Stator, rotating machine, and method for manufacturing stator

Abstract

To set the number of turns to an odd number in a hairpin type stator.SOLUTION: A stator of a rotating machine has a stator core having a plurality of slots, and a plurality of segment coils being rectangular wires accommodated in the plurality of slots. With respect to the plurality of segment coils, a first layer of a first slot among the plurality of slots begins to be wound, the first layer of the first slot and a layer adjacent in a plus direction to a first layer of a second slot separated from the first slot to one side in a circumferential direction by slot pitch number are connected, and in the same connection way the slots are connected up to the N-th layer.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a stator, a rotating machine, and a method for manufacturing a stator. [Background technology]

[0002] In rotating machines, such as motors for electric vehicles, there is a demand for high torque density and high power density. Recently, rectangular wires have been used for the stator windings to improve the space factor.

[0003] In addition, in the past, a configuration has been known in which the straight portions of adjacent coils in each layer are positioned at the same radial position within the slot in order to make it easier to install wave-wound coils using rectangular wire into the slots of a starter core (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-115180 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional hairpin methods, which alternately connect pairs of segment coils, have the problem that only an even number of turns can be selected. This is because, on the other axial side, the legs of the segment coils are connected in order from the first to the second layer, the third to the fourth layer, and so on, so if the number of turns is odd, there are extra legs and it is not possible to create pairs. If only an even number of turns can be selected, only the electrical characteristics of an even number of turns can be achieved, which creates the problem of low flexibility in electrical characteristics.

[0006] The present invention aims to provide a hairpin type stator with an odd number of turns. [Means for solving the problem]

[0007] A stator according to one aspect of the present invention is a stator for a rotating machine, the number of slots per pole per phase of the rotating machine being q=2, the stator core having a plurality of slots, and a plurality of segment coils made of rectangular wire housed in the plurality of slots, the number of layers of the plurality of slots being N (N is an odd number), the outermost layer of the plurality of slots being a first layer, the innermost layer of the plurality of slots being an Nth layer, the plurality of segment coils being wound as a first coil group starting from a first layer of a first slot of the plurality of slots, and a first coil group being wound from the first layer of the first slot and a second coil group being wound from the first layer of the first slot to one side in the circumferential direction from the first slot. Prescribed The first layer of the second slot, which is separated by the number of slot pitches, is connected to the adjacent layer in the positive direction, and the same connection is used to connect up to the Nth layer, and the slot of the Nth layer is the third slot, and as a bridge between the Nth layers, the Nth layer of the third slot and the third slot on one side in the circumferential direction are connected. The predetermined The Nth layer of the fourth slots that are spaced apart by the number of slot pitches is connected, and the Nth layer of the fourth slots and the fourth slot on the other circumferential side are connected. The predetermined The Nth layer of the fifth slot, which is separated by the number of slot pitches, is connected to the layer adjacent in the negative direction, and is connected to the first layer in the same manner. The first layer slot is a sixth slot, and as a transition between the first layers, the first layer of the sixth slot and the sixth slot on one side in the circumferential direction are connected to the first layer of the sixth slot. The predetermined The first layer of the seventh slot, which is separated by the number of slot pitches, is connected to the first layer of the first slot, and the winding from the first layer of the first slot is repeated from the first layer of the seventh slot, and the winding from the first slot to the other circumferential side is The predetermined It was wound using wave winding to connect to the first layer of the eighth slot, which is the end of the winding that is the number of slot pitches away.

[0008] In the stator according to the above aspect, the bridge between the Nth layers may be arranged on the anti-rotor insertion side in the axial direction, and the bridge between the first layers may be arranged on the rotor insertion side in the axial direction.

[0009] In one embodiment of the stator of the present invention, the multiple segment coils may be wound as a second coil group, starting from a ninth slot adjacent to the first layer of the first slot in the positive direction, and may be wound in the same wave winding as the first coil group.

[0010] In one embodiment of the stator of the present invention, the multiple segment coils may be connected at the beginning of the winding of the first coil group and the end of the winding of the second coil group, and the first coil group and the second coil group may be connected in series.

[0011] In one embodiment of the stator of the present invention, the multiple segment coils are connected at the beginning of the windings of the first coil group and the beginning of the windings of the second coil group, and connected at the end of the windings of the first coil group and the end of the windings of the second coil group, and the first coil group and the second coil group are connected in parallel.

[0012] In one embodiment of the present invention, the first coil group is divided into a plurality of coil groups, the second coil group is divided into a plurality of coil groups, and the plurality of segment coils are configured such that the starts of the windings of the divided first coil group are connected to each other, the ends of the windings of the divided first coil group are connected to each other, the starts of the windings of the divided second coil group are connected to each other, the ends of the windings of the divided second coil group are connected to each other, the starts of the windings of the divided first coil group and the starts of the windings of the divided second coil group are connected, the ends of the windings of the divided first coil group and the ends of the windings of the divided second coil group are connected, and the divided first coil group and the divided second coil group are connected in multiple parallel configuration.

[0013] A stator according to one aspect of the present invention is a stator for a rotating machine, the number of slots per pole per phase of the rotating machine being q=2. The stator core has a plurality of slots, and a plurality of segment coils made of rectangular wire housed in the plurality of slots. The number of layers of the plurality of slots is N (N is an odd number), the outermost layer of the plurality of slots is the first layer, and the innermost layer of the plurality of slots is the Nth layer. The plurality of segment coils are wound as a first coil group starting from the first layer of a first slot of the plurality of slots, and the first slots are wound in a first coil group. A first step is performed in which a first layer, which is a first layer of a slot, is connected to a second layer, which is a layer adjacent in a positive direction to the first layer of a second slot, which is a first slot pitch number away from the first slot on one side in the circumferential direction, and a second step is performed in which the second layer of the second slot is connected to a third layer, which is a layer adjacent in a positive direction to the second layer of a third slot, which is a second slot pitch number away from the second slot on one side in the circumferential direction, and a third step is performed in which the third layer of the third slot is connected to a third layer of a third slot, which is a third slot pitch number away from the third .... A third step is performed in which a fourth layer, which is a layer adjacent in the positive direction to the third layer of a fourth slot, is connected, and a fourth step is performed in which the fourth layer of the fourth slot is connected to a fifth layer, which is a layer adjacent in the positive direction to the fourth layer of a fifth slot that is a second slot pitch away from the fourth slot on one circumferential side, and the first step, the second step, the third step, and the fourth step are connected in the same connecting manner up to an Nth layer, the slot of the Nth layer being a sixth slot, and a fourth step is performed in which the Nth layer of the sixth slot and the sixth layer are connected to each other as a bridge between the Nth layers. a fifth step is performed in which the Nth layer of the seventh slot, which is the third slot pitch number away on one side of the circumferential direction, is connected to the Nth layer of the seventh slot, and a sixth step is performed in which the Nth layer of the seventh slot is connected to a sixth layer that is a layer adjacent in the negative direction to the Nth layer of the eighth slot, which is the second slot pitch number away on the other side of the circumferential direction from the seventh slot, and a sixth step is performed in which the sixth layer of the eighth slot is connected to a seventh layer that is a layer adjacent in the negative direction to the sixth layer of the ninth slot, which is the third slot pitch number away on the other side of the circumferential direction from the eighth slot,The seventh layer of the ninth slot and on the other circumferential side from the ninth slot, The second slot pitch number A seventh step is performed in which the seventh layer of the tenth slot, which is a layer adjacent in the negative direction, is connected to the eighth layer of the tenth slot, and the eighth layer of the tenth slot and the layer adjacent in the negative direction are connected to the other side of the tenth slot in the circumferential direction. The first slot pitch number An eighth step is performed in which the eighth layer of an eleventh slot, which is spaced apart from the eighth slot by the second slot pitch, is connected to the ninth layer, which is the layer adjacent in the negative direction, and the fifth step, sixth step, seventh step, and eighth step are connected in the same manner up to the first layer, and the slot of the first layer is the twelfth slot. As a transition between first layers, the first layer of the twelfth slot is connected to the first layer of a thirteenth slot, which is spaced apart from the twelfth slot on one side in the circumferential direction by the second slot pitch, and the winding from the first layer of the first slot is repeated from the first layer of the thirteenth slot, and the winding is performed in a wave winding manner so as to connect to the first layer of a fourteenth slot, which is the end of the winding and spaced apart from the first slot on the other side in the circumferential direction by the second slot pitch.

[0014] A rotating machine according to one aspect of the present invention includes the stator according to the above aspect and a rotor.

[0015] A method for manufacturing a stator according to one aspect of the present invention is a method for manufacturing a stator for a rotating machine, the rotating machine having a number of slots per pole per phase q=2, a plurality of segment coils made of rectangular wire housed in a plurality of slots of a stator core, the number of layers of the plurality of slots is N (N is an odd number), an outermost layer of the plurality of slots is a first layer, an innermost layer of the plurality of slots is an Nth layer, the plurality of segment coils are wound as a first coil group starting from a first layer of a first slot of the plurality of slots, and a first coil group is wound on the first layer of the first slot and on one circumferential side of the first slot. Prescribed The layer adjacent to the first layer of the second slot, which is separated by the number of slot pitches, is connected in the positive direction, and the same connection is used to connect up to the Nth layer, and the slot of the Nth layer is the third slot, and as a transition between the Nth layers, the Nth layer of the third slot and the third slot on one side in the circumferential direction are connected. The predetermined The Nth layer of the fourth slot, which is spaced apart by the number of slot pitches, is connected to the Nth layer of the fourth slot and the other side in the circumferential direction from the fourth slot. The predetermined The Nth layer of the fifth slot, which is separated by the number of slot pitches, is connected to the layer adjacent in the negative direction, and the same connection is used to connect up to the first layer. The first layer slot is a sixth slot, and as a transition between the first layers, the first layer of the sixth slot and the sixth slot on one side in the circumferential direction are connected. The predetermined The first layer of the seventh slot, which is separated by the number of slot pitches, is connected to the first layer of the first slot, and the winding from the first layer of the first slot is repeated from the first layer of the seventh slot, and the winding from the first slot to the other circumferential side is The predetermined The wire is wound in a wave manner so that it connects to the eighth slot, which is the end of the winding that is the number of slot pitches away.

[0016] A method for manufacturing a stator according to one aspect of the present invention is a method for manufacturing a stator for a rotating machine, the rotating machine having a per-pole per-phase slot number q=2, a plurality of segment coils made of rectangular wire housed in a plurality of slots of a stator core, the number of layers of the plurality of slots is N (N is an odd number), the outermost layer of the plurality of slots is a first layer, and the innermost layer of the plurality of slots is the Nth layer, the plurality of segment coils are wound as a first coil group starting from the first layer of a first slot of the plurality of slots, and in the first layer of the first slot a first step of connecting a first layer to a second layer which is a layer adjacent in a positive direction to the first layer of a second slot which is a first slot pitch number away from the first slot on one side in the circumferential direction, a second step of connecting the second layer of the second slot to a third layer which is a layer adjacent in a positive direction to the second layer of a third slot which is a second slot pitch number away from the second slot on one side in the circumferential direction, and a third step of connecting the third layer of the third slot to a fourth layer which is a fourth slot pitch number away from the third slot on one side in the circumferential direction. a third step of connecting the third layer to a fourth layer which is a layer adjacent in the positive direction, a fourth step of connecting the fourth layer of the fourth slot to a fifth layer which is a layer adjacent in the positive direction to the fourth layer of a fifth slot which is a second slot pitch number away from the fourth slot on one side in the circumferential direction, the first step, the second step, the third step and the fourth step are connected in the same connecting manner up to an Nth layer, the slot of the Nth layer being a sixth slot, a fifth step of connecting the Nth layer of the seventh slot, which is separated by the third slot pitch number, and connecting the Nth layer of the seventh slot with a sixth layer which is a layer adjacent in the negative direction to the Nth layer of the eighth slot, which is separated by the second slot pitch number on the other circumferential side from the seventh slot; a sixth step of connecting the sixth layer of the eighth slot with a seventh layer which is a layer adjacent in the negative direction to the sixth layer of the ninth slot, which is separated by the third slot pitch number on the other circumferential side from the eighth slot;On the other circumferential side from the ninth slot, The second slot pitch number a seventh step of connecting the seventh layer of the tenth slot, which is a layer adjacent in the negative direction, to an eighth layer of the tenth slot, which is a layer adjacent in the negative direction; and a seventh step of connecting the eighth layer of the tenth slot to the other circumferential side from the tenth slot. The first slot pitch number the eighth step is connected to the eighth layer of an eleventh slot that is spaced apart from the twelfth slot by the second slot pitch number, and the ninth layer is the layer adjacent in the negative direction; the fifth step, the sixth step, the seventh step, and the eighth step are connected in the same manner up to the first layer, the slot of the first layer being a twelfth slot, and the first layer of the twelfth slot is connected to the first layer of a thirteenth slot that is spaced apart from the twelfth slot by the second slot pitch number on one circumferential side as a transition between first layers; and the winding from the first layer of the first slot is repeated from the first layer of the thirteenth slot, and is wound in a wave winding manner so as to connect to the first layer of a fourteenth slot that is the end of the winding and spaced apart from the first slot by the second slot pitch number on the other circumferential side. Effect of the Invention

[0017] According to one aspect of the present invention, the number of turns in a hairpin type stator can be made odd. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic perspective view showing a motor according to a first embodiment of the present invention, with a part cut away; [Diagram 2] 2 is a schematic perspective view showing a stator core and a segment coil. FIG. [Diagram 3] FIG. 2 is a diagram showing an arrangement of segment coils in a stator according to a first embodiment of the present invention, illustrating an example of a U1 phase. [Figure 4] FIG. 2 is a diagram showing the connection of segment coils in the stator according to the first embodiment of the present invention, illustrating an example of a U2 phase. [Diagram 5] FIG. 10 is a diagram showing an arrangement of segment coils in a stator according to Example 4 of the present invention, illustrating an example of a U1 phase. [Figure 6] FIG. 10 is a diagram showing the connection of segment coils in a stator according to Example 4 of the present invention, illustrating an example of a U2 phase. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, in order to make the description easier to understand, structures and elements other than the main parts of the present invention will be described in a simplified or omitted manner. In addition, in the drawings, the same elements are given the same reference numerals. Note that the shapes, dimensions, etc. of each element shown in the drawings are shown diagrammatically and do not represent the actual shapes, dimensions, etc.

[0020] First Embodiment 1 is a schematic perspective view showing a motor according to a first embodiment of the present invention, with a part cut away. The motor 100 is an example of a rotating machine. The motor 100 is, for example, a drive motor for an electric vehicle such as an EV (Electric Vehicle), an HEV (Hybrid Electric Vehicle), or a PHEV (Plug-in Hybrid Electric Vehicle).

[0021] The motor 100 has q=2 slots per pole per phase. The motor 100 includes a housing 101, a rotor 102, and a stator 103. The housing 101 accommodates the rotor 102 and the stator 103. The rotor 102 is disposed with a gap between it and the stator 103. The rotor 102 has a shaft 104. The direction in which the shaft 104 extends is called the axial direction. One axial side of the shaft 104 is supported by a bearing 105, and the other axial side of the shaft 104 is supported by a bearing 106. The central axis of the shaft 104 is the rotation axis of the rotor 102. The direction around the central axis of the shaft 104 is called the circumferential direction. When the shaft 104 is viewed axially from the left side of FIG. 1, the clockwise side is called the one circumferential side, and the counterclockwise side is called the other circumferential side.

[0022] The stator 103 has a stator core 107 and a winding 108. The stator core 107 and the winding 108 will be further described with reference to Fig. 2. The winding 108 is a distributed winding. The stator core 107 has a plurality of slots.

[0023] FIG. 2 is a schematic perspective view showing a stator core and a segment coil. In FIG. 2, the number of slots is 36, but this is an example, and the number of slots may be other numbers as long as the number of slots per pole per phase q=2 is satisfied. A segment coil 110 is inserted into each of the multiple slots of the stator core 107. The stator 103 has multiple segment coils 110. Each of the multiple segment coils 110 has a head 111, a first leg 112 extending to one side of the head 111, and a second leg 113 extending to the other side of the head 111. When referring to either the first leg 112 or the second leg 113, it may be simply called a leg. Each of the multiple segment coils 110 has a hairpin shape. The winding 108 is manufactured by a hairpin type winding method. The winding 108 is formed by inserting a plurality of segment coils 110 into a plurality of slots of the stator core 107 and connecting a first leg 112 and a second leg 113 to form a star connection or a delta connection. The first leg 112 and the second leg 113 may be connected by welding, but may also be connected by a bus bar to reduce the size of the coil end.

[0024] The number of layers, i.e., the number of turns, of the multiple slots is N (N is an odd number). Therefore, the stator 103 of this embodiment has an odd number of turns. In the embodiment of Figures 3 and 4 described below, the number of turns is 7. The outermost layer of the multiple slots is the first layer. In the embodiment of Figures 3 and 4, the outermost layer is assigned layer number 1. The innermost layer of the multiple slots is the Nth layer. In the embodiment of Figures 3 and 4, the innermost layer is assigned layer number 7.

[0025] The plurality of segment coils are wound as a first coil group starting from the first layer in a first slot of the plurality of slots. In the embodiment of FIG. 3, the winding starts from layer number 1 in slot number 1.

[0026] The first layer of the first slot and the layer adjacent in the positive direction to the first layer of the second slot, which is separated from the first slot by the number of slot pitches on one side in the circumferential direction, are connected in the same manner up to the Nth layer. The slot in the Nth layer is the third slot. In the embodiment of FIG. 3, the winding of the stator is composed of windings of U1 phase, U2 phase, V1 phase, V2 phase, W1 phase, and W2 phase, and the number of slot pitches is 6. In the embodiment of FIG. 3, the one side in the circumferential direction is the right side in FIG. 3 (the side where the slot number increases). In the embodiment of FIG. 3, the adjacent in the positive direction is the lower side in FIG. 3 (the side where the layer number increases). In the embodiment of FIG. 3, the layer number 1 of the slot number 1 and the layer number 2 of the slot number 7 are connected in the same manner up to the seventh layer, that is, the layer number 7 of the slot number 37.

[0027] The multiple segment coils are connected between the Nth layers, with the Nth layer of the third slot being connected to the Nth layer of the fourth slot that is separated from the third slot by the number of slot pitches on one side in the circumferential direction. In the embodiment of FIG. 3, layer number 7 of slot number 37 is connected to layer number 7 of slot number 43.

[0028] The multiple segment coils are connected in the same manner up to the first layer, with the Nth layer of the fourth slot being connected to the layer adjacent in the negative direction to the Nth layer of the fifth slot, which is spaced from the fourth slot on the other circumferential side by the number of slot pitches. This first layer slot is the sixth slot. In the embodiment of FIG. 3, the other circumferential side is the left side in FIG. 3 (the side where the slot number decreases). In the embodiment of FIG. 3, adjacent in the negative direction is the upper side in FIG. 3 (the side where the layer number decreases). In the embodiment of FIG. 3, layer number 7 of slot number 43 is connected to layer number 6 of slot number 37, and the same manner is connected up to the first layer, i.e., layer number 1 of slot number 7.

[0029] The first layer of the multiple segment coils is connected between the sixth slot and the seventh slot that is the number of slot pitches away from the third slot on one side in the circumferential direction as a bridge between the first layers. In the example of Fig. 3, layer number 1 of slot number 7 is connected to layer number 1 of slot number 13.

[0030] The multiple segment coils are wound in a wave winding manner such that the winding from the first layer of the first slot is repeated from the first layer of the seventh slot, and connected to the eighth slot, which is the winding end located the number of slot pitches away from the first slot on the other circumferential side. In the embodiment of Fig. 3, the winding from layer number 1 of slot number 1 is repeated from layer number 1 of slot number 13, and connected to layer number 1 of slot number 43, which is the winding end.

[0031] The segment coils are wound as a second coil group starting from the first layer in a first slot of the plurality of slots. In the embodiment of FIG. 4, the winding starts from layer number 1 in slot number 2. EXAMPLES

[0032] Fig. 3 is a diagram showing an arrangement of segment coils in a stator according to Example 1 of the present invention, and is a diagram showing an example of a U1 phase. Fig. 4 is a diagram showing an arrangement of segment coils in a stator according to Example 1 of the present invention, and is a diagram showing an example of a U2 phase.

[0033] In the first embodiment, the number of slots in the stator is 48. The motor to which the stator of the first embodiment is applied has a slot number q=2 per pole per phase. The motor to which the stator of the first embodiment is applied is a motor driven by three-phase AC. The windings of the stator of the first embodiment are composed of windings of U1 phase, U2 phase, V1 phase, V2 phase, W1 phase, and W2 phase. Figures 3 and 4 show only U1 phase and U2 phase. The arrangement and connection of the segment coils of the other phases are similar to those of the U1 phase and U2 phase, so the explanation will be omitted.

[0034] In Figures 3 and 4, the first leg 112 and the second leg 113 of the segment coil 110 shown in Figure 2 are inserted into each layer of each slot. The dashed lines in Figures 3 and 4 indicate connections by the head 111 of the segment coil 110. The solid lines in Figures 3 and 4 indicate connections by welding between the first leg 112 or the second leg 113 of a given segment coil 110 and the first leg 112 or the second leg 113 of another segment coil 110.

[0035] 3 and 4, the multiple slots arranged in the circumferential direction are each assigned a slot number from 1 to 48. Each of the multiple slots has seven layers, and the slot layer numbers from 1 to 7 are assigned in order from the radially outer side to the radially inner side.

[0036] 3, the position where the first leg 112 of the U1-phase segment coil 110 is inserted is indicated by a white circle, and the position where the second leg 113 is inserted is indicated by a black circle. Layer number 1 of slot number 1, which is the start of the wave winding of the segment coil 110, is connected to terminal A. Layer number 1 of slot number 43, which is the end of the wave winding of the segment coil 110, is connected to terminal B. The start and end of the winding are always the outermost layer, making it easy to connect to the neutral point and the UVW terminals.

[0037] When connecting the same layers at the slot ends of layer number 1 or layer number 7, the coils must be shaped to bulge toward the inner diameter (or outer diameter) to avoid interference between the coils. If they bulge toward the inner diameter on the rotor insertion side in the axial direction, the rotor and coil will interfere with each other and rotor insertion will be impossible. Therefore, in this embodiment, the connection between the final layers is made on the head side (opposite rotor insertion side) of the segment coil, so that even if the coil bulges toward the inner diameter, it does not affect rotor insertion. In this embodiment, the jumpers between the seventh layers are placed on the anti-rotor insertion side in the axial direction, and the jumpers between the first layers are placed on the rotor insertion side in the axial direction.

[0038] 4, the position where the first leg 112 of the U2-phase segment coil 110 is inserted is indicated by a white circle, and the position where the second leg 113 is inserted is indicated by a black circle. Layer number 1 of slot number 2, which is the start of the wave winding of the segment coil 110, is connected to terminal C. Layer number 1 of slot number 44, which is the end of the wave winding of the segment coil 110, is connected to terminal D. The start and end of the winding are always the outermost layer, making it easy to connect to the neutral point and the UVW terminals.

[0039] In this embodiment, the U1 phase and the U2 phase are connected in series. That is, terminal A, which is the start of the winding of the segment coil 110 in FIG. 3, is connected to terminal D, which is the end of the winding of the segment coil 110 in FIG. 4. This connection is made, for example, by a welded part having a length of 7-1=6, which is the number of slot pitches minus 1. For example, terminal B in FIG. 3 is connected to the U-phase terminal, and terminal C in FIG. 4 is connected to the neutral point.

[0040] According to this embodiment, the number of turns is an odd number. Also, according to this embodiment, the coils are connected to adjacent layers or to the same layer, so the shape of the coil is simplified and the coil end can be made smaller. EXAMPLES

[0041] In the second embodiment, the U1 phase and the U2 phase are connected in parallel. That is, the terminal A at the beginning of the winding of the segment coil 110 in Fig. 3 is connected to the terminal C at the beginning of the winding of the segment coil 110 in Fig. 4. Also, the terminal B at the end of the winding of the segment coil 110 in Fig. 3 is connected to the terminal D at the end of the winding of the segment coil 110 in Fig. 4. For example, the terminal A in Fig. 3 and the terminal C in Fig. 4 are connected to the U-phase terminal, and the terminal B in Fig. 3 and the terminal D in Fig. 4 are connected to the neutral point. EXAMPLES

[0042] In the third embodiment, in addition to the U1 and U2 phases, new U phases such as U3 and U4 are provided, and the new U phases are connected in parallel with the U1 and U2 phases to realize a multi-parallel connection. This multi-parallel connection may be realized, for example, by dividing the first coil group shown in Fig. 3 and the second coil group shown in Fig. 4.

[0043] 3, the winding starts at slot number 1 and ends at slot number 43. In contrast, in this embodiment, the first coil group is divided. For example, the first coil group is divided into a third coil group (e.g., U1 phase) whose winding starts at slot number 1 and ends at slot number 19, and a fourth coil group (e.g., U2 phase) whose winding starts at slot number 25 and ends at slot number 43.

[0044] 4, the winding starts at slot number 2 and ends at slot number 44. In contrast, in this embodiment, the second coil group is divided. For example, the second coil group is divided into a fifth coil group (e.g., U3 phase) whose winding starts at slot number 2 and ends at slot number 20, and a sixth coil group (e.g., U4 phase) whose winding starts at slot number 26 and ends at slot number 44.

[0045] Furthermore, by connecting slot number 1, slot number 2, slot number 25 and slot number 26 (for example, a U-phase terminal), and connecting slot number 19, slot number 20, slot number 43 and slot number 44 (for example, a neutral point), the third coil group, the fourth coil group, the fifth coil group and the sixth coil group can be connected in parallel, thereby realizing a four-parallel connection.

[0046] In the above example, the first coil group and the second coil group are each divided into two, but they may be divided into other numbers, for example, four. EXAMPLES

[0047] Next, a fourth embodiment will be described with reference to FIGS.

[0048] FIG. 5 is a diagram showing the arrangement of segment coils in a stator according to a fourth embodiment of the present invention, showing an example of a U1 phase. FIG. 6 is a diagram showing the arrangement of segment coils in a stator according to a fourth embodiment of the present invention, showing an example of a U2 phase. This embodiment is an example of 8 poles and 48 slots, and only the U phase is shown. Since the other phases are similar to the U phase, their explanations are omitted. This embodiment will be described in the case of 48 slots and 7 turns, and a U-phase coil. The present invention is not limited to this, and 6 poles and 36 slots or another number of turns (for example, 9 turns) as long as it is an odd number may be used.

[0049] The number of layers, i.e., the number of turns, of the multiple slots is N (N is an odd number). Therefore, the stator 103 of this embodiment has an odd number of turns. In this embodiment, the number of turns is 7. The outermost layer of the multiple slots is the first layer. In this embodiment, the outermost layer is assigned layer number 1. The innermost layer of the multiple slots is the Nth layer. In this embodiment, the innermost layer is assigned layer number 7.

[0050] The plurality of segment coils are wound as a first coil group starting from the first layer in a first slot of the plurality of slots. In this embodiment, the winding starts from layer number 1 in slot number 1.

[0051] The multiple segment coils are connected in the order of a first slot pitch (e.g., 7), a second slot pitch (e.g., 6), a third slot pitch (e.g., 5), and a second slot pitch, repeating this sequence up to the Nth layer. The multiple segment coils are folded back at the Nth layer, and connected in the order of a second slot pitch, a third slot pitch, a first slot pitch, and a second slot pitch, repeating this sequence up to the first layer. This sequence is then repeated.

[0052] In this embodiment, segment coils with 5-slot pitch and 7-slot pitch are wound alternately using a lap winding method and connected using wave winding, with the innermost layer being shaped so that it bulges toward the inner diameter at the head of the segment coil and then folded back, and the outermost layer being shaped so that it bulges toward the outer diameter at the leg of the segment coil and then connected by welding.

[0053] In this embodiment, the segment coils are connected in a wavy pattern as shown in Figures 5 and 6, with the leg side welded at a 6-slot pitch and the head side arranged with alternating 5-slot and 7-slot pitches. The innermost layer on the head side is folded back on the side opposite the rotor insertion side, and the leg side is shaped to bulge toward the outer diameter at the outermost layer and then welded. The U1 phase in Figure 5 and the U2 phase in Figure 6 can be connected in any manner, either in series or parallel.

[0054] In this embodiment, the stator windings are made up of windings of U1, U2, V1, V2, W1, and W2 phases, and the slot pitch numbers are 5 and 7. In this embodiment, one circumferential side is the right side in Figures 5 and 6 (the side where the slot numbers increase). In this embodiment, adjacent in the positive direction is the lower side in Figures 5 and 6 (the side where the layer numbers increase).

[0055] In Figures 5 and 6, the first leg 112 and the second leg 113 of the segment coil 110 shown in Figure 2 are inserted into each layer of each slot. The dashed lines in Figures 5 and 6 indicate connections by the head 111 of the segment coil 110. The solid lines in Figures 5 and 6 indicate connections by welding between the first leg 112 or the second leg 113 of a given segment coil 110 and the first leg 112 or the second leg 113 of another segment coil 110.

[0056] 5 and 6, the multiple slots arranged in the circumferential direction are each assigned a slot number from 1 to 48. Each of the multiple slots has seven layers, and the slot layer numbers from 1 to 7 are assigned in order from the radially outer side to the radially inner side.

[0057] In Figure 5, the position where the first leg 112 of the U1-phase segment coil 110 is inserted is indicated by a white circle, and the position where the second leg 113 is inserted is indicated by a black circle. Layer number 1 of slot number 1, which is the start of the wave winding of the segment coil 110, is connected to the U-phase terminal. Layer number 1 of slot number 43, which is the end of the wave winding of the segment coil 110, is connected to the neutral point. The start and end of the winding are always the outermost layers, making it easy to connect to the neutral point and the UVW terminals.

[0058] In Figure 6, the position where the first leg 112 of the U2-phase segment coil 110 is inserted is indicated by a white circle, and the position where the second leg 113 is inserted is indicated by a black circle. Layer number 1 of slot number 2, which is the start of the wave winding of the segment coil 110, is connected to the U-phase terminal. Layer number 1 of slot number 44, which is the end of the wave winding of the segment coil 110, is connected to the neutral point. The start and end of the winding are always the outermost layers, making it easy to connect to the neutral point and the UVW terminals.

[0059] According to this embodiment, the number of turns is an odd number. Also, according to this embodiment, the coils are connected to adjacent layers or to the same layer, so the shape of the coil is simplified and the coil end can be made smaller.

[0060] In addition, according to this embodiment, the coils with different pitches are arranged alternately, thereby reducing the potential difference between the U1 phase and the U2 phase, and the circulating current. The reduction in the circulating current has the effect of reducing losses, noise, and vibration.

[0061] The present invention is not limited to the above-mentioned embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention. In addition, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0062] 100...motor, 101...housing, 102...rotor, 103...stator, 104...shaft

Claims

1. A stator of a rotating machine, The number of slots per pole per phase of the rotating machine, q=2; The present invention comprises a stator core having a plurality of slots, and a plurality of segment coils which are rectangular wires housed in the plurality of slots, The number of layers of the plurality of slots is N, where N is an odd number; The outermost layer of the plurality of slots is a first layer, The innermost layer of the plurality of slots is an N-th layer, The plurality of segment coils are classified into a first coil group, Winding is started from a first layer in a first slot of the plurality of slots, The first layer of the first slot is connected to a layer adjacent in the positive direction to the first layer of a second slot that is a predetermined number of slot pitches away from the first slot on one side in the circumferential direction, and the same connection method is used to connect up to an Nth layer, the Nth layer being a third slot; As a transition between N-th layers, the N-th layer of the third slot is connected to the N-th layer of the fourth slot that is separated from the third slot by the predetermined number of slot pitches on one circumferential side, The Nth layer of the fourth slot is connected to a layer adjacent in the negative direction to the Nth layer of a fifth slot that is separated from the fourth slot by the predetermined number of slot pitches on the other circumferential side, and is connected to the first layer in the same manner, the first layer being a sixth slot; As a transition between the first layers, the first layer of the sixth slot is connected to the first layer of the seventh slot that is separated from the sixth slot by the predetermined number of slot pitches on one side in the circumferential direction, The winding from the first layer of the first slot is repeated from the first layer of the seventh slot, and is wound in a wave winding manner so as to connect to the first layer of the eighth slot, which is the winding end located a distance of the predetermined number of slot pitches from the first slot on the other circumferential side. Stator.

2. The transition between the Nth layers is disposed on the opposite rotor insertion side in the axial direction, The first layer transition is arranged on the rotor insertion side in the axial direction. The stator according to claim 1 .

3. The plurality of segment coils are wound as a second coil group starting from a ninth slot adjacent to the first layer of the first slot in the positive direction, and are wound with the same wave winding as the first coil group.

3. A stator according to claim 1 or 2.

4. The plurality of segment coils are connected such that the start of the first coil group and the end of the second coil group are connected, and the first coil group and the second coil group are connected in series. The stator according to claim 3 .

5. The plurality of segment coils are connected such that the start of the first coil group is connected to the start of the second coil group, the end of the first coil group is connected to the end of the second coil group, and the first coil group and the second coil group are connected in parallel. The stator according to claim 3 .

6. the first coil group is divided into a plurality of coil groups; the second coil group is divided into a plurality of coil groups; The plurality of segment coils include The winding start portions of the divided first coil group are connected to each other, The ends of the divided first coil groups are connected to each other, The winding start portions of the divided second coil group are connected to each other, The ends of the divided second coil groups are connected to each other, The winding start of the divided first coil group and the winding start of the divided second coil group are connected, The end of the first coil group is connected to the end of the second coil group, The first coil group and the second coil group are connected in parallel to each other. The stator according to claim 3 .

7. A stator of a rotating machine, The number of slots per pole per phase of the rotating machine, q=2; The present invention comprises a stator core having a plurality of slots, and a plurality of segment coils which are rectangular wires housed in the plurality of slots, The number of layers of the plurality of slots is N, where N is an odd number; The outermost layer of the plurality of slots is a first layer, The innermost layer of the plurality of slots is an N-th layer, The plurality of segment coils are classified into a first coil group, Winding is started from a first layer in a first slot of the plurality of slots, a first step is performed in which a first layer, which is a first layer of the first slot, and a second layer, which is a layer adjacent to the first layer in a positive direction of a second slot that is a first slot pitch away from the first slot on one side in the circumferential direction, are connected; a second step is performed in which the second layer of the second slot is connected to a third layer of a third slot that is a layer adjacent to the second layer in a positive direction and is located a second slot pitch away from the second slot on one circumferential side; a third step is performed in which the third layer of the third slot is connected to a fourth layer of a fourth slot that is a layer adjacent to the third layer in a positive direction and is spaced from the third slot by the third slot pitch number on one circumferential side; a fourth step is performed in which the fourth layer of the fourth slot is joined to a fifth layer that is a layer adjacent to the fourth layer in a positive direction of a fifth slot that is a second slot pitch away from the fourth slot on one circumferential side; The first procedure, the second procedure, the third procedure, and the fourth procedure are connected in the same manner up to an N-th layer, and the N-th layer slot is a sixth slot; As a transition between N-th layers, the N-th layer of the sixth slot is connected to the N-th layer of the seventh slot that is separated from the sixth slot by the third slot pitch number on one circumferential side, a fifth step is performed in which the Nth layer of the seventh slot is connected to a sixth layer, which is a layer adjacent in the negative direction to the Nth layer of an eighth slot that is spaced from the seventh slot by the second slot pitch number on the other circumferential side; a sixth step is performed in which the sixth layer of the eighth slot is connected to a seventh layer, which is a layer adjacent to the sixth layer of a ninth slot that is separated from the eighth slot by the third slot pitch number on the other circumferential side, in a negative direction; a seventh step is performed in which the seventh layer of the ninth slot is connected to an eighth layer, which is a layer adjacent to the seventh layer in the negative direction of a tenth slot that is spaced from the ninth slot by the second slot pitch number on the other circumferential side; an eighth step is performed in which the eighth layer of the tenth slot is connected to a ninth layer, which is a layer adjacent to the eighth layer of an eleventh slot that is spaced from the tenth slot by the first slot pitch number on the other circumferential side, in a negative direction; The fifth step, the sixth step, the seventh step, and the eighth step are connected in the same manner up to the first layer, and the slot of the first layer is the twelfth slot; As a transition between first layers, the first layer of the twelfth slot is connected to the first layer of a thirteenth slot that is spaced from the twelfth slot on one circumferential side by the second slot pitch number, The winding from the first layer of the first slot is repeated from the first layer of the thirteenth slot, and is wound in a wave winding manner so as to connect to the first layer of the fourteenth slot, which is the winding end located a distance of the second slot pitch number from the first slot on the other circumferential side. Stator.

8. A rotating machine comprising the stator according to any one of claims 1 to 7 and a rotor.

9. A method for manufacturing a stator of a rotating machine, comprising the steps of: The number of slots per pole per phase of the rotating machine, q=2; A plurality of segment coils made of rectangular wire are housed in a plurality of slots of the stator core, The number of layers of the plurality of slots is N, where N is an odd number; The outermost layer of the plurality of slots is a first layer, The innermost layer of the plurality of slots is an N-th layer, The plurality of segment coils are classified into a first coil group, Winding is started from a first layer in a first slot of the plurality of slots; A first layer of the first slot is connected to a layer adjacent in a positive direction to a first layer of a second slot that is a predetermined number of slot pitches away from the first slot on one side in the circumferential direction, and the same connection method is used to connect up to an Nth layer, the Nth layer being a third slot; As a transition between N-th layers, the N-th layer of the third slot is connected to the N-th layer of a fourth slot that is separated from the third slot by the predetermined number of slot pitches on one circumferential side, The Nth layer of the fourth slot is connected to a layer adjacent in the negative direction to the Nth layer of a fifth slot that is separated from the fourth slot by the predetermined number of slot pitches on the other circumferential side, and the same connection method is used to connect the layers up to the first layer, the first layer being a sixth slot; As a transition between first layers, the first layer of the sixth slot is connected to the first layer of a seventh slot that is spaced from the sixth slot by the predetermined number of slot pitches on one side in the circumferential direction, The winding from the first layer of the first slot is repeated from the first layer of the seventh slot, and the winding is performed in a wave winding manner so as to connect from the first slot to an eighth slot, which is the winding end located a distance of the predetermined number of slot pitches on the other circumferential side. A method for manufacturing a stator.

10. A method for manufacturing a stator of a rotating machine, comprising the steps of: The number of slots per pole per phase of the rotating machine, q=2; A plurality of segment coils made of rectangular wire are housed in a plurality of slots of the stator core, The number of layers of the plurality of slots is N, where N is an odd number; The outermost layer of the plurality of slots is a first layer, The innermost layer of the plurality of slots is an N-th layer, The plurality of segment coils are classified into a first coil group, Winding is started from a first layer in a first slot of the plurality of slots; a first step of connecting a first layer, which is a first layer of the first slot, to a second layer, which is a layer adjacent to the first layer in a positive direction of a second slot, which is a first slot pitch away from the first slot on one side in the circumferential direction; a second step of connecting the second layer of the second slot with a third layer of a third slot that is a layer adjacent to the second layer in a positive direction and that is a layer that is a second slot pitch away from the second slot on one circumferential side, a third step of connecting the third layer of the third slot with a fourth layer that is a layer adjacent to the third layer in a positive direction of a fourth slot that is a third slot pitch away from the third slot on one circumferential side, a fourth step of connecting the fourth layer of the fourth slot with a fifth layer that is a layer adjacent in a positive direction to the fourth layer of a fifth slot that is a second slot pitch away from the fourth slot on one circumferential side, The first procedure, the second procedure, the third procedure, and the fourth procedure are connected in the same manner up to an N-th layer, and the N-th layer slot is a sixth slot; As a transition between N-th layers, the N-th layer of the sixth slot is connected to the N-th layer of the seventh slot that is separated from the sixth slot by the third slot pitch number on one circumferential side, a fifth step of connecting the Nth layer of the seventh slot to a sixth layer which is a layer adjacent in a negative direction to the Nth layer of an eighth slot which is spaced from the seventh slot by the second slot pitch number on the other circumferential side, a sixth step of connecting the sixth layer of the eighth slot to a seventh layer, the seventh layer being a layer adjacent to the sixth layer of a ninth slot that is spaced from the eighth slot by the third slot pitch number on the other circumferential side, in a negative direction; a seventh step of connecting the seventh layer of the ninth slot with an eighth layer, which is a layer adjacent to the seventh layer of a tenth slot that is spaced from the ninth slot by the second slot pitch number on the other circumferential side, in a negative direction; an eighth step of connecting the eighth layer of the tenth slot with a ninth layer, which is a layer adjacent to the eighth layer of an eleventh slot that is spaced from the tenth slot by the first slot pitch number on the other circumferential side, in a negative direction; The fifth step, the sixth step, the seventh step, and the eighth step are connected in the same manner up to the first layer, and the slot of the first layer is the twelfth slot; As a transition between first layers, the first layer of the twelfth slot is connected to the first layer of a thirteenth slot that is spaced from the twelfth slot by the second slot pitch number on one circumferential side, The winding from the first layer of the first slot is repeated from the first layer of the thirteenth slot, and is wound in a wave winding manner so as to connect to the first layer of the fourteenth slot, which is the winding end located a distance of the second slot pitch number from the first slot on the other circumferential side. A method for manufacturing a stator.

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