JP2023003090A - Rotary electric machine stator - Google Patents

Abstract

To reduce the number of assembly times while reducing spatial harmonics.SOLUTION: A rotary electric machine stator includes a stator core, and a stator coil in which a plurality of triple-wound coils concentrically including three coil portions in a closed coil shape when viewed in the radial direction are wound around the stator core for each phase. Each of the three coil portions in one triple-wound coil forms a closed coil shape by slot insertion portions on both sides in the circumferential direction, and transition portions on both sides in the axial direction, and the three coil portions include a first coil portion having the longest circumference, a second coil portion having a circumference shorter than that of the first coil portion by a pitch of four slots, and a third coil portion having a circumference shorter than that of the first coil portion by a pitch of two slots, and the plurality of triple-wound coils are inserted into respective corresponding slots in such a manner in which the first coil portions are radially adjacent and the second coil portions are radially adjacent.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a stator for rotating electrical machines.

2. Description of the Related Art A stator for a rotating electric machine is known in which a plurality of coil wires of different phases are arranged to overlap in a circumferential direction in some of a plurality of slots.

JP 2018-182963 A

By the way, when a plurality of double-wound coils having two concentric coil portions with different circumferences are used and attached to the stator core by double-layer winding to reduce spatial harmonics, a normal single-wound coil is used. Although the number of times of assembly can be reduced compared to the case, the number of times of assembly still tends to be relatively large.

Accordingly, in one aspect, an object of the present disclosure is to reduce the number of times of assembly while reducing spatial harmonics.

In one aspect, a stator core having a plurality of slots;
a stator coil formed by winding a plurality of triple-wound coils concentrically including three coil portions having a coil shape closed in the radial direction around the entire circumference of the stator core for each phase. ,
The three coil portions in one triple-wound coil include slot insertion portions on both sides in the circumferential direction that are inserted into different slots, and axially opposite sides extending in the circumferential direction between the slot insertion portions on both sides in the circumferential direction. The transition portion forms the closed coil shape,
The three coil portions are: a first coil portion having the longest circumference; a second coil portion having a circumference shorter than the first coil portion by a pitch of four slots; consists of a third coil portion that is shorter by a pitch of two slots,
In the plurality of triple wound coils, the slot insertion portion of the first coil portion and the slot insertion portion of the second coil portion of one of the triple wound coils are the slots of the first coil portion of the other triple wound coil. A stator for a rotating electric machine is provided, which is inserted into each corresponding slot in a manner radially adjacent to the insertion portion and the slot insertion portion of the second coil portion.

In one aspect, according to the present disclosure, it is possible to reduce the number of times of assembly while reducing spatial harmonics.

FIG. 2 is a plan view of the stator of the rotary electric machine according to the embodiment; FIG. 4 is an explanatory diagram of the configuration in the slots of the stator coil of the embodiment; FIG. 10 is an explanatory diagram of a configuration inside a slot by ordinary two-layer winding; It is a figure which shows an example of the whole stator coil structure of a present Example. It is a figure which shows another example of the whole stator coil structure of a present Example. FIG. 4 is an explanatory diagram of a preferred example of a triple wound coil; FIG. 11 is an explanatory diagram of a triple wound coil according to another example; FIG. 10 is an explanatory diagram of a configuration in which the number of slot insertion portions inserted into slots is an odd number; FIG. 4 is a plan view of a workpiece at one stage of assembly in the manufacturing method according to the present embodiment; FIG. 10 is a plan view of the work in another assembly stage in the manufacturing method according to the present embodiment; FIG. 10 is a plan view of the work in another assembly stage in the manufacturing method according to the present embodiment;

Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples, and the present invention is not limited to these, and shapes and the like in the drawings may be partially exaggerated for convenience of explanation.

FIG. 1 is a plan view of a stator 10 of a rotary electric machine according to this embodiment. In the following description, the axial direction refers to the direction in which the rotation axis (rotation center) I of the rotating electric machine extends, and the radial direction refers to the radial direction around the rotation axis I. Therefore, the radially outer side refers to the side away from the rotation axis I, and the radially inner side refers to the side toward the rotation axis I. Moreover, the circumferential direction corresponds to the direction of rotation about the rotation axis I. As shown in FIG. In addition, in FIG. 1 and the like, for ease of viewing, only a part of a plurality of parts having the same attribute may be given reference numerals.

FIG. 1 shows the stator 10 viewed along the axial direction. In addition, in FIG. 1 (the same applies to FIG. 2A and the like described later), the coil portion (slot insertion portion) inserted in the slot 15 is indicated by ◯, and the coil portion serving as the connecting wire is schematically indicated by hatching. It is

The rotating electrical machine is of the inner rotor type, and the stator 10 is provided so as to surround the radially outer side of a rotor (not shown). The rotating electric machine may be, for example, a vehicle drive motor used in a hybrid vehicle or an electric vehicle. However, the rotating electric machine may be used for any other purpose.

The stator 10 includes a stator core 11 and stator coils 12 .

The stator core 11 may be formed of, for example, an annular magnetic laminated steel plate. Teeth 14 protruding radially inward are radially formed on the inner peripheral portion of the stator core 11 . The multiple teeth 14 define multiple slots 15 between adjacent teeth 14 in the circumferential direction. Although the number of teeth 14 and slots 15 associated therewith is arbitrary, in this embodiment, 36 are provided as an example. In FIG. 1, numbers from 1 to 36 are shown in circles in association with the 36 slots 15 . In the following description, a specific slot 15 is represented by slot 15-k (k=1 to 36). For example, slot 15-1 represents slot 15 associated with a circle containing the number "1". Also, hereinafter, such "k" is also referred to as a slot number. In this embodiment, as an example, the rotary electric machine has three phases, six poles, and 36 slots, but these numbers may be changed as appropriate. In the case of 3-phase, 6-pole, and 36 slots, 6 slots are the coil pitch for full-pitch winding. becomes a pitch.

The stator coil 12 is wound around the teeth 14 of the stator core 11 (that is, inside the slots 15). The stator coil 12 is wound around the stator core 11 so as to have the same in-slot configuration as the two-layer winding. The stator coils 12 may be electrically connected at the neutral point of the Y-connection in one or more parallel relationships (see FIGS. 3 and 4), or may be electrically connected in the Δ-connection. may

In the double-layer winding, the change (distribution) of the magnetomotive force according to the change in the angle can be made relatively gentle (because the waveform of the magnetomotive force can be made closer to a sine wave), so the spatial harmonics can be reduced. can. That is, NV (Noise Vibration) performance is improved. In the present embodiment, as will be described later with reference to FIGS. 2A and 2B, triple winding coils 121U, 121V, and 121W are used to achieve the same slot configuration as double-layer winding, so spatial harmonics can be reduced. .

In this embodiment, the stator coils 12 are concentrically arranged for each of the U phase (an example of the first phase), the V phase (an example of the second phase), and the W phase (an example of the third phase). It is formed by triple winding coils 121U, 121V, and 121W wound with different circumference lengths. The triple winding coil 121U is for the U phase, and three are provided in this embodiment. Similarly, three triple winding coils 121V are provided for the V phase, and three triple winding coils 121W are provided for the W phase. In the following description, the triple coils 121U, 121V, and 121W are simply referred to as "triple coil 121" when the respective phases are not distinguished. Further, in the following description, the outer side in the circumferential direction refers to the side away from the center of the triple coil 121 in the circumferential direction, and the inner side in the circumferential direction refers to the side closer to the center. In addition, the axially outer side refers to the side away from the axial center of one triple-wound coil 121, and the axially inner side refers to the side closer to the center.

One triple-wound coil 121 includes three concentric coil portions that are substantially hexagonal when viewed in the radial direction. The longer coil portion is hereinafter also referred to as "outer cassette coil portion CL1", the coil portion with the shortest circumference is hereinafter also referred to as "inner cassette coil portion CL2", and the coil portion with an intermediate circumference is referred to as "inner cassette coil portion CL2". , hereinafter also referred to as "intermediate cassette coil portion CL3". A preferred example of the triple winding coil 121 will be described later with reference to FIGS. 5 and 6. FIG.

One triple wound coil 121 is inserted into six slots 15 . That is, the outer cassette coil portion CL1 is inserted into two slots 15, the inner cassette coil portion CL2 is inserted into another two slots 15, and the middle cassette coil portion CL3 is inserted into another two slots 15. At this time, the slot 15 into which the outer cassette coil portion CL1 is inserted is adjacent to the slot 15 into which the intermediate cassette coil portion CL3 is inserted, and the slot 15 into which the inner cassette coil portion CL2 is inserted is adjacent to the slot 15 in the circumferential direction. Circumferentially inwardly adjacent to the slot 15 into which the intermediate cassette coil portion CL3 is inserted. Therefore, the inner cassette coil portion CL2 is shorter than the outer cassette coil portion CL1 by a pitch of 4 slots, and the middle cassette coil portion CL3 is shorter than the outer cassette coil portion CL1 by a pitch of 2 slots. It should be noted that "shorter by a pitch of 4 slots or 2 slots" does not represent a difference in length as a strict numerical value, but represents the positional relationship of the slots 15 into which the respective coil portions are inserted. be.

Specifically, the outer cassette coil portion CL1 of one triple wound coil 121 is inserted into the pair of slots 15 on the circumferential outer side, and the inner cassette coil portion CL2 of the same triple wound coil 121 is inserted on the circumferential inner side. The middle cassette coil portion CL3 of the same triple-wound coil 121 is inserted into the pair of slots 15 (hereinafter also referred to as "circumferential middle") between them. In this case, the circumferentially outer pair of slots 15 sandwich seven slots 15 in the circumferential direction (ie, the outer cassette coil portion CL1 is a long pitch winding). That is, the outer cassette coil portion CL1 of one triple wound coil 121 is arranged over nine slots 15 in the circumferential direction. Also, the pair of slots 15 on the inner side in the circumferential direction sandwiches three slots 15 in the circumferential direction (that is, the inner cassette coil portion CL2 is short-pitch winding). That is, the inner cassette coil portion CL2 of one triple wound coil 121 is arranged over five slots 15 in the circumferential direction. Also, the pair of slots 15 in the middle in the circumferential direction sandwich five slots 15 in the circumferential direction (that is, the middle cassette coil portion CL3 is a long pitch winding). That is, the intermediate cassette coil portion CL3 of one triple winding coil 121 is arranged over seven slots 15 in the circumferential direction.

For example, of the three triple coils 121U, one triple coil 121U associated with a star mark in FIG. 9, the inner cassette coil portion CL2 is inserted into the circumferentially inner pair of slots 15-3, 15-7, and the middle cassette coil portion CL3 is inserted into the circumferentially middle pair of slots 15-2, 15-8. inserted. In this case, the circumferential centers of the circumferentially outer pair of slots 15-1 and 15-9, the circumferential centers of the circumferentially inner pair of slots 15-3 and 15-7, and the circumferentially middle pair of slots The centers of the slots 15-2 and 15-8 in the circumferential direction coincide with each other, and the center is the position of the slot 15-5. The above is basically the same for the other triple winding coil 121U and the respective triple winding coils 121V and 121W. That is, each of the triple winding coils 121U, 121V, and 121W is arranged in such a manner that the U-phase, V-phase, and W-phase are shifted in the circumferential direction by 120° in electrical angle. be.

Such a triple-wound coil 121 can be easily assembled in the corresponding slot 15 along the radial direction, for example, from the radially inner side to the radially outer side using a jig (cassette inserter). In this case, the assembling of three ordinary cassette coils can be achieved by assembling one triple wound coil 121, so that the efficiency of assembling can be improved.

Alternatively, in this embodiment, the triple wound coil 121 can be assembled from the axial direction using an inserter. In this embodiment, as shown in FIG. 1, the three U-phase triple coils 121U are arranged radially outermost, and the W-phase three triple coils 121W are arranged radially innermost. The three V-phase triple coils 121V are arranged radially between the U-phase three triple coils 121U and the W-phase triple coils 121W. Therefore, the three triple coils 121U for the U phase, the three triple coils 121V for the V phase, and the three triple coils 121W for the W phase can be arranged without crossing each other in the radial direction. As a result, the three triple coils 121U for the U phase are assembled to the stator core 11 at the same time, the three triple coils 121V for the V phase are assembled to the stator core 11 at the same time, and then the three triple coils for the W phase are assembled. An assembling method such as assembling 121W to the stator core 11 at the same time becomes possible, and the assembling property is improved. As described above, this embodiment has a unique effect in terms of ease of assembly, and this point will be described in detail with reference to FIG. 8 and subsequent figures.

Next, the configuration of the stator coil 12 will be described in more detail with reference to FIG. 2A and subsequent figures together with FIG.

FIG. 2A is an explanatory view of the configuration inside the slots of the stator coil 12 of this embodiment, and FIG. 2A is a simplified cross-sectional view of a part of the stator 10. FIG. FIG. 2B is an explanatory diagram of an internal configuration of a slot by ordinary two-layer winding as a comparative example.

As shown in FIG. 2A, one triple wound coil 121U and another one triple wound coil 121W are inserted into the slot 15-7, and only one triple wound coil 121U is inserted into the slot 15-8. One triple wound coil 121V and another one triple wound coil 121U are inserted into the slot 15-9, and only one triple wound coil 121V is inserted into the slot 15-10. It is the same. With such an internal slot configuration, the same internal slot configuration as in the case of the normal two-layer winding shown in FIG. 2B can be realized, so that spatial harmonics can be effectively reduced. In the case of the typical two-layer winding slot configuration shown in FIG. 2B, slot insertion portions of two different cassette coils are inserted into each slot so as to be radially adjacent to each other. For example, in FIG. 2B, in the slot 15-7, the slot insertion portion of one cassette coil 121U' related to the U phase and the slot insertion portion of one cassette coil 121W' related to the W phase are radially adjacent to each other. In the slot 15-8, the slot insertion portion of the one cassette coil 121U' related to the U phase and the slot insertion portion of the other one cassette coil 121U' related to the U phase are are inserted radially adjacent to each other.

3 and 4 are diagrams showing two examples of the overall configuration of the stator coil 12 of this embodiment.

In the example shown in FIG. 3, the stator coils 12 are electrically connected at the neutral point 90N of the Y-connection in a parallel relationship of three sets for each phase. Specifically, the stator coil 12 includes a U-phase first triple coil 121U-1, a U-phase second triple coil 121U-2, and a U-phase third triple coil 121U-3. are electrically connected in parallel between the neutral point 90N and the U-phase terminal 90U on the power line side. The same applies to the other phases, and the stator coil 12 includes a V-phase first triple coil 121V-1, a V-phase second triple coil 121V-2, and a V-phase third triple coil 121V-2. Three sets (pairs) of wound coils 121V-3 are electrically connected in parallel between the neutral point 90N and the V-phase terminal 90V on the power line side. The stator coil 12 includes three sets of a W-phase first triple coil 121W-1, a W-phase second triple coil 121W-2, and a W-phase third triple coil 121W-3. (pair) are electrically connected in parallel between the neutral point 90N and the W-phase terminal 90W on the power line side.

In the example shown in FIG. 4, the stator coils 12 are electrically connected in a series relationship for each phase at the neutral point 90N of the Y connection. Specifically, the stator coil 12 includes a U-phase first triple coil 121U-1, a U-phase second triple coil 121U-2, and a U-phase third triple coil 121U-3. are electrically connected between the neutral point 90N and the U-phase terminal 90U on the power line side in a state of being connected in series. The same applies to other phases.

Next, a preferred example of the triple winding coil 121 will be described with reference to FIGS. 5 and 6. FIG.

FIG. 5 is an explanatory diagram of an example of the configuration of the triple winding coil 121, and is a schematic plan view viewed in the radial direction. One triple-wound coil 121 will be described below, but the other triple-wound coils 121 are substantially the same as described above.

In the example shown in FIG. 5, the triple winding coil 121 includes a first slot insertion portion 1211, a second slot insertion portion 1212, a third slot insertion portion 1213, a fourth slot insertion portion 1214, first and second It includes transition portions 1215A and 1215B, third and fourth transition portions 1216A and 1216B, a connection portion 1217 for switching, and ends 1210 and 1218. FIG. Moreover, the triple winding coil 121 further includes a fifth slot insertion portion 1220, a sixth slot insertion portion 1222, fifth and sixth transition portions 1224A and 1224B, and a connection portion 1225 for switching.

The triple wound coil 121 is one piece from end 1210 to end 1218, and may be formed by winding one or more coil wires (having a circular or rectangular cross section) around a bobbin one or more times. The number of slot insertion portions (N, N−1, etc.) described below corresponds to the number of coil wires. In FIG. 5, thick lines indicate a state in which the number is two or more. Also, the ends 1210, 1218 may be bent from a straight configuration as shown.

The first slot insertion portion 1211, the second slot insertion portion 1212, the third slot insertion portion 1213, the fourth slot insertion portion 1214, the fifth slot insertion portion 1220, and the sixth slot insertion portion 1222 are each inserted into the slot 15. It is the part of the coil piece that is Regarding one triple winding coil 121, the first slot insertion portion 1211, the second slot insertion portion 1212, the third slot insertion portion 1213, the fourth slot insertion portion 1214, the fifth slot insertion portion 1220, and the sixth slot insertion The slots 15 into which the portions 1222 are inserted are different from each other.

In this embodiment, as described above, for one triple winding coil 121, the center between the pair of slots 15 (long-pitch winding slots) into which the first slot insertion portion 1211 and the fourth slot insertion portion 1214 are inserted , the center between the pair of slots 15 (short-pitch winding slots) into which the second slot insertion portion 1212 and the third slot insertion portion 1213 are inserted, and the fifth slot insertion portion 1220 and the sixth slot insertion portion 1222. The center between a pair of inserted slots 15 (long-pitch winding slots) coincides. Further, regarding one triple winding coil 121, the slot 15 (long pitch winding slot) into which the first slot insertion portion 1211 is inserted and the slot 15 (short pitch winding slot) into which the second slot insertion portion 1212 is inserted. are adjacent in the circumferential direction via the slot 15 (long-pitch winding slot) into which the fifth slot insertion portion 1220 is inserted, and the slot 15 (long-pitch winding slot) into which the fourth slot insertion portion 1214 is inserted. ) and the slot 15 (short-pitch winding slot) into which the third slot insertion portion 1213 is inserted are adjacent in the circumferential direction via the slot 15 (long-pitch winding slot) into which the sixth slot insertion portion 1222 is inserted. become a compatible relationship. In this case, the first slot insertion portion 1211 and the fourth slot insertion portion 1214 together with the first and second transition portions 1215A and 1215B form the outer cassette coil portion CL1, and the second slot insertion portion 1212 and the fourth slot insertion portion 1214 form the outer cassette coil portion CL1. The third slot insertion portion 1213 forms the inner cassette coil portion CL2 described above together with the third and fourth transition portions 1216A and 1216B, and the fifth slot insertion portion 1220 and the sixth slot insertion portion 1222 form the fifth and fourth transition portions CL2. Together with the six transition portions 1224A and 1224B, they form the intermediate cassette coil portion CL3 described above.

The first transition portion 1215A forms a coil end on the lead side. The first bridge portion 1215A has one circumferential side connected to the lead-side end of the first slot insertion portion 1211 and the other circumferential side connected to the lead-side end of the fourth slot insertion portion 1214 .

The second bridge portion 1215B forms a coil end on the side opposite to the lead. The second bridge portion 1215B has one circumferential side connected to the end of the first slot insertion portion 1211 opposite to the lead, and the other circumferential side connected to the end of the fourth slot insertion portion 1214 opposite to the lead. be.

The third transition portion 1216A forms a coil end on the lead side. The third bridging portion 1216A has one circumferential side connected to the lead-side end of the second slot insertion portion 1212 and the other circumferential side connected to the lead-side end of the third slot insertion portion 1213 .

The fourth bridge portion 1216B forms a coil end on the side opposite to the lead. One circumferential side of the fourth bridge portion 1216B is connected to the end of the second slot insertion portion 1212 opposite to the lead, and the other circumferential side is connected to the end of the third slot insertion portion 1213 opposite to the lead. be.

The fifth transition portion 1224A forms a coil end on the lead side. The fifth bridge portion 1224A has one circumferential side connected to the lead-side end of the fifth slot insertion portion 1220 and the other circumferential side connected to the lead-side end of the sixth slot insertion portion 1222 .

The sixth transition portion 1224B forms a coil end on the side opposite to the lead. One circumferential side of the sixth bridge portion 1224B is connected to the end of the fifth slot insertion portion 1220 opposite to the lead, and the other circumferential side is connected to the end of the sixth slot insertion portion 1222 opposite to the lead. be.

A switching connection 1217 forms a connection between the inner cassette coil portion CL2 and the middle cassette coil portion CL3. Specifically, the connection portion 1217 for switching extends in the circumferential direction, and the inner end portion in the circumferential direction connects to the end portion on the side opposite to the lead of the one third slot insertion portion 1213 via the fourth transition portion 1216B. , and the outer end in the circumferential direction is connected to the end of one fifth slot insertion portion 1220 opposite to the lead.

A switching connection 1225 forms a connection between the middle cassette coil portion CL3 and the outer cassette coil portion CL1. Specifically, the switching connection portion 1225 extends in the axial direction, and the axially inner end portion is connected to the end portion of the sixth slot insertion portion 1222 opposite to the lead. The axially outer end of the switching connection portion 1225 is connected to the end of the first slot insertion portion 1211 on the side opposite to the lead via the second transition portion 1215B.

Here, when forming the triple winding coil 121 having N first slot insertion portions 1211 as described above, from the end portion 1210, the third slot insertion portion 1213, the fourth transition portion 1216B, the second slot insertion portion A portion 1212, a third transition portion 1216A, a third slot insertion portion 1213, a fourth transition portion 1216B, and so on until N pieces of the third slot insertion portion 1213 and the fourth transition portion 1216B are formed. Then, when the N-th fourth bridge portion 1216B is formed, the connection portion 1217 for switching is formed from the N-th fourth bridge portion 1216B, and then the fifth slot insertion portion 1220 and the fifth bridge portion are formed. 1224A, sixth slot insertion portion 1222, and sixth bridge portion 1224B, and so on until 2N-1 fifth slot insertion portions 1220 and sixth slot insertion portions 1222 are formed. Then, when the 2N-1 sixth slot insertion portion 1222 is formed, a connection portion 1225 for switching is formed from the 2N-1 sixth slot insertion portion 1222, and then similarly, the second slot insertion portion 1222 is formed. Transfer portion 1215B, first slot insertion portion 1211, first transfer portion 1215A, fourth slot insertion portion 1214, second transfer portion 1215B, first slot insertion portion 1211, first transfer portion 1215A, fourth slot insertion portion 1214, Second bridging portion 1215B, and so on until N second bridging portions 1215B are formed. Then, when the N-th second bridge portion 1215B is formed, the N-th first slot insertion portion 1211 is formed, and then the end portion 1218 is formed.

According to such a triple winding coil 121, the stator coil 12 described above can be configured by assembling a plurality of the same type. That is, the stator coil 12 described above can be configured using nine triple winding coils 121 shown in FIG. The same type means that the configurations from the first slot insertion portion 1211 to the sixth slot insertion portion 1222 are substantially the same, and the lengths and bending shapes of the ends 1210 and 1218 are slightly different. It is a concept that also includes

Specifically, when the triple winding coil 121 shown in FIG. 5 is used, the first slot insertion portion 1211 for the U phase is located radially outside the fourth slot insertion portion 1214 for the W phase. It is inserted into the same slot 15 as the fourth slot insertion portion 1214 relating to the W phase. The second slot insertion portion 1212 for the U phase is located radially outside the third slot insertion portion 1213 for the V phase, and is arranged in the same slot as the third slot insertion portion 1213 for the V phase. . The third slot insertion portion 1213 related to the U phase is arranged in the same slot as the second slot insertion portion 1212 related to the W phase, in a manner positioned radially outside the second slot insertion portion 1212 related to the W phase. . The fourth slot insertion portion 1214 for the U phase is positioned radially outside the first slot insertion portion 1211 for the V phase, and is inserted into the same slot 15 as the first slot insertion portion 1211 for the V phase. be done. The fifth slot insertion portion 1220 for the U phase is inserted into the slot 15 alone, and the sixth slot insertion portion 1222 for the U phase is inserted into the slot 15 alone.

Similarly, the second slot insertion portion 1212 for the V phase is located radially outside the third slot insertion portion 1213 for the W phase, and is the same as the third slot insertion portion 1213 for the W phase. placed in the slot. The fourth slot insertion portion 1214 for the V phase is positioned radially outside the first slot insertion portion 1211 for the W phase, and is inserted into the same slot 15 as the first slot insertion portion 1211 for the W phase. be done. The fifth slot insertion portion 1220 for the V phase is inserted into the slot 15 alone, and the sixth slot insertion portion 1222 for the V phase is inserted into the slot 15 alone.

Similarly, the W-phase fifth slot insertion portion 1220 is inserted into the slot 15 alone, and the W-phase sixth slot insertion portion 1222 is inserted into the slot 15 alone.

Further, according to the triple winding coil 121 as described above, while the number of the fifth slot insertion portions 1220 and the number of the sixth slot insertion portions 1222 are the same, the number of the first slot insertion portions 1211 and the fourth slot insertion portions 1214 are respectively can be made different by one, and the number of each of the second slot insertion portion 1212 and the third slot insertion portion 1213 can be made different by one. That is, if the number of first slot insertion portions 1211 is N (≧2), then the number of fourth slot insertion portions 1214 is N−1, the number of second slot insertion portions 1212 is N−1, and the number of third slot insertion portions is N−1. 1213 can be N pieces. In addition, although the number of each of the fifth slot insertion portion 1220 and the sixth slot insertion portion 1222 does not depend on the number of the first slot insertion portions 1211, it can be set to 2N-1 as in the present embodiment. can. Note that the switching connection section 1217 is connected to one of the 2N-1 fifth slot insertion sections 1220, and is connected to one of the N third slot insertion sections 1213 for the fourth transition. 1216B. In addition, the connection unit 1225 for switching is connected to one of the 2N-1 sixth slot insertion units 1222, and is connected to one of the N first slot insertion units 1211 for the second transition. 1215B. Similarly, the ends 1210 and 1218 are connected to one of the N third slot inserts 1213 and one of the N first slot inserts 1211, respectively. Note that, in a modified example, the switching connection portion 1217 may be connected to the end of the one fifth slot insertion portion 1220 opposite to the lead via a part of the sixth transition portion 1224B.

Therefore, in this embodiment, the total number of coils inserted into the corresponding slots 15 is the same for the outer cassette coil portion CL1 and the inner cassette coil portion CL2. That is, if the number of first slot insertion sections 1211 is N (≧2), the sum of the number of first slot insertion sections 1211 and fourth slot insertion sections 1214 is 2N−1, and the second slot insertion section The sum of the numbers of the portion 1212 and the third slot insertion portion 1213 is 2N-1, which is the same. Also, the total number of coils inserted into the slots 15 corresponding to the middle cassette coil portion CL3 is the same as that of each of the outer cassette coil portion CL1 and the inner cassette coil portion CL2. In other words, the number of the fifth slot insertion portion 1220 and the number of the sixth slot insertion portion 1222 are equal to 2N-1. As a result, as will be described later with reference to FIG. 7, the number of coil sides (the number of slot insertion portions) inserted into each slot 15 can be an odd number.

FIG. 6 is an explanatory diagram of a triple winding coil 121A according to another example, and is a schematic plan view seen in the radial direction.

A triple winding coil 121A according to another example mainly includes a second slot insertion portion 1212, a fourth slot insertion portion 1214, a switching connection portion 1217, and a switching are replaced with a second slot insertion portion 1212A, a fourth slot insertion portion 1214A, a switching connection portion 1217A, and a switching connection portion 1225A, respectively.

Essentially, the triple coil 121A according to another example differs from the triple coil 121 shown in FIG. The numbers of slot insertion portions 1211, second slot insertion portions 1212A, third slot insertion portions 1213, and fourth slot insertion portions 1214A are the same.

A switching connection 1217A forms a connection between the middle cassette coil portion CL3 and the inner cassette coil portion CL2. Specifically, the switching connection portion 1217A extends in the axial direction, and the axial inner end portion is connected to the lead-side end portion of the second slot insertion portion 1212A. The switching connection portion 1217A is connected at its axially outer end to the lead-side end of the sixth slot insertion portion 1222 via the fifth transition portion 1224A.

A switching connection 1225A forms a connection between the middle cassette coil portion CL3 and the outer cassette coil portion CL1. Specifically, the switching connection portion 1225A extends in the axial direction, and the axially inner end portion is connected to the lead-side end portion of the fifth slot insertion portion 1220 . The switching connection portion 1225A is connected at its axially outer end to the lead-side end of the fourth slot insertion portion 1214 via the first transition portion 1215A.

Also in the triple winding coil 121A according to another example, the number of the fifth slot insertion portions 1220 and the sixth slot insertion portions 1222 does not depend on the number of the first slot insertion portions 1211, but the number of the first slot insertion portions Assuming that the number of 1211 is N (≧2), the number can be 2N, for example, as in this embodiment.

According to such a triple winding coil 121A, similar to the triple winding coil 121 described above, the stator coil 12 described above can be configured by assembling a plurality of coils of the same type. That is, the above-described stator coil 12 can be configured using nine triple winding coils 121A shown in FIG.

In such a triple-wound coil 121A, the outer cassette coil portion CL1, the inner cassette coil portion CL2, and the middle cassette coil portion CL3 are each inserted into the corresponding slot 15, similar to the triple-wound coil 121 shown in FIG. are the same. That is, if the number of first slot insertion portions 1211 is N (≧2), the sum of the number of first slot insertion portions 1211 and fourth slot insertion portions 1214A is 2N, and the number of second slot insertion portions 1212A is 2N. , and the third slot insertion portion 1213 is 2N, and the total number of the fifth slot insertion portion 1220 and the sixth slot insertion portion 1222 is 2N, which are the same. As a result, the number of coil sides (the number of slot insertion portions) inserted into each slot 15 can be an even number.

FIG. 7 is an explanatory diagram of a configuration in which the number of slot insertion portions inserted into the slots 15 is an odd number. Here, a case will be described in which the stator coil 12 of FIG. 1 is realized using the triple winding coil 121 of FIG. 5 when N=5.

In FIG. 7, the number of each of the first slot insertion portion 1211 to the sixth slot insertion portion 1222 inserted into each slot is indicated by numerals "5", "4", or "9". Since N=5 in FIG. 7, a total of nine slot inserts are inserted into each slot 15 .

In this way, by using the triple winding coil 121 having the configuration shown in FIG. 5, the stator 10 in which an odd number of slot insertion portions are inserted can be formed.

By using the triple winding coil 121A having the configuration shown in FIG. 6, a stator (not shown) in which an even number of slot insertion portions are inserted can be formed.

By the way, the number of slot insertion portions inserted into each slot 15 of the stator 10 differs depending on the output characteristics and the like to be realized by the rotating electric machine provided with the stator 10 . In general, a relatively large number of slot insertion portions are inserted into each slot 15 in a rotating electrical machine with a relatively high output.

Therefore, when the triple winding coil 121 having the configuration shown in FIG. 5 is used, it is possible to optimize the configuration of the rotary electric machine for realizing specific output characteristics. For example, if a particular output characteristic is achieved when a total of nine slot inserts are inserted into each slot 15 as shown in FIG. If a configuration is realized in which a total of eight slot insertion portions are inserted into each slot 15, the output characteristics tend to be insufficient. On the other hand, if a configuration in which a total of 10 slot insertion portions are inserted into each slot 15 is realized using the triple winding coil 121A having the configuration shown in FIG. 6, the output characteristics become excessive. In such a case, using the triple winding coil 121 having the configuration shown in FIG. 5 can prevent such inconvenience. In other words, it is possible to increase the degree of freedom in the number of slot insertion portions that can be inserted into one slot 15 .

Further, when using the triple winding coil 121 having the configuration shown in FIG. The number of 6-crossover portions 1224B can be limited to N−1. As a result, the number of first and second transition portions 1215A and 1215B that form the coil ends can be efficiently reduced, and the size of the coil ends can be reduced.

Next, a method of assembling the triple winding coil 121 of the stator of this embodiment will be described with reference to FIGS. 8 to 10. FIG.

8 to 10 are explanatory diagrams of the method of assembling the triple winding coil 121 of the stator 10 of the present embodiment, and are plan views of the work in each stage of assembling.

The stator coil 12 comprising the triple-wound coil 121 according to this embodiment can be axially assembled to the stator core 11 from the outside in the axial direction by an inserter (not shown).

Specifically, in the method of assembling the stator coil 12 of the present embodiment, first, the three triple winding coils 121U related to the U phase are axially inserted into the stator core 11 from the outside in the axial direction by an inserter (not shown). Including assembling. FIG. 8 shows a state after the three U-phase triple winding coils 121U are assembled to the stator core 11. As shown in FIG.

For example, when using the triple winding coil 121 shown in FIG. passes through the space on the inner diameter side of the stator core 11 and extends from one axial side to the other side in the axial direction. In this case, the inserter axially inserts each of the first slot insertion portion 1211 to the sixth slot insertion portion 1222 of the triple winding coil 121 into the respective slots 15, while inserting the first transition portion 1215A, the third transition portion 1216A, and the third transition portion 1216A. After the fifth transition portion 1224A reaches the other side of the stator core 11, the first transition portion 1215A, the third transition portion 1216A, and the fifth transition portion 1224A are laid down radially outward, thereby assembling in the axial direction. can be completed. Alternatively, the inserter may be arranged such that the second transition portion 1215B, the fourth transition portion 1216B, and the sixth transition portion 1224B pass through the space on the inner diameter side of the stator core 11 from one side to the other side in the axial direction. Directional assembly may be implemented.

In this case, the three U-phase triple winding coils 121U may be set in the inserter by separate coil wires, or may be set in the inserter by one continuous coil wire.

Next, the method of assembling the stator coil 12 of the present embodiment includes axially assembling the three V-phase triple winding coils 121V to the stator core 11 from the outside in the axial direction using an inserter (not shown). The inserter may be a common inserter used when assembling the three U-phase triple winding coils 121U. Note that FIG. 9 shows a workpiece before assembly (a workpiece after the three triple winding coils 121U relating to the U phase are assembled to the stator core 11) together with the three triple winding coils 121V before assembly. FIG. 10 also shows a state after the three V-phase triple winding coils 121V are assembled to the stator core 11. As shown in FIG.

In this case, the three V-phase triple winding coils 121V may be set in the inserter by separate coil wires, or may be set in the inserter by one continuous coil wire.

The three V-phase triple coils 121V do not have a radially staggered relationship with the U-phase triple coils 121U that have already been assembled. Specifically, the first slot insertion portions 1211 of the three triple winding coils 121V related to the V phase are arranged radially inside the fourth slot insertion portions 1214 of the triple winding coil 121U related to the U phase, It can be inserted into the same slot 15 as the fourth slot insertion portion 1214 . Further, the third slot insertion portions 1213 of the three triple winding coils 121V related to the V phase are arranged radially inside the second slot insertion portions 1212 of the triple winding coil 121U related to the U phase. It can be inserted into the same slot 15 as the slot insertion portion 1212 . Therefore, after the three triple-wound coils 121U of the U-phase are assembled, the three triple-wound coils 121V of the V-phase are arranged from the radially inner side of them and from the axially-outer side of the stator core 11. can be assembled into

Therefore, the three triple coils 121V for the V-phase are also assembled at the same time (for example, in a state of being connected to each other as schematically shown in FIG. 9), similarly to the three triple coils 121U for the U-phase described above. be able to. As a result, more efficient assembly can be realized than when each of the three triple winding coils 121V relating to the V phase described above is separately assembled to the stator core 11 .

Next, the method of assembling the stator coil 12 of this embodiment includes axially assembling the three triple winding coils 121W associated with the W phase to the stator core 11 from the outside in the axial direction by an inserter (not shown). The three triple coils 121W for the W-phase are also arranged in a radially staggered manner in relation to the already assembled three triple-wound coils 121U for the U-phase and the three triple-wound coils 121V for the V-phase. not be related. Therefore, after the three triple coils 121U of the U phase and the three triple coils 121V of the V phase are assembled, the three triple coils 121W of the W phase are arranged from the inside in the radial direction and It can be axially assembled to the stator core 11 from the outside in the axial direction.

Therefore, the three triple coils 121W for the W phase can be assembled at the same time as the three triple coils 121U for the U phase and the three triple coils 121V for the V phase. As a result, more efficient assembly can be achieved than when each of the three triple winding coils 121W relating to the W phase is separately assembled to the stator core 11 described above.

Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes are possible within the scope described in the claims. It is also possible to combine all or more of the constituent elements of the above-described embodiments. Further, among the effects of each embodiment, the effects related to dependent claims are additional effects distinguished from generic concepts (independent claims).

10... Stator (stator for rotary electric machine), 11... Stator core, 15... Slot, 12... Stator coil, 121... Triple winding coil, CL1... Outer cassette coil portion (first coil portion), CL2: inner cassette coil portion (second coil portion), CL3: intermediate cassette coil portion (third coil portion)

Claims (5)

a stator core having a plurality of slots;
a stator coil formed by winding a plurality of triple-wound coils concentrically including three coil portions having a coil shape closed in the radial direction around the entire circumference of the stator core for each phase. ,
The three coil portions in one triple-wound coil include slot insertion portions on both sides in the circumferential direction that are inserted into different slots, and axially opposite sides extending in the circumferential direction between the slot insertion portions on both sides in the circumferential direction. The transition portion forms the closed coil shape,
The three coil portions are: a first coil portion having the longest circumference; a second coil portion having a circumference shorter than the first coil portion by a pitch of four slots; consists of a third coil portion that is shorter by a pitch of two slots,
In the plurality of triple wound coils, the slot insertion portion of the first coil portion and the slot insertion portion of the second coil portion of one of the triple wound coils are the slots of the first coil portion of the other triple wound coil. A stator for a rotary electric machine, which is inserted into each corresponding slot in a manner radially adjacent to the insertion portion and the slot insertion portion of the second coil portion. In one of the triple winding coils, the sum of the total number of slot insertion portions on both sides in the circumferential direction in the first coil portion and the total number of slot insertion portions on both sides in the circumferential direction in the second coil portion is , equal to the total number of slot inserting portions on both sides in the circumferential direction of the third coil portion. the first coil portions of the triple-wound coils for each phase are inserted into the same slots as the first coil portions of the triple-wound coils for other phases;
the second coil portions of the triple-wound coils for each phase are inserted into the same slots as the second coil portions of the triple-wound coils for other phases;
3. The stator for a rotating electric machine according to claim 2, wherein said third coil portion of said triple winding coil associated with each phase is inserted into a slot into which other said triple winding coils are not inserted. In the first coil portion of one of the triple winding coils, the number of slot insertion portions inserted into slots on one side in the circumferential direction is greater than the number of slot insertion portions inserted into slots on the other side in the circumferential direction. one more,
In the second coil portion of the one triple winding coil, the number of slot insertion portions inserted into the slots on the one side in the circumferential direction is equal to the number of slot insertion portions inserted in the slots on the other side in the circumferential direction. One less than the number,
In the third coil portion of the one triple winding coil, the number of slot insertion portions inserted into the slots on the one side in the circumferential direction is equal to the number of slot insertion portions inserted in the slots on the other side in the circumferential direction. 4. The stator for a rotary electric machine according to claim 3, equal to the number. each of the triple-wound coils relating to the first phase is arranged radially outside of each of the triple-wound coils relating to the second phase,
5. The triple-wound coil according to any one of claims 1 to 4, wherein each of said triple-wound coils relating to a third phase is arranged radially inward of each of said triple-wound coils relating to said second phase. Stator for rotating electric machine.

Images