Flat wire stator assembly and drive motor

Abstract

The application provides a flat wire stator assembly and a driving motor, the flat wire stator assembly is applied to an M-phase motor with a rotor pole number of 2p; the flat wire stator assembly comprises a stator core and an M-phase stator winding, the stator core has a stator slot, and the M-phase stator winding is wound into six layers in the stator slot; each phase of the M-phase stator winding comprises a set of sub-windings, and a is not a divisor of 2p; each set of the sub-windings comprises coils distributed in a first layer and a second layer, a third layer and a fourth layer and a fifth layer and a sixth layer of the stator slot, and the number of the coils distributed in the first layer and the second layer, the number of the coils distributed in the third layer and the fourth layer and the number of the coils distributed in the fifth layer and the sixth layer of each set of the sub-windings are all greater than or equal to 2. The embodiment of the application optimizes the connection mode, so that the inductance asymmetry between each set of the sub-windings is small, thereby reducing winding circulating current and reducing additional copper loss.

Description

Technical Field

[0001] The present invention relates to the field of motors, and more specifically, to a flat wire stator assembly and a drive motor. Background Technology

[0002] Environmental pollution and the energy crisis have spurred the booming development of the new energy vehicle industry, especially the electric vehicle sector. As a key component of electric vehicles, the performance of the vehicle's drive motor is crucial to the overall vehicle performance. Currently, automotive motors are developing towards higher speeds, lighter weights, and higher efficiency, placing higher demands on their power density, efficiency levels, and heat dissipation capabilities.

[0003] Compared to round wire motors, flat wire motors have higher slot fill factor, shorter winding ends, higher power density, and stronger heat dissipation capabilities, making them particularly suitable for applications requiring miniaturization and weight reduction in automotive drive motors.

[0004] Flat wire motors inherently exhibit the skin effect, especially high-speed motors, where the skin effect is more pronounced. Therefore, to mitigate the skin effect, flat wire motors typically increase the number of conductor layers in the stator slots to reduce the thickness of the flat wire. As the number of flat wire layers increases, the winding connection methods also increase. Inappropriate connection methods can lead to winding inductance imbalance, resulting in winding circulating current and increasing additional copper losses in the windings.

[0005] like Figure 1 , 2 The diagram shows the topology of a three-phase stator winding (e.g., U-phase, V-phase, and W-phase stator windings) in an existing flat-wire motor, as well as the winding structure of the three sets of sub-windings (including the first set of windings U1, the second set of windings U2, and the third set of windings U3) in each phase of the stator winding on the stator core. Due to limitations in the connection method, the third set of sub-windings U3 in each phase of the existing flat-wire motor does not have coils connected in series to the third and fourth layers of the stator slots, resulting in a significant asymmetry in the inductance among the three sets of sub-windings. Figure 3 As shown, this results in the generation of larger winding circulating currents, which in turn increases additional copper losses.

[0006] In addition, the third set of sub-windings U3, which is distributed in the first and second layers of the stator slots, and the coils distributed in the fifth and sixth layers, need to be connected across layers, which requires the addition of bridging copper busbars. This greatly increases the material cost and the difficulty of assembly. Summary of the Invention

[0007] This invention addresses the problems of significant inductance asymmetry, increased copper losses, high material costs, and difficult assembly in existing flat wire motors by providing a flat wire stator assembly and a drive motor.

[0008] The technical solution of this invention to solve the above-mentioned technical problem is to provide a flat wire stator assembly applied to an M-phase motor with a rotor pole number of 2p. The flat wire stator assembly includes a stator core and an M-phase stator winding. The inner circumference of the stator core has N axially arranged stator slots, and the M-phase stator winding is wound into six layers in the stator slots. N, p, and M are all positive integers. Each phase stator winding of the M-phase stator winding includes a sets of parallel connected sub-windings, where a is a positive integer and not a divisor of 2p. Each set of sub-windings includes coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slots. The number of coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of each set of sub-windings is greater than or equal to 2.

[0009] Preferably, each phase of the M-phase stator winding includes three sets of sub-windings, and each set of sub-windings includes n coils connected in series, where n equals N / 3;

[0010] The number of coils distributed in the first and second layers of the stator slot, the number of coils distributed in the third and fourth layers, and the number of coils distributed in the fifth and sixth layers of each set of sub-windings are all even numbers greater than or equal to 4.

[0011] Preferably, the coils in each set of the sub-windings are respectively arranged along the winding direction of the sub-windings, and the lead-out end of the coil and the lead-in end of the connected coil are located in the same layer or adjacent layer of the stator slot; the coil is a U-shaped hairpin copper busbar or an I-shaped copper busbar.

[0012] Preferably, the three sets of sub-windings of each phase stator winding include a first sub-winding, a second sub-winding, and a third sub-winding, respectively;

[0013] The first sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and 3n / 8 coils distributed in the fifth and sixth layers of the stator slots;

[0014] The second sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and 3n / 8 coils distributed in the fifth and sixth layers of the stator slots;

[0015] The third sub-winding includes n / 4 coils distributed in the first and second layers of the stator slots, n / 2 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots.

[0016] Preferably, the three sets of sub-windings of each phase stator winding include a first sub-winding, a second sub-winding, and a third sub-winding, respectively;

[0017] The first sub-winding includes n / 4 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and 3n / 8 coils distributed in the fifth and sixth layers of the stator slots;

[0018] The second sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots;

[0019] The third sub-winding includes n / 2 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots.

[0020] Preferably, the three sets of sub-windings of each phase stator winding include a first sub-winding, a second sub-winding, and a third sub-winding, respectively;

[0021] The first sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots;

[0022] The second sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots;

[0023] The third sub-winding includes n / 4 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and n / 2 coils distributed in the fifth and sixth layers of the stator slots.

[0024] Preferably, M is 3, p is 4, and N is 48;

[0025] The first sub-winding includes a first coil group located in the first and second layers of the stator slot, a second coil group located in the third and fourth layers of the stator slot, and a third coil group located in the fifth and sixth layers of the stator slot;

[0026] The second sub-winding includes a fourth coil group located in the first and second layers of the stator slot, a fifth coil group located in the third and fourth layers of the stator slot, and a sixth coil group located in the fifth and sixth layers of the stator slot, wherein the fourth coil group, the fifth coil group, and the sixth coil group are wound in opposite directions to the first sub-winding.

[0027] The third sub-winding includes a seventh coil group located in the first and second layers of the stator slot, an eighth coil group located in the first and second layers of the stator slot, a ninth coil group located in the third and fourth layers of the stator slot, a tenth coil group located in the third and fourth layers of the stator slot, an eleventh coil group located in the fifth and sixth layers of the stator slot, and a twelfth coil group located in the fifth and sixth layers of the stator slot. The seventh, ninth, and eleventh coil groups are wound in the same direction as the first sub-winding, while the eighth, tenth, and twelfth coil groups are wound in the opposite direction to the first sub-winding.

[0028] Preferably, the eighth, seventh, ninth, eleventh, twelfth, and tenth coil groups of the third sub-winding are connected in series, and the phase voltage lead of the third sub-winding is conductively connected to the eighth coil group located in the second layer of the stator slot, and the neutral lead is conductively connected to the ninth coil group located in the third layer of the stator slot.

[0029] The phase voltage lead of the first sub-winding and the neutral lead of the second sub-winding are respectively connected to the coil in the first layer of the stator slot, and the neutral lead of the first sub-winding and the phase voltage lead of the second sub-winding are respectively connected to the coil in the sixth layer of the stator slot.

[0030] Preferably, the first coil group and the third coil group each include six equidistant coils, and the six equidistant coils of the first coil group and the third coil group are connected in series; the second coil group includes four equidistant coils, and the four equidistant coils of the second coil group are connected in series; the first coil group, the second coil group and the third coil group are connected in series in sequence through two short-pitch coils.

[0031] The fourth and sixth coil groups each include six equidistant coils, and the six equidistant coils of the fourth and sixth coil groups are connected in series; the fifth coil group includes four equidistant coils, and the four equidistant coils of the fifth coil group are connected in series; the fourth, fifth, and sixth coil groups are connected in series sequentially through two short-pitch coils.

[0032] The seventh, eighth, eleventh, and twelfth coil groups each include two equidistant coils, and the ninth and fourth coil groups each include four equidistant coils. The eighth, seventh, ninth, eleventh, twelfth, and tenth coil groups are connected in series sequentially through five short-pitch coils.

[0033] This invention also provides a drive motor, including a rotor assembly and a flat wire stator assembly as described in any of the preceding embodiments.

[0034] The flat wire stator assembly and drive motor of the present invention have the following beneficial effects: By connecting the coils of each set of sub-windings in series to the first and second, third and fourth, and fifth and sixth layers of the stator slots, and setting the number of coils in the first and second layers of the stator slots, the number of coils in the third and fourth layers, and the number of coils in the fifth and sixth layers of each set of sub-windings to be greater than or equal to 2, the connection method can be effectively optimized, making the inductance asymmetry between the sets of sub-windings of each phase stator winding smaller, thereby reducing the winding circulating current and reducing additional copper loss; and since each set of sub-windings includes coils distributed in the first and second layers of the stator slots, the third and fourth layers, and the fifth and sixth layers, the coils of the same set of windings do not need to be connected across layers, which can not only reduce material costs, but also effectively reduce the difficulty of assembly operations, thereby improving assembly efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the topology of the three-phase stator winding in the flat wire stator assembly of an existing flat wire motor;

[0036] Figure 2 This is a schematic diagram of the winding structure of three sets of sub-windings on the stator core in each phase stator winding of an existing flat wire motor.

[0037] Figure 3 It is a waveform diagram of the current in the three sets of sub-windings in each phase stator winding of an existing flat wire motor;

[0038] Figure 4 This is a schematic diagram of the topology of the three-phase stator winding in the flat wire stator assembly provided in this embodiment of the invention;

[0039] Figure 5 This is a schematic diagram of the cross-section of the coil in the flat wire stator assembly provided in an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the winding structure of three sets of sub-windings in each phase stator winding of the flat wire stator assembly provided in this embodiment of the invention on the stator core;

[0041] Figure 7 This is a waveform diagram of the current in the three sets of sub-windings in the three-phase stator winding of the flat wire stator assembly provided in the embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the winding structure of three sets of sub-windings in each phase stator winding of the flat wire stator assembly provided in another embodiment of the present invention on the stator core;

[0043] Figure 9 This is a schematic diagram of the drive motor provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0045] like Figure 4 The diagram shown is a topological structure diagram of the three-phase stator winding in the flat wire stator assembly provided in an embodiment of the present invention. This flat wire stator assembly can be applied in the field of motor equipment, especially in the drive motor of new energy vehicles.

[0046] Combination Figure 5 As shown, the flat wire stator assembly in this embodiment is mainly used in three-phase motors with a rotor pole number of 2p (p is a positive integer). Specifically, the flat wire stator assembly includes a stator core and three-phase stator windings (e.g., U-phase stator winding, V-phase stator winding, and W-phase stator winding), wherein the inner circumference of the stator core has N (N is a positive integer) axially arranged stator slots 7. The aforementioned three-phase stator windings can be composed of flat wires (the flat wires can specifically include conductors with a rectangular cross-section and an insulating layer wrapped around the conductors), and the three-phase stator windings are wound into six layers in the stator slots 7, specifically including a first layer L1, a second layer L2, a third layer L3, a fourth layer L4, a fifth layer L5, and a sixth layer L6 arranged sequentially from the outside to the inside along the radial direction of the motor.

[0047] Preferably, each phase of the three-phase stator winding includes a (a is a positive integer) sets of parallel-connected sub-windings, and a is not a divisor of 2p. That is, the number of parallel branches of each phase stator winding is not a divisor of the number of rotor poles of the motor. This can effectively improve the matching between the low-speed torque and high-speed power of the motor, so as to be suitable for high-speed applications without increasing the inverter capacity, thereby reducing costs.

[0048] Specifically, each set of sub-windings for each phase stator winding includes coils distributed in the first layer L1 and the second layer L2 of stator slot 7, distributed in the third layer L3 and the fourth layer L4, and distributed in the fifth layer L5 and the sixth layer L6. The number of coils distributed in the first layer L1 and the second layer L2 of stator slot 7, the number of coils distributed in the third layer L3 and the fourth layer L4, and the number of coils distributed in the fifth layer L5 and the sixth layer L6 of each set of sub-windings are all greater than or equal to 2. This arrangement greatly improves the balance of coil distribution, which not only facilitates the winding and assembly of the three-phase stator windings, but also reduces the parallel branch resistance, inductance imbalance rate and current imbalance rate of the stator windings in each direction, and has high practicality.

[0049] The aforementioned flat wire stator assembly connects the coils of each set of sub-windings of each phase stator winding in series with the first layer L1, the second layer L2, the third layer L3, the fourth layer L4, the fifth layer L5, and the sixth layer L6 of stator slot 7. Simultaneously, the number of coils in the first layer L1 and the second layer L2, the third layer L3 and the fourth layer L4, and the fifth layer L5 and the sixth layer L6 of each set of sub-windings is set to be greater than or equal to 2. This effectively optimizes the connection method of the three-phase stator windings, ensuring that the three-phase stator windings have coils wound in each layer of stator slot 7, thus improving the rationality of the connection method. This reduces the asymmetry of inductance among the three sets of sub-windings of each phase stator winding (i.e., making the back EMF, resistance, and inductance of each parallel sub-winding approximately the same), thereby reducing the additional copper losses caused by circulating currents between parallel sub-windings, improving motor efficiency, and reducing the temperature rise of the stator windings. When applied in electric vehicles, it can effectively improve NVH performance and enhance the market competitiveness of electric vehicles.

[0050] Since each set of sub-windings includes coils distributed in the first layer L1 and the second layer L2 in stator slot 7, the third layer L3 and the fourth layer L4, and the fifth layer L5 and the sixth layer L6, the coils of the same set of sub-windings do not need to be connected across layers. During assembly, there is no need to use long-distance bridging copper busbars to achieve series connection, which not only controls material costs but also effectively reduces the difficulty of assembly operations, thereby improving the assembly efficiency of the above-mentioned flat wire stator assembly.

[0051] Specifically, the coils in each sub-winding are arranged along the winding direction of the sub-winding, and the lead-out end of each coil and the lead-in end of the connected coil are located in the same or adjacent layer of stator slot 7. That is, the lead-out end of each coil can be directly connected in series with the lead-in end of the connected coil. This eliminates the need for short-pitch coil connections, improving the convenience of series assembly and saving materials to reduce costs. Of course, two adjacent coils can be connected in series using short-pitch coils, depending on the actual situation.

[0052] In practical applications, the coils of the three-phase stator windings can specifically be U-shaped hairpin copper busbars, with one leg forming the input end and the other leg forming the output end. During assembly, the two legs of the U-shaped hairpin copper busbar are directly inserted into two adjacent layers of the stator slot 7, namely, layer L1 and layer L2, layer L3 and layer L4, or layer L5 and layer L6, to complete the coil assembly. Assembly is convenient and quick, facilitating disassembly and maintenance. Of course, the coils of the above-mentioned three-phase stator windings can also use type I (double-end soldering) or continuous wave winding (no soldering), depending on the actual situation.

[0053] In an embodiment of the present invention, each phase of the three-phase stator winding comprises three sets of sub-windings, and each set of sub-windings comprises n coils connected in series. Specifically, n equals N / 3, and n is a positive integer.

[0054] Preferably, the number of coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, the number of coils distributed in the third layer L3 and the fourth layer L4, and the number of coils distributed in the fifth layer L5 and the sixth layer L6 of each sub-winding are all even numbers greater than or equal to 4. This makes the number of coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, the number of coils distributed in the third layer L3 and the fourth layer L4, and the number of coils distributed in the fifth layer L5 and the sixth layer L6 of each sub-winding more uniform, and makes the distribution ratio of coils in each layer more reasonable. This can further optimize the connection method of the three-phase stator winding, improve the symmetry of the inductance between the three sub-windings of each phase stator winding, and suppress the circulating current between parallel sub-windings.

[0055] Example 1

[0056] Each phase stator winding has three sets of sub-windings, including a first sub-winding, a second sub-winding, and a third sub-winding, and the three-phase stator windings are wound in the following manner:

[0057] Each phase stator winding's first sub-winding includes 3n / 8 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, n / 4 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and 3n / 8 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0058] The second sub-winding of each phase stator winding includes 3n / 8 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, n / 4 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and 3n / 8 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0059] The third sub-winding of each phase stator winding includes n / 4 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, n / 2 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and n / 4 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0060] Example 2

[0061] Each phase stator winding has three sets of sub-windings, including a first sub-winding, a second sub-winding, and a third sub-winding, and the three-phase stator windings are wound in the following manner:

[0062] Each phase stator winding's first sub-winding includes n / 4 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, 3n / 8 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and 3n / 8 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0063] The second sub-winding of each phase stator winding includes 3n / 8 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, 3n / 8 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and n / 4 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0064] The third sub-winding of each phase stator winding includes n / 2 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, n / 4 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and n / 4 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0065] Example 3

[0066] Each phase stator winding has three sets of sub-windings, including a first sub-winding, a second sub-winding, and a third sub-winding, and the three-phase stator windings are wound in the following manner:

[0067] Each phase stator winding's first sub-winding includes 3n / 8 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, 3n / 8 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and n / 4 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0068] The second sub-winding of each phase stator winding includes 3n / 8 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, 3n / 8 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and n / 4 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0069] The third sub-winding of each phase stator winding includes n / 4 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, n / 4 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and n / 2 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0070] In the first embodiment of the present invention, the above-mentioned flat wire stator assembly is applied to a three-phase motor with a rotor pole number of 8, i.e., p = 4. Furthermore, the inner circumference of the stator core has 48 axially arranged stator slots 7, and the three-phase stator winding is wound in 6 layers within these 48 stator slots 7.

[0071] like Figure 6 The diagram shows the detailed wiring diagram of each sleeve winding in the U-phase winding of the flat wire stator assembly. The reference numerals 1, 2, 3...47, 48 represent the numbers of the 48 stator slots 7 (i.e., slots 1, 2, 3...47, 48). The inverted V mark on each layer represents the coil. The end connected to the inverted V dotted line represents the current layer, and the end connected to the inverted V solid line represents the adjacent layer. Here, the adjacent layers are the first layer L1 and the second layer L2, the third layer L3 and the fourth layer L4, and the fifth layer L5 and the sixth layer L6. That is, the adjacent layer of the first layer L1 is the second layer L2, the adjacent layer of the second layer L2 is the first layer L1, the adjacent layer of the third layer L3 is the fourth layer L4, the adjacent layer of the fourth layer L4 is the third layer L3, the adjacent layer of the fifth layer L5 is the sixth layer L6, and the adjacent layer of the sixth layer L6 is the fifth layer L5.

[0072] Specifically, the first sub-winding U1 includes a first coil group U11 located in the first layer L1 and the second layer L2 of the stator slot 7, a second coil group U13 located in the third layer L3 and the fourth layer L4 of the stator slot 7, and a third coil group U15 located in the fifth layer L5 and the sixth layer L6 of the stator slot 7. Preferably, the first coil group U11, the second coil group U13, and the third coil group U15 are located in the same slot.

[0073] The first coil group U11 and the third coil group U15 each include six equidistant coils, and the second coil group U13 includes four equidistant coils. The first coil group U11, the second coil group U13 and the third coil group U15 are connected in series in sequence through two short-pitch coils.

[0074] Specifically, the first coil group U11 includes coils 111, 112, 113, 114, 115, and 116 (i.e., the six equidistant coils) connected in series; the second coil group U13 includes coils 131, 132, 133, and 134 (i.e., the four equidistant coils) connected in series; and the third coil group U15 includes coils 151, 152, 153, 154, 155, and 156 (i.e., the six equidistant coils) connected in series.

[0075] During assembly, insert coil 111 into slot 1 of the first layer L1 and slot 7 of the second layer L2; insert coil 112 into slot 13 of the first layer L1 and slot 19 of the second layer L2; insert coil 113 into slot 25 of the first layer L1 and slot 31 of the second layer L2; insert coil 114 into slot 38 of the first layer L1 and slot 44 of the second layer L2; insert coil 115 into slot 2 of the first layer L1 and slot 8 of the second layer L2; and insert coil 116 into slot 14 of the first layer L1 and slot 20 of the second layer L2. Then, insert coil 131 into slot 26 of the third layer L3 and slot 32 of the fourth layer L4, insert coil 132 into slot 38 of the third layer L3 and slot 44 of the fourth layer L4, insert coil 133 into slot 1 of the third layer L3 and slot 7 of the fourth layer L4, and insert coil 134 into slot 13 of the third layer L3 and slot 19 of the fourth layer L4. Next, insert coil 151 into slot 25 of layer L5 and slot 31 of layer L6, insert coil 152 into slot 37 of layer L5 and slot 43 of layer L6, insert coil 153 into slot 1 of layer L5 and slot 7 of layer L6, insert coil 154 into slot 14 of layer L5 and slot 20 of layer L6, insert coil 155 into slot 26 of layer L5 and slot 32 of layer L6, and insert coil 156 into slot 38 of layer L5 and slot 44 of layer L6. Finally, coils 111, 112, 113, 114, 115, 116, 131, 132, 133, 134, 151, 152, 153, 154, 155, and 156 are connected in series (either directly or through short-pitch coils) to complete the winding operation of the first sub-winding U1.

[0076] Furthermore, the phase voltage lead U1+ of the first sub-winding U1 is connected to the lead-in end of the first layer L1 of the stator slot 7 of coil 111, and the neutral lead U1- is connected to the lead-out end of the sixth layer L6 of the stator slot 7 of coil 156. In addition, coil 116 of the first coil group U11 is connected in series with coil 131 of the second coil group U13 via a short-pitch coil 413, and coil 134 of the second coil group U13 is connected in series with coil 151 of the third coil group U15 via a short-pitch coil 435. Of course, in practical applications, adjacent coils can also be connected by direct welding.

[0077] Similarly, the second sub-winding U2 includes a fourth coil group U22 located in the first layer L1 and the second layer L2 of the stator slot 7, a fifth coil group U24 located in the third layer L3 and the fourth layer L4 of the stator slot 7, and a sixth coil group U26 located in the fifth layer L5 and the sixth layer L6 of the stator slot 7. The winding directions of the fourth coil group U22, the fifth coil group U24, and the sixth coil group U26 are opposite to those of the first sub-winding U1. Furthermore, in practical applications, it is preferable that some coils of the fourth coil group U22, the fifth coil group U24, and the sixth coil group U26 are located in the same slot, while others are located in adjacent slots.

[0078] The fourth coil group U22 and the sixth coil group U26 mentioned above each include six equidistant coils, and the fifth coil group U24 includes four equidistant coils. The fourth coil group U22, the fifth coil group U24 and the sixth coil group U26 are connected in series in sequence through two short-pitch coils.

[0079] Specifically, the fourth coil group U22 includes coils 221, 222, 223, 224, 225, and 226 (i.e., the six equidistant coils) connected in series; the fifth coil group U24 includes coils 241, 242, 243, and 244 (i.e., the four equidistant coils) connected in series; and the sixth coil group U26 includes coils 261, 262, 263, 264, 265, and 266 (i.e., the six equidistant coils) connected in series.

[0080] During assembly, insert coil 261 into slot 1 of layer 6 (L6) and slot 43 of layer 5 (L5); insert coil 262 into slot 37 of layer 6 (L6) and slot 31 of layer 5 (L5); insert coil 263 into slot 25 of layer 6 (L6) and slot 19 of layer 5 (L5); insert coil 264 into slot 14 of layer 6 (L6) and slot 8 of layer 5 (L5); insert coil 265 into slot 2 of layer 6 (L6) and slot 44 of layer 5 (L5); and insert coil 266 into slot 38 of layer 6 (L6) and slot 32 of layer 5 (L5). Then, insert coil 241 into slot 26 of the fourth layer L4 and slot 20 of the third layer L3, insert coil 242 into slot 14 of the fourth layer L4 and slot 8 of the third layer L3, insert coil 243 into slot 1 of the fourth layer L4 and slot 43 of the third layer L3, and insert coil 244 into slot 37 of the fourth layer L4 and slot 31 of the third layer L3. Next, insert coil 221 into slot 25 of the second layer L2 and slot 19 of the first layer L1; insert coil 222 into slot 13 of the second layer L2 and slot 7 of the first layer L1; insert coil 223 into slot 1 of the second layer L2 and slot 43 of the first layer L1; insert coil 224 into slot 38 of the second layer L2 and slot 32 of the first layer L1; insert coil 225 into slot 26 of the second layer L2 and slot 20 of the first layer L1; and insert coil 226 into slot 14 of the second layer L2 and slot 8 of the first layer L1. Finally, coils 261, 262, 263, 264, 265, 266, 241, 242, 243, 244, 221, 222, 223, 224, 225, and 226 are connected in series (either directly or through short-pitch coils) to complete the winding operation of the second sub-winding U2.

[0081] Furthermore, the phase voltage lead U2+ of the second sub-winding U2 is connected to the lead-in end of the sixth layer L6 of the stator slot 7 of coil 261, and the neutral lead U2- is connected to the lead-out end of the first layer L1 of the stator slot 7 of coil 226. In addition, coil 266 of the sixth coil group U26 is connected in series with coil 241 of the fifth coil group U24 via a short-pitch coil 564, and coil 244 of the fifth coil group U24 is connected in series with coil 221 of the fourth coil group U22 via a short-pitch coil 542. Of course, in practical applications, adjacent coils can also be connected by direct welding.

[0082] Furthermore, the third sub-winding U3 includes a seventh coil group U31 located in the first layer L1 and the second layer L2 of the stator slot 7, an eighth coil group U32 located in the first layer L1 and the second layer L2 of the stator slot 7, a ninth coil group U33 located in the third layer L3 and the fourth layer L4 of the stator slot 7, a tenth coil group U34 located in the third layer L3 and the fourth layer L4 of the stator slot 7, an eleventh coil group U35 located in the fifth layer L5 and the sixth layer L6 of the stator slot 7, and a twelfth coil group U36 located in the fifth layer L5 and the sixth layer L6 of the stator slot 7. The winding directions of the seventh coil group U31, the ninth coil group U33 and the eleventh coil group U35 are the same as the winding direction of the first sub-winding U1, while the winding directions of the eighth coil group U32, the tenth coil group U34 and the twelfth coil group U36 are opposite to the winding direction of the first sub-winding U1.

[0083] The seventh coil group U31, the eighth coil group U32, the eleventh coil group U35 and the twelfth coil group U36 each include two equidistant coils, and the ninth coil group U33 and the fourth coil group U34 each include four equidistant coils. Furthermore, the eighth coil group U32, the seventh coil group U31, the ninth coil group U33, the eleventh coil group U35, the twelfth coil group U36 and the tenth coil group U34 are connected in series in sequence through five short-pitch coils.

[0084] Specifically, the seventh coil group U31 includes coils 311 and 312 connected in series (i.e., the two equidistant coils); the eighth coil group U32 includes coils 321 and 322 connected in series (i.e., the two equidistant coils); the ninth coil group U33 includes coils 331, 332, 333, and 334 connected in series (i.e., the four equidistant coils); the tenth coil group U34 includes coils 341, 342, 343, and 344 connected in series (i.e., the four equidistant coils); the eleventh coil group U35 includes coils 351 and 352 connected in series (i.e., the two equidistant coils); and the twelfth coil group U36 includes coils 361 and 362 connected in series (i.e., the two equidistant coils).

[0085] During assembly, insert coil 321 into slot 2 of the second layer L2 and slot 44 of the first layer L1; insert coil 322 into slot 37 of the second layer L2 and slot 31 of the first layer L1. Then insert coil 311 into slot 26 of the first layer L1 and slot 32 of the second layer L2; insert coil 312 into slot 37 of the first layer L1 and slot 43 of the second layer L2. Next, insert coil 331 into slot 2 of the third layer L3 and slot 8 of the fourth layer L4; insert coil 332 into slot 14 of the third layer L3 and slot 20 of the fourth layer L4; insert coil 333 into slot 25 of the third layer L3 and slot 31 of the fourth layer L4; and insert coil 334 into slot 37 of the third layer L3 and slot 43 of the fourth layer L4. Next, insert coil 351 into slot 2 of layer L5 and slot 8 of layer L6, and insert coil 352 into slot 13 of layer L5 and slot 19 of layer L6. Then, insert coil 361 into slot 26 of layer L6 and slot 20 of layer L5, and insert coil 362 into slot 13 of layer L6 and slot 7 of layer L5. Next, insert coil 341 into slot 2 of layer L4 and slot 44 of layer L3, insert coil 342 into slot 38 of layer L4 and slot 32 of layer L3, insert coil 343 into slot 25 of layer L4 and slot 19 of layer L3, and insert coil 344 into slot 13 of layer L4 and slot 7 of layer L3. Finally, coils 321, 322, 311, 312, 331, 332, 333, 334, 351, 352, 361, 362, 341, 342, 343, and 344 are sequentially electrically connected (either directly or through short-pitch coils) and connected in series. This means that the eighth coil group U32, the seventh coil group U31, the ninth coil group U33, the eleventh coil group U35, the twelfth coil group U36, and the tenth coil group U34 are sequentially connected in series to complete the winding operation of the third sub-winding U3.

[0086] Furthermore, the phase voltage lead U3+ of the third sub-winding U3 is conductively connected to the inlet end of the second layer L2 of the stator slot 7 of the coil 321, and the neutral lead U3- is conductively connected to the outlet end of the third layer L3 of the stator slot 7 of the coil 344.

[0087] Furthermore, coil 322 of the eighth coil group U32 is connected in series with coil 311 of the seventh coil group U31 via short-pitch coil 621; coil 312 of the seventh coil group U31 is connected in series with coil 331 of the ninth coil group U33 via short-pitch coil 613; coil 334 of the ninth coil group U33 is connected in series with coil 351 of the eleventh coil group U35 via short-pitch coil 635; coil 352 of the eleventh coil group U35 is connected in series with coil 361 of the twelfth coil group U36 via short-pitch coil 656; and coil 362 of the twelfth coil group U36 is connected in series with coil 341 of the tenth coil group U34 via short-pitch coil 664. Of course, in practical applications, adjacent coils can also be connected by direct welding.

[0088] The aforementioned flat wire stator assembly, by setting the ninth coil group U33 and the tenth coil group U34 in the third layer L3 and the fourth layer L4 of the third sub-winding U3, can make the inductance between the sub-windings of each phase stator winding have higher symmetry.

[0089] Combination Figure 7 As shown, compared to the existing winding connection method of flat wire motors (such as...), Figure 2 , 3 As shown, the currents of each parallel sub-winding of each phase stator winding of the above-mentioned flat wire stator assembly are basically the same, which greatly suppresses the circulating current generated between the parallel sub-windings, thereby significantly reducing the additional AC copper loss at high frequency, improving the motor efficiency during high-speed operation, avoiding local overheating of the windings, and improving the service life of the motor.

[0090] Combination Figure 8 As shown, in another embodiment of the present invention, the first sub-winding U1 is wound and assembled in the following manner: first, coil 111 is inserted into slot 1 of the first layer L1 and slot 7 of the second layer L2; coil 112 is inserted into slot 14 of the first layer L1 and slot 20 of the second layer L2; coil 113 is inserted into slot 25 of the first layer L1 and slot 31 of the second layer L2; coil 114 is inserted into slot 38 of the first layer L1 and slot 44 of the second layer L2; coil 115 is inserted into slot 2 of the first layer L1 and slot 8 of the second layer L2; and coil 116 is inserted into slot 13 of the first layer L1 and slot 19 of the second layer L2.

[0091] Then, insert coil 131 into slot 25 of the third layer L3 and slot 31 of the fourth layer L4, insert coil 132 into slot 38 of the third layer L3 and slot 44 of the fourth layer L4, insert coil 133 into slot 1 of the third layer L3 and slot 7 of the fourth layer L4, and insert coil 134 into slot 14 of the third layer L3 and slot 20 of the fourth layer L4. Next, insert coil 151 into slot 26 of layer L5 and slot 32 of layer L6, insert coil 152 into slot 37 of layer L5 and slot 43 of layer L6, insert coil 153 into slot 2 of layer L5 and slot 8 of layer L6, insert coil 154 into slot 13 of layer L5 and slot 19 of layer L6, insert coil 155 into slot 25 of layer L5 and slot 31 of layer L6, and insert coil 156 into slot 38 of layer L5 and slot 44 of layer L6.

[0092] Finally, coils 111, 112, 113, 114, 115, 116, 131, 132, 133, 134, 151, 152, 153, 154, 155, and 156 are connected in series (either directly or through short-pitch coils) to complete the winding operation of the first sub-winding U1.

[0093] The second sub-winding U2 is assembled using the following winding configuration: first, insert coil 261 into slot 1 of the sixth layer L6 and slot 43 of the fifth layer L5; insert coil 262 into slot 38 of the sixth layer L6 and slot 32 of the fifth layer L5; insert coil 263 into slot 25 of the sixth layer L6 and slot 19 of the fifth layer L5; insert coil 264 into slot 14 of the sixth layer L6 and slot 8 of the fifth layer L5; insert coil 265 into slot 2 of the sixth layer L6 and slot 44 of the fifth layer L5; and insert coil 266 into slot 37 of the sixth layer L6 and slot 31 of the fifth layer L5.

[0094] Then, insert coil 241 into slot 25 of the fourth layer L4 and slot 19 of the third layer L3, insert coil 242 into slot 14 of the fourth layer L4 and slot 8 of the third layer L3, insert coil 243 into slot 1 of the fourth layer L4 and slot 43 of the third layer L3, and insert coil 244 into slot 38 of the fourth layer L4 and slot 32 of the third layer L3.

[0095] Next, insert coil 221 into slot 26 of the second layer L2 and slot 20 of the first layer L1; insert coil 222 into slot 13 of the second layer L2 and slot 7 of the first layer L1; insert coil 223 into slot 2 of the second layer L2 and slot 44 of the first layer L1; insert coil 224 into slot 37 of the second layer L2 and slot 31 of the first layer L1; insert coil 225 into slot 25 of the second layer L2 and slot 19 of the first layer L1; and insert coil 226 into slot 14 of the second layer L2 and slot 8 of the first layer L1.

[0096] Finally, coils 261, 262, 263, 264, 265, 266, 241, 242, 243, 244, 221, 222, 223, 224, 225, and 226 are connected in series (either directly or through short-pitch coils) to complete the winding operation of the second sub-winding U2.

[0097] The third sub-winding U3 is assembled using the following winding configuration: First, coil 321 is inserted into slot 1 of the second layer L2 and slot 43 of the first layer L1; coil 322 is inserted into slot 38 of the second layer L2 and slot 32 of the first layer L1. Next, coil 311 is inserted into slot 26 of the first layer L1 and slot 32 of the second layer L2; coil 312 is inserted into slot 37 of the first layer L1 and slot 43 of the second layer L2. Then, coil 331 is inserted into slot 2 of the third layer L3 and slot 8 of the fourth layer L4; coil 332 is inserted into slot 13 of the third layer L3 and slot 19 of the fourth layer L4; coil 333 is inserted into slot 26 of the third layer L3 and slot 32 of the fourth layer L4; and coil 334 is inserted into slot 37 of the third layer L3 and slot 43 of the fourth layer L4. Next, insert coil 351 into slot 1 of layer 5 (L5) and slot 7 of layer 6 (L6), and insert coil 352 into slot 14 of layer 5 (L5) and slot 20 of layer 6 (L6). Then, insert coil 361 into slot 26 of layer 6 (L6) and slot 20 of layer 5 (L5), and insert coil 362 into slot 13 of layer 6 (L6) and slot 7 of layer 5 (L5). Next, insert coil 341 into slot 2 of layer 4 (L4) and slot 44 of layer 3 (L3), insert coil 342 into slot 37 of layer 4 (L4) and slot 31 of layer 3 (L3), insert coil 343 into slot 26 of layer 4 (L4) and slot 20 of layer 3 (L3), and insert coil 344 into slot 13 of layer 4 (L4) and slot 7 of layer 3 (L3). Finally, coils 321, 322, 311, 312, 331, 332, 333, 334, 351, 352, 361, 362, 341, 342, 343, and 344 are sequentially electrically connected (either directly or through short-pitch coils) and connected in series. This means that the eighth coil group U32, the seventh coil group U31, the ninth coil group U33, the eleventh coil group U35, the twelfth coil group U36, and the tenth coil group U34 are sequentially connected in series to complete the winding operation of the third sub-winding U3.

[0098] like Figure 9 As shown, this embodiment of the invention also provides a drive motor, which includes a rotor assembly A1 and a flat wire stator assembly A2 as described above.

[0099] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A flat wire stator assembly, applied to an M-phase motor with a rotor pole number of 2p; the flat wire stator assembly includes a stator core and an M-phase stator winding, the inner circumference of the stator core having N axially arranged stator slots, and the M-phase stator winding being wound in six layers within the stator slots, wherein N, p, and M are all positive integers; characterized in that, Each phase of the M-phase stator winding includes a sets of parallel-connected sub-windings, where a is a positive integer and not a divisor of 2p; each set of sub-windings includes coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slots, and the number of coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slots in each set of sub-windings is greater than or equal to 2; Each phase of the M-phase stator winding includes three sets of sub-windings, and each set of sub-windings includes n coils connected in series, where n equals N / 3. The number of coils distributed in the first and second layers of the stator slot, the number of coils distributed in the third and fourth layers, and the number of coils distributed in the fifth and sixth layers of each set of sub-windings are all even numbers greater than or equal to 4; The coils in each sub-winding are respectively arranged along the winding direction of the sub-winding, and the lead-out end of the coil and the lead-in end of the connected coil are located in the same layer or adjacent layer of the stator slot; the coil is a U-shaped hairpin copper busbar or an I-shaped copper busbar; Each phase of the stator winding has three sets of sub-windings, namely a first sub-winding, a second sub-winding, and a third sub-winding; The first sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and 3n / 8 coils distributed in the fifth and sixth layers of the stator slots; The second sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and 3n / 8 coils distributed in the fifth and sixth layers of the stator slots; The third sub-winding includes n / 4 coils distributed in the first and second layers of the stator slots, n / 2 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots.

2. The flat wire stator assembly according to claim 1, characterized in that, M is 3, p is 4, and N is 48; The first sub-winding includes a first coil group located in the first and second layers of the stator slot, a second coil group located in the third and fourth layers of the stator slot, and a third coil group located in the fifth and sixth layers of the stator slot; The second sub-winding includes a fourth coil group located in the first and second layers of the stator slot, a fifth coil group located in the third and fourth layers of the stator slot, and a sixth coil group located in the fifth and sixth layers of the stator slot, wherein the fourth coil group, the fifth coil group, and the sixth coil group are wound in opposite directions to the first sub-winding. The third sub-winding includes a seventh coil group located in the first and second layers of the stator slot, an eighth coil group located in the first and second layers of the stator slot, a ninth coil group located in the third and fourth layers of the stator slot, a tenth coil group located in the third and fourth layers of the stator slot, an eleventh coil group located in the fifth and sixth layers of the stator slot, and a twelfth coil group located in the fifth and sixth layers of the stator slot. The seventh, ninth, and eleventh coil groups are wound in the same direction as the first sub-winding, while the eighth, tenth, and twelfth coil groups are wound in the opposite direction to the first sub-winding.

3. The flat wire stator assembly according to claim 2, characterized in that, The eighth, seventh, ninth, eleventh, twelfth, and tenth coil groups of the third sub-winding are connected in series, and the phase voltage lead of the third sub-winding is conductively connected to the eighth coil group located in the second layer of the stator slot, and the neutral lead is conductively connected to the ninth coil group located in the third layer of the stator slot. The phase voltage lead of the first sub-winding and the neutral lead of the second sub-winding are respectively connected to the coil in the first layer of the stator slot, and the neutral lead of the first sub-winding and the phase voltage lead of the second sub-winding are respectively connected to the coil in the sixth layer of the stator slot.

4. The flat wire stator assembly according to claim 2 or 3, characterized in that, The first coil group and the third coil group each include six equidistant coils, and the six equidistant coils of the first coil group and the third coil group are connected in series; the second coil group includes four equidistant coils, and the four equidistant coils of the second coil group are connected in series; the first coil group, the second coil group and the third coil group are connected in series in sequence through two short-pitch coils. The fourth and sixth coil groups each include six equidistant coils, and the six equidistant coils of the fourth and sixth coil groups are connected in series; the fifth coil group includes four equidistant coils, and the four equidistant coils of the fifth coil group are connected in series; the fourth, fifth, and sixth coil groups are connected in series sequentially through two short-pitch coils. The seventh, eighth, eleventh, and twelfth coil groups each include two equidistant coils, and the ninth and fourth coil groups each include four equidistant coils. The eighth, seventh, ninth, eleventh, twelfth, and tenth coil groups are connected in series sequentially through five short-pitch coils.

5. A flat wire stator assembly, applied to an M-phase motor with a rotor pole number of 2p; the flat wire stator assembly includes a stator core and an M-phase stator winding, the inner circumference of the stator core having N axially arranged stator slots, and the M-phase stator winding being wound in six layers within the stator slots, wherein N, p, and M are all positive integers; characterized in that, Each phase of the M-phase stator winding includes a sets of parallel-connected sub-windings, where a is a positive integer and not a divisor of 2p; each set of sub-windings includes coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slots, and the number of coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slots in each set of sub-windings is greater than or equal to 2; Each phase of the M-phase stator winding includes three sets of sub-windings, and each set of sub-windings includes n coils connected in series, where n equals N / 3. The number of coils distributed in the first and second layers of the stator slot, the number of coils distributed in the third and fourth layers, and the number of coils distributed in the fifth and sixth layers of each set of sub-windings are all even numbers greater than or equal to 4; The coils in each sub-winding are respectively arranged along the winding direction of the sub-winding, and the lead-out end of the coil and the lead-in end of the connected coil are located in the same layer or adjacent layer of the stator slot; the coil is a U-shaped hairpin copper busbar or an I-shaped copper busbar; Each phase of the stator winding has three sets of sub-windings, namely a first sub-winding, a second sub-winding, and a third sub-winding; The first sub-winding includes n / 4 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and 3n / 8 coils distributed in the fifth and sixth layers of the stator slots; The second sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots; The third sub-winding includes n / 2 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots.

6. A flat wire stator assembly, applied to an M-phase motor with a rotor pole number of 2p; the flat wire stator assembly includes a stator core and an M-phase stator winding, the inner circumference of the stator core having N axially arranged stator slots, and the M-phase stator winding being wound in six layers within the stator slots, wherein N, p, and M are all positive integers; characterized in that, Each phase of the M-phase stator winding includes a sets of parallel-connected sub-windings, where a is a positive integer and not a divisor of 2p; each set of sub-windings includes coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slots, and the number of coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slots in each set of sub-windings is greater than or equal to 2; Each phase of the M-phase stator winding includes three sets of sub-windings, and each set of sub-windings includes n coils connected in series, where n equals N / 3. The number of coils distributed in the first and second layers of the stator slot, the number of coils distributed in the third and fourth layers, and the number of coils distributed in the fifth and sixth layers of each set of sub-windings are all even numbers greater than or equal to 4; The coils in each sub-winding are respectively arranged along the winding direction of the sub-winding, and the lead-out end of the coil and the lead-in end of the connected coil are located in the same layer or adjacent layer of the stator slot; the coil is a U-shaped hairpin copper busbar or an I-shaped copper busbar; Each phase of the stator winding has three sets of sub-windings, namely a first sub-winding, a second sub-winding, and a third sub-winding; The first sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots; The second sub-winding includes 3n / 8 coils distributed in the first and second layers of the stator slots, 3n / 8 coils distributed in the third and fourth layers of the stator slots, and n / 4 coils distributed in the fifth and sixth layers of the stator slots; The third sub-winding includes n / 4 coils distributed in the first and second layers of the stator slots, n / 4 coils distributed in the third and fourth layers of the stator slots, and n / 2 coils distributed in the fifth and sixth layers of the stator slots.

7. A drive motor, characterized in that, It includes a rotor assembly and a flat wire stator assembly as described in any one of claims 1-6.

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