Three-phase stator winding, motor stator assembly and motor

Abstract

The present invention belongs to the field of motors, and discloses a three-phase stator winding, a motor stator assembly and a motor. Among them, the three-phase stator winding includes N layers of hairpin windings stacked in sequence. Among them, the hairpin coils in the first layer of hairpin winding and the Nth layer of hairpin winding are cross-connected in the same layer, and the pitch of each hairpin coil in the first layer of hairpin winding is a first short pitch, and the pitch of each hairpin coil in the Nth layer of hairpin winding is a full pitch; the hairpin coils in the second layer of hairpin winding to the (N-1)th layer of hairpin winding are cross-connected between different layers; in the same-phase stator winding, the ends of adjacent hairpin coils are directly welded; N≥4. The present invention achieves the purpose of optimizing the end welding process of the stator winding and the end height after welding through short pitch arrangement.

Description

Technical Field

[0001] The present invention belongs to the field of motors, and in particular, relates to a three-phase stator winding, a motor stator assembly and a motor. Background Art

[0002] With the development of new energy vehicles, the requirements for automotive permanent magnet synchronous motors are getting higher and higher. While meeting the power performance, they also pursue riding comfort. However, the noise generated by the motor when it is working has always been a problem that troubles engineers. In order to minimize the noise generated by electromagnetic excitation, the back electromotive force of the motor is required to have good sinusoidal properties. Therefore, when designing the arrangement structure of the motor winding, electromagnetic engineers often use short-distance arrangement to reduce the 5th and 7th harmonics in the back electromotive force.

[0003] like Figure 4 and Figure 6 As shown, due to the high proportion of the 5th and 7th harmonics, the sinusoidal nature of the waveform of the line back electromotive force of the three-phase stator winding arranged at full pitch is poor, resulting in higher electromagnetic noise.

[0004] like Figure 1 As shown, there is a motor stator winding, which optimizes the outer end of the winding arrangement by making the hairpin coil into short span and full span, but its winding method is only suitable for full span winding arrangement. If a short span winding arrangement is adopted, its winding method cannot complete the direct welding connection of all adjacent (Note: it refers to the adjacent in the winding path or electrically adjacent, not the adjacent in spatial position) outer ends of the winding, and it is necessary to use more same-layer bridge wires for connection. Figure 1 Taking the B-phase winding as an example, the 8-slot 1-layer hairpin coil is connected to the 14-slot 1-layer hairpin coil through the same-layer bridge wire, the 13-slot 4-layer hairpin coil is connected to the 20-slot 4-layer hairpin coil through the same-layer bridge wire, and the 14-slot 4-layer hairpin coil is connected to the 19-slot 4-layer hairpin coil through the same-layer bridge wire. The number of special-shaped hairpin coils will also increase, which will not only bring great challenges to the welding process, but also because the bridge wires are superimposed and arranged at the end to be welded, the end height after welding is inevitably increased, reducing the torque density of the motor. Summary of the invention

[0005] The object of the present invention is to provide a three-phase stator winding, in which some specific layers adopt a short-pitch arrangement structure to optimize the outer end of the winding, simplify the end welding process, and reduce the end height after welding.

[0006] To achieve the above object, in a first aspect, the present invention provides a three-phase stator winding, including N layers of hairpin windings stacked in sequence. Among them, the hairpin coils in the first layer of hairpin winding and the Nth layer of hairpin winding are cross-connected in the same layer, and the pitch of each hairpin coil in the first layer of hairpin winding is a first short pitch, and the pitch of each hairpin coil in the Nth layer of hairpin winding is a full pitch; the hairpin coils in the second layer of hairpin winding to the (N - 1)th layer of hairpin winding are cross-connected between different layers; in the same-phase stator winding, the ends of adjacent hairpin coils are directly welded; N ≥ 4.

[0007] Further, the cross-connection between different layers is a cross-connection between adjacent layers; the pitch of each hairpin coil in the second layer of hairpin winding to the (N - 1)th layer of hairpin winding is a first long pitch, or, the hairpin coils in the second layer of hairpin winding to the (N - 1)th layer of hairpin winding are arranged at equal intervals with a full pitch and a second short pitch, and the first short pitch > the second short pitch.

[0008] Further, in the same-phase stator winding, the hairpin coils with cross-connection in the same layer and the hairpin coils with cross-connection between different layers are arranged at intervals.

[0009] Further, the number of stator slots is 48, the number of motor poles is 8, and N = 4; the first short pitch is 5; preferably, the first long pitch is 7.

[0010] Further, the number of stator slots is 48, the number of motor poles is 8, and N = 4; the second short pitch is 4, half of the hairpin coils in the second layer of hairpin winding and the third layer of hairpin winding have a full pitch, and the other half of the hairpin coils have a second short pitch, and every two hairpin coils with a full pitch and every two hairpin coils with a second short pitch are arranged at intervals.

[0011] Further, each phase of the stator winding includes 32 hairpin coils. Among them, the starting hairpin coil crosses from the second layer to the third layer with a pitch of 7, the second hairpin coil cross-connects in the same layer from the fourth layer with a pitch of 6, the third hairpin coil crosses from the third layer to the second layer with a pitch of 7, the fourth hairpin coil cross-connects in the same layer from the first layer with a pitch of 5, the fifth hairpin coil crosses from the second layer to the third layer with a pitch of 7, and so on until the last hairpin coil.

[0012] Further, each phase of the stator winding includes 32 hairpin coils. Among them, the starting hairpin coil crosses the same layer from the first layer with a span of 5. The second hairpin coil crosses from the second layer to the third layer with a span of 6. The third hairpin coil crosses the same layer from the fourth layer with a span of 6. The fourth hairpin coil crosses from the third layer to the second layer with a span of 6. The fifth hairpin coil crosses the same layer from the first layer with a span of 5. The sixth hairpin coil crosses from the second layer to the third layer with a span of 4. The seventh hairpin coil crosses the same layer from the fourth layer with a span of 6. The eighth hairpin coil crosses from the third layer to the second layer with a span of 4. The ninth hairpin coil crosses the same layer from the first layer with a span of 5, and so on until the last hairpin coil.

[0013] In a second aspect, the present invention provides a motor stator assembly, including the three-phase stator winding described in the technical solution of the first aspect, and the three-phase stator winding is sequentially stacked in N layers in the stator slots; N≥4.

[0014] In a third aspect, the present invention provides a motor, including the motor stator assembly described in the technical solution of the second aspect.

[0015] Through the above technical solutions, on the one hand, the ends of adjacent hairpin coils are very close to each other, and the two ends can be directly welded together to complete the connection, and the welding process is very simple and time-saving, only spot welding is required; on the other hand, the crossover wires are completely eliminated, so that there will be no redundant wires stacked on the ends of the hairpin coils, which can effectively reduce the end height after welding; in addition, it can also effectively eliminate odd-order high-order harmonics, thereby effectively reducing electromagnetic noise.

[0016] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0017] Figure 1 is a schematic diagram of the arrangement structure of a stator winding in the prior art;

[0018] Figure 2 is a schematic diagram of the arrangement structure of an embodiment of the three-phase stator winding of the present invention;

[0019] Figure 3 is a schematic diagram of the arrangement structure of another embodiment of the three-phase stator winding of the present invention;

[0020] Figure 4 is a line back electromotive force waveform diagram of a stator winding in the prior art;

[0021] Figure 5 is a line back electromotive force waveform diagram of an embodiment of the three-phase stator winding of the present invention;

[0022] Figure 6It is a comparison diagram of the line back electromotive force harmonic waveforms of an embodiment of the three-phase stator winding in the prior art with different span arrangement structures and in the present invention. Detailed Embodiment

[0023] The following further elaborates on the detailed embodiment of the present invention in conjunction with the accompanying drawings. It should be understood that the detailed embodiment described herein is only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.

[0024] First of all, it should be noted that in the description of the following technical solutions of the present invention, the orientation terms such as "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0025] As Figure 1 shown, the middle row of numbers represents the numbers of the stator slots. The four wires from left to right in each slot respectively correspond to the first, second, third, and fourth layers. The first layer is the layer closest to the motor rotor, that is, the innermost layer relative to the axis of the motor. In the prior art, for a three-phase permanent magnet synchronous motor with 48 stator slots and 8 motor poles, the winding paths of the three-phase stator windings are as follows (taking phase B as an example, phases A and C are similar):

[0026] Slot 9, layer 1 → Slot 2, layer 2 → Slot 45, layer 1 → Slot 38, layer 2 → Slot 33, layer 1 → Slot 26, layer 2 → Slot 21, layer 1 → Slot 14, layer 2 → Slot 9, layer 3 → Slot 2, layer 4 → Slot 45, layer 3 → Slot 38, layer 4 → Slot 33, layer 3 → Slot 26, layer 4 → Slot 21, layer 3 → Slot 14, layer 4 → Slot 19, layer 4 → Slot 26, layer 3 → Slot 31, layer 4 → Slot 38, layer 3 → Slot 43, layer 4 → Slot 2, layer 3 → Slot 7, layer 4 → Slot 14, layer 3 → Slot 19, layer 2 → Slot 26, layer 1 → Slot 31, layer 2 → Slot 38, layer 1 → Slot 43, layer 2 → Slot 2, layer 1 → Slot 7, layer 2 → Slot 14, layer 1 → Slot 8, layer 1 → Slot 1, layer 2 → Slot 44, layer 1 → Slot 37, layer 2 → Slot 32, layer 1 → Slot 25, layer 2 → Slot 20, layer 1 → Slot 13, layer 2 → Slot 8, layer 3 → Slot 1, layer 4 → Slot 44, layer 3 → Slot 37, layer 4 → Slot 32, layer 3 → Slot 25, layer 4 → Slot 20, layer 3 → Slot 13, layer 4 → Slot 20, layer 4 → Slot 27, layer 3 → Slot 32, layer 4 → Slot 39, layer 3 → Slot 44, layer 4 → Slot 3, layer 3 → Slot 8, layer 4 → Slot 15, layer 3 → Slot 20, layer 2 → Slot 27, layer 1 → Slot 32, layer 2 → Slot 39, layer 1 → Slot 44, layer 2 → Slot 3, layer 1 → Slot 8, layer 2 → Slot 15, layer 1.

[0027] It can be seen that all the hairpin coils in the first-layer to the fourth-layer hairpin windings adopt cross-wiring between different layers, and the span of each hairpin coil is a long span of 7. There are multiple jumper wires for electrical connection within the same layer in each phase winding, resulting in a complex end welding process. The superposition of the jumper wires at the end significantly increases the height of the end after welding, complex winding, and low production efficiency.

[0028] An embodiment of the three-phase stator winding of the present invention is used in a three-phase permanent magnet synchronous motor with 48 stator slots and 8 motor pole pairs. At this time, the pole pitch of the motor is 6. A hairpin coil with a pitch or span equal to 6 is a full pitch, greater than 6 is a long pitch, and less than 6 is a short pitch. Each phase stator winding includes 32 hairpin coils, and the stacking layer number N = 4. Among them, the starting hairpin coil crosses from the second layer to the third layer with a span of 7, the second hairpin coil crosses within the same layer from the fourth layer with a span of 6, the third hairpin coil crosses from the third layer to the second layer with a span of 7, the fourth hairpin coil crosses within the same layer from the first layer with a span of 5, the fifth hairpin coil crosses from the second layer to the third layer with a span of 7, and so on until the last hairpin coil.

[0029] Specifically, as Figure 2 shown, the middle row of numbers represents the numbers of the stator slots. The four wires from left to right in each slot respectively correspond to the first, second, third, and fourth layers. The first layer is the layer closest to the motor rotor, that is, the innermost layer relative to the axis of the motor. Figure 2 In

[0030] the B-phase winding starts from the power supply terminal B1, and the winding path is as follows:

[0031] 2 slot, layer 2 → 9 slot, layer 3 → 14 slot, layer 4 → 20 slot, layer 4 → 15 slot, layer 3 → 8 slot, layer 2 → 3 slot, layer 1 → 8 slot, layer 1 → 13 slot, layer 2 → 20 slot, layer 3 → 25 slot, layer 4 → 31 slot, layer 4 → 26 slot, layer 3 → 19 slot, layer 2 → 14 slot, layer 1 → 9 slot, layer 1 → 14 slot, layer 2 → 21 slot, layer 3 → 26 slot, layer 4 → 32 slot, layer 4 → 27 slot, layer 3 → 20 slot, layer 2 → 15 slot, layer 1 → 20 slot, layer 1 → 25 slot, layer 2 → 32 slot, layer 3 → 37 slot, layer 4 → 43 slot, layer 4 → 38 slot, layer 3 → 31 slot, layer 2 → 26 slot, layer 1 → 21 slot, layer 1 → 26 slot, layer 2 → 33 slot, layer 3 → 38 slot, layer 4 → 44 slot, layer 4 → 39 slot, layer 3 → 32 slot, layer 2 → 27 slot, layer 1 → 32 slot, layer 1 → 37 slot, layer 2 → 44 slot, layer 3 → 1 slot, layer 4 → 7 slot, layer 4 → 2 slot, layer 3 → 43 slot, layer 2 → 38 slot, layer 1 → 33 slot, layer 1 → 38 slot, layer 2 → 45 slot, layer 3 → 2 slot, layer 4 → 8 slot, layer 4 → 3 slot, layer 3 → 44 slot, layer 2 → 39 slot, layer 1 → 44 slot, layer 1 → 1 slot, layer 2 → 8 slot, layer 3 → 13 slot, layer 4 → 19 slot, layer 4 → 14 slot, layer 3 → 7 slot, layer 2 → 2 slot, layer 1 → 45 slot, layer 1.

[0031] It can be seen that in the winding scheme of the B-phase winding in this embodiment, the 16 hairpin coils in the first-layer hairpin winding and the fourth-layer hairpin winding are all cross-wired in the same layer, and the span of the 8 hairpin coils in the first-layer hairpin winding is all short pitch 5, and the span of the 8 hairpin coils in the fourth-layer hairpin winding is all full pitch 6; the 16 hairpin coils in the second-layer hairpin winding and the third-layer hairpin winding are all cross-wired between different layers, and the span of the 16 hairpin coils in these two layers is all long pitch 7.

[0032] In this embodiment, the stator windings of the same phase at least have the following winding rules: 1. Starting from a hairpin coil with cross-wiring between different layers, the hairpin coils with cross-wiring between different layers and the hairpin coils with cross-wiring in the same layer are arranged at intervals, that is, the adjacent hairpin coils of a hairpin coil with cross-wiring between different layers must be hairpin coils with cross-wiring in the same layer; 2. The layers where the adjacent hairpin coils are located change continuously and reciprocally, and this layer is repeated once at the first layer and the fourth layer respectively to achieve cross-wiring in the same layer, that is, starting from the second layer, the cross-wiring is carried out according to the change rule of 2→3→4→4→3→2→1→1→2→3→4→4→3→2→1…; 3. Among two adjacent or electrically adjacent hairpin coils on the winding path, according to the winding order or arrangement order, there is only a tiny gap between the second end of the front hairpin coil and the first end of the rear hairpin coil. These rules will surely make the winding more convenient and fast, the connection between adjacent hairpin coils simpler, only spot welding is needed, the connection process is greatly simplified, and the production efficiency can be greatly improved. Due to the strong regularity of the winding, winding errors can be effectively prevented.

[0033] Compare Figure 2 with Figure 1 It can be seen that in the stator windings of the same phase, on the one hand, the ends of adjacent hairpin coils are very close to each other, and the two ends can be directly welded together to complete the connection, and this welding process is very simple and time-saving, only spot welding is needed; on the other hand, the Figure 1 shown in has been completely eliminated, so that there will be no redundant wires stacked on the ends of the hairpin coils, and the end height after welding can be effectively reduced.

[0034] Figure 2 In, the A-phase winding starts from the power supply terminal A1, and the C-phase winding starts from the power supply terminal C1. Its winding path also has the winding rules of the B-phase winding, and thus has the same technical effects as the above-mentioned B-phase winding. Therefore, when manufacturing the three-phase stator windings of this embodiment, the end welding process can be simplified, and the end height after welding can be effectively reduced.

[0035] As Figure 6 shown, the amplitudes of the 5th and 7th harmonics of the line back electromotive force of the three-phase stator windings in this embodiment are greatly reduced, and the amplitudes of the 17th and 19th harmonics are also significantly reduced (not shown in the figure). Compare Figure 5 with Figure 4By comparison, it can be seen that the line back electromotive force waveform of the three-phase stator winding in this embodiment has better sinusoidality, and thus can effectively suppress electromagnetic noise.

[0036] In another embodiment of the three-phase stator winding of the present invention, only the span of each hairpin coil in the second-layer hairpin winding and the third-layer hairpin winding in the previous embodiment is adjusted, from a single-span long pitch of 7 to a composite span of full pitch of 6 and short pitch of 4, that is, the span of a part of the hairpin coils in the second-layer hairpin winding and the third-layer hairpin winding is full pitch of 6, and the span of the other part of the hairpin coils is short pitch of 4. Specifically, as Figure 3 shown, only the winding path of the B-phase winding is shown. Starting from the power supply terminal B1, the winding path is as follows:

[0037] Slot 3, Layer 1 → Slot 8, Layer 1 → Slot 14, Layer 2 → Slot 20, Layer 3 → Slot 26, Layer 4 → Slot 32, Layer 4 → Slot 26, Layer 3 → Slot 20, Layer 2 → Slot 14, Layer 1 → Slot 9, Layer 1 → Slot 15, Layer 2 → Slot 19, Layer 3 → Slot 25, Layer 4 → Slot 31, Layer 4 → Slot 25, Layer 3 → Slot 21, Layer 2 → Slot 15, Layer 1 → Slot 20, Layer 1 → Slot 26, Layer 2 → Slot 32, Layer 3 → Slot 38, Layer 4 → Slot 44, Layer 4 → Slot 38, Layer 3 → Slot 32, Layer 2 → Slot 26, Layer 1 → Slot 21, Layer 1 → Slot 27, Layer 2 → Slot 31, Layer 3 → Slot 37, Layer 4 → Slot 43, Layer 4 → Slot 37, Layer 3 → Slot 33, Layer 2 → Slot 27, Layer 1 → Slot 32, Layer 1 → Slot 38, Layer 2 → Slot 44, Layer 3 → Slot 2, Layer 4 → Slot 8, Layer 4 → Slot 2, Layer 3 → Slot 44, Layer 2 → Slot 38, Layer 1 → Slot 33, Layer 1 → Slot 39, Layer 2 → Slot 43, Layer 3 → Slot 1, Layer 4 → Slot 7, Layer 4 → Slot 1, Layer 3 → Slot 45, Layer 2 → Slot 39, Layer 1 → Slot 44, Layer 1 → Slot 2, Layer 2 → Slot 8, Layer 3 → Slot 14, Layer 4 → Slot 20, Layer 4 → Slot 14, Layer 3 → Slot 8, Layer 2 → Slot 2, Layer 1 → Slot 45, Layer 1 → Slot 3, Layer 2 → Slot 7, Layer 3 → Slot 13, Layer 4 → Slot 19, Layer 4 → Slot 13, Layer 3 → Slot 9, Layer 2.

[0038] It can be seen that in the winding scheme of the B-phase winding in this embodiment, the hairpin coils in the first-layer hairpin winding and the fourth-layer hairpin winding are cross-wired in the same layer, and the span of 8 hairpin coils in the first-layer hairpin winding is short pitch of 5, and the span of 8 hairpin coils in the fourth-layer hairpin winding is full pitch of 6; the hairpin coils in the second-layer hairpin winding and the third-layer hairpin winding are cross-wired between different layers, among which the span of 8 hairpin coils is full pitch of 6, and the span of 8 hairpin coils is short pitch of 4.

[0039] In this embodiment, the stator windings of the same phase at least have the following winding rules: 1. Starting with a hairpin coil with a same-layer crossover, the hairpin coils with different-layer crossovers are arranged at intervals with the hairpin coils with same-layer crossovers, that is, the adjacent hairpin coils of a hairpin coil with a different-layer crossover must be hairpin coils with same-layer crossovers; 2. The layers where the adjacent hairpin coils are located change continuously and reciprocally, and this layer is repeated once at the first layer and the fourth layer respectively to achieve same-layer crossover, that is, starting from the first layer, the crossover is carried out according to the change rule of 1→1→2→3→4→4→3→2→1→1→2→3→4→4→3→2→1…; 3. Among the hairpin coils with different-layer crossovers, according to two different pitches, full pitch and the second short pitch are arranged at equal intervals. This equality refers to the number of continuously arranged hairpin coils with the same pitch, that is, the hairpin coils with full pitch 6 and the hairpin coils with short pitch 4 are arranged at intervals of every two; 4. Between two adjacent or electrically adjacent hairpin coils on the winding path, according to the winding order or arrangement order, there is only a tiny gap between the second end of the front hairpin coil and the first end of the rear hairpin coil. These rules will necessarily make the winding more convenient and fast, the connection between adjacent hairpin coils more simple, and only spot welding is required, greatly simplifying the connection process and significantly improving the production efficiency. Due to the strong regularity of the winding, winding errors can also be effectively prevented.

[0040] Comparing Figure 3 with Figure 1 it can be seen that in the stator windings of the same phase, on the one hand, the ends of adjacent hairpin coils are very close to each other, and the two ends can be directly welded together to complete the connection, and this welding process is very simple and time-saving, only spot welding is required; on the other hand, the Figure 1 shown in the crossover wire has been completely eliminated, so that there will be no redundant wires stacked on the ends of the hairpin coils, and the end height after welding can be effectively reduced. Similarly, in this embodiment, the winding paths of the A-phase winding and the C-phase winding also have the winding rules of the B-phase winding, and thus have the same technical effects as the B-phase winding. Therefore, when manufacturing the three-phase stator windings of this embodiment, the end welding process can also be simplified, and the end height after welding can be effectively reduced.

[0041] An embodiment of the motor stator assembly of the present invention is used for a three-phase permanent magnet synchronous motor with 48 stator slots and 8 motor poles, and includes the three-phase stator windings described in any one of the above embodiments of the three-phase stator windings. The three-phase stator windings are stacked in four layers in 48 stator slots in sequence, and at least have all the beneficial effects brought by the technical solutions of any one of the above embodiments of the three-phase stator windings.

[0042] An embodiment of the motor of the present invention, the motor is a three-phase permanent magnet synchronous motor with 8 poles and 48 stator slots, and includes the motor stator assembly described in the above embodiment of the motor stator assembly, and at least has all the beneficial effects brought by the technical solutions of any one of the above embodiments of the three-phase stator windings.

[0043] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including the combination of each specific technical feature in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. However, these simple modifications and combinations should also be regarded as the content disclosed by the present invention and all fall within the protection scope of the present invention.

Claims

1. A three-phase stator winding, characterized in that, It includes N layers of hairpin windings stacked in sequence. Among them, the hairpin coils in the first layer of hairpin winding and the Nth layer of hairpin winding are cross-connected within the same layer, and the pitch of each hairpin coil in the first layer of hairpin winding is the first short pitch, and the pitch of each hairpin coil in the Nth layer of hairpin winding is the full pitch; the hairpin coils in the second layer of hairpin winding to the (N - 1)th layer of hairpin winding are cross-connected between different layers; in the same-phase stator winding, the ends of adjacent hairpin coils are directly welded; N≥4; The cross-connection between different layers is cross-connection between adjacent layers; the pitch of each hairpin coil in the second layer of hairpin winding to the (N - 1)th layer of hairpin winding is the first long pitch, or, the hairpin coils in the second layer of hairpin winding to the (N - 1)th layer of hairpin winding are arranged at equal intervals with the full pitch and the second short pitch, and the first short pitch > the second short pitch. In the same-phase stator winding, the hairpin coils with cross-connection within the same layer and the hairpin coils with cross-connection between different layers are arranged at intervals; The winding rules of the winding paths of each phase stator winding are the same.

2. The three-phase stator winding according to claim 1, wherein The number of stator slots is 48, the number of motor poles is 8, and N = 4; the first short pitch is 5.

3. The three-phase stator winding according to claim 2, wherein, The first long pitch is 7.

4. The three-phase stator winding according to claim 1, wherein The number of stator slots is 48, the number of motor poles is 8, and N = 4; the second short pitch is 4. In the second layer of hairpin winding and the third layer of hairpin winding, half of the hairpin coils have a full pitch, and the other half of the hairpin coils have a second short pitch, and every two hairpin coils with a full pitch and every two hairpin coils with a second short pitch are arranged at intervals.

5. The three-phase stator winding according to claim 2 or 3, characterized in that, Each phase stator winding includes 32 hairpin coils. Among them, the starting hairpin coil crosses from the second layer to the third layer with a pitch of 7, the second hairpin coil cross-connects within the same layer from the fourth layer with a pitch of 6, the third hairpin coil crosses from the third layer to the second layer with a pitch of 7, the fourth hairpin coil cross-connects within the same layer from the first layer with a pitch of 5, the fifth hairpin coil crosses from the second layer to the third layer with a pitch of 7, and so on until the last hairpin coil.

6. The three-phase stator winding according to claim 4, wherein Each phase stator winding includes 32 hairpin coils. Among them, the starting hairpin coil cross-connects within the same layer from the first layer with a pitch of 5, the second hairpin coil crosses from the second layer to the third layer with a pitch of 6, the third hairpin coil cross-connects within the same layer from the fourth layer with a pitch of 6, the fourth hairpin coil crosses from the third layer to the second layer with a pitch of 6, the fifth hairpin coil cross-connects within the same layer from the first layer with a pitch of 5, the sixth hairpin coil crosses from the second layer to the third layer with a pitch of 4, the seventh hairpin coil cross-connects within the same layer from the fourth layer with a pitch of 6, the eighth hairpin coil crosses from the third layer to the second layer with a pitch of 4, the ninth hairpin coil cross-connects within the same layer from the first layer with a pitch of 5, and so on until the last hairpin coil.

7. A motor stator assembly, characterized in that, It includes the three-phase stator winding according to any one of claims 1 - 6, and this three-phase stator winding is stacked in N layers in the stator slots in sequence; N≥4.

8. A motor, characterized in that, It includes the motor stator assembly according to claim 7.

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