Stator for rotating electric machine

Abstract

The invention relates to a stator for a rotary electric machine. A stator for a rotating electrical machine is provided with: a stator coil in which coil parts of each phase are connected in four or more parallel circuits between a neutral line terminal and a power line terminal of each phase; and a stator core having a plurality of slots and around which a stator coil is wound, the stator coil having: slot insertion parts inserted into corresponding ones of the plurality of slots; and a lap joint part exposed from the axial end surface of the stator core and extending in the circumferential direction so as to connect the pair of slot insertion parts, in each phase, the plurality of slot insertion parts of each group include a first slot insertion part directly connected to the power line terminal, and the first slot insertion part of each phase is located on the axial side of the stator core and the second slot insertion part of each phase is located on the axial side of the stator core. And the grooves are positioned on the outermost diameter sides of the corresponding slots.

Description

Technical Field

[0001] The present invention relates to a stator for a rotating electrical machine. Background Art

[0002] There is known a technique in which one end of a plurality of coil pieces forming a stator coil is arranged at the outermost circumference of a stator core in a slot and the other end is arranged at the innermost circumference of the stator core in the slot.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-201485

[0004] However, in the above-mentioned prior art, it is necessary to route the wiring from the end of the innermost coil piece (for example, the power line terminal) to the radial outside of the coil end (need to cross the coil end in the radial direction), which easily leads to an increase in the axial volume of the stator coil. In particular, when the number of parallel coils of each phase is set to four or more, it is easy to adopt such a radially inner terminal configuration based on the relationship between the number of terminals. Summary of the invention

[0005] Therefore, in one aspect, an object of the present invention is to set the number of coil parts connected in parallel in each phase to four or more and to achieve a reduction in the axial volume of the stator.

[0006] In one aspect, there is provided a stator for a rotating electrical machine, comprising:

[0007] A stator coil having coil portions of each phase connected between a neutral line terminal and a power line terminal of each phase in four or more sets of parallel circuits; and

[0008] The stator core has a plurality of slots and is wound with the stator coil.

[0009] The stator coil has:

[0010] a slot insertion portion that is inserted into corresponding slots among the plurality of slots; and

[0011] a lap portion exposed from the axial end surface of the stator core and extending in the circumferential direction in a manner connecting the pair of slot insertion portions,

[0012] In each phase, among the plurality of slot insertion portions in each of the four or more groups, a first slot insertion portion directly connected to the power line terminal is located on one axial side of the stator core and on the outermost diameter side of the corresponding slot.

[0013] In one aspect, according to the present invention, the number of coil portions connected in parallel in each phase can be set to four or more, and the volume of the stator in the axial direction can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top view of the rotating electrical machine (stator) of this embodiment.

[0015] Figure 2 1 is a circuit diagram of a Y-connected three-phase coil according to this embodiment.

[0016] Figure 3 It is a perspective view of the stator of this embodiment.

[0017] Figure 3A It is a side view of the stator of this embodiment.

[0018] Figure 3B 1 is a top view of the stator of this embodiment.

[0019] Figure 3C It is a diagram for explaining the structure of the coil piece forming the stator coil.

[0020] Figure 4 It is a diagram showing the structure of the U1 coil of the U-phase coil.

[0021] Figure 5 It is a diagram showing the structure of the U2 coil of the U-phase coil.

[0022] Figure 6 It is a diagram showing the structure of the U3 coil of the U-phase coil.

[0023] Figure 7 It is a diagram showing the structure of the U4 coil of the U-phase coil.

[0024] Figure 8 It is a diagram showing the arrangement of the terminals of the U-phase coil.

[0025] Fig.9A This is a diagram for explaining a second overlap portion that connects the slot insertion portions of the first turns to each other on the outermost diameter side in the radial direction.

[0026] Fig. 9B This is a diagram for explaining the third overlapped portion connecting the slot insertion portions of the eighth turn to each other on the innermost diameter side in the radial direction.

[0027] Fig.10 It is a perspective view of a stator of a comparative example. DETAILED DESCRIPTION

[0028] Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. In addition, the dimensional ratios in the drawings are only examples and are not limited thereto. In addition, for the sake of convenience of description, the shapes and the like in the drawings are partially exaggerated. Figure 1 ( Figure 3The same also applies to the subsequent drawings, for the sake of convenience in viewing, reference numerals may be given to only a portion of a plurality of identical structural members.

[0029] Figure 1 It is a top view of the rotating electrical machine (stator) of this embodiment.

[0030] In the present specification, the term "axial direction" refers to a direction along the axis (reference numeral O) of the stator core 10 (rotor 150) (Z direction: see Figure 1 ). In addition, one side of the axial direction is set as the Z1 direction side, and the other side is set as the Z2 direction side. In addition, the "circumferential direction" refers to the circumferential direction (A direction) of the stator core 10. One side of the circumferential direction is set as the A1 direction, and the other side is set as the A2 direction. In addition, the "radial direction" refers to the radial direction (B direction) based on the axis of the stator core 10 (rotor 150). Moreover, the "radial inside" and the "inner diameter side" refer to the direction toward the center of the stator core 10 (B1 direction). In addition, the "radial outside" and the "outer diameter side" refer to the direction toward the outside of the stator core 10 (B2 direction).

[0031] like Figure 1 As shown, the rotating electric machine 200 includes a stator 100 and a rotor 150. Each of the stator 100 and the rotor 150 is formed in an annular shape. The stator 100 and the rotor 150 are opposed to each other. The rotor 150 is arranged on the radial inner side (B1 direction side) of the stator 100. The rotor 150 is provided with a plurality of permanent magnets (not shown). That is, the rotating electric machine 200 of this embodiment is configured as an inner rotor type rotating electric machine.

[0032] The stator 100 includes a stator core 10. The stator core 10 is arranged to be opposite to the rotor 150 in the radial direction. In addition, a plurality of (for example, 48) slots 11 are provided in the stator core 10. In addition, teeth 12 are provided between adjacent slots 11. The stator core 10, for example, stacks a plurality of electromagnetic steel plates along the axial direction of the rotation center (Z1 direction and Z2 direction), and is configured to allow magnetic flux to pass through. In addition, the stator core 10 can also be formed by compression molding of magnetic powder. In addition, the stator core 10 has end faces 10a on one side (Z1 direction side) and the other side (Z2 direction side) of the axial direction. In addition, the stator 100 includes a stator coil 20.

[0033] Figure 2 1 is a circuit diagram of a Y-connected three-phase coil according to this embodiment.

[0034] like Figure 2As shown, the stator coil 20 is connected to an external power supply unit and is configured to be supplied with power (for example, three-phase AC power). Moreover, the stator coil 20 is configured to generate a magnetic field by being supplied with power. The stator coil 20 includes a U-phase coil 30, a V-phase coil 40, and a W-phase coil 50 that allow three-phase (U-phase, V-phase, and W-phase) AC currents to flow.

[0035] The U-phase coil 30 includes a U1 coil portion 31, a U2 coil portion 32, a U3 coil portion 33, and a U4 coil portion 34 connected in parallel to each other. In addition, the V-phase coil 40 includes a V1 coil portion 41, a V2 coil portion 42, a V3 coil portion 43, and a V4 coil portion 44 connected in parallel to each other. In addition, the W-phase coil 50 includes a W1 coil portion 51, a W2 coil portion 52, a W3 coil portion 53, and a W4 coil portion 54 connected in parallel to each other. Moreover, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are Y-connected (star-connected). That is, the so-called "4Y" connection is realized. The alternating currents of the U-phase, V-phase, and W-phase are respectively input to the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 from the power line terminal 61. Moreover, the output sides of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are connected to each other via the neutral line terminal 62.

[0036] Figure 3 1 is a perspective view of the stator 100 according to the present embodiment. Figure 3A 1 is a side view of the stator 100 of this embodiment. Figure 3B 1 is a top view of the stator 100 of this embodiment. Figure 3C This is a diagram for explaining the structure of the coil piece 70 that forms the stator coil 20 .

[0037] like Figure 3 As shown, the stator coil 20 is wound on the stator core 10. In this embodiment, the stator coil 20 is formed into a wave winding by forming a plurality of coil sheets 70 ( Figure 3C ) are configured in each of the plurality of slots 11. Specifically, Figure 3C As shown, the stator coil 20 is formed into a wave-wound conductor by connecting a plurality of coil pieces 70. In addition, each of the plurality of coil pieces 70 can have an inverted U shape with the Z1 side regarded as the upper side. In addition, each of the plurality of coil pieces 70 can be in the form of a flat conductor with a rectangular cross-section covered by an insulating coating.

[0038] Each of the plurality of coil sheets 70 includes a slot insertion portion 21 and a bridge portion 22 .

[0039] The slot insertion portion 21 extends in the axial direction (Z direction) and is received in each of the plurality of slots 11 .

[0040] The overlapped portion 22 connects the plurality of slot insertion portions 21 one by one. That is, the overlapped portion 22 connects the slot insertion portions 21 received in different slots 11. The overlapped portion 22 is formed on the Z2 direction side and the Z1 direction side, respectively. In addition, the shape of the overlapped portion 22 is different from each of the first overlapped portion 23, the second overlapped portion 24, and the third overlapped portion 25 described later.

[0041] In addition, if Figure 3C As shown, the coil sheet 70 can be configured to receive the slot insertion portion 21 in each slot 11, and then the overlap portion 22 on the Z2 direction side can be bent toward the circumferential outside, and joined to the overlap portion 22 on the Z2 direction side of a different coil sheet 70 by laser joining or the like.

[0042] In addition, in the stator coil 20, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 have substantially the same structure. Therefore, the U-phase coil 30 will be mainly described below.

[0043] The U-phase coil 30 is arranged in a parallel circuit, and four groups of U1 coil portion 31, U2 coil portion 32, U3 coil portion 33 and U4 coil portion 34 are arranged on the stator core 10. In addition, one end of each of the U1 coil portion 31, U2 coil portion 32, U3 coil portion 33 and U4 coil portion 34 is connected to the power line terminal 61. AC power is supplied from the power line terminal 61. In addition, the other end of each of the U1 coil portion 31, U2 coil portion 32, U3 coil portion 33 and U4 coil portion 34 is connected to the neutral line terminal 62.

[0044] Figure 4 1 is a diagram showing the structure of the U1 coil portion 31 of the U-phase coil. Figure 5 1 is a diagram showing the structure of the U2 coil portion 32 of the U-phase coil. Figure 6 1 is a diagram showing the structure of the U3 coil portion 33 of the U-phase coil. Figure 7 1 is a diagram showing the structure of the U4 coil portion 34 of the U-phase coil. Figure 8 The diagram shows the arrangement of the terminals (power line terminal 61 and neutral line terminal 62 ) of the U-phase coil 30 , and shows only a portion on the outermost diameter side (a one-turn portion on the outermost diameter side in the radial direction) of the U-phase coil 30 . Fig.9A This is a diagram for explaining the second lap portion 24 that connects the slot insertion portions 21 of the first turn to each other on the outermost diameter side in the radial direction. Fig. 9B This is a diagram for explaining the third lap portion 25 that connects the slot insertion portions 21 of the eighth turn to each other on the innermost diameter side in the radial direction.

[0045] like Figure 4 to Figure 7As shown, the U1 coil portion 31, U2 coil portion 32, U3 coil portion 33 and U4 coil portion 34 of the U-phase coil 30 are each arranged in the first (hereinafter "the..." is recorded as "#"), #6, #7, #12, #13, #18, #19, #24, #25, #30, #31, #36, #37, #42, #43 and #48 slots 11 among the 48 slots 11. Here, the slots 11 of #1 and #48, the slots 11 of #6 and #7, the slots 11 of #12 and #13, the slots 11 of #18 and #19, the slots 11 of #24 and #25, the slots 11 of #30 and #31, the slots 11 of #36 and #37, and the slots 11 of #42 and #43 are respectively two slots 11 adjacent to each other in the circumferential direction (direction A). In addition, Figure 4 to Figure 7 The figure shows the stator core 10 in an unfolded form, with the up-down direction being the radial direction (B direction) of the stator core 10 and the left-right direction being the circumferential direction (A direction) of the stator core 10. Figure 4 to Figure 7 Although not shown in the figure, the V-phase coil 40 and the W-phase coil 50 are arranged in the stator core 10 at a distance of two slots 11 and four slots 11 from the U-phase coil 30, respectively.

[0046] The plurality of slot insertion portions 21 are housed in each of the plurality of slots 11 in a state of being arranged along the radial direction (B direction) of the stator core 10. Specifically, in the present embodiment, eight slot insertion portions 21 are arranged in a row along the radial direction and arranged in one slot 11. For example, in one slot 11, the slot insertion portion 21 arranged on the outermost side (outer diameter side: B2 direction side) is set as the first turn (first layer), and the slot insertion portion 21 arranged on the innermost side (inner diameter side: B1 side) is set as the eighth turn (eighth layer). In addition, in Figure 4 to Figure 7 In FIG. 1 , the slot insertion portion 21 is arranged at a position indicated by white numbers on a black background so that current flows in the order of the white numbers (current from the power supply portion toward the U-phase coil 30 in the alternating current).

[0047] In this embodiment, the overlapping portion 22 includes a first overlapping portion 23, a second overlapping portion 24 and a third overlapping portion 25. Figure 4 to Figure 7 , it is shown that the lap joint 22 (first lap joint 23, second lap joint 24 and third lap joint 25) indicated by the solid line is arranged on the Z1 direction side of the stator core 10, and the lap joint 22 (first lap joint 23) indicated by the dotted line is arranged on the Z2 direction side of the stator core 10. Figure 4 to Figure 7In the figure, when viewed from the Z direction, the overlap portion 22 (the first overlap portion 23, the second overlap portion 24 and the third overlap portion 25) is schematically illustrated as a straight line, but when viewed from the Z direction, the overlap portion 22 (the first overlap portion 23, the second overlap portion 24 and the third overlap portion 25) may also have a curved shape.

[0048] The first lap portion 23 connects the slot insertion portions 21 with different radial (B direction) positions among the multiple slot insertion portions 21 accommodated in different slots 11 in pairs. Specifically, the first lap portion 23 connects the slot insertion portions 21 in a manner that the radial positions (number of turns) of the connected slot insertion portions 21 are gradually changed toward one side in the radial direction. That is, the first lap portion 23 connects the slot insertion portions 21 in pairs in a manner that the number of turns increases toward one side in the circumferential direction (the A1 direction side). Through such a first lap portion 23 and the slot insertion portions 21, four wave winding portions 20a, wave winding portion 20b, wave winding portion 20c, and wave winding portion 20d that are wave-wound on the stator core 10 are formed respectively.

[0049] In the present embodiment, in each of the wave winding parts 20a to 20d, the slot insertion parts 21 are connected by connecting a plurality of first laps 23 to the slot insertion parts 21, so that the slot insertion parts 21 arranged on the outermost radial side (first turn) are connected to the slot insertion parts 21 arranged on the innermost radial side (eighth turn) in sequence. That is, the plurality of first laps 23 connect the slot insertion parts 21 in pairs in such a manner that the radial positions of the connected slot insertion parts 21 are changed stepwise in sequence from the slot insertion part 21 arranged on the other radial side (for example, the B2 direction side), that is, the position of the first turn, to the slot insertion part 21 arranged on the one side (for example, the B1 direction side), that is, the position of the eighth turn. In the present embodiment, the first laps 23 connect the slot insertion parts 21 arranged in different slots 11, which are arranged to be shifted one by one in the radial direction (B direction) to the outside or inside, in pairs. That is, in each of the wave winding portions 20 a to 20 d , the first overlapping portion 23 connects the slot insertion portions 21 while sequentially shifting by one turn from the eighth turn to the first turn.

[0050] The wave winding parts 20a to 20d are arranged to reciprocate at least once (in the present embodiment, reciprocate twice). One wave winding part 20a is wound in a wave shape along one side of the circumference of the stator core 10 (for example, the A1 direction) through the slot insertion part 21 and the first overlap part 23. Moreover, the wave winding part 20b connected to the wave winding part 20a is wound in a wave shape along the other side of the circumference opposite to the wave winding part 20a (for example, the A2 direction). The wave winding part 20c and the wave winding part 20d are similarly wound in a wave shape toward one side and the other side of the circumference, respectively. Moreover, by sequentially connecting the wave winding part 20a, the wave winding part 20b, the wave winding part 20c and the wave winding part 20d, each of the U1 coil part 31, the U2 coil part 32, the U3 coil part 33 and the U4 coil part 34 of the U-phase coil 30 of the stator coil 20 is formed. That is, each of the U1 coil portion 31 , the U2 coil portion 32 , the U3 coil portion 33 , and the U4 coil portion 34 is folded back three times in the circumferential direction and is arranged in the stator core 10 .

[0051] In this embodiment, the wave winding parts 20a to 20d are connected to each other by any one of the second lap part 24 and the third lap part 25. Each of the second lap part 24 and the third lap part 25 connects the slot insertion parts 21 with the same radial position (number of turns) in a plurality of slot insertion parts 21 accommodated in different slots 11 in pairs. Specifically, the second lap part 24 connects the slot insertion parts 21 arranged at the outermost side (first turn) in the radial direction in each of the plurality of slots 11. The third lap part 25 connects the slot insertion parts 21 arranged at the innermost side (eighth turn) in the radial direction in each of the plurality of slots 11. Moreover, by connecting the slot insertion parts 21 in pairs by the second lap part 24 or the third lap part 25, the wave winding parts 20a to 20d formed by the first lap part 23 and the slot insertion part 21 are connected in a manner that one reciprocates once and the other is folded back. For example, in the U1 coil portion 31 , one conductor that is folded back multiple times and wave-wound is formed by four wave winding portions 20 a to 20 d , one second lap portion 24 , and two third lap portions 25 .

[0052] Specifically, if Figure 4As shown, in the U1 coil portion 31, the power line terminal 61 is connected from the slot insertion portion 21 (the portion numbered 1 in white) on the outermost diameter side (first turn) of the slot 11 arranged at #37. In addition, the power line terminal 61 may be in the form of an end portion of the coil sheet 70, or in the form of another component joined to the end portion of the coil sheet 70. Moreover, after the slot insertion portion 21 extends along the slot 11 toward the Z2 direction, the first lap portion 23 extends from #37 to #31 as the lap portion 22 on the Z2 direction side. Moreover, on the Z2 direction side of the stator core 10, the first lap portion 23 is offset one from the outermost diameter side to the inner side in the slot 11 of #31 and connected to the slot insertion portion 21 (the portion numbered 2) arranged in the second turn. Then, the first overlapped portion 23 is alternately connected to the slot insertion portion 21 in the Z1 direction side and the Z2 direction side in the order of the third turn of the slot 11 of #25, the fourth turn of the slot 11 of #19, and the fifth turn of the slot 11 of #13, and is connected to the slot insertion portion 21 (numbered 8) of the eighth turn of the slot 11 of #43 while increasing the number of turns by one each toward the inside. In this way, the wave winding portion 20a connected by eight slot insertion portions 21 and seven first overlapped portions 23 is formed.

[0053] Furthermore, the third lap portion 25 is provided in a folded manner on the Z1 direction side of the stator core 10 from the slot insertion portion 21 of the eighth turn of the slot 11 of #43 (the portion numbered 8 in white) to the slot insertion portion 21 of the eighth turn of the slot 11 of #48 (the portion numbered 9). After folding back through the third lap portion 25, the direction is changed toward the A2 direction side in the circumferential direction from the slot 11 of #48 where the portion numbered 9 is provided to the slot 11 of #42, and the wave winding portion 20b is formed in the same manner as the wave winding portion 20a. Furthermore, the second lap portion 24 is provided on the Z1 direction side of the stator core 10 from the slot insertion portion 21 of the first turn of the slot 11 of #42 (the portion numbered 16) to the slot insertion portion 21 of the first turn of the slot 11 of #1 (the portion numbered 17), and the U1 coil portion 31 is folded back from the wave winding portion 20b to the wave winding portion 20c. Then, the U1 coil portion 31 is also folded back from the wave winding portion 20c to the wave winding portion 20d through the third lap portion 25. In this way, one U1 coil portion 31 is formed by the four wave winding portions 20a to 20d folded back three times. In addition, the wave winding portion 20d is connected to the neutral line terminal 62 from the slot insertion portion 21 (the portion numbered 32) of the first turn of the slot 11 of #6. In addition, the neutral line terminal 62 can be in the form of the end of the coil sheet 70, or in the form of another component joined to the end of the coil sheet 70.

[0054] Thus, the first lap 23 connects the second turn to the third turn, the fourth turn to the fifth turn, and the sixth turn to the seventh turn, and is arranged on the Z1 direction side. In addition, the second lap 24 connecting the first turns to each other and the third lap 25 connecting the eighth turns to each other are all arranged on the Z1 direction side. In addition, the power line terminal 61 and the neutral line terminal 62 are also connected on the Z1 direction side.

[0055] Hereinafter, when distinguishing from other slot insertion parts 21, the slot insertion part 21 directly connected to the power line terminal 61 among the plurality of slot insertion parts 21 (the slot insertion part 21 inserted into the slot 11 of #37 in the U1 coil part 31) is also referred to as the "first slot insertion part 21A". In addition, when distinguishing from other slot insertion parts 21, the slot insertion part 21 directly connected to the neutral line terminal 62 among the plurality of slot insertion parts 21 (the slot insertion part 21 inserted into the slot 11 of #6) is also referred to as the "second slot insertion part 21B". In addition, when distinguishing from other slot insertion parts 21, the slot insertion part 21 inserted into the innermost diameter side (eighth turn) of the slot 11 among the plurality of slot insertion parts 21 (the slot insertion part 21 inserted into the slots 11 of #7, #12, #43, and #48) is also referred to as the "third slot insertion part 21C".

[0056] In the present embodiment, as described above, each slot insertion portion 21 along the flow direction of the current from the first slot insertion portion 21A to the second slot insertion portion 21B is inserted into the corresponding slot 11 in a manner that has at least one (in this example, "three times") reversal of the change trend (increase and decrease) of the slot number. The "slot number" mentioned here refers to a number that increases relatively in sequence clockwise or counterclockwise relative to the stator core 10 along the circumferential direction when viewed in the axial direction. In the case of the present embodiment, if #1 to #48 are made to correspond to the slot number, the direction of increasing from #1 to #48 corresponds to the direction of increasing the slot number, and the direction of changing from #48 via #1 also corresponds to the direction of increasing the slot number. In addition, the direction of decreasing from #48 to #1 corresponds to the direction of decreasing the slot number, and the direction of changing from #1 via #48 also corresponds to the direction of decreasing the slot number.

[0057] In particular, in the present embodiment, in each of the U1 coil portion 31, the U2 coil portion 32, the U3 coil portion 33, and the U4 coil portion 34, the slot number increase and decrease are reversed starting from the third slot insertion portion 21C in the direction of current flow from the first slot insertion portion 21A to the second slot insertion portion 21B. For example, in the case of the U1 coil portion 31, the slot number decreases from the first slot insertion portion 21A to the first third slot insertion portion 21C (the third slot insertion portion 21C of the slot 11 inserted into #43) in the direction of current flow, and the slot number increases from the last third slot insertion portion 21C (the third slot insertion portion 21C of the slot 11 inserted into #12) to the second slot insertion portion 21B in the direction of current flow, and is inserted into the corresponding slot.

[0058] In addition, in the present embodiment, in each of the U1 coil portion 31, the U2 coil portion 32, the U3 coil portion 33, and the U4 coil portion 34, the radial position of each slot insertion portion 21 along the flow direction of the current from the first slot insertion portion 21A to the second slot insertion portion 21B is changed regularly. For example, in the case of the U1 coil portion 31, when the slot number decreases, the radial position in the slot 11 is shifted radially inward by one turn (refer to the first lap portion 23). In addition, when the slot number increases, the radial position in the slot 11 is shifted radially outward by one turn (refer to the first lap portion 23) or the same radial position is maintained (refer to the second lap portion 24 and the third lap portion 25).

[0059] like Figure 5 to Figure 7 As shown, each of the U2 coil portion 32 , the U3 coil portion 33 and the U4 coil portion 34 is also similar to the U1 coil portion 31 , and is formed as a part of the stator coil 20 that is folded back multiple times and wave-wound by folding back the four wave winding portions 20 a to 20 d .

[0060] In particular, in this embodiment, each of the U2 coil portion 32, the U3 coil portion 33, and the U4 coil portion 34 is also the same as the U1 coil portion 31, and the power line terminal 61 and the neutral line terminal 62 are arranged radially outward. Figure 8 As shown, the power line terminal 61 and the neutral line terminal 62 of each phase are arranged on the radial outside of the stator core 10. Figure 8 In the figure, the reference numerals U, V, and W represent each phase, and the numbers 1 to 4 after the reference numerals U, V, and W represent a corresponding group of the four groups. For example, U1 to U4 represent the U1 coil portion 31, the U2 coil portion 32, the U3 coil portion 33, and the U4 coil portion 34, respectively. In addition, the last "_in" and "_out" represent the power line terminal 61 and the neutral line terminal 62, respectively.

[0061] Here, in this embodiment, Figure 3B As shown, in the U-phase coil 30, the power line terminals 61 of the U1 coil portion 31 and the U2 coil portion 32 and the power line terminals 61 of the U3 coil portion 33 and the U4 coil portion 34 are set at diagonal positions in the circumferential direction. This is also true for the V-phase coil 40 and the W-phase coil 50.

[0062] In addition, in the present embodiment, the first lap part 23 of one of the wave winding parts 20a to 20d that forms one reciprocation and the first lap part 23 of the other one that forms one reciprocation connect the slot insertion parts 21 one by one so as to change the radial position of the connected slot insertion parts 21 in parallel and in a stepwise (inclined) manner. In addition, in each of the plurality of wave winding parts 20a to 20d, the number (pitch) of slots 11 spanned by the first lap part 23 is the same. Specifically, when the first lap part 23 connects the slot insertion parts 21 to each other by shifting one turn, it spans five slots 11 to connect the slot insertion parts 21 to each other. In other words, in each of the plurality of wave winding parts 20a to 20d, the number of pitches of the first lap part 23 is "6". The first lap part 23 has the same pitch on one side (Z1 direction side) and the other side (Z2 direction side) of the stator core 10. In addition, the term "parallel" here means that the slot insertion portion 21 connected to the first overlap portion 23 is arranged in parallel along the circumferential direction. Figure 4 to Figure 7 The illustration refers to the state in which the slot insertion parts 21 are positioned parallel to each other in the state in which the stator core 10 is shown in the form of an unfolded annular shape.

[0063] In addition, in each of the second overlapped portion 24 and the third overlapped portion 25, there are two types of pitch numbers: 5 and 7. For example, in Figure 4 In the U1 coil part 31, a second lap part 24 with a pitch number of 7 is provided between #42 and #1 of the slot 11, and a third lap part 25 with a pitch number of 5 is provided between #43 and #48 and between #7 and #12. Figure 5 In the U2 coil portion 32, a second lap portion 24 with a pitch number of 5 is provided between #43 and #48 of the slot 11, and a third lap portion 25 with a pitch number of 7 is provided between #42 and #1, and between #6 and #13.

[0064] In addition, if Fig.9A as well as Fig. 9BAs shown, the second overlaps 24 or the third overlaps 25 connected to the slot insertion portion 21 configured in the common slot 11 and the second overlaps 24 or the third overlaps 25 with different pitch numbers are arranged to overlap each other when viewed from the axial direction (Z direction). The second overlap 24 or the third overlap 25 with a large pitch number is arranged on the upper side (Z1 direction side) of the second overlap 24 or the third overlap 25 with a small pitch number. Specifically, the second overlap 24 and the third overlap 25 with a pitch number of 7 are respectively arranged to cover the second overlap 24 and the third overlap 25 with a pitch number of 5 on the upper side.

[0065] In addition, if Figure 4 to Figure 7 As shown, one slot insertion portion 21 forming one reciprocating movement and another slot insertion portion 21 forming another reciprocating movement of the plurality of wave winding portions 20a to 20d are respectively arranged in mutually adjacent slots 11. In addition, each of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 is alternately arranged in a pair of mutually adjacent slots 11 along the radial direction.

[0066] For example, in Figure 4 In the U1 coil portion 31 of the U phase, the slot insertion portion 21 forming the wave winding portion 20a to 20d is accommodated in two slots 11 adjacent to each other in the circumferential direction, namely #1 and #48, #6 and #7, #12 and #13, #18 and #19, #24 and #25, #30 and #31, #36 and #37, #42 and #43. Moreover, in the adjacent (one reciprocating) wave winding portions 20a to 20d, the slot insertion portions 21 are alternately arranged in different slots 11. Moreover, Figure 5 to Figure 7 The U2 coil portion 32, U3 coil portion 33 and U4 coil portion 34 of the U phase are also the same as the U1 coil portion 31 of the U phase. Thus, the positional relationship of the permanent magnet (not shown) with respect to the rotor 150 can be suppressed from being unbalanced among the U1 coil portion 31, U2 coil portion 32, U3 coil portion 33 and U4 coil portion 34 of the U phase.

[0067] In addition, in the present embodiment, seven types of coil sheets 70 are used to form the stator coil 20. That is, three types of coil sheets 70 constituting a pair of slot insertion parts 21 and a first lap part 23, two types of coil sheets 70 constituting a pair of slot insertion parts 21 and a second lap part 24, and two types of coil sheets 70 constituting a pair of slot insertion parts 21 and a third lap part 25 are used. The three types of coil sheets 70 constituting a pair of slot insertion parts 21 and a first lap part 23 are on the Z1 direction side, and the first lap part 23 is connected from the second turn to the third turn of the coil sheet 70, from the fourth turn to the fifth turn of the coil sheet 70, and from the sixth turn to the seventh turn of the coil sheet 70. The two types of coil sheets 70 constituting a pair of slot insertion parts 21 and a second lap part 24, and the two types of coil sheets 70 constituting a pair of slot insertion parts 21 and a third lap part 25 are respectively two types of the number of pitches 5 and 7.

[0068] Here, refer to Fig.10 The comparative example shown is used to illustrate the effect of this embodiment.

[0069] Fig.10 1 is a perspective view of a stator 100 ′ of a comparative example. The stator 100 ′ of the comparative example is different in that a part of the power line terminal 61 ′ and the neutral line terminal 62 ′ are arranged radially inward of the stator core 10 .

[0070] In such a comparative example, as described in the above “Problems to be Solved by the Invention” column, it is necessary to route the wiring from the innermost power line terminal 61′ from the axial outer side of the coil end to the radial outer side (need to cross the coil end in the radial direction) (for example, refer to Fig.10 The stator 100' may be easily increased in the axial direction due to the stator coil 20'. In particular, when the number of coils of each phase is set to four or more in parallel as in the present embodiment, it is easy to adopt such a configuration of radially inner terminals based on the relationship that the number of terminals increases.

[0071] In contrast, according to the present embodiment, as described above, the power line terminals 61 and the neutral line terminals 62 of each phase are arranged radially outside the stator core 10. According to the above structure, the disadvantage that at least one power line terminal 61 is arranged radially inside can be avoided. Fig.10 Unlike the comparative example described above, the increase in the axial volume of the stator 100 caused by the stator coil 20 can be prevented. In other words, according to the present embodiment, the number of parallel coils of each phase can be set to four, and the axial volume of the stator 100 can be reduced.

[0072] Therefore, according to this embodiment, if Figure 3AAs shown, the power line terminal 61 can be arranged axially inwardly than the axially outermost position of the overlap 22 (i.e., the axially outermost position of the coil end, refer to line L3) when viewed in the radial direction. As a result, the increase in the axial volume of the stator 100 caused by the power line terminal 61 can be prevented, and as a result, the axial volume of the stator 100 can be reduced. In this case, the wiring connected to the power line terminal 61, that is, the wiring for the inverter (not shown) (for example, the wiring in the form of a cable) can also be arranged axially inwardly than the axially outermost position of the overlap 22 when viewed in the radial direction.

[0073] In addition, according to this embodiment, if Figure 3A (as well as Figure 3 ), the neutral terminal 62 and the neutral busbar 63 connected to the neutral terminal 62 can be arranged axially inward of the axially outermost position of the overlap 22 (i.e., the axially outermost position of the coil end, refer to line L3) when viewed in the radial direction. As a result, the increase in the axial volume of the stator 100 caused by the neutral terminal 62 and the neutral busbar 63 connected to the neutral terminal 62 can be prevented, and as a result, the axial volume of the stator 100 can be reduced.

[0074] In this embodiment, in addition to the above-mentioned effects, the following effects can be obtained.

[0075] In the present embodiment, as described above, the first overlap portion 23 connects the slot insertion portions 21 in pairs by changing the radial position of the connected slot insertion portions 21 in stages in sequence toward one side of the radial direction, and forms the wave winding portions 20a to 20d that are wave-wound in the stator core 10 together with the slot insertion portions 21. Thus, in each of the plurality of slots 11, unlike the case where the slot insertion portions 21 adjacent to each other in the radial direction are alternately connected, the slot insertion portions 21 can be connected to each other without setting a portion of the radial position of the slot insertion portion 21 that is switched in the middle. Therefore, the increase in the variety of shapes of the coil sheet 70 on one side of the axial direction of the stator core 10 can be suppressed. As a result, the increase in the variety of coil sheets 70 used to form the stator coil 20 can be suppressed. In addition, in the present embodiment, as described above, the second laps 24 and the third laps 25 connect the slot insertion portions 21 one by one, thereby connecting one and another of the wave winding portions 20a to 20d formed by the first laps 23 and the slot insertion portions 21 in a folded manner. Thus, the wave winding portions 20a to 20d can be connected in a folded manner by the second laps 24 and the third laps 25 connecting the slot insertion portions 21 at the same radial positions in the slot 11, so that the shape of the folded portion can be prevented from becoming complicated.

[0076] In this embodiment, as described above, in one and the other of the wave winding parts 20a to 20d that reciprocate once, the radial positions of the slot insertion parts 21 that are configured to be connected are parallel to each other and are changed in stages, so that the shapes of the conductors (coil pieces 70) that constitute the wave winding parts 20a to 20d that reciprocate once can be made common. Therefore, even in the case where the wave winding parts 20a to 20d that reciprocate once are connected in a folded manner, the types of coil pieces 70 used to form the stator coil 20 can be reduced.

[0077] In this embodiment, as described above, in each of the plurality of slots 11, the wave winding portions 20a to 20d can be formed by disposing the slot insertion portions 21 connected in stages from the end of one side in the radial direction toward the end of the other side, so that the ends of the wave winding portions 20a to 20d can be disposed at the outermost side in the radial direction. Therefore, when the power line terminal 61 or the neutral line terminal 62 is connected to the stator coil 20, the complication of the manufacturing process can be suppressed compared to the case of connecting the conductor (coil piece 70) in the middle of the slot 11.

[0078] In the present embodiment, as described above, the stator coil 20 that is folded back multiple times and wave-wound is formed by the plurality of wave winding portions 20a to 20d, the second overlap portion 24 (outermost coil end portion), and the third overlap portion 25 (innermost coil end portion), so the stator coil 20 can be formed by folding back multiple times and wave-wound in each of the radial innermost and outermost portions of the slot 11. Therefore, even when the number of slot insertion portions 21 accommodated in one slot 11 increases, the stator coil 20 can be formed by folding back multiple times in each of the radial innermost and outermost portions of the slot 11, so that the number of types of coil sheets 70 constituting the stator coil 20 can be suppressed from increasing.

[0079] In the present embodiment, as described above, the stator coil 20 can be formed by connecting the slot insertion parts 21 arranged one by one radially outward or inward, so that the slot insertion parts 21 can be densely arranged in each of the plurality of slots 11. Therefore, the slot insertion parts 21 can be connected in pairs in such a manner that the slot insertion parts 21 are efficiently connected to the plurality of slot insertion parts 21 arranged in the slots 11 and the radial positions of the connected slot insertion parts 21 are sequentially changed stepwise toward one side in the radial direction.

[0080] Here, in the case where the slot insertion portion 21 is arranged in the common slot 11 in both one and the other of the wave winding portions 20a to 20d that reciprocate once, the positional relationship of the stator coil 20 with respect to the magnet arranged in the rotor 150 that faces the stator 100 becomes unbalanced, so that the current flowing through the wave winding portions 20a to 20d is deviated. In consideration of this point, in the present embodiment, as described above, by arranging the slot insertion portion 21 of one of the wave winding portions 20a to 20d that reciprocate once and the slot insertion portion 21 of the other of the wave winding portions 20a to 20d that reciprocate once, respectively, in the slots 11 that are adjacent to each other, it is possible to suppress the current flowing through the wave winding portions 20a to 20d from being deviated.

[0081] Although each embodiment is described in detail above, it is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the technical claims. In addition, all or a plurality of the structural components of the above-mentioned embodiments can also be combined.

[0082] For example, in the above embodiment, although the neutral terminal 62 is arranged radially outside, part or all of the neutral terminal 62 may be arranged radially inside the stator core 10. That is, part or all of the second slot insertion portion 21B may be arranged radially on the innermost diameter side in the slot 11.

[0083] In addition, in the above-mentioned embodiment, although the first overlapped portion 23 forming one of the wave winding portions 20a to 20d and the first overlapped portion 23 forming the other wave winding portions 20a to 20d are parallel to each other and the radial positions of the connected slot insertion portions 21 are changed stepwise, the present invention is not limited thereto. For example, the radial positions of the slot insertion portions 21 in the one wave winding portion and the other wave winding portion may not be parallel to each other.

[0084] In the above-described embodiment, the wave winding portions 20a to 20d are folded back at the outermost and innermost sides in the radial direction, but the present invention is not limited thereto. For example, the wave winding portions 20a to 20d may be folded back halfway in the radial direction.

[0085] In the above embodiment, the stator coil 20 is formed by four wave winding parts 20a to 20d and folded three times, but the present invention is not limited thereto. For example, the stator coil 20 may be formed by two wave winding parts and folded only once.

[0086] In addition, in the above embodiment, although the first overlap portion 23 connects the slot insertion portions 21 arranged in different slots 11 and arranged to be offset by one turn in the radial direction to the outside or inside, the present invention is not limited to this. For example, the first overlap portion 23 may connect the slot insertion portions arranged to be offset by two or more turns. In other words, the slot insertion portions offset by two or more turns may be connected.

[0087] In addition, in the above-mentioned embodiment, although the example in which the slot insertion part 21 forming one of the wave winding parts 20a to 20d that reciprocates once and the slot insertion part 21 forming the other one are respectively arranged in mutually adjacent slots 11 is shown, it is not limited to this. For example, the slot insertion part forming one of the wave winding parts that reciprocates once and the slot insertion part forming the other wave winding part that reciprocates once may be arranged in a common slot. In addition, the slot insertion part forming one of the wave winding parts that reciprocates once and the slot insertion part forming the other wave winding part that reciprocates once may be arranged in mutually separated slots.

[0088] In addition, in the above-mentioned embodiment, although an example of forming the stator coil 20 by the inverted U-shaped coil piece 70 is shown, it is not limited to this. For example, the coil end portion can also be formed by arranging a rod-shaped coil piece as a slot insertion portion in the slot and then joining a coil piece different from the rod-shaped coil piece. In addition, the coil portion can also be formed by combining an inverted U-shaped coil piece and a U-shaped coil piece from one side and the other side of the axial direction of the stator core 10.

[0089] In addition, in the above embodiment, although the example in which each of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 constitutes four coils connected in parallel is shown, the present invention is not limited to this. For example, each of the U-phase coil, the V-phase coil, and the W-phase coil may be a structure of six or more coils connected in parallel, such as six coils connected in parallel or eight coils connected in parallel.

[0090] In addition, in the above embodiment, although 48 slots 11 are provided in the stator core 10, and eight slot insertion portions 21 are arranged in the radial direction in each slot 11, the present invention is not limited to this. For example, the number of slots in the stator core may be other than 48. In addition, the number of slot insertion portions accommodated in one slot may be other than eight.

[0091] Description of Reference Numerals

[0092] 100… stator (stator for rotating electrical machine), 20… stator coil, 31… U1 coil portion (coil portion), 32… U2 coil portion (coil portion), 33… U3 coil portion (coil portion), 34… U4 coil portion (coil portion), 41… V1 coil portion (coil portion), 42… V2 coil portion (coil portion), 43… V3 coil portion (coil portion), 44… V4 coil portion (coil portion), 51… W1 coil portion (coil portion), 52… W2 coil portion (coil portion), 53… W3 coil portion (coil portion), 54… W4 coil portion (coil portion), 10… stator core, 11… slot, 21… slot insertion portion, 21A… first slot insertion portion, 21B… second slot insertion portion, 21C… third slot insertion portion, 22… lap portion, 61… power line terminal, 62… neutral line terminal.

Claims

1. A stator for a rotating electrical machine, wherein: have: A stator coil having coil portions of each phase connected between a neutral line terminal and a power line terminal of each phase in four or more sets of parallel circuits; and The stator core has a plurality of slots and is wound with the stator coil. The stator coil has: a slot insertion portion that is inserted into corresponding slots among the plurality of slots; and a lap portion exposed from the axial end surface of the stator core and extending in the circumferential direction in a manner connecting the pair of slot insertion portions, In each phase, among the plurality of slot insertion portions in each of the four or more groups, a first slot insertion portion directly connected to the power line terminal is located on one axial side of the stator core and on the outermost diameter side of the corresponding slot.

2. The stator for a rotating electrical machine according to claim 1, wherein: In each phase, the second slot insertion portion directly connected to the neutral terminal among the plurality of slot insertion portions in each group is located on the outermost diameter side of the corresponding slot on the axial side of the stator core.

3. The stator for a rotating electrical machine according to claim 2, wherein: When the above-mentioned multiple slots are assigned slot numbers that increase relatively in sequence clockwise or counterclockwise along the circumferential direction relative to the above-mentioned stator core when observed axially, in each group of one phase in the above-mentioned stator coil, each slot insertion part along the flow direction of current from the above-mentioned first slot insertion part to the above-mentioned second slot insertion part is inserted into the corresponding slot in a manner in which a reversal of the slot number from a first direction of either an increasing direction or a decreasing direction to a second direction of the other occurs at least once.

4. The stator for a rotating electrical machine according to claim 3, wherein: In each phase, the plurality of slot insertion portions in each group include, in addition to the first slot insertion portion and the second slot insertion portion, at least one third slot insertion portion located on the innermost diameter side of the corresponding slot. In each of the above-mentioned groups, each slot insertion part along the above-mentioned flow direction from the above-mentioned first slot insertion part to the above-mentioned second slot insertion part is inserted into the corresponding slot in a manner that the slot number changes in the above-mentioned flow direction from the above-mentioned first slot insertion part to the initial above-mentioned third slot insertion part toward the above-mentioned first direction, and in a manner that the slot number changes in the above-mentioned flow direction from the last above-mentioned third slot insertion part to the above-mentioned second slot insertion part toward the above-mentioned second direction.

5. The stator for a rotating electrical machine according to claim 3, wherein: In each of the above-mentioned groups, each slot insertion portion along the above-mentioned flow direction from the above-mentioned first slot insertion portion to the above-mentioned second slot insertion portion is inserted into the corresponding slot in a manner that the radial position in the slot is shifted one turn radially inward when the slot number changes toward the above-mentioned first direction, and in a manner that the radial position in the slot is shifted one turn radially outward when the slot number changes toward the above-mentioned second direction, or the same radial position is maintained.

6. The stator for a rotating electrical machine according to claim 1, wherein: It also includes a neutral point bus bar connecting the plurality of neutral line terminals in the stator coil. The neutral point generatrix is ​​located axially inward of the axially outermost position of the overlap portion when viewed in the radial direction.

7. The stator for a rotating electrical machine according to any one of claims 1 to 6, wherein: The power line terminal is located axially inward of the axially outermost position of the overlap portion when viewed in the radial direction.

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