the diameter direction, rather than the insulator base (51), without being crushed by being inserted into the pair of return groove forming surfaces (81). In this way, the return groove (80) holds the lead line (35) in the gap. Additionally, the width (H2) is the shortest distance between the pair of return groove forming surfaces (81), and in this embodiment, it is the length between the pair of return groove forming surfaces (81) along a direction perpendicular to the diameter direction of the yoke (24).

[0046] <Protrusion>

[0047] As shown in FIG. 4, the insulator base (51) of the second insulator (502) has a plurality of protrusions (90). The protrusions (90) protrude from the area between the withdrawal groove (70) and the return groove (80) on the outer surface (51b) of the insulator base (51).

[0048] As shown in FIGS. 5 and 6, the projection (90) has a surface (91) on the opposite side of the insulator end (51e). The surface (91) extends in the diameter direction of the yoke (24) from the outer surface (51b) of the insulator base (51). The surface (91) has a flat surface shape. The surface (91) is positioned closer to the insulator end (51e) than the connection surface (72) of the withdrawal groove (70) and the connection surface (82) of the return groove (80).

[0049] The lead line (35) drawn out from the drawout groove (70) is connected to the connecting surface (91) of the projection (90) and extends toward the return groove (80). In this way, the lead line (35) drawn out from the drawout groove (70) is connected to a portion opposite to the insulator end (51e) in the projection (90).

[0050] [Operation of the first embodiment]

[0051] Next, the operation of the first embodiment is explained while describing the sequence of operations for binding and securing the lead wire (35) to the insulator (50).

[0052] As shown in FIG. 7, when the lead wire (35) is bundled and fixed to the insulator (50), the lead wire (35) is first drawn out from the lead groove (70) to the outer side of the yoke (24) in the diameter direction, rather than the base (51) of the insulator, so that the lead wire (35) passes through the lead groove (70). At this time, the lead groove (70) is secured by tightening the lead wire (35). Therefore, the lead wire (35) is prevented from slipping out of the lead groove (70).

[0053] As shown in FIG. 8, the lead line (35) drawn out from the lead groove (70) is subsequently bent in the circumferential direction of the yoke (24) toward the return groove (80). At this time, the lead line (35) is bent in the circumferential direction of the yoke (24) so ​​that the lead line (35) is attached to the attachment surface (91) of the projection (90).

[0054] As shown in FIG. 9, the lead line (35) is subsequently bent in the axial direction of the yoke (24) toward the insulator end (51e), starting from the portion connecting with the protrusion (90). At this time, the lead line (35) is bent until a portion of the part opposite to the lead groove (70) from the portion connecting with the protrusion (90) overlaps with the return groove (80) in the diameter direction of the yoke (24).

[0055] As shown in FIG. 10, the lead wire (35) is subsequently bent inward in the radial direction of the yoke (24) so ​​that the lead wire (35) passes through the return groove (80). At this time, the return groove (80) holds the lead wire (35) in place with a gap fit. Therefore, the lead wire (35) is made easy to pass through the inner side of the return groove (80). Furthermore, when the lead wire (35) is returned to the first side in the radial direction of the insulator base (51) through the return groove (80), interference with other lead wires (35) is easily avoided when pulling the lead wire (35) from the first side in the radial direction while avoiding interference with other lead wires (35) of the second coil end (282).

[0056] As shown in FIG. 5, the lead line (35), which is returned inward in the radial direction of the yoke (24) from the insulator base (51) through the return groove (80), is bent in the opposite direction to the lead groove (70) in the circumferential direction of the yoke (24) on the inner side of the insulator base (51). Accordingly, the lead line (35), which is returned inward in the radial direction of the yoke (24) from the insulator base (51) through the return groove (80), runs along the inner circumferential surface (51a) of the insulator base (51). Thus, the problem of the lead line (35) interfering with a member located outward in the radial direction of the yoke (24) from the insulator base (51) is avoided.

[0057] In this way, the lead wire (35) is fixed to the insulator (50). As the lead wire (35) is fixed to the insulator (50) in a tensioned state, it is fixed to the insulator (50).

[0058] The winding start portion of the coil (28) is fixed as the winding (31) is wound on the tooth (25). Therefore, the winding start portion of the winding portion (30) is prevented from becoming loose. In addition, the winding end portion of the winding portion (30) is prevented from becoming loose as the lead wire (35) is fixed to the insulator (50).

[0059] [Effect of the first embodiment]

[0060] In the first embodiment, the following effects can be obtained.

[0061] (1-1) Since the extraction groove (70) holds the extraction line (35) by tightening it, the binding fixation to the insulator (50) on the extraction line (35) is avoided. Additionally, since the return groove (80) holds the extraction line (35) by gap fitting it, the extraction line (35) drawn out from the extraction groove (70) to the second side in the diameter direction of the insulator base (51) can be easily returned to the first side in the diameter direction of the insulator base (51) through the return groove (80). Accordingly, when the lead wire (35) is returned to the first side in the radial direction of the insulator base (51) through the return groove (80), it is easy to avoid interference with other lead wires (35) when pulling the lead wire (35) to the first side in the radial direction of the insulator base (51) while avoiding interference with other lead wires (35) of the second coil end (282). Therefore, the operation of securing the insulator (50) in the lead wire (35) can be easily performed. By the above, the operation of securing the insulator (50) in the lead wire (35) can be easily performed while avoiding the instability of the securing the insulator (50) in the lead wire (35).

[0062] (1-2) Since the width (H2) between the pair of return groove forming surfaces (81) is larger than the circular outer diameter (D1) of the lead wire (35), the return groove (80) holds the lead wire (35) in a gap-fitting manner. Additionally, the pair of return groove forming surfaces (81) extend parallel to each other as they extend along the axial direction of the yoke (24) from the insulator end (51e). This configuration is suitable for the return groove (80) to hold the lead wire (35) in a gap-fitting manner.

[0063] (1-3) Since the width (H1) between a pair of pull-out groove forming surfaces (71) is smaller than the circular outer diameter (D1) of the pull-out line (35), the pull-out groove (70) is secured by tightening the pull-out line (35). Additionally, a pair of pull-out groove forming surfaces (71) extend from the insulator end (51e) in the axial direction of the yoke (24) and extend parallel to each other. This configuration is suitable for the pull-out groove (70) to secure the pull-out line (35) by tightening it.

[0064] (1-4) A lead line (35) drawn out from the lead groove (70) to the second side in the diameter direction of the insulator base (51) is attached to a portion opposite to the insulator end (51e) in the protrusion (90). Because of this, the binding fixation to the insulator (50) in the lead line (35) can be further stabilized.

[0065] (1-5) For example, consider the case where the insulator (50) has thermally expanded. In this case, even if the pull-out groove (70) is holding the pull-out wire (35) by tightening it, the return groove (80) is holding the pull-out wire (35) by gap fitting it, thereby relieving the stress acting on the pull-out wire (35) from the insulator (50). Therefore, since the durability of the pull-out wire (35) can be improved, the reliability of the stator (11) of the rotary electric (10) can be improved.

[0066] [Second Embodiment]

[0067] Hereinafter, a second embodiment of a stator for a rotating electric motor is described in accordance with FIGS. 11 and 12. In addition, in the embodiment described below, the same reference numerals are used for components identical to those in the first embodiment already described, and redundant descriptions thereof are omitted or simplified.

[0068] As shown in FIGS. 11 and 12, when the return groove (80) is viewed from the axial direction of the yoke (24), a pair of return groove forming surfaces (81) are inclined to gradually diverge from the withdrawal groove (70) as they move from the outer surface (51b) of the insulator base (51) toward the inner surface (51a). Each return groove forming surface (81) is arranged in a series parallel to each other. Each return groove forming surface (81) guides the withdrawal line (35) diverging from the withdrawal groove (70) toward the second side in the radial direction of the insulator base (51) when the withdrawal line (35) drawn from the withdrawal groove (70) toward the second side in the radial direction of the insulator base (51) is returned through the return groove (80) toward the first side in the radial direction of the insulator base (51).

[0069] As shown in FIG. 12, the width (H2) between a pair of return groove forming surfaces (81) is smaller than the outer diameter (D1) of the circular shape of the lead wire (35). Therefore, the return groove (80) is secured by tightening the lead wire (35). In addition, the "circular shape of the lead wire (35)" refers to the shape of the lead wire (35) before it is inserted into the pair of return groove forming surfaces (81) and crushed, and refers to the shape of the lead wire (35) before it is secured by tightening the lead wire (35) into the return groove (80). The width (H2) is the shortest distance between a pair of return groove forming surfaces (81), and in this embodiment, it is the length between a pair of return groove forming surfaces (81) along a direction that intersects the diameter direction of the yoke (24).

[0070] The width (H1) between a pair of extraction groove forming surfaces (71) is larger than the circular outer diameter (D1) of the extraction line (35). Therefore, the extraction groove (70) holds the extraction line (35) by fitting it in the gap.

[0071] [Effect of the second embodiment]

[0072] In the second embodiment, the following effects can be obtained.

[0073] (2-1) Since the width (H2) of the pair of return groove forming surfaces (81) is smaller than the circular outer diameter (D1) of the lead wire (35), the return groove (80) is secured by tightening the lead wire (35). Therefore, the binding fixation to the insulator (50) on the lead wire (35) is avoided. Additionally, when viewing the return groove (80) from the axial direction of the yoke (24), the pair of return groove forming surfaces (81) are in a sloping state that gradually separates from the lead groove (70) as they move from the outer surface (51b) of the insulator base (51) toward the inner surface (51a). Here, for example, consider a case where a pair of return groove forming surfaces (81) are connected from the outer surface (51b) of the insulator base (51) toward the inner surface (51a), maintaining the same distance from each of the draw-out grooves (70). In this case, the draw-out line (35) drawn from the draw-out groove (70) toward the second side in the diameter direction of the insulator base (51) can be easily returned to the first side in the diameter direction of the insulator base (51) through the return grooves (80). Accordingly, when the lead wire (35) is returned to the first side in the radial direction of the insulator base (51) through the return groove (80), it is easy to avoid interference with other lead wires (35) when pulling the lead wire (35) from the first side in the radial direction of the insulator base (51) while avoiding interference with other lead wires (35) of the second coil end (282). Therefore, the operation of binding and fixing the insulator (50) on the lead wire (35) can be easily performed. By the above, the operation of binding and fixing the insulator (50) on the lead wire (35) can be easily performed while avoiding the binding and fixing of the insulator (50) on the lead wire (35) becoming unstable.

[0074] (2-2) Since the width (H1) between a pair of pull-out groove forming surfaces (71) is larger than the circular outer diameter (D1) of the pull-out wire (35), the pull-out groove (70) holds the pull-out wire (35) by a gap fit. Here, for example, consider the case where the insulator (50) has thermally expanded. In this case, even if the return groove (80) holds the pull-out wire (35) by tightening it, the pull-out groove (70) holds the pull-out wire (35) by a gap fit, thereby relieving the stress acting on the pull-out wire (35) from the insulator (50). Therefore, since the durability of the pull-out wire (35) can be improved, the reliability of the stator (11) of the rotary electric (10) can be improved.

[0075] (2-3) When the return groove (80) is viewed from the axial direction of the yoke (24), a pair of return groove forming surfaces (81) are inclined to gradually separate from the drawer groove (70) as they move from the outer surface (51b) of the insulator base (51) toward the inner surface (51a). Therefore, when the drawer wire (35) is returned to the first side in the diameter direction of the insulator base (51) through the return groove (80), it is possible to place the winding equipment on the outer side in the diameter direction of the yoke (24) rather than the insulator base (51). Thus, for example, by placing the winding equipment on the inner side in the diameter direction of the yoke (24) rather than the insulator base (51), the problem of interference with the drawer wire (35) of the other phase coil (28) can be avoided.

[0076] [Change Example]

[0077] In addition, each of the above embodiments may be implemented with modifications as follows. Each of the above embodiments and the following modifications may be implemented in combination with one another to the extent that they are not technically contradictory.

[0078] ○ FIG. 13 shows a modified example of the first embodiment. As shown in FIG. 13, when the return groove (80) is viewed from the diameter direction of the yoke (24), the return groove forming surface (81) among the pair of return groove forming surfaces (81) that is positioned far from the withdrawal groove (70) is in a sloping state that gradually moves away from the withdrawal groove (70) as it approaches the insulator end (51e) from the connecting surface (82), which is the bottom surface of the return groove (80).

[0079] According to this, when the lead wire (35) drawn out from the lead groove (70) to the second side in the diameter direction of the insulator base (51) is returned to the first side in the diameter direction of the insulator base (51) through the return groove (80), it is possible to make it easier to pass the lead wire (35) into the inner side of the return groove (80). Therefore, the operation of binding and fixing the lead wire (35) to the insulator (50) can be performed more easily. In addition, when the lead wire (35) is returned to the first side in the diameter direction of the insulator base (51) through the return groove (80), it becomes possible to place the winding equipment on the outer side in the diameter direction of the yoke (24) rather than the insulator base (51). Therefore, for example, by placing the winding equipment on the inner side of the yoke (24) in the diameter direction rather than the insulator base (51), the problem of interference with the lead wire (35) of the other phase coil (28) can be avoided.

[0080] ○ FIG. 14 illustrates a modified example of the first embodiment. As shown in FIG. 14, when the return groove (80) is viewed from the axial direction of the yoke (24), a pair of return groove forming surfaces (81) are in a slanted state that gradually separates from the extraction groove (70) as they move from the outer surface (51b) of the insulator base (51) toward the inner surface (51a). The width (H2) between the pair of return groove forming surfaces (81) is larger than the circular outer diameter (D1) of the extraction line (35).

[0081] According to this, the return groove (80) holds the lead line (35) in place by a gap fitting. And, when viewing the return groove (80) from the axial direction of the yoke (24), a pair of return groove forming surfaces (81) are in a slanted state that gradually separates from the lead groove (70) as they move from the outer surface (51b) of the insulator base (51) toward the inner surface (51a). Here, for example, consider the case where a pair of return groove forming surfaces (81) are connected from the outer surface (51b) of the insulator base (51) toward the inner surface (51a), each maintaining the same distance from the lead groove (70). Compared to this case, the lead line (35) drawn out from the lead groove (70) to the second side in the diameter direction of the insulator base (51) can be easily returned to the first side in the diameter direction of the insulator base (51) through the return groove (80). Accordingly, the operation of binding and fixing the insulator (50) on the lead line (35) can be performed more easily.

[0082] ○ In the second embodiment, the width (H1) of a pair of extraction groove forming surfaces (71) may be smaller than the circular outer diameter (D1) of the extraction line (35). In the second embodiment, the extraction groove (70) may be secured by tightening the extraction line (35).

[0083] ○ In each of the above embodiments, the insulator base (51) may not have a protrusion (90).

[0084] ○ In each of the above embodiments, the lead wires (35) of the end of winding drawn from the winding unit (30) form a neutral point by being electrically connected to each other, but are not limited thereto. For example, the lead wires (35) of the end of winding drawn from the winding unit (30) may be electrically connected to an external power source through a connection terminal housed within the cluster block (40). In this case, a part of the winding at the start of winding drawn from the winding unit (30) forms a neutral point by being electrically connected to each other.

[0085] ○ In each of the above embodiments, the rotor (12) is configured to be positioned inside the stator (11), but it may also be configured to have the stator (11) positioned inside the cylindrical rotor (12). In that case, the teeth (25) extend outward in the radial direction of the yoke (24) from the outer surface, which is the circumferential surface of the yoke (24). The teeth (25) may extend continuously from the circumferential surface of the yoke (24) in the radial direction of the yoke (24). And, when a stator (11) is positioned on the inner side of the rotor (12), the outer surface (51b) of the insulator base (51) is the first circumferential surface on the first side where the coil end is located in the diameter direction of the yoke (24) (insulator base (51)), and the inner surface (51a) of the insulator base (51) is the second circumferential surface on the second side opposite to the first side in the diameter direction of the yoke (24) (insulator base (51)).

[0086] ○ In each of the above embodiments, the winding work for the tooth joint (26) in the winding (31) of each coil (28) and the insulator joint (53) of the two insulators (50) may be performed manually.

Claims

Claim 1 A rotary electric stator comprising: a cylindrical yoke; a stator core having a plurality of teeth extending in the radial direction of the yoke from the circumferential surface of the yoke; a coil formed by winding a coil on each of the teeth, wherein the coil includes a coil end protruding from a core cross section located in the axial direction of the yoke in the stator core; and an insulator disposed opposite to the core cross section and insulating between the coil end and the core cross section, wherein the coil has a winding portion formed by winding the coil in a concentrated winding on the teeth, and a winding end lead wire which is a part of the winding drawn out from the winding portion; and the insulator has a cylindrical insulator base disposed at a position overlapping in the axial direction with respect to the yoke, wherein the insulator base has a first circumferential surface on the first side where the coil end is located in the radial direction, and a portion opposite to the first side in the radial direction A second circumferential surface on the second side, an insulator end that is the end opposite to the stator core in the insulator base, and a pull-out groove that opens at the insulator end, wherein the pull-out groove has a first end that opens at the first circumferential surface and a second end that opens at the second circumferential surface, and pulls the pull-out line from the first side in the radial direction to the second side, and a return groove that opens at the insulator end, wherein the return groove has a first end that opens at the first circumferential surface and a second end that opens at the second circumferential surface, and the return groove has a return groove that is positioned adjacent to each other in the circumferential direction of the insulator base with respect to the pull-out groove and returns the pull-out line pulled from the pull-out groove from the second side in the radial direction to the first side, and the pull-out groove tightens the pull-out line A stator of rotary electricity that holds and holds, and the above return groove holds the above lead wire by gap fitting. Claim 2 A stator of a rotary electric motor according to claim 1, wherein the return groove has a pair of return groove forming surfaces located on both sides in the circumferential direction with respect to the lead wire, the pair of return groove forming surfaces extend parallel to each other along the axial direction from the end of the insulator, and the width between the pair of return groove forming surfaces is larger than the outer diameter of the original shape of the lead wire. Claim 3 A stator of a rotary electric motor according to claim 1, wherein the return groove has a pair of return groove forming surfaces located on both sides in the circumferential direction with respect to the lead line, and among the pair of return groove forming surfaces, the return groove forming surface positioned far from the lead groove is in a slanted state that gradually separates from the lead groove as it approaches the end of the insulator. Claim 4 A stator of a rotary electric motor according to claim 1, wherein the return groove has a pair of return groove forming surfaces located on both sides in the circumferential direction with respect to the lead line, and when viewed from the axial direction, the pair of return groove forming surfaces are inclined to gradually separate from the lead groove as they move from the second circumferential surface toward the first circumferential surface, and the width between the pair of return groove forming surfaces is larger than the circular outer diameter of the lead line. Claim 5 A stator of a rotary electric motor according to any one of claims 1 to 4, wherein the draw-out groove has a pair of draw-out groove forming surfaces located on both sides in the circumferential direction with respect to the draw-out line, the pair of draw-out groove forming surfaces extend parallel to each other along the axial direction from the end of the insulator, and the width between the pair of draw-out groove forming surfaces is smaller than the circular outer diameter of the draw-out line. Claim 6 A stator of rotary electricity comprising: a cylindrical yoke; a stator core having a plurality of teeth extending in the radial direction from the circumferential surface of the yoke; a coil formed by winding a coil on each of the teeth, wherein the coil includes a coil end protruding from a core cross section located in the axial direction of the yoke in the stator core; and an insulator disposed opposite to the core cross section and insulating between the coil end and the core cross section, wherein the coil has a winding portion formed by winding the coil in a concentrated winding on the teeth, and a winding end lead wire which is a part of the winding drawn out from the winding portion; and the insulator has a cylindrical insulator base disposed at a position overlapping in the axial direction with respect to the yoke, wherein the insulator base has a first circumferential surface on a first side where the coil end is located in the radial direction, and a side opposite to the first side in the radial direction A second circumferential surface on the second side, an insulator end opposite to the stator core in the insulator base, and a pull-out groove opening in the insulator end, wherein the pull-out groove has a first end opening in the first circumferential surface and a second end opening in the second circumferential surface, and pulls the pull-out line from the first side in the radial direction to the second side, and a return groove opening in the insulator end, wherein the return groove has a first end opening in the first circumferential surface and a second end opening in the second circumferential surface, and is positioned adjacent to each other in the circumferential direction of the insulator base with respect to the pull-out groove, and returns the pull-out line pulled from the pull-out groove from the second side in the radial direction to the first side, and the return groove has a pair of positions located on both sides in the circumferential direction with respect to the pull-out line. Having a return groove forming surface, and when the return groove is viewed from the axial direction, the pair of return groove forming surfaces,A stator of rotary electricity, having an inclined state that gradually separates from the drawing groove as it extends from the second circumferential surface toward the first circumferential surface, and the width between the pair of return groove forming surfaces is smaller than the circular outer diameter of the drawing line. Claim 7 In claim 6, the above-mentioned extraction groove has a pair of extraction groove forming surfaces located on both sides in the circumferential direction with respect to the extraction line, and the width between the pair of extraction groove forming surfaces is larger than the circular outer diameter of the extraction line, a stator of rotary electric power. Claim 8 A rotary electric stator according to claim 1 or 6, wherein the insulator base has a projection protruding from a portion between the withdrawal groove and the return groove on the second circumferential surface, and the withdrawal line drawn from the withdrawal groove is attached to a portion opposite to the insulator end on the projection.

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