Stator assembly, motor and vehicle

Abstract

The utility model discloses a stator assembly, a motor and a vehicle, and the stator assembly comprises a stator core which is provided with a plurality of stator grooves which are arranged at intervals along the circumferential direction, the plurality of stator grooves comprise a first stator groove and a second stator groove, and the first stator groove and the second stator groove are respectively provided with a plurality of groove layers which are arranged in the radial direction of the stator core; the first U-shaped hairpin group comprises a first U-shaped hairpin and a second U-shaped hairpin, one end of the first U-shaped hairpin and one end of the second U-shaped hairpin are arranged in at least one groove layer of the first stator groove in a penetrating mode, and the other end of the first U-shaped hairpin and the other end of the second U-shaped hairpin are arranged in the same groove layer of the second stator groove in a penetrating mode. The first U-shaped hairpin is positioned on the radial outer side of the second U-shaped hairpin; in the second stator groove, the first U-shaped hairpin is located on the radial inner side of the second U-shaped hairpin. According to the stator assembly of the utility model, the skin effect and eddy current loss can be reduced, the voltage difference can be balanced, the circulation loss can be reduced, and the motor efficiency can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field more particularly, relate to a kind of stator assembly, motor and vehicle. BACKGROUND

[0002] In the related art, when the stator winding is in an alternating magnetic field, eddy current loss, skin effect and proximity effect can occur in the stator winding, thereby reducing the efficiency of the motor. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art. To this end, one object of the utility model is to provide a stator assembly that can reduce skin effect and eddy current loss and balance voltage difference, thereby reducing circulating current loss and effectively improving motor efficiency.

[0004] Another object of the utility model is to provide a motor having the above stator assembly.

[0005] Yet another object of the utility model is to provide a vehicle having the above motor.

[0006] The stator assembly according to the utility model embodiment comprises: a stator core having a plurality of stator slots arranged at intervals along a circumferential direction of the stator core, the plurality of stator slots including a first stator slot and a second stator slot, the first stator slot and the second stator slot each having a plurality of slot layers arranged in a radial direction of the stator core; and a stator winding comprising a first U-shaped hairpin group, the first U-shaped hairpin group including a first U-shaped hairpin and a second U-shaped hairpin, one end of the first U-shaped hairpin and the second U-shaped hairpin being threaded in at least one slot layer of the first stator slot, the other end of the first U-shaped hairpin and the second U-shaped hairpin being threaded in the same slot layer of the second stator slot, wherein, in the first stator slot, the first U-shaped hairpin is located radially outward of the second U-shaped hairpin; and in the second stator slot, the first U-shaped hairpin is located radially inward of the second U-shaped hairpin.

[0007] According to the stator assembly provided in the embodiment of the present application, one end of the first U-shaped hairpin and the second U-shaped hairpin is arranged in at least one slot layer of the first stator slot, the other end of the first U-shaped hairpin and the second U-shaped hairpin is arranged in the same slot layer of the second stator slot, the first U-shaped hairpin is located at the radial outer side of the second U-shaped hairpin in the first stator slot, and the first U-shaped hairpin is located at the radial inner side of the second U-shaped hairpin in the second stator slot, so that the cross-sectional area of a single stator winding conductor can be reduced, the stator winding loss caused by the skin effect and the eddy current loss can be reduced, transposition of the first U-shaped hairpin and the second U-shaped hairpin can be realized, the voltage difference between the first U-shaped hairpin and the second U-shaped hairpin can be effectively balanced, the circulating current loss can be reduced, and the motor efficiency can be effectively improved.

[0008] In addition, the stator assembly provided in the above embodiment of the present application can further have the following additional technical features.

[0009] According to the stator assembly provided in some embodiments of the present application, the first U-shaped hairpin comprises a first sub-U-shaped hairpin and a second sub-U-shaped hairpin, the second U-shaped hairpin comprises a third sub-U-shaped hairpin and a fourth sub-U-shaped hairpin, one end of the first sub-U-shaped hairpin, the second sub-U-shaped hairpin, the third sub-U-shaped hairpin and the fourth sub-U-shaped hairpin is arranged in at least one slot layer of the first stator slot, the other end of the first sub-U-shaped hairpin, the second sub-U-shaped hairpin, the third sub-U-shaped hairpin and the fourth sub-U-shaped hairpin is arranged in the same slot layer of the second stator slot, one end of the first sub-U-shaped hairpin in the first stator slot and one end of the first sub-U-shaped hairpin in the second stator slot are located on the same side of the second sub-U-shaped hairpin, and one end of the fourth sub-U-shaped hairpin in the first stator slot and one end of the fourth sub-U-shaped hairpin in the second stator slot are located on the same side of the third sub-U-shaped hairpin, wherein, in the first stator slot, the first sub-U-shaped hairpin and the fourth sub-U-shaped hairpin are opposite in the radial direction; in the second stator slot, the first sub-U-shaped hairpin and the fourth sub-U-shaped hairpin are opposite in the radial direction.

[0010] According to some embodiments of the present application, a first insulation layer is arranged on the outer peripheral wall of at least one of the first sub-U-shaped hairpin, the second sub-U-shaped hairpin, the third sub-U-shaped hairpin and the fourth sub-U-shaped hairpin.

[0011] According to some embodiments of the present application, the stator winding further comprises a second U-shaped hairpin group, and two ends of the second U-shaped hairpin group are arranged in two adjacent slot layers of the first stator slot and the second stator slot respectively.

[0012] According to some embodiments of the utility model, one of the two adjacent slot layers of the first stator slot and the second stator slot is a first installation layer and the other is a second installation layer, the second U-shaped hairpin group includes a third U-shaped hairpin and a fourth U-shaped hairpin, the third U-shaped hairpin and the fourth U-shaped hairpin are arranged in the first installation layer and the second installation layer respectively, wherein, in the first installation layer, the third U-shaped hairpin is located on the radial outer side of the fourth U-shaped hairpin, and in the second installation layer, the third U-shaped hairpin is located on the radial inner side of the fourth U-shaped hairpin.

[0013] According to some embodiments of the utility model, the stator winding further includes a third U-shaped hairpin group, both ends of the third U-shaped hairpin group are arranged in the two adjacent slot layers of the first stator slot and the second stator slot respectively, wherein, in the first stator slot, the second U-shaped hairpin group is located on the radial inner side of the third U-shaped hairpin group, and in the second stator slot, the second U-shaped hairpin group is located on the radial outer side of the third U-shaped hairpin group.

[0014] According to some embodiments of the utility model, the second U-shaped hairpin group and the third U-shaped hairpin group are a plurality of groups arranged along the radial direction of the stator core.

[0015] According to some embodiments of the utility model, each stator slot has M slot layers arranged in the radial direction, the slot layer located at the most radial inner end in each stator slot is a first slot layer, the slot layer located at the most radial outer end is an Mth slot layer, and at least one of the first slot layer and the Mth slot layer is provided with the first U-shaped hairpin group.

[0016] According to some embodiments of the utility model, when the first U-shaped hairpin group is arranged in the first slot layer, the stator assembly further includes a seventh U-shaped hairpin, one end of the seventh U-shaped hairpin is arranged in the remaining slot layers of the first stator slot, and the other end of the seventh U-shaped hairpin is arranged in the remaining slot layers of the second stator slot.

[0017] According to some embodiments of the utility model, a second insulation layer is arranged on the outer peripheral wall of the first U-shaped hairpin group, and / or a third insulation layer is arranged on the outer peripheral wall of at least one of the first U-shaped hairpin and the second U-shaped hairpin.

[0018] The motor according to the embodiments of the utility model includes the stator assembly according to the embodiments of the utility model.

[0019] According to the motor of the embodiment of the utility model, one end of first U type hairpin and second U type hairpin is arranged in at least one slot layer of first stator slot, the other end of first U type hairpin and second U type hairpin is arranged in the same slot layer of second stator slot, first U type hairpin is located at the radial outside of second U type hairpin in first stator slot, first U type hairpin is located at the radial inside of second U type hairpin in second stator slot, the cross section area of a single stator winding conductor can be reduced, the stator winding loss caused by skin effect and eddy current loss can be reduced, transposition of first U type hairpin and second U type hairpin can be realized, the voltage difference between first U type hairpin and second U type hairpin is effectively balanced, circulating loss is reduced, and motor efficiency can be effectively improved.

[0020] The vehicle according to the embodiment of the utility model comprises the motor according to the embodiment of the utility model.

[0021] According to the motor of the embodiment of the utility model, one end of first U type hairpin and second U type hairpin is arranged in at least one slot layer of first stator slot, the other end of first U type hairpin and second U type hairpin is arranged in the same slot layer of second stator slot, first U type hairpin is located at the radial outside of second U type hairpin in first stator slot, first U type hairpin is located at the radial inside of second U type hairpin in second stator slot, the cross section area of a single stator winding conductor can be reduced, the stator winding loss caused by skin effect and eddy current loss can be reduced, transposition of first U type hairpin and second U type hairpin can be realized, the voltage difference between first U type hairpin and second U type hairpin is effectively balanced, circulating loss is reduced, and motor efficiency can be effectively improved.

[0022] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0024] Figure 1 It is the winding schematic view of the stator assembly according to the first embodiment of the utility model;

[0025] Figure 2 It is the structure schematic view of the stator assembly according to the second embodiment of the utility model;

[0026] Figure 3 It is the winding schematic view of the stator assembly according to the second embodiment of the utility model;

[0027] Figure 4is a winding schematic view of a stator assembly according to a third embodiment of the utility model;

[0028] Figure 5 is a structural schematic view of a first U-shaped hairpin group according to an embodiment of the utility model;

[0029] Figure 6 is a structural schematic view of a seventh U-shaped hairpin according to an embodiment of the utility model.

[0030] Reference signs:

[0031] 100, stator assembly;

[0032] 10, stator core; 11, stator slot; 111, first stator slot; 112, second stator slot;

[0033] 20, stator winding; 21, first U-shaped hairpin group; 22, second U-shaped hairpin group; 23, third U-shaped hairpin group; 25, seventh U-shaped hairpin; 211, first U-shaped hairpin; 212, second U-shaped hairpin; 221, third U-shaped hairpin; 222, fourth U-shaped hairpin; 231, fifth U-shaped hairpin; 232, sixth U-shaped hairpin;

[0034] 30, slot layer; 31, first sub-slot layer; 32, second sub-slot layer; 33, third sub-slot layer; 34, fourth sub-slot layer; 35, fifth sub-slot layer; 36, sixth sub-slot layer; 37, ninth sub-slot layer; 38, tenth sub-slot layer; 39, eleventh sub-slot layer; 310, twelfth sub-slot layer; 301, first installation layer; 302, second installation layer; 303, third installation layer; 304, fourth installation layer; 311, first slot sublayer; 312, second slot sublayer; 321, third slot sublayer; 322, fourth slot sublayer;

[0035] 41, first sub-U-shaped hairpin; 42, second sub-U-shaped hairpin; 43, third sub-U-shaped hairpin; 44, fourth sub-U-shaped hairpin;

[0036] 51, first slot layer; 52, Mth slot layer; 521, seventh sub-slot layer; 522, eighth sub-slot layer. DETAILED DESCRIPTION

[0037] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0038] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0039] In the description of the utility model, "first feature", "second feature" can include one or more features, the meaning of "multiple" is two or more than two, and "above" or "below" the first feature in the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them, and "above", "above" and "above" the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.

[0040] The stator assembly 100 according to the embodiment of the utility model will be described below with reference to the drawings.

[0041] Referring to Figures 1-4 As shown in the figure, the stator assembly 100 according to the embodiment of the utility model can include: a stator core 10 and a stator winding 20.

[0042] Specifically, the stator core 10 has a plurality of (equal to or greater than two) stator slots 11, the plurality of stator slots 11 are arranged at intervals along the circumferential direction of the stator core 10, the plurality of stator slots 11 include a first stator slot 111 and a second stator slot 112, the first stator slot 111 and the second stator slot 112 both have a plurality of slot layers 30 arranged in the radial direction of the stator core 10, and through the plurality of stator slots 11 and the plurality of slot layers 30, different winding layouts of the stator winding 20 in the stator core 10 can be realized, different design requirements of the stator assembly 100 can be met, and the flexibility of the design of the stator assembly 100 can be realized.

[0043] In addition, as Figures 1-5As shown, the stator winding 20 comprises a first U-shaped hairpin group 21, the first U-shaped hairpin group 21 comprises a first U-shaped hairpin 211 and a second U-shaped hairpin 212, one end of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is arranged in at least one slot layer 30 of the first stator slot 111, and the other end of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is arranged in the same slot layer 30 of the second stator slot 112, so that the first U-shaped hairpin group 21 can be fixed on the stator core 10.

[0044] Since the eddy current loss and the skin effect depend on the cross-sectional area of the stator winding 20 conductor, in the utility model, the first U-shaped hairpin group 21 is formed by the first U-shaped hairpin 211 and the second U-shaped hairpin 212, so that the cross-sectional area of a single stator winding 20 conductor can be reduced, thereby the eddy current loss and the skin effect can be reduced, for example, the flat wire eddy current loss caused by the skin effect due to the high-frequency change of the magnetic field in the high-speed interval of the motor can be reduced, so that the efficiency of the motor is improved.

[0045] The inventor of the present application finds that reducing the cross-sectional area of the stator winding 20 conductor can increase the direct current resistance, so that the loss is easily increased. Therefore, in the utility model, in the first stator slot 111, the first U-shaped hairpin 211 is located on the radial outer side of the second U-shaped hairpin 212; in the second stator slot 112, the first U-shaped hairpin 211 is located on the radial inner side of the second U-shaped hairpin 212. Due to the uneven distribution of the magnetic field of the stator assembly 100, there is a voltage difference between the first U-shaped hairpin 211 and the second U-shaped hairpin 212, by transposing the first U-shaped hairpin 211 and the second U-shaped hairpin 212, the current directions in the first U-shaped hairpin 211 and the second U-shaped hairpin 212 can be different, so that the voltage in the first U-shaped hairpin 211 can be offset by the voltage in the second U-shaped hairpin 212, the alternating current loss of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 can be reduced, so that the voltage difference between the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is balanced, the circulating current loss is reduced, and the efficiency of the motor can be further improved.

[0046] It should be noted that the "transposition of the first U-shaped hairpin 211 and the second U-shaped hairpin 212" here means that in the first stator slot 111, the first U-shaped hairpin 211 is located on the radial outer side of the second U-shaped hairpin 212; in the second stator slot 112, the first U-shaped hairpin 211 is located on the radial inner side of the second U-shaped hairpin 212.

[0047] In some embodiments, the stator winding 20 adopts a flat copper wire, which can more closely fill the space of the stator slot 11, effectively improve the slot fill rate, so that the power density and efficiency of the motor can be improved, and different use requirements can be met.

[0048] According to the stator assembly 100 of the embodiment of the utility model, one end of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is arranged in the at least one slot layer 30 of the first stator slot 111, the other end of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is arranged in the same slot layer 30 of the second stator slot 112, the first U-shaped hairpin 211 is located at the radial outer side of the second U-shaped hairpin 212 in the first stator slot 111, the first U-shaped hairpin 211 is located at the radial inner side of the second U-shaped hairpin 212 in the second stator slot 112, the cross-sectional area of a single stator winding 20 conductor can be reduced, thereby the stator winding 20 loss caused by skin effect and eddy current loss can be reduced, and transposition of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 can be realized, the voltage difference between the first U-shaped hairpin 211 and the second U-shaped hairpin 212 can be effectively balanced, the circulating current loss can be reduced, and the motor efficiency can be effectively improved.

[0049] In the embodiment of the utility model, the specific structure of the first U-shaped hairpin group 21 can be set according to actual conditions. For example, the first U-shaped hairpin group 21 can be a field-shaped combined wire or a double-layer combined wire, etc.

[0050] For example, in some embodiments, as shown in Figure 1 The first U-shaped hairpin 211 includes a first sub U-shaped hairpin 41 and a second sub U-shaped hairpin 42, and the second U-shaped hairpin 212 includes a third sub U-shaped hairpin 43 and a fourth sub U-shaped hairpin 44. One end of the first sub U-shaped hairpin 41, the second sub U-shaped hairpin 42, the third sub U-shaped hairpin 43 and the fourth sub U-shaped hairpin 44 is arranged in the at least one slot layer 30 of the first stator slot 111, the other end of the first sub U-shaped hairpin 41, the second sub U-shaped hairpin 42, the third sub U-shaped hairpin 43 and the fourth sub U-shaped hairpin 44 is arranged in the same slot layer 30 of the second stator slot 112, the one end of the first sub U-shaped hairpin 41 in the first stator slot 111 and the one end of the first sub U-shaped hairpin 41 in the second stator slot 112 are located at the same side of the second sub U-shaped hairpin 42, and the one end of the fourth sub U-shaped hairpin 44 in the first stator slot 111 and the one end of the fourth sub U-shaped hairpin 44 in the second stator slot 112 are located at the same side of the third sub U-shaped hairpin 43. Wherein, in the first stator slot 111, the first sub U-shaped hairpin 41 and the fourth sub U-shaped hairpin 44 are opposite in the radial direction; in the second stator slot 112, the first sub U-shaped hairpin 41 and the fourth sub U-shaped hairpin 44 are opposite in the radial direction.

[0051] Therefore, the first U-shaped hairpin group 21 can be wound on the stator core 10, realizing different winding methods for the stator core 10, making the winding more flexible. Furthermore, the first U-shaped hairpin 211 is formed by the first sub-U-shaped hairpin 41 and the second sub-U-shaped hairpin 42, and the second U-shaped hairpin 212 is formed by the third sub-U-shaped hairpin 43 and the fourth sub-U-shaped hairpin 44. This can further reduce the cross-sectional area of ​​the conductor of the stator winding 20, effectively reduce eddy current loss and skin effect, and improve motor efficiency. Moreover, the current directions in the first sub-U-shaped hairpin 41, the second sub-U-shaped hairpin 42, the third sub-U-shaped hairpin 43, and the fourth sub-U-shaped hairpin 44 are different, so that the voltages in the first sub-U-shaped hairpin 41, the second sub-U-shaped hairpin 42, the third sub-U-shaped hairpin 43, and the fourth sub-U-shaped hairpin 44 can cancel each other out, thereby balancing the voltage difference between them, which helps to reduce circulating current loss and improve motor efficiency.

[0052] For example, such as Figure 1 As shown, the first stator slot 111 and the second stator slot 112 each have six slot layers 30 arranged in the radial direction of the stator core 10. The six slot layers 30 of the first stator slot 111 and the second stator slot 112 include a first slot layer 51, and the first slot layer 51 includes a first sub-slot layer 31 and a second sub-slot layer 32. The first sub-slot layer 31 includes a first sub-slot layer 311 and a second sub-slot layer 312. The second sub-slot layer 32 includes a third sub-slot layer 321 and a fourth sub-slot layer 322. The third sub-slot layer 321 of the first stator slot 111 is formed at position A1, the fourth sub-slot layer 322 of the first stator slot 111 is formed at position A2, the second sub-slot layer 312 of the first stator slot 111 is formed at position A3, the first sub-slot layer 311 of the first stator slot 111 is formed at position A4, the first sub-slot layer 311 of the second stator slot 112 is formed at position A1+n, the second sub-slot layer 312 of the second stator slot 112 is formed at position A2+n, the fourth sub-slot layer 322 of the second stator slot 112 is formed at position A3+n, and the third sub-slot layer 321 of the second stator slot 112 is formed at position A4+n.

[0053] The stator winding 20 includes a first U-shaped hairpin group 21, which includes a first U-shaped hairpin 211 and a second U-shaped hairpin 212. The first U-shaped hairpin 211 includes a first sub-U-shaped hairpin 41 and a second sub-U-shaped hairpin 42. The second U-shaped hairpin 212 includes a third sub-U-shaped hairpin 43 and a fourth sub-U-shaped hairpin 44. The span of the first sub-U-shaped hairpin 41, the second sub-U-shaped hairpin 42, the third sub-U-shaped hairpin 43 and the fourth sub-U-shaped hairpin 44 is n.

[0054] One end of the first sub U-shaped hairpin 41 is located at the A1 position, the other end of the first sub U-shaped hairpin 41 is located at the A1+n position after transposition, one end of the second sub U-shaped hairpin 42 is located at the A2 position, the other end of the second sub U-shaped hairpin 42 is located at the A2+n position, one end of the third sub U-shaped hairpin 43 is located at the A3 position, the other end of the third sub U-shaped hairpin 43 is located at the A3+n position, one end of the fourth sub U-shaped hairpin 44 is located at the A4 position, and the other end of the fourth sub U-shaped hairpin 44 is located at the A4+n position, so as to realize the winding of the stator winding 20 on the stator core 10.

[0055] It should be noted that the "span" refers to the difference between two slot numbers, for example, the span between the two stator slot 11 inner parts is 8, if one end of the first U-shaped hairpin 211 is inserted into the first stator slot 11, the other end is inserted into the ninth stator slot 11, wherein the initially inserted stator slot 11 is the first stator slot, and the explanation of "span" will continue below.

[0056] In some embodiments of the utility model, the outer peripheral wall of at least one of the first sub U-shaped hairpin 41, the second sub U-shaped hairpin 42, the third sub U-shaped hairpin 43 and the fourth sub U-shaped hairpin 44 is provided with a first insulating layer, which can realize the required insulation requirement, avoid short circuit and leakage and other problems, and effectively improve the safety and reliability of the motor.

[0057] According to some embodiments of the utility model, Figure 3 As shown in the figure, Figure 4 The stator winding 20 further comprises a second U-shaped hairpin group 22, both ends of the second U-shaped hairpin group 22 are respectively arranged in the adjacent two slot layers 30 of the first stator slot 111 and the second stator slot 112, which can realize the cross-layer winding of the second U-shaped hairpin group 22, further improve the loss effect, and improve the motor efficiency.

[0058] In some embodiments of the utility model, Figure 3 As shown in the figure, Figure 4As shown, one of the two adjacent slot layers 30 of the first stator slot 111 and the second stator slot 112 is the first mounting layer 301, and the other of the two adjacent slot layers 30 of the first stator slot 111 and the second stator slot 112 is the second mounting layer 302. The second U-shaped hairpin group 22 includes a third U-shaped hairpin 221 and a fourth U-shaped hairpin 222. One end of the third U-shaped hairpin 221 and the fourth U-shaped hairpin 222 are both inserted into the first mounting layer 301, and the other end of the third U-shaped hairpin 221 and the fourth U-shaped hairpin 222 are inserted into the second mounting layer 302, which can realize different winding layouts of the stator winding 20 in the stator core 10. At the same time, by forming the second U-shaped hairpin group 22 with the third U-shaped hairpin 221 and the fourth U-shaped hairpin 222, the cross-sectional area of ​​the conductor of the stator winding 20 can be reduced, effectively reducing eddy current losses and skin effect, and improving motor efficiency.

[0059] Among them, such as Figure 3 and Figure 4 As shown, within the first mounting layer 301, the third U-shaped hairpin 221 is located radially outside the fourth U-shaped hairpin 222; within the second mounting layer 302, the third U-shaped hairpin 221 is located radially inside the fourth U-shaped hairpin 222. This allows for the interchange of the third U-shaped hairpin 221 and the fourth U-shaped hairpin 222, resulting in different current directions within them. This allows the voltage within the third U-shaped hairpin 221 to cancel out the voltage within the fourth U-shaped hairpin 222, reducing AC losses and balancing the voltage difference between them. This facilitates reducing circulating current losses and improving motor efficiency.

[0060] It should be noted that the "interchange of position between the third U-shaped hairpin 221 and the fourth U-shaped hairpin 222" here means that within the first mounting layer 301, the third U-shaped hairpin 221 is located radially outside the fourth U-shaped hairpin 222; and within the second mounting layer 302, the third U-shaped hairpin 221 is located radially inside the fourth U-shaped hairpin 222.

[0061] According to some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the stator winding 20 also includes a third U-shaped hairpin group 23. The two ends of the third U-shaped hairpin group 23 are respectively inserted into two adjacent slot layers 30 of the first stator slot 111 and the second stator slot 112, which can realize cross-layer winding of the third U-shaped hairpin group 23, further improve the loss effect, and improve the motor efficiency.

[0062] Among them, such as Figure 3 and Figure 4As shown, in the first stator slot 111, the second U-shaped hairpin group 22 is located radially inside the third U-shaped hairpin group 23; in the second stator slot 112, the second U-shaped hairpin group 22 is located radially outside the third U-shaped hairpin group 23, so that the second U-shaped hairpin group 22 and the third U-shaped hairpin group 23 can be cross-wound, ensuring compact structure and realizing different winding modes.

[0063] In some embodiments, as Figure 3 With Figure 4 As shown, one of the two adjacent slot layers 30 of the first stator slot 111 and the second stator slot 112 is the third installation layer 303, and the other is the fourth installation layer 304, the third installation layer 303 is located radially outside the first installation layer 301, and the fourth installation layer 304 is located radially inside the second installation layer 302. The third U-shaped hairpin group 23 includes the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232, one end of the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232 is arranged in the third installation layer 303, and the other end of the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232 is arranged in the fourth installation layer 304, which can realize different winding layouts of the stator winding 20 in the stator core 10. At the same time, by forming the third U-shaped hairpin group 23 by the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232, the cross-sectional area of the stator winding 20 conductor can be reduced, the eddy current loss and skin effect can be effectively reduced, and the motor efficiency can be improved.

[0064] Among them, as Figure 3 With Figure 4 As shown, in the third installation layer 303, the fifth U-shaped hairpin 231 is located radially inside the sixth U-shaped hairpin 232; in the fourth installation layer 304, the fifth U-shaped hairpin 231 is located radially outside the sixth U-shaped hairpin 232, which can realize transposition of the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232, so that the current directions in the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232 are different, the voltage in the fifth U-shaped hairpin 231 can be offset by the voltage in the sixth U-shaped hairpin 232, the alternating current loss of the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232 can be reduced, thereby balancing the voltage difference between the fifth U-shaped hairpin 231 and the sixth U-shaped hairpin 232, facilitating to reduce circulating current loss, and improving motor efficiency.

[0065] For example, as Figure 3As shown, the first stator slot 111 and the second stator slot 112 have six slot layers 30 arranged in the radial direction, the six slot layers 30 of the first stator slot 111 and the second stator slot 112 include a first slot layer 51, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer and a sixth slot layer, the second slot layer of the first stator slot 111 and the second slot layer of the second stator slot 112 are the same slot layer, and the third slot layer of the first stator slot 111 and the third slot layer of the second stator slot 112 are the same slot layer. The first slot layer 51 includes a first sub-slot layer 31 and a second sub-slot layer 32, the first installation layer 301 is the second slot layer of the first stator slot 111, the first installation layer 301 includes a third sub-slot layer 33 and a fourth sub-slot layer 34, the second installation layer 302 is the third slot layer of the second stator slot 112, the second installation layer 302 includes a fifth sub-slot layer 35 and a sixth sub-slot layer 36, the third installation layer 303 is the third slot layer of the first stator slot 111, the third installation layer 303 includes a ninth sub-slot layer 37 and a tenth sub-slot layer 38, the fourth installation layer 304 is the second slot layer of the second stator slot 112, and the fourth installation layer 304 includes an eleventh sub-slot layer 39 and a twelfth sub-slot layer 310.

[0066] The second sub-slot layer 32 of the first stator slot 111 is formed as an A1 position, the first sub-slot layer 31 of the first stator slot 111 is formed as an A2 position, the fourth sub-slot layer 34 is formed as a B1 position, the third sub-slot layer 33 is formed as a B2 position, the tenth sub-slot layer 38 is formed as a B3 position, the ninth sub-slot layer 37 is formed as a B4 position, the first sub-slot layer 31 of the second stator slot 112 is formed as an A1+n position, the second sub-slot layer 32 of the second stator slot 112 is formed as an A2+n position, the eleventh sub-slot layer 39 is formed as a B3+n position, the twelfth sub-slot layer 310 is formed as a B4+n position, the fifth sub-slot layer 35 is formed as a B1+n position, and the sixth sub-slot layer 36 is formed as a B2+n position.

[0067] The stator winding 20 includes a first U-shaped hairpin group 21, a second U-shaped hairpin group 22, a third U-shaped hairpin group 23 and three seventh U-shaped hairpins 25, the first U-shaped hairpin group 21 includes a first U-shaped hairpin 211 and a second U-shaped hairpin 212, the second U-shaped hairpin group 22 includes a third U-shaped hairpin 221 and a fourth U-shaped hairpin 222, the third U-shaped hairpin group 23 includes a fifth U-shaped hairpin 231 and a sixth U-shaped hairpin 232, and the seventh U-shaped hairpin 25 is one. The span of the first U-shaped hairpin 211, the second U-shaped hairpin 212, the third U-shaped hairpin 221, the fourth U-shaped hairpin 222, the fifth U-shaped hairpin 231, the sixth U-shaped hairpin 232 and the seventh U-shaped hairpin 25 is n.

[0068] As Figure 4As shown, one end of the first U-shaped hairpin 211 is located at the A1 position, the other end of the first U-shaped hairpin 211 is located at the A1+n position after transposition, one end of the second U-shaped hairpin 212 is located at the A2 position, the other end of the second U-shaped hairpin 212 is located at the A2+n position, one end of the third U-shaped hairpin 221 is located at the B1 position, the other end of the third U-shaped hairpin 221 is located at the B1+n position, one end of the fourth U-shaped hairpin 222 is located at the B2 position, the other end of the fourth U-shaped hairpin 222 is located at the B2+n position, one end of the sixth U-shaped hairpin 232 is located at the B3 position, the other end of the sixth U-shaped hairpin 232 is located at the B3+n position, one end of the fifth U-shaped hairpin 231 is located at the B4 position, the other end of the fifth U-shaped hairpin 231 is located at the B4+n position, one end of the three seventh U-shaped hairpins 25 is arranged in the fourth slot layer, the fifth slot layer and the sixth slot layer of the first stator slot 111, and the other end of the three seventh U-shaped hairpins 25 is arranged in the fourth slot layer, the fifth slot layer and the sixth slot layer of the second stator slot 112, so as to realize the winding of the stator winding 20 on the stator core 10.

[0069] In some embodiments of the utility model, as shown in the figure, Figure 3 As shown, the second U-shaped hairpin group 22 and the third U-shaped hairpin group 23 are arranged in the radial direction of the stator core 10, and the different winding layouts of the stator winding 20 on the stator core 10 can be realized by the plurality of second U-shaped hairpin groups 22 and the third U-shaped hairpin groups 23.

[0070] In the embodiments of the utility model, the number of the second U-shaped hairpin group 22 and the third U-shaped hairpin group 23 can be flexibly set according to actual conditions, for example, as shown in the figure, Figure 3 The second U-shaped hairpin group 22 and the third U-shaped hairpin group 23 can be two, three, four, five, six or more, which are all within the protection scope of the utility model.

[0071] According to some embodiments of the utility model, as shown in the figure, Figure 4 As shown, each stator slot 11 has M slot layers arranged in the radial direction, the slot layer 30 located at the most inner end in the radial direction in each stator slot 11 is the first slot layer 51, the slot layer 30 located at the most outer end in the radial direction is the Mth slot layer 52, at least one of the first slot layer 51 and the Mth slot layer 52 is provided with the first U-shaped hairpin group 21, that is, the first slot layer 51 is provided with the first U-shaped hairpin group 21, or the Mth slot layer 52 is provided with the first U-shaped hairpin group 21, or the first slot layer 51 and the Mth slot layer 52 are both provided with the first U-shaped hairpin group 21, which can realize the different winding layouts of the stator winding 20 on the stator core 10, can reduce the stator winding 20 loss caused by the skin effect and the eddy current loss, effectively balance the voltage difference, facilitate to reduce the circulating current loss, and can effectively improve the motor efficiency.

[0072] In some embodiments of the utility model, such as Figure 3 With Figures 2-4 As shown in the drawings, because the stator winding 20 conductor close to the slot opening of the stator slot 11 is most seriously affected by the rotor leakage field, the AC loss of the stator winding 20 conductor located at the slot opening will be greater than that of the stator winding 20 conductor away from the slot opening, thus, the first U-shaped hairpin group 21 is arranged in the first slot layer 51, which can realize the transposition of the stator winding 20 in the first slot layer 51, effectively suppress the AC loss of the stator winding 20 conductor close to the slot opening, so that the suppression effect is better, and compared with the constant pitch transposition structure of the litz wire in the related art, the above structure of the utility model can simplify the manufacturing process of the stator winding 20, so that the forming process of the stator winding 20 is simple, which is beneficial to reduce the production cost.

[0073] In addition, as shown in the drawings, Figure 1 With Figure 3 As shown in the drawings, when the first U-shaped hairpin group 21 is arranged in the first slot layer 51, the stator assembly 100 further comprises a seventh U-shaped hairpin 25, one end of the seventh U-shaped hairpin 25 is arranged in the remaining slot layer 30 of the first stator slot 111, and the other end of the seventh U-shaped hairpin 25 is arranged in the remaining slot layer 30 of the second stator slot 112, which can effectively suppress the AC loss of the stator winding 20 conductor, facilitate the winding of the stator winding 20 on the stator core 10, and improve the assembly efficiency. For example, the seventh U-shaped hairpin 25 is a root, so that the structure of the seventh U-shaped hairpin 25 is simple, which can reduce the production cost.

[0074] In some embodiments, the two ends of the seventh U-shaped hairpin 25 are arranged in the same slot layer 30 of the first stator slot 111 and the second stator slot 112, respectively, or the two ends of the seventh U-shaped hairpin 25 are arranged in the adjacent two slot layers 30 of the first stator slot 111 and the second stator slot 112, respectively, which can realize the different winding layout of the stator winding 20 on the stator core 10, so that the winding is more flexible.

[0075] For example, as shown in the drawings, Figure 1As shown, the first stator slot 111 and the second stator slot 112 each have six slot layers 30 arranged in the radial direction of the stator core 10, the six slot layers 30 of the first stator slot 111 and the second stator slot 112 include a first slot layer 51, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer and a sixth slot layer, the first slot layer 51 is located at the radially innermost end, and the first slot layer 51 includes a first sub-slot layer 31 and a second sub-slot layer 32. The first sub-slot layer 31 includes a first slot sub-layer 311 and a second slot sub-layer 312, the second sub-slot layer 32 includes a third slot sub-layer 321 and a fourth slot sub-layer 322, the third slot sub-layer 321 of the first stator slot 111 is formed as an A1 position, the fourth slot sub-layer 322 of the first stator slot 111 is formed as an A2 position, the second slot sub-layer 312 of the first stator slot 111 is formed as an A3 position, the first slot sub-layer 311 of the first stator slot 111 is formed as an A4 position, the first slot sub-layer 311 of the second stator slot 112 is formed as an A1+n position, the second slot sub-layer 312 of the second stator slot 112 is formed as an A2+n position, the fourth slot sub-layer 322 of the second stator slot 112 is formed as an A3+n position, and the third slot sub-layer 321 of the second stator slot 112 is formed as an A4+n position.

[0076] The stator winding 20 includes a first U-shaped hairpin group 21 and five seventh U-shaped hairpins 25, the first U-shaped hairpin group 21 includes a first U-shaped hairpin 211 and a second U-shaped hairpin 212, the first U-shaped hairpin 211 includes a first sub-U-shaped hairpin 41 and a second sub-U-shaped hairpin 42, the second U-shaped hairpin 212 includes a third sub-U-shaped hairpin 43 and a fourth sub-U-shaped hairpin 44, and the seventh U-shaped hairpin 25 is one. The span of the first sub-U-shaped hairpin 41, the second sub-U-shaped hairpin 42, the third sub-U-shaped hairpin 43, the fourth sub-U-shaped hairpin 44 and the seventh U-shaped hairpin 25 is n.

[0077] One end of the first sub-U-shaped hairpin 41 is located at the A1 position, the other end of the first sub-U-shaped hairpin 41 is located at the A1+n position after transposition, one end of the second sub-U-shaped hairpin 42 is located at the A2 position, the other end of the second sub-U-shaped hairpin 42 is located at the A2+n position, one end of the third sub-U-shaped hairpin 43 is located at the A3 position, the other end of the third sub-U-shaped hairpin 43 is located at the A3+n position, one end of the fourth sub-U-shaped hairpin 44 is located at the A4 position, the other end of the fourth sub-U-shaped hairpin 44 is located at the A4+n position, one end of the five seventh U-shaped hairpins 25 is arranged in the second slot layer, the third slot layer, the fourth slot layer, the fifth slot layer and the sixth slot layer of the first stator slot 111, and the other end of the five seventh U-shaped hairpins 25 is arranged in the second slot layer, the third slot layer, the fourth slot layer, the fifth slot layer and the sixth slot layer of the second stator slot 112, thereby realizing winding the stator winding 20 on the stator core 10.

[0078] In some embodiments, the groove layer 30 can have 6 to 10 layers, which simplifies the structure, facilitates manufacturing, and reduces process complexity. For example, in some specific embodiments, the groove layer 30 can have 6, 7, 8, 9, or 10 layers.

[0079] For example, such as Figure 3 As shown, the first stator slot 111 and the second stator slot 112 have six slot layers 30 arranged in the radial direction. The six slot layers 30 of the first stator slot 111 and the second stator slot 112 include a first slot layer 51, a second slot layer, a third slot layer, a fourth slot layer, a fifth slot layer, and a sixth slot layer. The second slot layer of the first stator slot 111 and the second slot layer of the second stator slot 112 are the same slot layer. The third slot layer of the first stator slot 111 and the third slot layer of the second stator slot 112 are the same slot layer. The fourth slot layer of the first stator slot 111 and the fourth slot layer of the second stator slot 112 are the same slot layer 30. The fifth slot layer of the first stator slot 111 and the fifth slot layer of the second stator slot 112 are the same slot layer 30. The sixth slot layer of the first stator slot 111 and the sixth slot layer of the second stator slot 112 are the same slot layer 30.

[0080] The first mounting layer 51 includes a first sub-mounted layer 31 and a second sub-mounted layer 32. Multiple first mounting layers 301 are included, each including a second and fourth mounting layer of the first stator slot 111, a third sub-mounted layer 33, and a fourth sub-mounted layer 34. Multiple second mounting layers 302 are included, each including a third and a fifth mounting layer of the second stator slot 112, a fifth sub-mounted layer 35, and a sixth sub-mounted layer 36. Multiple third mounting layers 303 are included, each including a first stator slot 111... The third slot layer of 1 and the fifth slot layer of the first stator slot 111, the third mounting layer 303 includes the ninth sub-slot layer 37 and the tenth sub-slot layer 38, the fourth mounting layer 304 is multiple, the multiple fourth mounting layers 304 include the second slot layer of the second stator slot 112 and the fourth slot layer of the second stator slot 112, the fourth mounting layer 304 includes the eleventh sub-slot layer 39 and the twelfth sub-slot layer 310, the sixth slot layer 30 of the first stator slot 111 includes the seventh sub-slot layer 521 and the eighth sub-slot layer 522, the sixth slot layer 30 of the second stator slot 112 includes the seventh sub-slot layer 521 and the eighth sub-slot layer 522, the sixth slot layer 30 is the Mth slot layer 52.

[0081] The second sub-slot layer 32 of the first stator slot 111 is formed as an A1 position, the first sub-slot layer 31 of the first stator slot 111 is formed as an A2 position, the fourth sub-slot layer 34 of the second slot layer of the first stator slot 111 is formed as a B1 position, the third sub-slot layer 33 of the second slot layer of the first stator slot 111 is formed as a B2 position, the tenth sub-slot layer 38 of the third slot layer of the first stator slot 111 is formed as a B3 position, the ninth sub-slot layer 37 of the third slot layer of the first stator slot 111 is formed as a B4 position, the fourth sub-slot layer 34 of the fourth slot layer of the first stator slot 111 is formed as a C1 position, the third sub-slot layer 33 of the fourth slot layer of the first stator slot 111 is formed as a C2 position, the tenth sub-slot layer 38 of the fifth slot layer of the first stator slot 111 is formed as a C3 position, the ninth sub-slot layer 37 of the fifth slot layer of the first stator slot 111 is formed as a C4 position, the seventh sub-slot layer 521 of the first stator slot 111 is formed as a D2 position, and the eighth sub-slot layer 522 of the second stator slot 112 is formed as a D1 position.

[0082] The first sub-slot layer 31 of the second stator slot 112 is formed as an A1+n position, the second sub-slot layer 32 of the second stator slot 112 is formed as an A2+n position, the eleventh sub-slot layer 39 of the second slot layer of the second stator slot 112 is formed as a B3+n position, the twelfth sub-slot layer 310 of the second slot layer of the second stator slot 112 is formed as a B4+n position, the fifth sub-slot layer 35 of the third slot layer of the second stator slot 112 is formed as a B1+n position, the sixth sub-slot layer 36 of the third slot layer of the second stator slot 112 is formed as a B2+n position, the eleventh sub-slot layer 39 of the fourth slot layer of the second stator slot 112 is formed as a C3+n position, the twelfth sub-slot layer 310 of the fourth slot layer of the second stator slot 112 is formed as a C4+n position, the fifth sub-slot layer 35 of the fifth slot layer of the second stator slot 112 is formed as a C1+n position, the sixth sub-slot layer 36 of the fifth slot layer of the second stator slot 112 is formed as a C2+n position, the seventh sub-slot layer 521 of the second stator slot 112 is formed as a D1+n position, and the eighth sub-slot layer 522 of the second stator slot 112 is formed as a D2+n position.

[0083] The stator winding 20 includes two first U-shaped hairpin groups 21, two second U-shaped hairpin groups 22, and two third U-shaped hairpin groups. The first U-shaped hairpin group 21 includes a first U-shaped hairpin 211 and a second U-shaped hairpin 212, the second U-shaped hairpin group 22 includes a third U-shaped hairpin 221 and a fourth U-shaped hairpin 222, and the third U-shaped hairpin group 23 includes a fifth U-shaped hairpin 231 and a sixth U-shaped hairpin 232. The span of the first U-shaped hairpin 211, the second U-shaped hairpin 212, the third U-shaped hairpin 221, the fourth U-shaped hairpin 222, the fifth U-shaped hairpin 231, and the sixth U-shaped hairpin 232 is n.

[0084] As Figure 1 Figure 4 Figure 4As shown, one end of one of the first U-shaped hairpins 211 is located at the A1 position and the other end is located at the A1+n position after transposition, one end of one of the second U-shaped hairpins 212 is located at the A2 position and the other end is located at the A2+n position, one end of one of the third U-shaped hairpins 221 is located at the B1 position and the other end is located at the B1+n position, one end of one of the fourth U-shaped hairpins 222 is located at the B2 position and the other end is located at the B2+n position, one end of one of the sixth U-shaped hairpins 232 is located at the B3 position and the other end is located at the B3+n position, one end of one of the fifth U-shaped hairpins 231 is located at the B4 position and the other end is located at the B4+n position, one end of another of the third U-shaped hairpins 221 is located at the C1 position and the other end is located at the C1+n position, one end of another of the fourth U-shaped hairpins 222 is located at the C2 position and the other end is located at the C2+n position, one end of another of the sixth U-shaped hairpins 232 is located at the C3 position and the other end is located at the C3+n position, one end of another of the fifth U-shaped hairpins 231 is located at the C4 position and the other end is located at the C4+n position, one end of another of the first U-shaped hairpins 211 is located at the D1 position and the other end is located at the D1+n position, one end of another of the second U-shaped hairpins 212 is located at the D2 position and the other end is located at the D2+n position, thereby achieving the winding of the stator winding 20 on the stator core 10.

[0085] In some embodiments, the outer circumferential wall of the first U-shaped hairpin group 21 is provided with a second insulation layer, which can achieve the required insulation requirement and avoid short circuit, leakage and other problems, effectively improving the safety and reliability of the motor.

[0086] In some embodiments, the outer circumferential wall of at least one of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is provided with a third insulation layer, that is, the outer circumferential wall of the first U-shaped hairpin 211 is provided with a third insulation layer, or the outer circumferential wall of the second U-shaped hairpin 212 is provided with a third insulation layer, or the outer circumferential wall of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is provided with a third insulation layer, which can achieve the required insulation requirement and avoid short circuit, leakage and other problems, effectively improving the safety and reliability of the motor.

[0087] In some embodiments, the outer circumferential wall of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is provided with a third insulation layer, and the outer circumferential wall of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 after being attached is also provided with a second insulation layer, which can further ensure the insulation effect and make the insulation reliable.

[0088] In some embodiments, the first, second, third and fourth U-shaped hairpins 41, 42, 43 and 44 are provided with first insulation layers on the outer peripheral walls, and the outer peripheral walls of the first, second, third and fourth U-shaped hairpins 41, 42, 43 and 44 after being attached are further provided with second insulation layers, which can further ensure the insulation effect and make the insulation reliable.

[0089] The motor according to the embodiment of the utility model comprises the stator assembly 100 according to the embodiment of the utility model. Since the stator assembly 100 according to the embodiment of the utility model has the beneficial technical effects described above, the motor according to the embodiment of the utility model, by the first U-shaped hairpin 211 and the second U-shaped hairpin 212 being arranged in at least one slot layer 30 of the first stator slot 111 and one end of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 being arranged in the same slot layer 30 of the second stator slot 112, the first U-shaped hairpin 211 is located on the radial outer side of the second U-shaped hairpin 212 in the first stator slot 111, and the first U-shaped hairpin 211 is located on the radial inner side of the second U-shaped hairpin 212 in the second stator slot 112, the cross-sectional area of a single stator winding 20 conductor can be reduced, the stator winding 20 loss caused by skin effect and eddy current loss can be reduced, transposition of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 can be realized, the voltage difference between the first U-shaped hairpin 211 and the second U-shaped hairpin 212 can be effectively balanced, the circulating current loss can be reduced, and the motor efficiency can be effectively improved.

[0090] In some embodiments, the motor comprises a rotor arranged in the stator assembly 100, and three-phase alternating current is supplied to the stator winding 20, so that the stator assembly 100 forms a rotating magnetic field, and the rotor provided with a magnetic steel can rotate synchronously under the action of the rotating magnetic field, thereby meeting the working requirements of the motor.

[0091] The vehicle according to the embodiment of the utility model discloses a motor according to the embodiment of the utility model. Because the motor according to the embodiment of the utility model has the beneficial technical effect described above, the vehicle according to the embodiment of the utility model, by the first U-shaped hairpin 211 and the second U-shaped hairpin 212 are arranged in the at least one slot layer 30 of the first stator slot 111, the other end of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is arranged in the same slot layer 30 of the second stator slot 112, in the first stator slot 111, the first U-shaped hairpin 211 is located at the radial outer side of the second U-shaped hairpin 212, in the second stator slot 112, the first U-shaped hairpin 211 is located at the radial inner side of the second U-shaped hairpin 212, the cross-sectional area of a single stator winding 20 conductor can be reduced, thereby the stator winding 20 loss caused by skin effect and eddy current loss can be reduced, and transposition of the first U-shaped hairpin 211 and the second U-shaped hairpin 212 can be realized, the voltage difference between the first U-shaped hairpin 211 and the second U-shaped hairpin 212 is effectively balanced, the circulating loss is facilitated to be reduced, and the motor efficiency can be effectively improved.

[0092] The vehicle can be a new energy electric vehicle.

[0093] The stator assembly 100, the motor and the vehicle according to the embodiment of the utility model and other configurations and operations are known to those skilled in the art, and will not be described in detail here.

[0094] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0095] In the description of the specification, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0096] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A stator assembly characterized by, The application relates to a stator core, a stator winding and a motor. The stator core has a plurality of stator slots arranged at intervals along a circumferential direction of the stator core, and the plurality of stator slots include a first stator slot and a second stator slot, and each of the first stator slot and the second stator slot has a plurality of slot layers arranged in a radial direction of the stator core. The stator winding includes a first U-shaped hairpin group, the first U-shaped hairpin group includes a first U-shaped hairpin and a second U-shaped hairpin, one end of the first U-shaped hairpin and the second U-shaped hairpin is arranged in at least one slot layer of the first stator slot, and the other end of the first U-shaped hairpin and the second U-shaped hairpin is arranged in the same slot layer of the second stator slot. In the first stator slot, the first U-shaped hairpin is located on a radial outer side of the second U-shaped hairpin; and in the second stator slot, the first U-shaped hairpin is located on a radial inner side of the second U-shaped hairpin.

2. The stator assembly of claim 1, wherein, The first U-shaped hairpin includes a first sub-U-shaped hairpin and a second sub-U-shaped hairpin, the second U-shaped hairpin includes a third sub-U-shaped hairpin and a fourth sub-U-shaped hairpin, one end of the first sub-U-shaped hairpin, the second sub-U-shaped hairpin, the third sub-U-shaped hairpin and the fourth sub-U-shaped hairpin is arranged in at least one slot layer of the first stator slot, and the other end of the first sub-U-shaped hairpin, the second sub-U-shaped hairpin, the third sub-U-shaped hairpin and the fourth sub-U-shaped hairpin is arranged in the same slot layer of the second stator slot, and one end of the first sub-U-shaped hairpin in the first stator slot and one end of the first sub-U-shaped hairpin in the second stator slot are located on the same side of the second sub-U-shaped hairpin, and one end of the fourth sub-U-shaped hairpin in the first stator slot and one end of the fourth sub-U-shaped hairpin in the second stator slot are located on the same side of the third sub-U-shaped hairpin. In the first stator slot, the first sub-U-shaped hairpin and the fourth sub-U-shaped hairpin are opposite in the radial direction; and in the second stator slot, the first sub-U-shaped hairpin and the fourth sub-U-shaped hairpin are opposite in the radial direction.

3. The stator assembly of claim 2, wherein, An outer peripheral wall of at least one of the first sub-U-shaped hairpin, the second sub-U-shaped hairpin, the third sub-U-shaped hairpin and the fourth sub-U-shaped hairpin is provided with a first insulation layer.

4. The stator assembly of claim 1, wherein, The stator winding further includes a second U-shaped hairpin group, and two ends of the second U-shaped hairpin group are arranged in adjacent two slot layers of the first stator slot and the second stator slot respectively.

5. The stator assembly of claim 4, wherein, One of the adjacent two slot layers of the first stator slot and the second stator slot is a first installation layer, and the other is a second installation layer, the second U-shaped hairpin group includes a third U-shaped hairpin and a fourth U-shaped hairpin, one end of the third U-shaped hairpin and the fourth U-shaped hairpin is arranged in the first installation layer, and the other end is arranged in the second installation layer. In the first installation layer, the third U-shaped hairpin is located on a radial outer side of the fourth U-shaped hairpin; and in the second installation layer, the third U-shaped hairpin is located on a radial inner side of the fourth U-shaped hairpin.

6. The stator assembly of claim 4, wherein, The stator winding further comprises a third U-shaped hairpin group, both ends of the third U-shaped hairpin group are arranged in two adjacent slot layers of the first stator slot and the second stator slot respectively, Wherein, in the first stator slot, the second U-shaped hairpin group is located at the radial inner side of the third U-shaped hairpin group; in the second stator slot, the second U-shaped hairpin group is located at the radial outer side of the third U-shaped hairpin group.

7. The stator assembly of claim 6, wherein, The second U-shaped hairpin group and the third U-shaped hairpin group are a plurality of groups arranged along the radial direction of the stator core.

8. The stator assembly of any one of claims 1-7, wherein, Each of the stator slots has M slot layers arranged in the radial direction, the slot layer located at the most radial inner end in each of the stator slots is a first slot layer, and the slot layer located at the most radial outer end is an Mth slot layer, at least one of the first slot layer and the Mth slot layer is provided with the first U-shaped hairpin group.

9. The stator assembly of claim 8, wherein, When the first U-shaped hairpin group is arranged in the first slot layer, the stator assembly further comprises: A seventh U-shaped hairpin, one end of the seventh U-shaped hairpin is arranged in the remaining slot layers of the first stator slot, and the other end of the seventh U-shaped hairpin is arranged in the remaining slot layers of the second stator slot.

10. The stator assembly of claim 1, wherein, The outer peripheral wall of the first U-shaped hairpin group is provided with a second insulation layer; And / or, the outer peripheral wall of at least one of the first U-shaped hairpin and the second U-shaped hairpin is provided with a third insulation layer.

11. An electric machine characterized by The stator assembly according to any one of claims 1-10.

12. A vehicle characterized by comprising: The motor according to claim 11.

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