Stator for rotary electric machine and method for manufacturing stator for rotary electric machine

Abstract

The present application relates to a stator for a rotating electric machine and a manufacturing method of a stator for a rotating electric machine. A stator for a rotating electric machine includes a stator core, and a multiphase stator coil wound in a double-layer winding on the stator core, the multiphase stator coil being formed by winding a plurality of double-winding coils of each phase around the stator core, each of the plurality of double-winding coils having a coil portion with a long circumference and a coil portion with a short circumference concentrically, the double-winding coils of each phase include a first double-winding coil on a side farthest from a neutral point and a second double-winding coil other than the first double-winding coil, a combination of the first double-winding coils of only the first phase and the second phase among the first double-winding coils of the first to third phases overlap in a specific circumferential interval corresponding to at least one slot, and the first double-winding coils of different phases are inserted into different slots.

Description

Technical Field

[0001] This invention relates to a stator for a rotating electric machine and a method for manufacturing a stator for a rotating electric machine. Background Technology

[0002] It is known that there is a stator of a rotating electric motor in which multiple coils of different phases are arranged circumferentially overlapping in a portion of multiple slots.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-182963

[0004] However, in the prior art described above, since the structure is based on phases and alternates between double-winding coil sections and single-winding coil sections in the circumferential direction, there is a problem that the types of coils forming the stator coils increase and the winding method becomes more complex.

[0005] On the other hand, using a single double-winding coil can solve the above problems, but conversely, depending on the configuration of the double-winding coils for each phase, the double-winding coils of different phases may be close to each other at the coil ends or in the slots. If the double-winding coils of different phases are close to each other radially, then measures for interphase insulation, such as interphase insulating paper, are required, which may lead to increased costs. In particular, the potential difference of the double-winding coil of different phases on the side furthest from the neutral point is higher than the potential difference between other double-winding coils of different phases, so if they are close to each other radially, the necessity for interphase insulation increases. Summary of the Invention

[0006] Therefore, the object of the present invention is to utilize a double-winding coil and reduce or eliminate the need for phase-to-phase insulation measures.

[0007] According to one aspect of the present invention, a stator for a rotary electric motor is provided, comprising:

[0008] Stator core, which has multiple slots; and

[0009] The stator coil is formed by winding multiple double-winding coils, each comprising two coil portions that are closed when viewed radially, in a phase-by-phase manner, around the aforementioned stator core.

[0010] The two coil portions of a dual-winding coil are respectively connected by slot insertion portions on both circumferential sides of different slots, and axial transition portions extending circumferentially between the ends of the slot insertion portions on both circumferential sides, to form the closed coil shape.

[0011] Multiple dual-winding coils are inserted into slots such that the slot insertion portion of one dual-winding coil is radially adjacent to the slot insertion portions of other dual-winding coils.

[0012] Each phase's double-winding coil includes a first double-winding coil on the side furthest from the neutral point, and a second double-winding coil elsewhere.

[0013] The combination of only the first double-winding coil of the first phase, the first double-winding coil of the second phase, and the first double-winding coil of the third phase overlaps in a specific circumferential interval corresponding to at least one slot, and the slot insertion portions of the first double-winding coils of different phases are inserted into different slots.

[0014] According to the present invention, a double-winding coil can be used and measures for phase-to-phase insulation can be reduced or eliminated. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the stator of the rotary electric motor in Embodiment 1.

[0016] Figure 2 This is a simplified top view of a preferred example of a two-winding coil viewed radially.

[0017] Figure 3 This is a simplified top view of another example of a two-winding coil viewed radially.

[0018] Figure 4 It is a diagram showing the overall structure of the stator coil.

[0019] Figure 5 This is a cross-sectional view illustrating the configuration of the first double-winding coil.

[0020] Figure 6 yes Figure 5 Enlarged view of the area near Q6.

[0021] Figure 7 It is a diagram showing the structure inside the slot.

[0022] Figure 8 This is a cross-sectional view of the stator of the rotary motor in Embodiment 2.

[0023] Figure 8A yes Figure 8 A magnified view of the area near Q8.

[0024] Figure 9 This is a cross-sectional view showing the configuration of the transition section (structure of this embodiment) starting from the end slot in a specific circumferential section.

[0025] Figure 10 This is a cross-sectional view showing the configuration of the transition section starting from the end slot in a specific circumferential section (the structure of Embodiment 2).

[0026] Figure 11 This is an explanatory diagram (1) of the manufacturing method of the stator of the rotary electric machine in this embodiment.

[0027] Figure 12 This is an explanatory diagram (Figure 2) illustrating the manufacturing method of the stator of the rotary electric machine in this embodiment.

[0028] Figure 13 This is a cross-sectional view of the stator of the rotary motor in Embodiment 3. Detailed Implementation

[0029] Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings. Furthermore, the dimensions in the drawings are merely examples and are not limiting; also, for ease of explanation, shapes and other details in the drawings may be exaggerated.

[0030] Figure 1 This is a cross-sectional view of the stator 10 of the rotary electric machine according to this embodiment. In the following description, axial direction refers to the direction in which the rotation axis (rotation center) I of the rotary electric machine extends, and radial direction refers to the radial direction centered on the rotation axis I. Therefore, radial outer side refers to the side away from the rotation axis I, and radial inner side refers to the side facing the rotation axis I. Furthermore, circumferential direction corresponds to the rotation direction about the rotation axis I. Additionally, in... Figure 1 In order to facilitate observation, sometimes only a portion of the parts with the same attribute that exist in multiple locations are labeled with reference to the attached diagram.

[0031] exist Figure 1 The image shows a cross-section of the stator 10 when cut with a section perpendicular to the axial direction. Furthermore, in... Figure 1 (The following) Figure 5 Similarly, in the example (and so on), the coil portion (slot insertion portion) inserted into the slot 15 is indicated by a symbol marked with an "×" inside a circle or a small "●" inside a circle. The difference in this symbol corresponds to the different directions of current flow when energized (i.e., axially through the paper or away from the paper). Furthermore, in Figure 1 (The following) Figure 5 In the same manner, the stator coil 12 and the portion other than the slot insertion part are schematically shown together to understand the circumferential configuration.

[0032] The rotating electric motor is of the internal rotor type, with the stator 10 positioned radially outward around the rotor (not shown). The rotating electric motor can be, for example, a vehicle drive motor used in hybrid vehicles or electric vehicles. However, it can also be a motor used for any other purpose.

[0033] The stator 10 has a stator core 11 and a stator coil 12.

[0034] The stator core 11 can be formed, for example, from a stack of steel plates containing annular magnetic materials. Radial teeth 14 protruding inwards are formed on the inner circumference of the stator core 11. Multiple teeth 14 divide adjacent teeth 14 in a circumferentially oriented manner into multiple slots 15. The number of teeth 14 and their associated slots 15 is arbitrary, but in this embodiment, as an example, 36 are provided. Figure 1 In the diagram, the numbers 1 to 36 are shown within circles corresponding to the 36 slots 15. Hereinafter, when each slot 15 is represented individually, it will be marked with slot 15-k (k = 1 to 36). For example, slot 15-1 represents the slot 15 corresponding to writing the number "1" into the circle. Furthermore, although this embodiment is an example of a three-phase six-pole 36-slot rotary motor, the aforementioned quantities can be appropriately changed. In the case of a three-phase six-pole 36-slot motor, six slots represent the coil spacing of a full-pitch winding; therefore, five slots or less represent the coil spacing of a short-pitch winding, and seven slots or more represent the coil spacing of a long-pitch winding.

[0035] The stator coil 12 is wound around the teeth 14 (i.e., slots 15) of the stator core 11. The stator coil 12 is wound in a double-layer winding on the stator core 11. Furthermore, the stator coil 12 can, for example, be electrically connected at the neutral point of the Y-junction in a parallel relationship (see reference). Figure 4 ).

[0036] Furthermore, in double-layer windings, the change (distribution) of magnetomotive force corresponding to changes in angle can be made relatively smooth (because the waveform of the magnetomotive force can be made closer to a sine wave), thus reducing spatial harmonics. In other words, NV (Noise Vibration) performance becomes better.

[0037] In this embodiment, the stator coil 12 is formed by double-winding coils 121U, 121V, and 121W, each wound concentrically with different circumferences, representing phases U (an example of the first phase), V (an example of the third phase), and W (an example of the second phase). Double-winding coil 121U is used for the U phase, and in this embodiment, six coils are provided. Similarly, double-winding coil 121V is used for the V phase, and six double-winding coils 121W are used for the W phase, and six double-winding coils are provided. Furthermore, the double-winding coils 121U, 121V, and 121W will be referred to simply as "double-winding coil 121" without distinguishing between the phases.

[0038] A double-winding coil 121, viewed radially, has two concentric, approximately hexagonal coil portions (see reference). Figure 2The coil portion with the longer circumference (circumferential length) of the two coil portions is hereinafter referred to as the "outer coil portion," and the coil portion with the shorter circumference is hereinafter referred to as the "inner coil portion." Furthermore, a preferred example of the dual-winding coil 121 is described below. Figure 2 as well as Figure 3 This will be discussed later.

[0039] A dual-winding coil 121 is inserted into four slots 15. That is, the outer coil portion is inserted into two slots 15, and the inner coil portion is inserted into the other two slots 15.

[0040] Specifically, the outer coil portion of a dual-winding coil 121 is inserted into a pair of circumferentially outer slots 15, and the inner coil portion of the dual-winding coil 121 is inserted into a pair of circumferentially inner slots 15. In this case, the pair of circumferentially outer slots 15 sandwich five slots 15 in the circumferential direction (i.e., the outer coil portion is a long-pitch winding). That is, the outer coil portion of the dual-winding coil 121 is arranged with seven slots 15 circumferentially. Conversely, the pair of circumferentially inner slots 15 sandwich three slots 15 in the circumferential direction (i.e., the inner coil portion is a short-pitch winding). That is, the inner coil portion of the dual-winding coil 121 is arranged with five slots 15 circumferentially. Furthermore, in this case, the circumference of the outer coil portion corresponds to the circumference of the seven slots, and the circumference of the inner coil portion corresponds to the circumference of the five slots, corresponding to their respective coil spacing.

[0041] For example, in one of the six dual-winding coils 121U, Figure 1 The outer coil portion of a dual-winding coil 121U corresponding to the star mark is inserted into a pair of circumferentially outer slots 15-2 and 15-8, while the inner coil portion is inserted into a pair of circumferentially inner slots 15-3 and 15-7. In this case, the circumferential center of the pair of circumferentially outer slots 15-2 and 15-8 coincides with the circumferential center of the pair of circumferentially inner slots 15-3 and 15-7, which is the position of slot 15-5. The above applies to the other dual-winding coils 121U and the various dual-winding coils 121V and 121W.

[0042] In particular, in this embodiment, the outer casing coil portions of each of the dual-winding coils 121U, 121V, and 121W are inserted into specific slots (hereinafter also referred to as "long-pitch winding slots") in a plurality of slots 15 via long-pitch windings, with the same phase pairs inserted into each other. For example, the long-pitch winding slots for the dual-winding coil 121U are slots 15-2, 15-8, 15-14, 15-20, 15-26, and 15-32.

[0043] On the other hand, the inner coil portions of each of the dual-winding coils 121U, 121V, and 121W are inserted into other specific slots (hereinafter also referred to as "short-pitch winding slots") in multiple slots through short-pitch windings for different phase pairs. For example, the short-pitch winding slots for the dual-winding coil 121U are slots 15-1, 15-3, 15-7, 15-9, 15-13, 15-15, 15-19, 15-21, 15-25, 15-27, 15-31, and 15-33. Furthermore, in the aforementioned short-pitch winding slots, slot 15-1 inserts the inner coil portion of the dual-winding coil 121V, slot 15-3 inserts the inner coil portion of the dual-winding coil 121W, slot 15-7 inserts the inner coil portion of the dual-winding coil 121V, and slot 15-9 inserts the inner coil portion of the dual-winding coil 121W, and so on.

[0044] Furthermore, in this embodiment, the inner coil portion of one phase of the inner coil portion of different phases is radially inward, while the inner coil portion of the other phase is radially outward, and is inserted into the slot 15. In this embodiment, even in any short-pitch winding slot, the inner coil portion of the U-phase double-winding coil 121U is radially outward, and the inner coil portion of the W-phase double-winding coil 121W is radially inward. As a result, even in any short-pitch winding slot, the inner coil portion of the V-phase double-winding coil 121V is radially inward of the inner coil portion of the double-winding coil 121U, or radially outward of the inner coil portion of the double-winding coil 121W.

[0045] Specifically, the inner coil portion of the dual-winding coil 121U, even in any short-pitch winding slot, is located radially outward compared to the inner coil portions of the other phases of the dual-winding coil 121, namely the inner coil portions of the dual-winding coil 121V and the inner coil portions of the dual-winding coil 121W.

[0046] Furthermore, even in any short-pitch winding slot, the inner coil portion of the dual-winding coil 121W is located radially inward than the inner coil portions of the dual-winding coils 121 of other phases, namely the inner coil portions of the dual-winding coil 121U and the inner coil portions of the dual-winding coil 121V.

[0047] Furthermore, in any short-pitch winding slot, the inner coil portion of the dual-winding coil 121V is located radially inward compared to the inner coil portion of the dual-winding coil 121U when paired with the inner coil portion of the dual-winding coil 121U, and radially outward compared to the inner coil portion of the dual-winding coil 121W when paired with the inner coil portion of the dual-winding coil 121W.

[0048] According to this embodiment, the stator coil 12 can be easily assembled from the radially outer side in the order of U phase, V phase, and W phase using inserts or the like, resulting in excellent assemblability (see reference). Figure 11 as well as Figure 12 (To be discussed later).

[0049] Figure 2 This is an explanatory diagram of a preferred example of a two-winding coil 121, and is a simplified top view viewed from the radial direction. Hereinafter, one two-winding coil 121 will be described, but as mentioned above, other two-winding coils 121 are actually the same (only the transition lines and other parts are different).

[0050] exist Figure 2 In the example shown, the dual-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 transition portions 1215A and 1215B, third and fourth transition portions 1216A and 1216B, a switching connection portion 1217, and ends 1210 and 1218.

[0051] The dual-winding coil 121 is a single component from end 1210 to end 1218, and can be formed by winding one or more coil wires (with circular or rectangular cross-sectional shapes) around a coil frame more than once. Furthermore, the number of slot insertion portions (N, N-1) described below corresponds to the number of coil wires. Figure 2 In the diagram, thick lines indicate a state where there are two or more strands. Additionally, the ends 1210 and 1218 are bent into shape from the straight lines shown in the illustration.

[0052] The first slot insertion portion 1211, the second slot insertion portion 1212, the third slot insertion portion 1213, and the fourth slot insertion portion 1214 are respectively the portions of the coil pieces inserted into the slots 15. Furthermore, the slots 15 into which the first slot insertion portion 1211, the second slot insertion portion 1212, the third slot insertion portion 1213, and the fourth slot insertion portion 1214 are inserted are different from each other. In this embodiment, as described above, with respect to a dual-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 coincides with 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. Furthermore, regarding a dual-winding coil 121, the slot 15 (for long-pitch winding) into which the first slot insertion portion 1211 is inserted and the slot 15 (for short-pitch winding) into which the second slot insertion portion 1212 is inserted are adjacent in the circumferential direction. Additionally, the slot 15 (for long-pitch winding) into which the fourth slot insertion portion 1214 is inserted and the slot 15 (for short-pitch winding) into which the third slot insertion portion 1213 is inserted are adjacent in the circumferential direction. Moreover, 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 aforementioned outer coil portion, and the second slot insertion portion 1212 and the third slot insertion portion 1213, together with the third and fourth transition portions 1216A and 1216B, form the aforementioned inner coil portion.

[0053] For example, when in Figure 1 China passed Figure 2 When the dual-winding coil 121 shown forms a dual-winding coil 121U corresponding to the star mark, slot 15-8 is a slot for long-pitch winding, slot 15-7 is a slot for short-pitch winding, slot 15-3 is a slot for short-pitch winding, and slot 15-2 is a slot for long-pitch winding.

[0054] The first transition portion 1215A forms a coil end on the wire side. One circumferential side of the first transition portion 1215A is connected to the wire side end of the first slot insertion portion 1211, and the other circumferential side is connected to the wire side end of the fourth slot insertion portion 1214.

[0055] The second transition portion 1215B forms the coil end on the reverse lead side. One circumferential side of the second transition portion 1215B is connected to the reverse lead side end of the first slot insertion portion 1211, and the other circumferential side is connected to the reverse lead side end of the fourth slot insertion portion 1214.

[0056] The third transition portion 1216A forms the coil end on the wire side. One circumferential side of the third transition portion 1216A is connected to the wire side end of the second slot insertion portion 1212, and the other circumferential side is connected to the wire side end of the third slot insertion portion 1213.

[0057] The fourth transition portion 1216B forms the coil end on the reverse lead side. One circumferential side of the fourth transition portion 1216B is connected to the reverse lead side end of the second slot insertion portion 1212, and the other circumferential side is connected to the reverse lead side end of the third slot insertion portion 1213.

[0058] The switching connection 1217 forms a connection between the inner coil portion and the outer coil portion. Specifically, the switching connection 1217 is connected to the end of the second slot insertion portion 1212 of the fourth transition portion 1216B. One circumferential side of the switching connection 1217 is connected to the reverse lead side end of a third slot insertion portion 1213 via the fourth transition portion 1216B, and the other circumferential side is connected to the reverse lead side end of a first slot insertion portion 1211.

[0059] Here, as described above, when forming a double-winding coil 121 with N first slot insertion portions 1211, the process is repeated in the following order: from end 1210 to third slot insertion portion 1213, fourth transition portion 1216B, second slot insertion portion 1212, third transition portion 1216A, third slot insertion portion 1213, and fourth transition portion 1216B, until N third slot insertion portions 1213 and fourth transition portions 1216B are formed. Furthermore, if the Nth fourth transition section 1216B is formed, a switching connection section 1217 is formed from the Nth fourth transition section 1216B. Then, the process is repeated in the same order: first slot insertion section 1211, first transition section 1215A, fourth slot insertion section 1214, second transition section 1215B, first slot insertion section 1211, first transition section 1215A, fourth slot insertion section 1214, second transition section 1215B, until N-1 second transition sections 1215B are formed. Moreover, if the N-1 second transition section 1215B is formed, an end portion 1218 is formed after the Nth first slot insertion section 1211 is formed.

[0060] With this dual-winding coil 121, the number of first slot insertion parts 1211 and fourth slot insertion parts 1214 can differ by only one, and the number of second slot insertion parts 1212 and third slot insertion parts 1213 can differ by only one. That is, if the number of first slot insertion parts 1211 is set to N (≥2), then the number of fourth slot insertion parts 1214 can be set to N-1, and if the number of second slot insertion parts 1212 is set to N-1, then the number of third slot insertion parts 1213 can be set to N. Furthermore, the switching connection part 1217 is connected to one of the N first slot insertion parts 1211, and is connected to one of the N third slot insertion parts 1213 via the fourth transition part 1216B. Similarly, the ends 1210 and 1218 are connected to one of the N third slot insertion parts 1213 and one of the N first slot insertion parts 1211, respectively. Furthermore, in a modified example, the switching connection 1217 can be connected to the reverse wire side end of a first slot insertion part 1211 via a portion of the second transition part 1215B.

[0061] In this dual-winding coil 121, the total number of coil pieces (coil count) inserted into the corresponding slots 15 in the outer coil portion is the same as the total number of coil pieces (coil count) inserted into the corresponding slots 15 in the inner coil portion. That is, if the number of first slot insertion parts 1211 is set to N (≥2), then the total number of each of the first slot insertion parts 1211 and the fourth slot insertion parts 1214 is 2N-1, and the total number of each of the second slot insertion parts 1212 and the third slot insertion parts 1213 is 2N-1, which is the same.

[0062] Furthermore, such a dual-winding coil 121 can be easily assembled into the corresponding slot 15 using a clamp (insulator), thereby achieving efficient assembly.

[0063] Figure 3 This is an explanatory diagram of another example of a double-winding coil 121A, which is a simplified top view viewed radially.

[0064] Other examples of dual-winding coil 121A and Figure 2 The difference in the dual-winding coil 121 shown is that the second slot insertion part 1212, the fourth slot insertion part 1214, and the switching connection part 1217 are replaced by the second slot insertion part 1212A, the fourth slot insertion part 1214A, and the switching connection part 1217A, respectively.

[0065] Essentially, the dual-winding coil 121A in other examples is similar to... Figure 2The difference between the dual-winding coil 121 shown is the position of the switching connection 1217A. The number of the first slot insertion part 1211, the second slot insertion part 1212A, the third slot insertion part 1213, and the fourth slot insertion part 1214A are all the same. That is, if the number of first slot insertion parts 1211 is set to N, then the number of fourth slot insertion parts 1214A, the number of second slot insertion parts 1212A, and the number of third slot insertion parts 1213 can all be set to N.

[0066] In such a double-winding coil 121A, with Figure 2 The dual-winding coil 121 shown is identical in that the total number of coil pieces (coil count) inserted into the corresponding slots 15 in the outer coil portion is the same as the total number of coil pieces (coil count) inserted into the corresponding slots 15 in the inner coil portion. That is, if the number of first slot insertion parts 1211 is set to N (≥2), then the total number of each of the first slot insertion parts 1211 and the fourth slot insertion part 1214A is 2N, and the total number of each of the second slot insertion parts 1212A and the third slot insertion parts 1213 is also 2N, which is the same.

[0067] Thus, by using Figure 2 The dual-winding coil 121 shown can form a stator 10 into which an odd number of slot insertion parts can be inserted.

[0068] In addition, if using Figure 3 The dual-winding coil 121A shown can form a stator (not shown) for insertion into an even number of slot insertion parts.

[0069] However, the number of slot insertion portions in each slot 15 of the stator 10 varies depending on the output characteristics to be achieved by the rotary motor equipped with the stator 10. Generally, in rotary motors with higher output, a larger number of slot insertion portions are inserted into each slot 15.

[0070] Regarding this point, selective use Figure 2 The structure shown is a double-winding coil 121 or Figure 3 With the dual-winding coil 121A shown, the structure of the rotary electric machine for achieving specific output characteristics can be optimized. For example, when a specific output characteristic is achieved by inserting a total of seven slot insertion parts into each slot 15, the structure of the rotary electric machine for achieving specific output characteristics can be optimized. Figure 3 When the structure shown has a dual-winding coil 121A and a total of six slot insertion parts are inserted into each slot 15, there is a tendency for insufficient output characteristics. In contrast, when implementing the structure using... Figure 3When the dual-winding coil 121A shown is inserted into each of the eight slot insertion parts 15, the output characteristics become too large. In such a case, by using... Figure 2 The dual-winding coil 121 shown in the diagram can prevent the aforementioned problems. In other words, it can increase the freedom to determine the number of slot insertion portions that can be inserted into a slot 15.

[0071] In addition, in use Figure 2 In the case of the dual-winding coil 121 with the structure shown, N first slot insertion portions 1211 and third slot insertion portions 1213 can be formed, and the number of first and second transition portions 1215A, 1215B and third transition portions 1216A is limited to N-1. Therefore, the number of first and second transition portions 1215A and 1215B at the coil end can be efficiently reduced, and the coil end volume can be reduced.

[0072] Figure 4 This is a diagram schematically illustrating an example of the connection method of the stator coil 12. In this embodiment, as an example, such as... Figure 4 As schematically shown, the stator coils 12 are electrically connected at the neutral point of the Y-junction in two parallel sets, one for each phase. Specifically, the two sets of double-winding coils 121U-1 and 121U-2 of the U phase of the stator coil 12 are electrically connected in parallel between the neutral point and the U-phase terminal 90U on the power line side. Similarly, the two sets of double-winding coils 121V-1 and 121V-2 of the V phase of the stator coil 12 are electrically connected in parallel between the neutral point and the V-phase terminal 90V on the power line side. Furthermore, the two sets of double-winding coils 121W-1 and 121W-2 of the W phase of the stator coil 12 are electrically connected in parallel between the neutral point and the W-phase terminal 90W on the power line side.

[0073] In addition, Figure 4 In this design, each group of double-winding coils, such as double-winding coil 121U-1, includes the three double-winding coils 121 mentioned above, forming a total of six coil sections. Hereinafter, the double-winding coil 121 on the side furthest from the neutral point among the three double-winding coils 121 in each group of each phase will be referred to as the "first double-winding coil 121," and the other two double-winding coils 121 will be referred to as the "second double-winding coil 121." Furthermore, when distinguishing between phases, the first double-winding coil 121 is sometimes designated using symbols such as 121U, 121V, and 121W.

[0074] In each of the two sets of phase U, one end of the first double-winding coil 121U is electrically connected without passing through other double-winding coils 121, and the other end is electrically connected to the power line side end of the second double-winding coil 121U. Similarly, in each of the two sets of phase V, one end of the first double-winding coil 121V is electrically connected without passing through other double-winding coils 121 to the V-phase terminal 90V on the power line side, and the other end is electrically connected to the power line side end of the second double-winding coil 121V. Similarly, in each of the two sets of phase W, one end of the first double-winding coil 121W is electrically connected without passing through other double-winding coils 121 to the W-phase terminal 90W on the power line side, and the other end is electrically connected to the power line side end of the second double-winding coil 121W.

[0075] Next, refer to Figure 5 The structure of stator coil 12 will be explained in more detail in the following diagrams. Furthermore, the following is provided as an example, although it is not applicable to the use of… Figure 2 The example of the dual-winding coil 121 shown is used for illustration, but using Figure 3 The same applies to the double-winding coil 121A shown, and other double-winding coils (not shown). Furthermore, unless otherwise specified, while the coil ends on the conductor side will be described below, the same applies to the coil ends on the reverse conductor side. Also, unless otherwise specified, the transition portion of the double-winding coil 121 refers to... Figure 2 The first transition portion 1215A and the third transition portion 1216A of the dual-winding coil 121 are shown. Furthermore, unless otherwise specified below, the slot insertion portion of the outer coil portion of the dual-winding coil 121 refers to... Figure 2 The first slot insertion portion 1211 and the fourth slot insertion portion 1214 of the dual-winding coil 121 are shown. In addition, the transition portion is the portion that starts from the axial end of the slot insertion portion (the axial end of the portion housed in the slot 15).

[0076] Figure 5 This is an explanatory diagram of the configuration of the first double-winding coil 121. Figure 1 In the diagram shown, only the first double-winding coil 121 is shown in shaded area. Furthermore, in Figure 5 (The following) Figure 8 In order to distinguish the first double-winding coil 121 and the second double-winding coil 121, the first double-winding coil 121 is marked with a "square (diamond)" mark in parentheses after the reference numeral 121U. Figure 6 yes Figure 5 The enlarged view near part Q6 is an illustration of the structure of a specific circumferential section. Figure 7 This diagram illustrates the configuration of the dual-winding coils 121 in each slot 15, and is a simplified representation of the configuration of a portion of the slots 15-8 to 15-11.

[0077] In this embodiment, as Figure 5 as well as Figure 6 As shown, the first double-winding coil 121U of phase U and the first double-winding coil 121W of phase W are in a specific circumferential range (refer to...). Figure 5 as well as Figure 6 The Q6 part overlaps, and as Figure 5 as well as Figure 7 As shown, the first double-winding coils 121 of different phases are inserted into different slots 15.

[0078] Specifically, the two first double-winding coils 121U of phase U extend circumferentially from slot 15-2 to slot 15-14, the two first double-winding coils 121V of phase V extend circumferentially from slot 15-24 to slot 15-36, and the two first double-winding coils 121W of phase W extend circumferentially from slot 15-10 to slot 15-22. Therefore, in this case, the circumferential intervals from slot 15-10 to slot 15-14 corresponding to the five slots become specific circumferential intervals, in which the first double-winding coils 121U of phase U and the first double-winding coils 121W of phase W overlap. Furthermore, overlap refers to the manner in which they extend along the same circumferential interval.

[0079] In addition, the two first double-winding coils 121U of phase U are inserted into slots 15-2, 15-3, 15-7, 15-8, 15-9, 15-13, and 15-14; the two first double-winding coils 121V of phase V are inserted into slots 15-24, 15-25, 15-29, 15-30, 15-31, 15-35, and 15-36; and the two first double-winding coils 121W of phase W are inserted into slots 15-10, 15-11, 15-15, 15-16, 15-17, 15-21, and 15-22. In this way, the two first double-winding coils 121U of phase U are inserted into slots 15 that are different from the two first double-winding coils 121V of phase V and the two first double-winding coils 121W of phase W.

[0080] However, the U-phase terminal 90U, V-phase terminal 90V, and W-phase terminal 90W are electrically connected to the high-potential side and the low-potential side according to the on / off state of each switching element of the inverter (not shown). Therefore, when driving the rotating motor, a relatively large potential difference is generated corresponding to the rated voltage of the high-voltage battery (not shown) (or the boosted voltage if boosted by a DC / DC converter, etc.). Consequently, the largest potential difference is generated between the non-phase dual-winding coils 121, specifically between the first dual-winding coil 121 closest to the U-phase terminal 90U, V-phase terminal 90V, and W-phase terminal 90W. That is, a larger potential difference is generated between the first dual-winding coils 121 than between the second dual-winding coils 121 or between the first and second dual-winding coils 121.

[0081] Therefore, when the stator coil 12 is formed by such multiple double-winding coils 121, the required insulation can be easily ensured as the stator coil 12, as long as the required electrical insulation distance can be ensured between the first double-winding coils 121 of different phases.

[0082] Regarding this point, in this embodiment, as described above, in the circumferential direction, only the first double-winding coil 121U of phase U and the first double-winding coil 121W of phase W overlap within a specific circumferential interval, so ensuring the insulation of the coil ends in other circumferential intervals is easy. Therefore, in circumferential intervals outside the specific circumferential interval, the necessity for phase-to-phase insulation measures can be reduced or eliminated. Thus, for example, it is possible to achieve a structure in which phase-to-phase insulation paper is not provided in circumferential intervals outside the specific circumferential intervals throughout the entire circumference of the stator coil 12. This prevents adverse conditions caused by phase-to-phase insulation paper (increased costs, complicated assembly processes, etc.).

[0083] Furthermore, in this embodiment, within a specific circumferential interval, such as Figure 5 as well as Figure 6 As shown, in the radial direction, the transition portion of the second double-winding coil 121V is arranged between the transition portion of the first double-winding coil 121U of phase U and the transition portion of the first double-winding coil 121W of phase W. Thus, in the radial direction, the first double-winding coil 121U of phase U and the first double-winding coil 121W of phase W overlap in a specific circumferential interval, but are not directly adjacent in the radial direction. Therefore, even in the specific circumferential interval, the necessity for phase-to-phase insulation measures can be reduced or eliminated. Thus, for example, even in a specific circumferential interval throughout the entire circumference of the stator coil 12, a structure without phase-to-phase insulating paper can be achieved.

[0084] Furthermore, according to this embodiment, since the first dual-winding coils 121 of different phases are not inserted into the same slot 15, the necessity for phase-to-phase insulation measures can be reduced or eliminated in all slots 15. Thus, for example, it is possible to achieve insertion into all slots of the stator coil 12 (e.g., in...). Figure 2 In the example shown, the first slot insertion part 1211, etc., does not have a structure with interphase insulation paper. Furthermore, by implementing a structure that does not include interphase insulation paper in the slot 15, the coil duty cycle within the slot 15 can be increased. In other words, compared to the case where interphase insulation paper is provided in the slot 15, the volume of the stator core 11 can be reduced without changing the coil duty cycle within the slot 15.

[0085] Next, refer to Figure 5 , Figure 6 as well as Figures 8-10 The structure of this embodiment is further described together with other embodiments (hereinafter also referred to as "Embodiment 2").

[0086] Figure 8 This is a cross-sectional view showing the configuration of the stator coils 12A of the stator 10A in Embodiment 2. Figure 8 In, with Figure 5 Similarly, only the first dual-winding coil 121 of the dual-winding coils 121 is marked with a shaded line. Figure 8A yes Figure 8 A magnified view of the area near Q8. Figure 9 This is an explanatory diagram of the configuration of the transition portion starting from the end slot in a specific circumferential section of this embodiment, and a cross-sectional view of a portion of the stator 10 when cut with a plane including the rotation axis I. Figure 10 This is an explanatory diagram of the configuration of the transition portion starting from the end slot in a specific circumferential section of Embodiment 2, and is a cross-sectional view of a portion of the stator 10A when cut with a plane including the rotation axis I. Figure 9 as well as Figure 10 In the middle, with the preceding Figure 5 To distinguish the first double-winding coil 121 from the second double-winding coil 121, a "square" mark is placed in parentheses in the first double-winding coil 121.

[0087] The stator coil 12A of stator 10A in Embodiment 2 differs from the stator coil 12 of this embodiment mainly in the configuration of the slot insertion portion of the slots (slots 15-10 and 15-14 in this embodiment) at both ends of the specific circumferential interval.

[0088] Specifically, in the stator coil 12 of this embodiment, in the slots (hereinafter also referred to as "end slots of the specific circumferential section (an example of a specific slot)") forming the two ends of a specific circumferential section (in this embodiment, slots 15-10 and 15-14), as follows: Figure 5 as well as Figure 6 As shown, the slot insertion portion of the first double-winding coil 121 of one phase is radially positioned away from the slot insertion portion of the second double-winding coil 121 of the same phase. More specifically, in slots 15-10, the slot insertion portion of the first double-winding coil 121W of phase W is inserted radially inward than the slot insertion portion of the second double-winding coil 121W of phase W (i.e., radially away from the transition portion of the first double-winding coil 121U of phase U that circumferentially crosses slots 15-10). Furthermore, in slots 15-14, the slot insertion portion of the first double-winding coil 121U of phase U is inserted radially outward than the slot insertion portion of the second double-winding coil 121U of phase U (i.e., radially away from the transition portion of the first double-winding coil 121W of phase W that circumferentially crosses slots 15-14).

[0089] In contrast, in the stator coil 12A of Embodiment 2, in a specific circumferential interval (refer to...) Figure 8 In the end slot of the Q8 part (in this embodiment, slots 15-10 and 15-14), such as Figure 8 As shown, the slot insertion portion of the first double-winding coil 121 of one phase is radially positioned closer to the first double-winding coil 121 of the other phases compared to the slot insertion portion of the second double-winding coil 121 of the same phase. More specifically, in slots 15-10, the slot insertion portion of the first double-winding coil 121W of phase W is inserted radially outward than the slot insertion portion of the second double-winding coil 121W of phase W (i.e., radially closer to the transition portion of the first double-winding coil 121U of phase U that is circumferentially transversely cuts into slots 15-10). Furthermore, in slots 15-14, the slot insertion portion of the first double-winding coil 121U of phase U is inserted radially inward than the slot insertion portion of the second double-winding coil 121U of phase U (i.e., radially closer to the transition portion of the first double-winding coil 121W of phase W that is circumferentially transversely cuts into slots 15-14).

[0090] In such an embodiment 2, as Figure 10 As shown, at the end slots of a specific circumferential section (in Figure 10 In the diagram, in slots 15-10 and 15-14, near the axial end face of the stator core 11, the transition portions of the first double-winding coils 121 of different phases are easily approached by each other (see reference). Figure 10 (Q10). In Figure 10 In this embodiment 2, in slots 15-10, the transition portion of the first double-winding coil 121W of phase W approaches the transition portion of the first double-winding coil 121U of phase U in the bending section that bends radially inward. Therefore, in this embodiment 2, countermeasures for phase-to-phase insulation may be locally required in the end slots of a specific circumferential section.

[0091] In contrast, according to this embodiment, such as Figure 9 As shown, at the end slots of a specific circumferential section (in Figure 9 In the diagram, in slots 15-10 and 15-14, near the axial end face of the stator core 11, the transition portions of the first double-winding coils 121 of different phases do not contact each other (see reference). Figure 9 (Q9 part). That is, by preventing the transition portions of the out-of-phase first double-winding coil 121 and the second double-winding coil 121 from coming into contact with each other, it is possible to prevent the transition portions of the out-of-phase first double-winding coils 121 from coming into contact with each other. Figure 9 In slots 15-10, the transition portion of the second double-winding coil 121W of phase W is close to the transition portion of the first double-winding coil 121U of phase U in the bending section that bends radially inward, but the transition portion of the first double-winding coil 121W of phase W can be separated from the transition portion of the first double-winding coil 121U of phase U in the radial direction.

[0092] Additionally, in this case, the end slots in a specific circumferential section (in) Figure 9 In the figure, in slots 15-10 and 15-14, in slot 15-10, two transition portions of second double-winding coils 121 are sandwiched between the transition portions of the first double-winding coils 121 of different phases, so that the radial distance between the transition portions of the first double-winding coils 121 of different phases can be increased efficiently.

[0093] Thus, according to this embodiment, the necessity for measures to counteract phase-to-phase insulation that may occur locally in relation to the end slots of a specific circumferential section can be reduced or eliminated. Therefore, for example, a structure in which phase-to-phase insulation paper is provided throughout the coil ends of the stator coil 12 can be achieved.

[0094] Furthermore, according to Embodiment 2, although there is a need for countermeasures to prevent phase-to-phase insulation that may be locally generated in relation to the end slots of a specific circumferential section, other effects of the above embodiments can be achieved.

[0095] Next, refer to Figure 4 , Figure 11 as well as Figure 12The manufacturing method of stator 10 will now be explained. Although the manufacturing method of stator 10 in the above embodiment is described here, the manufacturing method of stator 10A in embodiment 2 can also be described in the same way.

[0096] The method for manufacturing the stator 10 includes the steps of preparing the stator core 11 and the double-winding coil 121, and the winding process. The winding process includes the step of forming a multi-phase stator coil 12 by winding a plurality of double-winding coils 121 of each phase around the stator core 11.

[0097] Figure 11 as well as Figure 12 This is an explanatory diagram of the manufacturing method (stator coil 12 assembly method) of the stator 10 of the rotary electric motor according to this embodiment. Specifically, Figure 11 This is an illustrative diagram illustrating the assembly process of the first set of double-winding coils 121U-1 in phase U. Figure 12 This is an illustrative diagram illustrating the assembly process of the second set of double-winding coils 121W-2 in phase W. Figure 12 In the diagram, the assembled double-winding coils 121 are shown together in a pattern without shadows.

[0098] The first double-winding coil of phase U, 121U-1 (refer to...) Figure 4 ) includes the above three dual-winding coils 121U (in Figure 4 In this case, the coils are labeled 121U(1) to (3) respectively, forming a total of six coil sections. The second double-winding coil 121U-2 of phase U is also the same, containing the above three double-winding coils 121U (labeled 121U(4) to (6) respectively). In this case, 121U(1) and 121U(4) correspond to the first double-winding coil 121U. The same applies to the other phases (phase V and phase W).

[0099] Specifically, the assembly method of the stator coil 12 in this embodiment includes the step of firstly assembling the first group of three double-winding coils 121U-1 of phase U from the outer side along the axial direction onto the stator core 11 using an inserter (not shown).

[0100] For example, in use with Figure 2 as well as Figure 3In the case of identical dual-winding coils 121 and 121A, the inserter can achieve axial assembly by moving the first and third transition portions 1215A and 1216A of the dual-winding coils 121 and 121A from one side of the axial direction through the space on the inner diameter side of the stator core 11 relative to the stator core 11. In this case, after inserting the first slot insertion portion 1211, the second slot insertion portion 1212, the third slot insertion portion 1213, and the fourth slot insertion portion 1214 of the dual-winding coils 121 and 121A into their respective slots 15 axially, and moving the first and third transition portions 1215A and 1216A to the other side of the stator core 11, the inserter can complete the axial assembly by tilting the first and third transition portions 1215A and 1216A radially outward. Alternatively, the inserter can be used to achieve axial assembly by allowing the second and fourth transition sections 1215B and 1216B to pass through the space on the inner diameter side of the stator core 11 from one side to the other.

[0101] Here, the first set of double-winding coils 121U-1 of phase U can simultaneously assemble the above three double-winding coils 121U(1)~(3), so compared with assembling each of the above three double-winding coils 121U to the stator core 11, efficient assembly can be achieved.

[0102] exist Figure 11 The diagram schematically shows the transition lines 222U-1 and 222U-2 that connect the three double-winding coils 121U(1), 121U(2), and 121U(3) of the first set of double-winding coils 121U-1 forming phase U in series. When using with... Figure 2 as well as Figure 3 In the case of the identical double-winding coil 121 shown in the double-winding coils 121 and 121A, the transition lines 222U-1 and 222U-2 can be obtained from... Figure 2 as well as Figure 3 The ends 1210 and 1218 shown are formed. Specifically, the double-winding coil 121U(1) has a U-phase terminal 90U (see reference). Figure 4 The end 1210 of the terminal U1 is connected to the end 1218 of the double-winding coil 121U(1), which is connected to the end 1210 of another double-winding coil 121U(2) via a transition line 222U-1. The end 1218 of the other double-winding coil 121U(2) is connected to the end 1210 of another double-winding coil 121U(3) with an end 1218 connected to the neutral point UN1 via a transition line 222U-2. Furthermore, the above three double-winding coils 121U(1), 121U(2), and 121U(3) can be formed from a single continuous coil wire.

[0103] Next, the assembly method of the stator coil 12 in this embodiment includes the step of assembling the second set of three double-winding coils 121U(4) to (6) of phase U from the outer side along the axial direction onto the stator core 11 using an inserter (not shown). Furthermore, the inserter can be the same as the one used when assembling the first set of double-winding coils 121U-1 of phase U, and the assembly method can also be the same as when assembling the first set of double-winding coils 121U-1 of phase U. This is also the same for the subsequent phases V to W.

[0104] In this embodiment, after the first set of double-winding coils 121U-1 of the U phase is assembled, the second set of double-winding coils 121U-2 of the U phase can be assembled on the stator core 11 from the radial inside and from the axial outside relative to the first set of double-winding coils 121U-1 of the U phase.

[0105] Therefore, the second set of double-winding coils 121U-2 of phase U is the same as the first set of double-winding coils 121U-1 of phase U, and the three double-winding coils 121U(4), 121U(5), and 121U(6) can be assembled simultaneously (for example, in an interconnected state). Thus, compared with assembling each of the three double-winding coils 121U to the stator core 11 separately, efficient assembly can be achieved.

[0106] Furthermore, in a modified example, the first double-winding coil 121U-1 and the second double-winding coil 121U-2 of phase U can also be assembled axially onto the stator core 11 from the outside using an inserter (not shown) in a single assembly process. In this case, the first double-winding coil 121U-1 and the second double-winding coil 121U-2 of phase U can be set in the inserter using different coil wires, or they can be set in the inserter using a continuous single coil wire. The same applies to the subsequent phases V through W.

[0107] The assembly method of the stator coil 12 in this embodiment also includes the same assembly steps in the order of V phase and W phase.

[0108] For example, in the assembly process of the second set of double-winding coils 121W-2 in phase W, such as Figure 12 As shown, the second double-winding coil 121W-2 of phase W is in a specific circumferential range (refer to the first double-winding coil 121W, i.e., double-winding coil 121W(4)). Figure 5 The Q6 part is assembled in a manner that overlaps with the already assembled first double-winding coil 121U, that is, the double-winding coil 121U(1).

[0109] In addition, Figure 12The diagram schematically shows the transition lines 222W-3 and 222W-4 that connect the three double-winding coils 121W(4), 121W(5), and 121W(6) of the second double-winding coil 121W-2 forming phase W in series. When using with... Figure 2 as well as Figure 3 In the case of the same double-winding coil 121 as shown in the double-winding coils 121 and 121A, the transition lines 222W-3 and 222W-4 can be obtained from... Figure 2 as well as Figure 3 The ends 1210 and 1218 shown are formed. Specifically, the end 1218 of the double-winding coil 121W(6) having the end 1210 connected to the neutral point WN2 is continuous with the end 1210 of another double-winding coil 121W(5) via transition line 222W-3. The end 1218 of this other double-winding coil 121W(5) is continuous with the end 1210 of another double-winding coil 121W(4) via transition line 222W-4. The other double-winding coil 121W(4) has a terminal 90W formed with the W phase terminal (refer to...). Figure 4 End 1218 of the endpoint W2 connected to.

[0110] Thus, in this embodiment, the winding process can be implemented by including the steps of overlapping the first dual-winding coil 121U of phase U and the first dual-winding coil 121W of phase W in a specific circumferential interval and inserting the first dual-winding coils 121W of different phases into different slots 15.

[0111] Next, refer to Figure 13 To illustrate another embodiment.

[0112] Figure 13 This is a cross-sectional view showing the configuration of the stator coils 12B of the stator 10B in another embodiment (hereinafter referred to as "Embodiment 3"). Figure 13 In, with Figure 5 Similarly, only the first dual-winding coil 121 of the dual-winding coils 121 is marked with a shaded line.

[0113] The stator coil 12B of stator 10B in Embodiment 3 is the same as the stator coil 12 in this embodiment in that it is formed by winding multiple double-winding coils 121 around the stator core 11 in a phase-by-phase manner, but the configuration of the multiple double-winding coils 121 is different.

[0114] Specifically, in the above embodiments, all the dual-winding coils 121 of phase U are arranged radially outward compared to the dual-winding coils 121 of other phases, and all the dual-winding coils 121 of phase W are arranged radially inward compared to the dual-winding coils 121 of other phases. However, in embodiment 3, a portion of the plurality of dual-winding coils 121 are arranged in a manner that produces a back-and-forth movement between phases in a radially inward and outward manner.

[0115] Specifically, in the dual-winding coil 121 of the above embodiment, in any short-pitch winding slot, the inner coil portion of the U-phase dual-winding coil 121U is located radially outward, and the inner coil portion of the W-phase dual-winding coil 121W is located radially inward. As a result, in any short-pitch winding slot, the inner coil portion of the V-phase dual-winding coil 121V is located radially inward of the inner coil portion of the dual-winding coil 121U, or radially outward of the inner coil portion of the dual-winding coil 121W.

[0116] In contrast, in the dual-winding coil 121 of Embodiment 3, in addition to the plurality of dual-winding coils 121 extending into a specific circumferential region (described later), the slot insertion portion on the circumferential side of the inner coil portion (in) Figure 2 In the case of the dual-winding coil 121 shown, the second slot insertion portion 1212 or the third slot insertion portion 1213 is inserted radially outward compared to the slot insertion portions of other phases, while the slot insertion portion on the other circumferential side is inserted radially inward compared to the slot insertion portions of other phases. For example, in one of the six dual-winding coils 121U, in... Figure 1 In slot 15-3, a dual-winding coil 121U corresponding to the star mark is inserted radially outward compared to the dual-winding coil 121W of phase W inserted into that slot, and radially inward compared to the dual-winding coil 121V of phase V inserted into that slot. Similarly, in the dual-winding coil 121 of embodiment 3, in addition to the plurality of dual-winding coils 121 extending into a specific circumferential range (described later), the slot insertion portion on the circumferential side of the outer coil portion (in... Figure 2 In the case of the dual-winding coil 121 shown, the first slot insertion part 1211 or the fourth slot insertion part 1214 is inserted radially outward than the other slot insertion parts of the same phase, and the slot insertion part on the other side of the circumference is inserted radially inward than the other slot insertion parts of the same phase.

[0117] Even in the stator coil 12B implemented by such a configuration of multiple double-winding coils 121, the configuration of the first double-winding coil 121 (i.e., the double-winding coil 121 on the side furthest from the neutral point) can be implemented in the same way as in the above embodiment, so as to reduce or eliminate the necessity of measures for phase-to-phase insulation.

[0118] Specifically, even in embodiment 3, the first double-winding coil 121U of phase U and the first double-winding coil 121V of phase V are also in a specific circumferential range (refer to...). Figure 13 The Q13 part overlaps, and as Figure 13 As shown, the first double-winding coils 121 of different phases are inserted into different slots 15.

[0119] More specifically, the two first double-winding coils 121U of phase U extend circumferentially from slots 15-32 to slots 15-8 in a clockwise direction; the two first double-winding coils 121V of phase V extend circumferentially from slots 15-24 to slots 15-36; and the two first double-winding coils 121W of phase W extend circumferentially from slots 15-10 to slots 15-22. Therefore, in this case, the circumferential intervals from slots 15-32 to slots 15-36 corresponding to the five slots become specific circumferential intervals where the first double-winding coils 121U of phase U and the first double-winding coils 121V of phase V overlap.

[0120] In addition, the two first double-winding coils 121U of phase U are inserted into slots 15-2, 15-3, 15-7, 15-8, 15-32, 15-33 and 15-1, and the two first double-winding coils 121V of phase V are inserted into slots 15-24, 15-25, 15-29, 15-30, 15-31, 15-35 and 15-36. Moreover, the two first double-winding coils 121W of phase W are inserted into slots 15-10, 15-11, 15-15, 15-16, 15-17, 15-21 and 15-22. In this way, the two first double-winding coils 121U of phase U are inserted into slots 15 that are different from the two first double-winding coils 121V of phase V and the two first double-winding coils 121W of phase W.

[0121] Thus, even in Embodiment 3, as described above, in the circumferential direction, only the first double-winding coil 121U of phase U and the first double-winding coil 121V of phase V overlap within a specific circumferential interval, making it easy to ensure the insulation of the coil ends in other circumferential intervals. Therefore, in circumferential intervals outside the specific circumferential interval, the necessity for phase-to-phase insulation measures can be reduced or eliminated. Consequently, for example, it is possible to achieve a structure in which phase-to-phase insulating paper is not provided in circumferential intervals outside the specific circumferential intervals throughout the entire circumference of the stator coil 12B.

[0122] Furthermore, even in embodiment 3, such as Figure 13As shown, within a specific circumferential interval, the transition portion of the second double-winding coil 121W is arranged radially between the transition portion of the first double-winding coil 121U of phase U and the transition portion of the first double-winding coil 121V of phase V. Thus, although the first double-winding coil 121U of phase U and the first double-winding coil 121V of phase V overlap radially within the specific circumferential interval, they are not directly adjacent radially. Therefore, even within the specific circumferential interval, the necessity for phase-to-phase insulation measures can be reduced or eliminated. Thus, for example, a structure can be achieved where phase-to-phase insulation paper is not provided even within a specific circumferential interval throughout the entire circumference of the stator coil 12B.

[0123] Furthermore, even in Embodiment 3, the first double-winding coils 121 of different phases are not inserted into the same slot 15, so the necessity for phase-to-phase insulation measures can be reduced or eliminated in all slots 15. Thus, for example, a structure can be achieved that does not require phase-to-phase insulation paper to be provided in all slot insertion portions of the stator coil 12B.

[0124] Furthermore, even in Embodiment 3, in the end slots of a specific circumferential section, namely slots 15-32 and 15-36 (an example of a specific slot), the transition portions of the first double-winding coils 121 of different phases do not contact each other. That is, in slot 15-32, the first double-winding coil 121U of phase U is arranged radially inward (on the side radially away from the first double-winding coil 121V of phase V) compared to the second double-winding coil 121U of phase U, and in slot 15-36, the first double-winding coil 121V of phase V is arranged radially outward (on the side radially away from the first double-winding coil 121U of phase U) compared to the second double-winding coil 121V of phase V. Therefore, even in Embodiment 3, compared to the reference... Figure 9 Similar to the above embodiment, by having the transition portions of the first double-winding coil 121 and the second double-winding coil 121 of different phases come into contact with each other, it is possible to prevent the transition portions of the first double-winding coil 121 of different phases from coming into contact with each other.

[0125] Thus, even in Embodiment 3, the necessity for countermeasures against phase-to-phase insulation that may occur locally in relation to the end slots of a specific circumferential section can be reduced or eliminated. Consequently, for example, a structure can be achieved where the entire coil end of the stator coil 12B is free of phase-to-phase insulation paper.

[0126] However, in a modified example, in slots 15-32, the first double-winding coil 121U of phase U can also be configured radially outward (on the side that is radially closer to the first double-winding coil 121V of phase V) than the second double-winding coil 121U of phase U, and / or in slots 15-36, the first double-winding coil 121V of phase V can also be configured radially inward (on the side that is radially closer to the first double-winding coil 121U of phase U) than the second double-winding coil 121V of phase V.

[0127] While the embodiments have been described in detail above, they are not limited to specific embodiments. Various modifications and alterations are possible within the scope of the technical solutions described. Furthermore, all or more of the structural components of the above embodiments can be combined. Additionally, the effects of subordinate items in the effects of each embodiment are additional effects distinct from the higher-level concepts (independent items).

[0128] For example, in the above embodiments, the structure of a three-phase six-pole 36-slot configuration is illustrated and explained, so the specific circumferential interval is the interval corresponding to five slots. However, in other configurations, the specific circumferential interval often becomes the interval corresponding to fewer or more slots.

[0129] Furthermore, the above embodiments can reduce or eliminate the necessity of phase-to-phase insulation measures. As a result, a structure that does not require phase-to-phase insulation paper can be achieved. However, as a countermeasure other than phase-to-phase insulation paper, phase-to-phase insulation measures based on varnish, resin, etc., can also be implemented.

[0130] Explanation of reference numerals in the attached figures

[0131] 10, 10A, 10B… Stator (stator for rotating motor), 11… Stator core, 12, 12A, 12B… Stator coil, 15… Slot, 121… Double winding coil, 1211… First slot insertion part, 1212, 1212A… Second slot insertion part, 1213… Third slot insertion part, 1214, 1214A… Fourth slot insertion part, 1215A… First transition part, 1215B… Second transition part, 1216A… Third transition part, 1216B… Fourth transition part.

Claims

1. A stator for a rotary electric machine, comprising: Stator core, which has multiple slots; and The stator coil is formed by winding multiple double-winding coils, each comprising two coil portions that are closed when viewed radially, in a phase-by-phase manner, around the aforementioned stator core. The two coil portions of a dual-winding coil are respectively connected by slot insertion portions on both circumferential sides of different slots, and axial transition portions extending circumferentially between the ends of the slot insertion portions on both circumferential sides, to form the closed coil shape. Multiple dual-winding coils are inserted into slots such that the slot insertion portion of one dual-winding coil is radially adjacent to the slot insertion portions of other dual-winding coils. Each phase's double-winding coil includes a first double-winding coil on the side furthest from the neutral point, and a second double-winding coil elsewhere. The combination of only the first double-winding coil of the first phase, the first double-winding coil of the second phase, and the first double-winding coil of the third phase overlaps in a specific circumferential interval corresponding to at least one slot, and the slot insertion portions of the first double-winding coils of different phases are inserted into different slots.

2. The stator for a rotary electric machine according to claim 1, wherein, The transition portion of the second double-winding coil of the third phase is radially disposed between the transition portion of the first double-winding coil of the first phase and the transition portion of the first double-winding coil of the second phase within the specific circumferential interval.

3. The stator for a rotary electric machine according to claim 2, wherein, The multiple slots include: specific slots within the aforementioned specific circumferential interval for insertion of the aforementioned first dual-winding coil of the first phase and the aforementioned second dual-winding coil of the first phase. At the circumferential position of the aforementioned specific slot, the second double-winding coil of the first phase is radially disposed between the first double-winding coil of the first phase and the first double-winding coil of the second phase.

4. The stator for a rotary electric machine according to claim 3, wherein, At the circumferential position of the aforementioned specific slot, the second double-winding coil of the third phase is radially positioned between the second double-winding coil of the first phase and the first double-winding coil of the second phase.

5. A method for manufacturing a stator for a rotary electric machine, comprising the following steps: The process of preparing a stator core with multiple slots; The process of preparing multiple concentric double-winding coils with long and short circumference coil sections; and The winding process of forming a multi-phase stator coil by winding multiple of the aforementioned dual-winding coils around the stator core in a complete circle is described. Each phase of the aforementioned double-winding coil includes: a first double-winding coil on the side furthest from the neutral point, and a second double-winding coil elsewhere. The above-mentioned winding process includes: making the combination of only the first double-winding coil of the first phase, the first double-winding coil of the second phase, and the first double-winding coil of the third phase overlap in a specific circumferential interval corresponding to at least one slot, and inserting the first double-winding coils of different phases into different slots.

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