Stator, rotating electrical machine, and electric vehicle

Abstract

The present invention provides a stator, a rotating electrical machine, and an electric vehicle, which achieve miniaturization of a busbar unit. The stator comprises: a U-phase winding Cu, which has a power point Pu and a neutral point Nu protruding from a stator core (15); a V-phase winding Cv, which has a power point Pv and a neutral point Nv protruding from the stator core; a W-phase winding Cw, which has a power point Pw and a neutral point Nw protruding from the stator core, and a busbar unit (20) comprising: a first power busbar (21) connected to the power point Pu; a second power busbar (22) connected to the power point P v; a third power bus (23) connected to the power point Pw; a neutral bus (24) connected to the neutral points Nu, Nv, and Nw, wherein in the circumferential direction (D1) of the stator core (15), the neutral point Nw of the W-phase winding Cw is arranged between the power point Pu of the U-phase winding Cu and the power point Pv of the V-phase winding Cv, and the power point Pw of the W-phase winding Cw is arranged between the neutral point Nu of the U-phase winding Cu and the neutral point Nv of the V-phase winding Cv.

Description

Technical Field

[0001] The present invention relates to a stator provided in a rotating electric machine, the rotating electric machine, and an electric vehicle. Background Art

[0002] A rotating electrical machine such as a motor or a generator includes a stator wound with a stator winding. As such a stator winding, a stator winding including a plurality of segment coils bent into a substantially U-shape has been proposed (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-81351 Summary of the Invention

[0006] Technical issues

[0007] A busbar unit, consisting of multiple busbars, is connected to the stator windings. The busbar unit also includes busbars that connect the neutral points of the stator windings to each other and to the power lines from the inverter. To miniaturize the stator equipped with this busbar unit, the busbar unit itself is also required to be miniaturized.

[0008] An object of the present invention is to achieve miniaturization of a busbar unit.

[0009] Technical Solution

[0010] The stator of the present invention is provided in a rotating electric machine, and the stator comprises: a cylindrical stator core formed with a plurality of slots; a first phase winding comprising a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end face of the stator core; a second phase winding comprising a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end face of the stator core; a third phase winding comprising a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end face of the stator core; and a busbar unit comprising: a first power busbar; A line connected to the power point of the first phase winding; a second power bus connected to the power point of the second phase winding; a third power bus connected to the power point of the third phase winding; and a neutral bus connected to the neutral points of the first phase winding, the second phase winding and the third phase winding. In the circumferential direction of the stator core, the neutral point of the third phase winding is arranged between the power point of the first phase winding and the power point of the second phase winding, and the power point of the third phase winding is arranged between the neutral point of the first phase winding and the neutral point of the second phase winding.

[0011] Technical Effects

[0012] According to the present invention, the neutral point of the third-phase winding is positioned between the power points of the first-phase winding and the second-phase winding in the circumferential direction of the stator core, and the power point of the third-phase winding is positioned between the neutral points of the first-phase winding and the second-phase winding. This allows for a more compact busbar unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view showing an example of a rotating electrical machine including a stator according to one embodiment of the present invention.

[0014] Figure 2 It is along Figure 1 The AA line represents a cross-sectional view of the stator.

[0015] Figure 3 It is a cross-sectional view showing a stator core including a U-phase winding.

[0016] Figure 4 It is a cross-sectional view showing a stator core including a V-phase winding.

[0017] Figure 5 It is a cross-sectional view showing a stator core including a W-phase winding.

[0018] Figure 6 It is a perspective view showing an example of a segment coil.

[0019] Figure 7 It is a perspective view showing a stator.

[0020] Figure 8 (A) and (B) are diagrams showing an example of the connection state of the segment coil.

[0021] Figure 9 This is a diagram showing an example of the connection state of the stator winding.

[0022] Figure 10 This is a diagram showing an example of the winding structure of the U-phase winding.

[0023] Figure 11 It is a diagram showing the storage positions of the segment coils constituting the U-phase winding with respect to the slots.

[0024] Figure 12 It is a diagram showing the storage positions of the segment coils constituting the U-phase winding with respect to the slots.

[0025] Figure 13 This is a diagram showing an example of the winding structure of the V-phase winding.

[0026] Figure 14 This is a diagram showing the storage positions of the segment coils constituting the V-phase winding in the slots.

[0027] Figure 15 This is a diagram showing the storage positions of the segment coils constituting the V-phase winding in the slots.

[0028] Figure 16 This is a diagram showing an example of the winding structure of the W-phase winding.

[0029] Figure 17 1 is a diagram showing the storage positions of the segment coils constituting the W-phase winding with respect to the slots.

[0030] Figure 18 1 is a diagram showing the storage positions of the segment coils constituting the W-phase winding with respect to the slots.

[0031] Figure 19 This is a perspective view showing the internal structure of the busbar unit.

[0032] Figure 20 This is a side view showing the internal structure of the busbar unit.

[0033] Figure 21 This is a diagram that simply shows the connection structure of the busbar unit.

[0034] Figure 22 It is a side view showing the internal structure of a busbar unit provided in a stator according to a comparative example.

[0035] Figure 23 This is a diagram simply showing a connection structure of a busbar unit provided in a stator according to a comparative example.

[0036] Explanation of symbols

[0037] 10 stator

[0038] 11 Rotating motor

[0039] 15 stator core

[0040] 20 busbar units

[0041] 21 First power bus

[0042] 22 Second power bus

[0043] 23 Third power bus

[0044] 24 Neutral bus

[0045] 25 Insulation parts

[0046] 40 Segmented coil (segmented conductor)

[0047] 50 one end face (end face)

[0048] S1 to S48 slots

[0049] u1~u64 Segmented coil (segmented conductor)

[0050] v1~v64 Segmented coil (segmented conductor)

[0051] w1~w64 Segmented coil (segmented conductor)

[0052] Cu U-phase winding (first phase winding)

[0053] Cv V-phase winding (second phase winding)

[0054] Cw W-phase winding (third-phase winding)

[0055] Pu, Pv, Pw power points

[0056] Nu, Nv, Nw neutral point

[0057] D1 Circumferential direction

[0058] D2 Radial

[0059] G1 First connection point group

[0060] G2 Second connection point group DETAILED DESCRIPTION

[0061] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, a three-phase AC synchronous motor generator such as that installed in an electric vehicle and / or hybrid vehicle is used as an example of a rotating electrical machine 11 including a stator 10 according to one embodiment of the present invention. However, the present invention is not limited to this embodiment and any rotating electrical machine may be used as long as it includes a stator incorporating a segment coil 40.

[0062] [Rotating Electric Machine Structure]

[0063] Figure 1 1 is a cross-sectional view showing an example of a rotating electrical machine 11 including a stator 10 according to an embodiment of the present invention. Figure 1 As shown, a rotating electrical machine 11 serving as a motor generator includes a motor housing 12. The motor housing 12 comprises a cylindrical housing body 13 with a bottom, and an end cover 14 that closes the open end of the housing body 13. The stator 10 includes a cylindrical stator core 15 and a three-phase stator winding SC. The stator 10 is fixed within the housing body 13. The stator core 15 is made of a plurality of silicon steel plates, etc., and the three-phase stator winding SC is wound around the stator core 15.

[0064] The stator winding SC has its winding ends connected to a busbar unit 20, described later. This busbar unit 20 includes three power busbars 21-23 connected to the three power points Pu, Pv, and Pw provided in the stator winding SC; a neutral busbar 24 interconnecting the three neutral points Nu, Nv, and Nw provided in the stator winding SC; and an insulating member 25 that holds these busbars 21-24 together. The ends of the power busbars 21-23 protrude from the motor housing 12, and cables 27 extending from, for example, an inverter 26 are connected to each power busbar 21-23.

[0065] A cylindrical rotor 30 is rotatably housed in the center of the stator core 15. Rotor 30 comprises a cylindrical rotor core 31 formed from multiple silicon steel plates, a plurality of permanent magnets 32 embedded within rotor core 31, and a rotor shaft 33 fixed to the center of rotor core 31. One end of rotor shaft 33 is supported by a bearing 34 mounted on the housing body 13, while the other end is supported by a bearing 35 mounted on the end cover 14.

[0066] [Stator structure]

[0067] Figure 2 It is along Figure 1 The cross-sectional view of the stator 10 is shown along the AA line. Figure 3 1 is a cross-sectional view showing a stator core 15 having a U-phase winding (hereinafter referred to as a U-phase winding Cu). Figure 4 1 is a cross-sectional view showing a stator core 15 having a V-phase winding (hereinafter referred to as a V-phase winding Cv). Figure 5 : is a cross-sectional view showing a stator core 15 having a W-phase winding (hereinafter referred to as a W-phase winding Cw). Figure 6 1 is a perspective view showing an example of the segment coil 40. The U-phase winding Cu, the V-phase winding Cv, and the W-phase winding Cw are phase windings of the respective phases (U-phase, V-phase, W-phase) constituting the stator winding SC.

[0068] like Figure 2 As shown, slots S1 to S48 are formed at predetermined intervals along the circumferential direction on the inner periphery of the cylindrical stator core 15. Segment coils (segment conductors) 40 described later are housed in each slot S1 to S48, and a plurality of segment coils 40 are connected to form a stator winding SC. Figures 3 to 5 As shown, the segment coils 40 constituting the U-phase winding Cu are housed in slots S1, S2, S7, S8, ..., the segment coils 40 constituting the V-phase winding Cv are housed in slots S5, S6, S11, S12, ..., and the segment coils 40 constituting the W-phase winding Cw are housed in slots S3, S4, S9, S10, ...

[0069] like Figure 6 As shown, the segmented coil 40 bent into a roughly U-shape has: a coil side portion 41, which is housed in a certain slot (for example, slot S1); and a coil side portion 42, which is housed in another slot (for example, slot S7) at a predetermined coil pitch. In addition, the segmented coil 40 has: a bent portion 43, which connects a pair of coil side portions 41 and 42 to each other; and welded ends 44 and 45, which extend from each of the pair of coil side portions 41 and 42. It should be noted that the segmented coil 40 includes a flat wire containing a conductive material such as copper, and in the segmented coil 40, except for the front ends of the welded ends 44 and 45, an insulating coating such as enamel or resin coating is provided. In addition, the bent portion 43 of the segmented coil 40 is not limited to Figure 6 The bent shape shown in FIG. 1 is different from the bent shape shown in FIG. 1 , and the stator core 15 is bent into various shapes depending on the assembly position thereof.

[0070] Here, Figure 7 is a perspective view showing the stator 10. Figure 8 (A) and (B) are diagrams showing an example of the connection state of the segment coil 40. Figure 2 and Figure 7 As shown, a plurality of segment coils 40 are assembled in each slot S1 to S48 of the stator core 15. Figure 7 and Figure 8 As shown, when segment coil 40 is assembled to stator core 15 , welded ends 44 , 45 of segment coil 40 protrude from one end surface (end surface) 50 of stator core 15 , and bent portion 43 of segment coil 40 protrudes from the other end surface 51 of stator core 15 .

[0071] And, as Figure 8 As shown in (A) and (B) of FIG5 , welded ends 44 and 45 protruding from one end surface 50 of stator core 15 are bent so as to contact welded ends 44 and 45 of other segment coils 40, and then welded to the welded ends 44 and 45 of the other segment coils 40 in contact. This connects multiple segment coils 40 to form a single conductor that constitutes each phase winding Cu, Cv, and Cw. Specifically, U-phase winding Cu includes multiple segment coils 40, V-phase winding Cv includes multiple segment coils 40, and W-phase winding Cw includes multiple segment coils 40. The welded welded ends 44 and 45 are then subjected to an insulating coating, such as a resin coating, to cover the conductors.

[0072] [Stator winding structure]

[0073] Figure 9This diagram shows an example of the connection state of the stator winding SC. It should be noted that, while the segment coils are denoted by the symbol "40" in the above description, the segment coils are denoted by the symbols "u1 to u64, v1 to v64, and w1 to w64" in the following description to distinguish the individual segment coils.

[0074] like Figure 9 As shown, the stator winding SC includes a U-phase winding Cu, a V-phase winding Cv, and a W-phase winding Cw. The U-phase winding Cu includes multiple segment coils u1 to u64 connected in series. One end of the U-phase winding Cu serves as the power point Pu, and the other end of the U-phase winding Cu serves as the neutral point Nu. Furthermore, the V-phase winding Cv includes multiple segment coils v1 to v64 connected in series. One end of the V-phase winding Cv serves as the power point Pv, and the other end of the V-phase winding Cv serves as the neutral point Nv. Furthermore, the W-phase winding Cw includes multiple segment coils w1 to w64 connected in series. One end of the W-phase winding Cw serves as the power point Pw, and the other end of the W-phase winding Cw serves as the neutral point Nw. Furthermore, the neutral point Nu of the U-phase winding Cu, the neutral point Nv of the V-phase winding Cv, and the neutral point Nw of the W-phase winding Cw are connected to each other, and the stator winding SC includes the phase windings Cu, Cv, and Cw.

[0075] [U-phase winding structure]

[0076] The structure of the U-phase winding Cu will be described in detail. Figure 10 is a diagram showing an example of the winding structure of the U-phase winding Cu. Figure 10 The slot numbers in the table represent the slots that accommodate the segment coils u1 to u64. Figure 11 and Figure 12 1 is a diagram showing the storage positions of the segment coils u1 to u64 constituting the U-phase winding Cu in the slots S1 , S2 , S7 , S8 . . . Figure 11 The middle shows the storage position of the segment coils u1 to u32. Figure 12 The middle shows the storage position of the segment coils u33 to u64.

[0077] Figure 11 and Figure 12 The "power line side" shown is Figure 1 and Figure 7 As shown, the side where the welded ends 44 and 45 of the segment coil 40 are located is the side where the busbar unit 20 is located. Figure 11 and Figure 12 The "reverse power line side" shown in Figure 1 and Figure 7 As shown, it is the side opposite to the power line side, that is, the side where the bent portion 43 of the segment coil 40 is located. Figure 11and Figure 12 The "inside" shown, as Figure 3 As shown, it is the radial inner side of the stator core 15, Figure 11 and Figure 12 The "outside" shown is the radial outside of the stator core 15. Figure 11 and Figure 12 The hatched positions in the figure are the welding positions of the segment coils u1 to u64.

[0078] like Figure 10 As shown, the U-phase winding Cu has a winding structure with a connection pattern of 8 segment coils (e.g., u1 to u8, u9 to u16, u17 to u24, ...) repeated. Figure 10 The connection pattern of the segment coils u1 to u8 shown by the symbol X1 will be described.

[0079] like Figure 11 As indicated by symbol X1, segment coil u1 is housed at the first position (outer position) of slots S1 and S43, segment coil u2 is housed at the second position of slot S1 and the third position of slot S43. Furthermore, segment coil u3 is housed at the fourth position of slot S1 and the fifth position of slot S43, segment coil u4 is housed at the sixth position of slot S1 and the seventh position of slot S43, and segment coil u5 is housed at the eighth position of slots S1 and S43. Furthermore, segment coil u6 is housed at the seventh position of slot S37 and the sixth position of slot S43, segment coil u7 is housed at the fifth position of slot S37 and the fourth position of slot S43, and segment coil u8 is housed at the third position of slot S37 and the second position of slot S43.

[0080] Furthermore, between slots S1 and S43 on the power line side, segment coil u1 from slot S43 is welded to segment coil u2 from slot S1, and segment coil u2 from slot S43 is welded to segment coil u3 from slot S1. Furthermore, segment coil u3 from slot S43 is welded to segment coil u4 from slot S1, and segment coil u4 from slot S43 is welded to segment coil u5 from slot S1. Furthermore, between slots S37 and S43 on the power line side, segment coil u5 from slot S43 is welded to segment coil u6 from slot S37, segment coil u6 from slot S43 is welded to segment coil u7 from slot S37, and segment coil u7 from slot S43 is welded to segment coil u8 from slot S37.

[0081] By repeating this connection pattern, the segment coils u1 to u64 are connected, as shown in FIG. Figures 10 to 12 As shown in FIG. 1 , the segment coils u1 to u64 constitute the U-phase winding Cu. The segment coils u1 to u64 constituted in this way are as shown in FIG. Figure 10 As shown, the winding starts from between slot S1 and slot S43, passes between slot S25 and slot S19, and reaches between slot S7 and slot S1. Then, it passes between slot S2 and slot S44, passes between slot S26 and slot S20, and reaches between slot S8 and slot S2. Figure 3 As shown, the U-phase winding Cu is wound twice around the stator core 15 while advancing in one direction (the direction of arrow α) of the circumferential direction of the stator core 15 from the power point Pu to the neutral point Nu. Figure 3 、 Figure 11 as well as Figure 12 As shown, the power point Pu of the U-phase winding Cu extends from the first position of the slot S1 , and the neutral point Nu of the U-phase winding Cu extends from the second position of the slot S8 .

[0082] [V-phase winding structure]

[0083] The structure of the V-phase winding Cv will be described in detail. Figure 13 : is a diagram showing an example of the winding structure of the V-phase winding Cv. Figure 13 The slot numbers in the table represent the slots that accommodate the segment coils v1 to v64. Figure 14 and Figure 15 1 and 2 are diagrams showing the storage positions of the segment coils v1 to v64 constituting the V-phase winding Cv in the slots S5 , S6 , S11 , S12 . . . Figure 14 The middle shows the storage position of segment coils v1 to v32. Figure 15 The middle shows the storage positions of the segment coils v33 to v64.

[0084] Figure 14 and Figure 15 The "power line side" shown is Figure 1 and Figure 7 As shown, the side where the welded ends 44 and 45 of the segment coil 40 are located is the side where the busbar unit 20 is located. Figure 14 and Figure 15 The "reverse power line side" shown in Figure 1 and Figure 7 As shown, it is the side opposite to the power line side, that is, the side where the bent portion 43 of the segment coil 40 is located. Figure 14 and Figure 15 The "inside" shown, as Figure 3 As shown, it is the radial inner side of the stator core 15, Figure 14 and Figure 15 The "outside" shown is the radial outside of the stator core 15. Figure 14 and Figure 15 The hatched positions in the figure are the welding positions of the segment coils v1 to v64.

[0085] like Figure 13 As shown, the V-phase winding Cv has a winding structure with a connection pattern of 8 segment coils (e.g., v1 to v8, v9 to v16, v17 to v24, ...) repeated. Figure 13 The connection pattern of the segment coils v1 to v8 shown by the symbol X2 will be described.

[0086] like Figure 14 As indicated by symbol X2, segment coil v1 is housed in the first position of slots S5 and S47, segment coil v2 is housed in the second position of slot S5 and the third position of slot S47. Furthermore, segment coil v3 is housed in the fourth position of slot S5 and the fifth position of slot S47, segment coil v4 is housed in the sixth position of slot S5 and the seventh position of slot S47, and segment coil v5 is housed in the eighth position of slots S5 and S47. Furthermore, segment coil v6 is housed in the seventh position of slot S41 and the sixth position of slot S47, segment coil v7 is housed in the fifth position of slot S41 and the fourth position of slot S47, and segment coil v8 is housed in the third position of slot S41 and the second position of slot S47.

[0087] Furthermore, between slots S5 and S47 on the power line side, the segment coil v1 from slot S47 and the segment coil v2 from slot S5 are fused together, and the segment coil v2 from slot S47 and the segment coil v3 from slot S5 are fused together. Furthermore, the segment coil v3 from slot S47 and the segment coil v4 from slot S5 are fused together, and the segment coil v4 from slot S47 and the segment coil v5 from slot S5 are fused together. Furthermore, between slots S41 and S47 on the power line side, the segment coil v5 from slot S47 and the segment coil v6 from slot S41 are fused together, the segment coil v6 from slot S47 and the segment coil v7 from slot S41 are fused together, and the segment coil v7 from slot S47 and the segment coil v8 from slot S41 are fused together.

[0088] By repeating this connection pattern, the segmented coils v1 to v64 are connected, as shown in Figures 13 to 15 As shown in FIG. 1 , the segment coils v1 to v64 constitute the V-phase winding Cv. The segment coils v1 to v64 constituted in this manner are as shown in FIG. Figure 13 As shown, the winding starts from between slot S5 and slot S47, passes between slot S29 and slot S23, and reaches between slot S11 and slot S5. Then, it passes between slot S6 and slot S48, passes between slot S30 and slot S24, and reaches between slot S12 and slot S6. Figure 4 As shown, the V-phase winding Cv goes from the power point Pv to the neutral point Nv, while advancing in one direction (the direction of the arrow α) of the circumferential direction of the stator core 15 and winding two turns on the stator core 15. Figure 4 、 Figure 14 as well as Figure 15 As shown, the power point Pv of the V-phase winding Cv extends from the first position of the slot S5, and the neutral point Nv of the V-phase winding Cv extends from the second position of the slot S12.

[0089] [W-phase winding structure]

[0090] The structure of the W-phase winding Cw will be described in detail. Figure 16 1 is a diagram showing an example of the winding structure of the W-phase winding Cw. Figure 16 The slot numbers in the table represent the slots that accommodate the segment coils w1 to w64. Figure 17 and Figure 18 1 and 2 are diagrams showing the storage positions of the segment coils w1 to w64 constituting the W-phase winding Cw in the slots S3 , S4 , S9 , S10 . . . Figure 17 The middle shows the storage position of the segment coils w33 to w64. Figure 18 The middle shows the storage positions of the segment coils w1 to w32.

[0091] Figure 17 and Figure 18 The "power line side" shown is Figure 1 and Figure 7 As shown, the side where the welded ends 44 and 45 of the segment coil 40 are located is the side where the busbar unit 20 is located. Figure 17 and Figure 18 The "reverse power line side" shown in Figure 1 and Figure 7 As shown, it is the side opposite to the power line side, that is, the side where the bent portion 43 of the segment coil 40 is located. Figure 17 and Figure 18 The "inside" shown, as Figure 3 As shown, it is the radial inner side of the stator core 15, Figure 17 and Figure 18 The "outside" shown is the radial outside of the stator core 15. Figure 17 and Figure 18 The hatched positions in the figure are the welding positions of the segment coils w1 to w64.

[0092] like Figure 16 As shown, the W-phase winding Cw has a winding structure with a connection pattern of 8 segment coils (e.g., w1 to w8, w9 to w16, w17 to w24, ...) repeated. Figure 16 The connection pattern of the segment coils w1 to w8 shown by the symbol X3 will be described.

[0093] like Figure 18As indicated by symbol X3, segment coil w1 is housed at the second position of slot S10 and the third position of slot S4, segment coil w2 is housed at the fourth position of slot S10 and the fifth position of slot S4, and segment coil w3 is housed at the sixth position of slot S10 and the seventh position of slot S4. Furthermore, segment coil w4 is housed at the eighth position of slots S10 and S16, and segment coil w5 is housed at the seventh position of slot S10 and the sixth position of slot S16. Furthermore, segment coil w6 is housed at the fifth position of slot S10 and the fourth position of slot S16, segment coil w7 is housed at the third position of slot S10 and the second position of slot S16, and segment coil w8 is housed at the first position of slots S10 and S16.

[0094] Furthermore, between slots S4 and S10 on the power line side, the segment coil w1 from slot S4 is welded to the segment coil w2 from slot S10, the segment coil w2 from slot S4 is welded to the segment coil w3 from slot S10, and the segment coil w3 from slot S4 is welded to the segment coil w4 from slot S10. Furthermore, between slots S16 and S10 on the power line side, the segment coil w4 from slot S16 is welded to the segment coil w5 from slot S10, and the segment coil w5 from slot S16 is welded to the segment coil w6 from slot S10. Furthermore, the segment coil w6 from slot S16 is welded to the segment coil w7 from slot S10, and the segment coil w7 from slot S16 is welded to the segment coil w8 from slot S10.

[0095] By repeating this connection pattern, the segment coils w1 to w64 are connected, as shown in FIG. Figures 16 to 18 As shown in FIG. 1 , the segment coils w1 to w64 constitute the W-phase winding Cw. The segment coils w1 to w64 constituted in this manner are as shown in FIG. Figure 16 As shown, the winding starts from between slot S4 and slot S10, passes between slot S28 and slot S34, and reaches between slot S46 and slot S4. Then, it passes between slot S3 and slot S9, passes between slot S27 and slot S33, and reaches between slot S45 and slot S3. Figure 5 As shown, the W-phase winding Cw is wound twice around the stator core 15 while traveling in the other direction (the direction of the arrow β) of the circumferential direction of the stator core 15 from the power point Pw to the neutral point Nw. That is, in the circumferential direction of the stator core 15, the W-phase winding Cw is wound around the stator core 15 in the opposite direction to the U-phase winding Cu or the V-phase winding Cv mentioned above. Figure 5 、 Figure 17 as well as Figure 18 As shown, the power point Pw of the W-phase winding Cw extends from the second position of the slot S10, and the neutral point Nw of the W-phase winding Cw extends from the first position of the slot S3.

[0096] [Busbar unit structure]

[0097] Next, the busbar unit 20 connected to the stator winding SC will be described. Figure 19 is a perspective view showing the internal structure of the busbar unit 20, Figure 20 2 is a side view showing the internal structure of the busbar unit 20. Figure 21 It is a diagram simply showing the connection structure of the bus bar unit 20 .

[0098] like Figure 19 and Figure 20 As shown, the busbar unit 20 includes four busbars 21 to 24 made of a metal material such as copper, and an insulating member 25 that holds these busbars 21 to 24. The busbars 21 to 23 incorporated into the busbar unit 20 include a first power busbar 21 connected to the power point Pu of the U-phase winding (first-phase winding) Cu; a second power busbar 22 connected to the power point Pv of the V-phase winding (second-phase winding) Cv; and a third power busbar 23 connected to the power point Pw of the W-phase winding (third-phase winding) Cw. Furthermore, the busbars 24 incorporated into the busbar unit 20 include a neutral busbar 24 connected to the neutral point Nu of the U-phase winding Cu, the neutral point Nv of the V-phase winding Cv, and the neutral point Nw of the W-phase winding Cw. It should be noted that the insulating member 25 of the busbar unit 20 is formed using an insulating resin such as polyethylene.

[0099] Here, as previously described, the power point Pu of the U-phase winding Cu extends from slot S1, and the neutral point Nu of the U-phase winding Cu extends from slot S8. Furthermore, the power point Pv of the V-phase winding Cv extends from slot S5, and the neutral point Nv of the V-phase winding Cv extends from slot S12. Furthermore, the power point Pw of the W-phase winding Cw extends from slot S10, and the neutral point Nw of the W-phase winding Cw extends from slot S3. That is, Figure 21 As shown, in the circumferential direction D1 of the stator core 15, the neutral point Nw of the W-phase winding Cw is positioned between the power point Pu of the U-phase winding Cu and the power point Pv of the V-phase winding Cv. Furthermore, in the circumferential direction D1 of the stator core 15, the power point Pw of the W-phase winding Cw is positioned between the neutral point Nu of the U-phase winding Cu and the neutral point Nv of the V-phase winding Cv. Thus, by positioning the power point Pw between the neutral point Nu and the neutral point Nv, and by positioning the neutral point Nw between the power points Pu and Pv, the power points Pu, Pv, and Pw, as well as the neutral points Nu, Nv, and Nw, can be brought closer together, enabling a more compact busbar unit 20.

[0100] That is, Figure 21As shown, the U-phase winding Cu, which winds from slot S1 to slot S8, is wound around stator core 15 while advancing in one direction (direction of arrow α) of the circumference of stator core 15. Furthermore, the V-phase winding Cv, which winds from slot S5 to slot S12, is wound around stator core 15 while advancing in one direction (direction of arrow α) of the circumference of stator core 15. Conversely, the W-phase winding Cw, which winds from slot S10 to slot S3, is wound around stator core 15 while advancing in the other direction (direction of arrow β) of the circumference of stator core 15. By winding the W-phase winding Cw around stator core 15 in the opposite direction relative to the U-phase winding Cu and / or the V-phase winding Cv, it is possible to position the power point Pw between neutral point Nu and neutral point Nv, and to position the neutral point Nw between power point Pu and power point Pv. Thus, the power points Pu, Pv, and Pw and the neutral points Nu, Nv, and Nw can be brought closer to each other, and the busbar unit 20 can be miniaturized.

[0101] By miniaturizing the busbar unit 20 in this way, the busbar unit 20's mass and / or cost can be reduced. Furthermore, miniaturization of the busbar unit 20 reduces its mass and shortens the distances between the power points Pu, Pv, and Pw, and the neutral points Nu, Nv, and Nw, which support the busbar unit 20. This increases the natural frequency of the busbar unit 20, suppresses vibrations, and improves its durability.

[0102] In addition, if Figure 21 As shown, in the stator 10 of this embodiment, the first connection point group G1 and the second connection point group G2 are arranged so as not to overlap in the radial direction D2 of the stator core 15. The first connection point group G1 includes the neutral point Nw of the W-phase winding Cw, the motive point Pu of the U-phase winding Cu, and the motive point Pv of the V-phase winding Cv. The second connection point group G2 includes the motive point Pw of the W-phase winding Cw, the neutral point Nu of the U-phase winding Cu, and the neutral point Nv of the V-phase winding Cv. In other words, the area occupied by the first connection point group G1 and the area occupied by the second connection point group G2 in the circumferential direction D1 of the stator core 15 are arranged so as not to overlap in the radial direction D2 and are arranged alternately in the circumferential direction D1. In particular, in the stator 10 of this embodiment, the first connection point group G1 and the second connection point group G2 are arranged so as not to be adjacent to each other in the circumferential direction D1 of the stator core 15. That is, the first connection point group G1 and the second connection point group G2 are arranged spaced apart from each other in the front-rear direction D1 of the stator core 15 .

[0103] [Comparative Example]

[0104] Next, a stator 10x of a comparative example will be described. Figure 22is a side view showing the internal structure of the busbar unit 20x provided in the stator 10x of the comparative example, and Figure 23 This diagram simply illustrates the connection structure of a busbar unit 20x provided in a stator 10x of a comparative example. It should be noted that in the following description, the U-phase winding Cux, V-phase winding Cvx, power points Pux and Pvx, and neutral points Nux and Nvx included in the stator 10x of the comparative example are distinguished from the description of the embodiment by adding an "x" to the symbols. However, the remaining structure and / or positions are the same as those of the U-phase winding Cu, V-phase winding Cv, power points Pu and Pv, and neutral points Nu and Nv described above.

[0105] Figure 22 and Figure 23 The stator 10x of the comparative example shown includes a stator winding SCx, which includes a U-phase winding Cux, a V-phase winding Cvx, and a W-phase winding Cwx. These phase windings Cux, Cvx, and Cwx have the same winding structure as the U-phase winding Cu and the V-phase winding Cv of the aforementioned embodiment. That is, the W-phase winding Cwx is wound around the stator core 15 in the opposite direction to the W-phase winding Cw of the aforementioned embodiment. In other words, in the stator 10x of the comparative example, the U-phase winding Cux, the V-phase winding Cvx, and the W-phase winding Cwx, which have the same winding structure, are wound around the stator core 15 with a phase shift of 120°.

[0106] In the stator 10x of the comparative example, as Figure 23 As shown, the U-phase winding Cux, which winds from slot S1 to slot S8, winds around the stator core 15 while advancing in one direction (the direction of arrow α) of the circumferential direction of the stator core 15. Furthermore, the V-phase winding Cvx, which winds from slot S5 to slot S12, winds around the stator core 15 while advancing in one direction (the direction of arrow α) of the circumferential direction of the stator core 15. Furthermore, the W-phase winding Cwx, which winds from slot S9 to slot S16, winds around the stator core 15 while advancing in one direction (the direction of arrow α) of the circumferential direction of the stator core 15. Thus, the power point Pux of the U-phase winding Cux is located in slot S1, and the neutral point Nux of the U-phase winding Cux is located in slot S8. Furthermore, the power point Pvx of the V-phase winding Cvx is located in slot S5, and the neutral point Nvx of the V-phase winding Cvx is located in slot S12. Furthermore, the power point Pwx of the W-phase winding Cwx is arranged in the slot S9 , and the neutral point Nwx of the W-phase winding Cwx is arranged in the slot S16 .

[0107] like Figure 22 and Figure 23As shown, busbar unit 20x connected to stator winding SCx includes a power busbar 21x connected to the power point Pux of U-phase winding Cux; a power busbar 22x connected to the power point Pvx of V-phase winding Cvx; and a power busbar 23x connected to the power point Pwx of W-phase winding Cwx. Furthermore, busbar unit 20x includes a neutral busbar 24x connected to the neutral point Nux of U-phase winding Cux, the neutral point Nvx of V-phase winding Cvx, and the neutral point Nwx of W-phase winding Cwx.

[0108] Thus, in the stator 10x of the comparative example, since the power points Pux, Pvx, and Pwx are arranged at equal intervals and the neutral points Nux, Nvx, and Nwx are arranged at equal intervals, it is difficult to bring the power points Pux, Pvx, and Pwx and the neutral points Nux, Nvx, and Nwx close to each other, making it difficult to achieve miniaturization of the busbar unit 20x. Figure 22 and Figure 23 As shown, the busbar unit 20x needs to be widened at an angle A2 (about 120 degrees). In contrast, in the stator 10 of the above embodiment, as shown in FIG. Figure 20 and Figure 21 As shown, it is possible to use the busbar unit 20 that is widened at an angle A1 (approximately 90°) smaller than the angle A2 and in which the widening is suppressed.

[0109] In addition, if Figure 23 As shown, in the stator 10x of the comparative example, a first connection point group G1x and a second connection point group G2x are arranged so as to overlap each other in the radial direction D2 of the stator core 15. The first connection point group G1x includes the neutral point Nwx of the W-phase winding Cwx, the power point Pux of the U-phase winding Cux, and the power point Pvx of the V-phase winding Cvx. The second connection point group G2x includes the power point Pwx of the W-phase winding Cwx, the neutral point Nux of the U-phase winding Cux, and the neutral point Nvx of the V-phase winding Cvx. In other words, in the stator 10x of the comparative example, the first connection point group G1x and the second connection point group G2x are arranged adjacent to each other in the circumferential direction D1 of the stator core 15. That is, the first connection point group G1x and the second connection point group G2x are arranged so as to overlap each other in the front-to-back direction D1 of the stator core 15.

[0110] The present invention is not limited to the above-described embodiment and, of course, can be modified in various ways without departing from the spirit of the present invention. In the above description, the U-phase winding Cu is used as the first phase winding, the V-phase winding Cv is used as the second phase winding, and the W-phase winding Cw is used as the third phase winding. However, this is not limiting. For example, the U-phase winding Cu can be used as the second or third phase winding, the V-phase winding Cv can be used as the first or third phase winding, and the W-phase winding Cw can be used as the first or second phase winding. Furthermore, in the above description, the phase windings Cu, Cv, and Cw are formed by connecting multiple segment coils 40 in series, but this is not limiting. For example, multiple segment coils 40 can be connected in series to form a series coil group, and multiple series coil groups can be connected in parallel to form the phase windings Cu, Cv, and Cw.

[0111] In the illustrated example, eight segment coils 40 are inserted into one slot, but this is not limiting. For example, more than eight segment coils 40 may be inserted into one slot, or fewer than eight segment coils 40 may be inserted into one slot. Furthermore, in the above description, a stator core 15 having 48 slots is used, but this is not limiting, and stator cores 15 having other numbers of slots may also be used.

Claims

1. A stator, characterized in that: Provided in a rotating electrical machine, the stator has: a cylindrical stator core having a plurality of slots; a first phase winding including a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end surface of the stator core; a second phase winding including a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end surface of the stator core; a third phase winding including a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end surface of the stator core; as well as A busbar unit comprising: a first power busbar connected to a power point of the first phase winding; a second power busbar connected to a power point of the second phase winding; a third power busbar connected to a power point of the third phase winding; and a neutral busbar connected to a neutral point of the first phase winding, the second phase winding, and the third phase winding. In the circumferential direction of the stator core, The neutral point of the third phase winding is arranged between the power point of the first phase winding and the power point of the second phase winding, The power point of the third phase winding is arranged between the neutral point of the first phase winding and the neutral point of the second phase winding, The stator has: a first connection point group including a neutral point of the third phase winding, a power point of the first phase winding, and a power point of the second phase winding; as well as a second connection point group including a power point of the third phase winding, a neutral point of the first phase winding, and a neutral point of the second phase winding, The neutral point of the third phase winding, the power point of the first phase winding, and the power point of the second phase winding are aligned with each other in radial direction relative to the stator core. The power point of the third phase winding, the neutral point of the first phase winding, and the neutral point of the second phase winding are aligned with each other in radial direction relative to the stator core. The radial position of the first connection point group relative to the stator core and the radial position of the second connection point group relative to the stator core are offset from each other, The first connection point group and the second connection point group are arranged so as not to overlap with each other in the radial direction of the stator core.

2. The stator according to claim 1, characterized in that The first phase winding and the second phase winding are wound around the stator core while advancing in one direction of the circumferential direction of the stator core from the power point to the neutral point. The third phase winding is wound around the stator core while advancing in the other circumferential direction of the stator core from the power point to the neutral point.

3. The stator according to claim 1 or 2, characterized in that: The busbar unit includes an insulating member that holds the first power busbar, the second power busbar, the third power busbar, and the neutral busbar.

4. A stator, characterized in that: Provided in a rotating electrical machine, the stator has: a cylindrical stator core having a plurality of slots; a first phase winding including a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end surface of the stator core; a second phase winding including a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end surface of the stator core; a third phase winding including a plurality of segmented conductors inserted into the slots and having a power point and a neutral point protruding from an end surface of the stator core; as well as A busbar unit comprising: a first power busbar connected to a power point of the first phase winding; a second power busbar connected to a power point of the second phase winding; a third power busbar connected to a power point of the third phase winding; and a neutral busbar connected to a neutral point of the first phase winding, the second phase winding, and the third phase winding. In the circumferential direction of the stator core, The neutral point of the third phase winding is arranged between the power point of the first phase winding and the power point of the second phase winding, The power point of the third phase winding is arranged between the neutral point of the first phase winding and the neutral point of the second phase winding, The stator has: a first connection point group including a neutral point of the third phase winding, a power point of the first phase winding, and a power point of the second phase winding; as well as a second connection point group including a power point of the third phase winding, a neutral point of the first phase winding, and a neutral point of the second phase winding, The neutral point of the third phase winding, the power point of the first phase winding, and the power point of the second phase winding are aligned with each other in radial direction relative to the stator core. The power point of the third phase winding, the neutral point of the first phase winding, and the neutral point of the second phase winding are aligned with each other in radial direction relative to the stator core. The radial position of the first connection point group relative to the stator core and the radial position of the second connection point group relative to the stator core are offset from each other, The first connection point group and the second connection point group are arranged so as not to overlap each other in the radial direction of the stator core. The first phase winding and the second phase winding are wound around the stator core while advancing in one direction of the circumferential direction of the stator core from the power point to the neutral point. The third phase winding is wound around the stator core while advancing in the other circumferential direction of the stator core from the power point to the neutral point.

5. A rotating electrical machine, characterized in that: have: The stator according to claim 1 or 2; and The rotor includes a plurality of permanent magnets arranged in a circumferential direction and is disposed on an inner circumferential side of the stator so as to be rotatable relative to the stator.

6. A rotating electrical machine, characterized in that: have: The stator according to claim 3; and The rotor includes a plurality of permanent magnets arranged in a circumferential direction and is disposed on an inner circumferential side of the stator so as to be rotatable relative to the stator.

7. A rotating electrical machine, characterized in that: have: The stator according to claim 4; and The rotor includes a plurality of permanent magnets arranged in a circumferential direction and is disposed on an inner circumferential side of the stator so as to be rotatable relative to the stator.

8. An electric vehicle, characterized in that: A rotating electrical machine according to any one of claims 5 to 7 is provided as a driving source.

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