Flat wire stator assembly and drive motor

Abstract

The application provides a flat wire stator assembly and a driving motor, which 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 stator winding of the M-phase stator winding comprises a set of sub-windings, a is a positive integer greater than 2 and is not a divisor of the 2p; each set of the sub-windings comprises coils distributed in the first layer and the second layer, the third layer and the fourth layer and the fifth layer and the sixth layer of the stator slot, and the number of coils of at least two sets of the sub-windings distributed in the first layer and the second layer, the third layer and the fourth layer and the fifth layer and the sixth layer of the stator slot is equal. The embodiment of the application effectively reduces the additional copper loss caused by winding circulating current by making the inductance asymmetry between each set of sub-windings smaller.

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 greater than 2 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 at least two sets of sub-windings are equal.

[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] 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;

[0011] The first sub-winding includes 5n / 16 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 5n / 16 coils distributed in the fifth and sixth layers of the stator slots; the second sub-winding includes 5n / 16 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 5n / 16 coils distributed in the fifth and sixth layers of the stator slots; the third 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.

[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, 5n / 16 coils distributed in the third and fourth layers of the stator slots, and 5n / 16 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, 5n / 16 coils distributed in the third and fourth layers of the stator slots, and 5n / 16 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, 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.

[0014] 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;

[0015] The first sub-winding includes 5n / 16 coils distributed in the first and second layers of the stator slots, 5n / 16 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 5n / 16 coils distributed in the first and second layers of the stator slots, 5n / 16 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 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.

[0016] Preferably, M is 3, p is 4, and N is 48;

[0017] 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;

[0018] 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 coils in the fifth coil group are not directly connected in series.

[0019] 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 third and fourth layers of the stator slot, and a ninth coil group located in the fifth and sixth layers of the stator slot, wherein the coils in the eighth coil group are not directly connected in series.

[0020] Preferably, the first coil group includes a first winding coil, a second winding coil, and a third winding coil with their input ends located in the first layer of the stator slot; a fourth winding coil and a fifth winding coil with their input ends located in the second layer of the stator slot; the second coil group includes a sixth winding coil, a seventh winding coil, and an eighth winding coil with their input ends located in the third layer of the stator slot; a ninth winding coil, a tenth winding coil, and an eleventh winding coil with their input ends located in the fourth layer of the stator slot; and the third coil group includes a twelfth winding coil and a thirteenth winding coil with their input ends located in the fifth layer of the stator slot; and a fourteenth winding coil, a fifteenth winding coil, and a sixteenth winding coil with their input ends located in the sixth layer of the stator slot.

[0021] The first coil, sixth coil, twelfth coil, fourteenth coil, ninth coil, fourth coil, fifteenth coil, tenth coil, sixteenth coil, eleventh coil, fifth coil, second coil, seventh coil, thirteenth coil, third coil, and eighth coil of the first sub-winding are connected in series in sequence. The phase voltage lead of the first sub-winding is conductively connected to the inlet end of the first coil located in the first layer of the stator slot, and the neutral lead is conductively connected to the outlet end of the eighth coil located in the fourth layer of the stator slot.

[0022] The fourth coil group includes a first coil and a second coil with their inlet ends located in the first layer of the stator slot, a third coil, a fourth coil, and a fifth coil with their inlet ends located in the second layer of the stator slot; the fifth coil group includes a sixth coil, a seventh coil, and an eighth coil with their inlet ends located in the third layer of the stator slot, a ninth coil, a tenth coil, and an eleventh coil with their inlet ends located in the fourth layer of the stator slot; the sixth coil group includes a twelfth coil, a thirteenth coil, and a fourteenth coil with their inlet ends located in the fifth layer of the stator slot, and a fifteenth coil and a sixteenth coil with their inlet ends located in the sixth layer of the stator slot;

[0023] The second sub-winding consists of the ninth, third, fifteenth, tenth, fourth, first, sixth, twelfth, seventh, thirteenth, second, eighth, fourteenth, sixteenth, eleventh, and fifth coils connected in series. The phase voltage lead of the second sub-winding is conductively connected to the inlet end of the ninth coil located in the fourth layer of the stator slot, and the neutral lead is conductively connected to the outlet end of the fifth coil located in the first layer of the stator slot.

[0024] Preferably, the seventh coil group includes a first coil, a second coil, and a third coil with their inlet ends located in the first layer of the stator slot; a fourth coil, a fifth coil, and a sixth coil with their inlet ends located in the second layer of the stator slot; the eighth coil group includes a seventh coil and an eighth coil with their inlet ends located in the third layer of the stator slot; a ninth coil and a tenth coil with their inlet ends located in the fourth layer of the stator slot; and the ninth coil group includes an eleventh coil, a twelfth coil, and a thirteenth coil with their inlet ends located in the fifth layer of the stator slot; and a fourteenth coil, a fifteenth coil, and a sixteenth coil with their inlet ends located in the sixth layer of the stator slot.

[0025] The fourteenth, ninth, fourth, fifteenth, eleventh, first, seventh, twelfth, second, eighth, thirteenth, third, fifth, sixteenth, tenth, and sixth coils of the third sub-winding are connected in series in sequence. The phase voltage lead of the third sub-winding is conductively connected to the lead-in end of the fourteenth coil located in the sixth layer of the stator slot, and the neutral lead is conductively connected to the lead-out end of the sixth coil located in the first layer of the stator slot.

[0026] Preferably, the seventh coil group includes a first coil, a second coil, and a third coil with their inlet ends located in the first layer of the stator slot; a fourth coil, a fifth coil, and a sixth coil with their inlet ends located in the second layer of the stator slot; the eighth coil group includes a seventh coil and an eighth coil with their inlet ends located in the third layer of the stator slot; a ninth coil and a tenth coil with their inlet ends located in the fourth layer of the stator slot; and the ninth coil group includes an eleventh coil, a twelfth coil, and a thirteenth coil with their inlet ends located in the fifth layer of the stator slot; and a fourteenth coil, a fifteenth coil, and a sixteenth coil with their inlet ends located in the sixth layer of the stator slot.

[0027] The first, seventh, eleventh, twelfth, fourteenth, ninth, fourth, fifth, fifteenth, sixteenth, tenth, sixth, second, third, eighth, and thirteenth coils of the third winding are connected in series in sequence. The phase voltage lead of the third sub-winding is conductively connected to the inlet end of the first coil of the third winding located in the first layer of the stator slot, and the neutral lead is conductively connected to the outlet end of the thirteenth coil of the third winding located in the sixth layer of the stator slot.

[0028] 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.

[0029] 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 respectively, the asymmetry of inductance between the sets of sub-windings of each phase stator winding can be reduced, thereby reducing the winding circulating current of the M-phase stator winding and thus reducing additional copper losses; since the number of coils in at least two sets of sub-windings of each phase stator winding distributed in the first and second, third and fourth, and fifth and sixth layers of the stator slots is equal, that is, the number of coils in one set of sub-windings distributed in the first and second, third and fourth, and fifth and sixth layers of the stator slots is equal to the number of coils in the other set of sub-windings distributed in the first and second, third and fourth, and fifth and sixth layers of the stator slots. The number of coils in the first and second layers, the third and fourth layers, and the fifth and sixth layers are equal. This effectively optimizes the connection method of the M-phase stator winding, ensuring that the coils of each set of sub-windings in each phase stator winding can be connected in series to the first and second layers, the third and fourth layers, and the fifth and sixth layers of the stator slot, thus improving the rationality of the M-phase stator winding connection method. Since 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 slot, the coils of the same set of sub-windings do not need to be connected across layers. That is, there is no need to use long copper busbars for connection during assembly, which not only reduces material costs but also effectively reduces the difficulty of assembly operations, making the assembly efficiency higher. Attached Figure Description

[0030] 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;

[0031] 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.

[0032] 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;

[0033] 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;

[0034] Figure 5 This is a schematic diagram showing the distribution of coils in each stator slot of the stator core in the flat wire stator assembly provided in this embodiment of the invention;

[0035] Figure 6 This is a schematic diagram of the winding structure of the first sub-winding in each phase stator winding of the flat wire stator assembly provided in the embodiment of the present invention on the stator core;

[0036] Figure 7 This is a schematic diagram of the winding structure of the second sub-winding in each phase stator winding of the flat wire stator assembly provided in this embodiment of the invention on the stator core;

[0037] Figure 8 This is a schematic diagram of the winding structure of the third sub-winding in each phase stator winding of the flat wire stator assembly provided in this embodiment of the invention on the stator core.

[0038] Figure 9 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;

[0039] Figure 10 This is a schematic diagram of the winding structure of the third sub-winding in each phase stator winding of the flat wire stator assembly provided in another embodiment of the present invention on the stator core;

[0040] Figure 11 This is a schematic diagram of the drive motor provided in an embodiment of the present invention. Detailed Implementation

[0041] 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.

[0042] 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 electric vehicles.

[0043] 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 may 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.

[0044] 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.

[0045] Specifically, 'a' is a positive integer greater than 2, and the number of coils in at least two sets of sub-windings of each phase stator winding distributed 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 stator slot 7 is equal. That is, the number of coils in one set of sub-windings of each phase stator winding distributed 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 stator slot 7 is equal to the number of coils in the other set of sub-windings of the same phase stator winding distributed 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 stator slot 7. The above configuration can effectively optimize the connection method of the three-phase stator winding, so that the coils of each set of sub-windings of each phase stator winding can be evenly wound in N stator slots 7, so that the coils of each set of sub-windings of each phase stator winding can be connected in series to the first layer L1, the second layer L2, the third layer L3 and the fourth layer L4, as well as the fifth layer L5 and the sixth layer L6 of the stator slot 7, thereby greatly improving the rationality of the connection method of the three-phase stator winding.

[0046] Because the above configuration optimizes the connection method of the three-phase stator windings, each set of sub-windings for each phase stator winding can include coils distributed in the first layer L1 and the second layer L2 of stator slot 7, the third layer L3 and the fourth layer L4, and the fifth layer L5 and the sixth layer L6. In practical applications, 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 sub-winding set are preferably greater than or equal to 2. This makes the number of coils distributed among the layers more uniform and reasonable, thereby improving the balance of coil distribution.

[0047] The aforementioned flat wire stator assembly, by connecting the coils of each sub-winding set in series to the first layer L1, second layer L2, third layer L3, fourth layer L4, fifth layer L5, and sixth layer L6 of stator slot 7, reduces the inductance asymmetry between the sub-winding sets of each phase stator winding. This means that the back EMF, resistance, and inductance of each parallel sub-winding set of each phase stator winding are approximately the same, reducing the circulating current in the three-phase stator windings, thereby reducing additional copper losses, improving motor efficiency, and lowering the temperature rise of the stator windings. Furthermore, when this flat wire stator assembly is applied in electric vehicles, it can effectively improve NVH performance and enhance the market competitiveness of electric vehicles.

[0048] Furthermore, since each set of sub-windings includes coils distributed in the first layer L1 and the second layer L2 of the 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.

[0049] 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.

[0050] 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.

[0051] Example 1

[0052] 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:

[0053] Each phase stator winding's first sub-winding includes 5n / 16 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 5n / 16 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0054] The second sub-winding of each phase stator winding includes 5n / 16 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 5n / 16 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0055] The third 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.

[0056] Example 2

[0057] 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:

[0058] 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, 5n / 16 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and 5n / 16 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0059] 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, 5n / 16 coils distributed in the third layer L3 and the fourth layer L4 of stator slot 7, and 5n / 16 coils distributed in the fifth layer L5 and the sixth layer L6 of stator slot 7.

[0060] 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, 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.

[0061] Example 3

[0062] 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:

[0063] Each phase of the stator winding has a first sub-winding consisting of 5n / 16 coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, 5n / 16 coils distributed in the third layer L3 and the fourth layer L4 of the stator slot 7, and 3n / 8 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slot 7.

[0064] The second sub-winding of each phase stator winding includes 5n / 16 coils distributed in the first layer L1 and the second layer L2 of stator slot 7, 5n / 16 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.

[0065] The third 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.

[0066] 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.

[0067] like Figure 6-8 The diagrams shown are detailed wiring diagrams of the first sub-winding U1, the second sub-winding U2, and the third sub-winding U3 in the U-phase winding of the flat wire stator assembly. The reference numerals 1, 2, 3...47, 48 in the three diagrams represent the numbers of the 48 stator slots 7 (i.e., slots 1, 2, 3...47, 48 of stator slots 7). The inverted V mark on each layer represents the coil, and the end connected to the inverted V dotted line represents the current layer, while 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.

[0068] Specifically, the first sub-winding U1 includes first coil groups U11 and U12 located in the first layer L1 and the second layer L2 of stator slot 7, second coil groups U13 and U14 located in the third layer L3 and the fourth layer L4 of stator slot 7, and third coil groups U15 and U16 located in the fifth layer L5 and the sixth layer L6 of stator slot 7, and the coils in the second coil groups U13 and U14 are not directly connected in series.

[0069] Combination Figure 6As shown, the first coil groups U11 and U12 of the first sub-winding U1 include a first coil 111, a second coil 112, and a third coil 113 with their inlet ends located in the first layer L1 of the stator slot 7, and a fourth coil 121 and a fifth coil 122 with their inlet ends located in the second layer L2 of the stator slot 7. The second coil groups U13 and U14 include a sixth coil 131, a seventh coil 132, and an eighth coil 133 with their inlet ends located in the third layer L3 of the stator slot 7, and a ninth coil 141, a tenth coil 142, and an eleventh coil 143 with their inlet ends located in the fourth layer L4 of the stator slot 7. The third coil groups U15 and U16 include a twelfth coil 151 and a thirteenth coil 152 with their inlet ends located in the fifth layer L5 of stator slot 7, and a fourteenth coil 161, a fifteenth coil 162 and a sixteenth coil 163 with their inlet ends located in the sixth layer L6 of stator slot 7.

[0070] During assembly, the first coil 111 of a winding is inserted into slot 1 of the first layer L1 and slot 7 of the second layer L2; the sixth coil 131 of a winding is inserted into slot 13 of the third layer L3 and slot 19 of the fourth layer L4; the twelfth coil 151 of a winding is inserted into slot 25 of the fifth layer L5 and slot 31 of the sixth layer L6; the fourteenth coil 161 of a winding is inserted into slot 38 of the sixth layer L6 and slot 32 of the fifth layer L5; the ninth coil 141 of a winding is inserted into slot 26 of the fourth layer L4 and slot 20 of the third layer L3; and the fourth coil 121 of a winding is inserted into slot 14 of the second layer L2 and slot 8 of the first layer L1. Then, insert the fifteenth coil 162 of one winding into slot 2 of the sixth layer L6 and slot 44 of the fifth layer L5; insert the tenth coil 142 of one winding into slot 38 of the fourth layer L4 and slot 32 of the third layer L3; insert the sixteenth coil 163 of one winding into slot 26 of the sixth layer L6 and slot 20 of the fifth layer L5; insert the eleventh coil 143 of one winding into slot 14 of the fourth layer L4 and slot 8 of the third layer L3; and insert the fifth coil 122 of one winding into slot 2 of the second layer L2 and slot 44 of the first layer L1. The second coil 112 of a winding is inserted into slot 37 of the first layer L1 and slot 43 of the second layer L2. The seventh coil 132 of a winding is inserted into slot 1 of the third layer L3 and slot 7 of the fourth layer L4. The thirteenth coil 152 of a winding is inserted into slot 13 of the fifth layer L5 and slot 19 of the sixth layer L6. The third coil 113 of a winding is inserted into slot 25 of the first layer L1 and slot 31 of the second layer L2. The eighth coil 133 of a winding is inserted into slot 37 of the third layer L3 and slot 43 of the fourth layer L4.

[0071] Finally, the first coil 111, the sixth coil 131, the twelfth coil 151, the fourteenth coil 161, the ninth coil 141, the fourth coil 121, the fifteenth coil 162, the tenth coil 142, the sixteenth coil 163, the eleventh coil 143, the fifth coil 122, the second coil 112, the seventh coil 132, the thirteenth coil 152, the third coil 113, and the eighth coil 133 of the first winding are sequentially electrically connected (either directly or through coils) in series to complete the winding operation of the first sub-winding U1.

[0072] In addition, 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 first coil 111 of the winding located in the stator slot 7, and the neutral lead U1- is connected to the lead-out end of the fourth layer L4 of the eighth coil 133 of the winding located in the stator slot 7.

[0073] Furthermore, the first coil 111 of a winding is connected in series with the sixth coil 131 of a winding via a short-pitch coil 401; the sixth coil 131 of a winding is connected in series with the twelfth coil 151 of a winding via a short-pitch coil 402; the twelfth coil 151 of a winding is connected in series with the fourteenth coil 161 of a winding via a short-pitch coil 403; the fourteenth coil 161 of a winding is connected in series with the ninth coil 141 of a winding via a short-pitch coil 404; the ninth coil 141 of a winding is connected in series with the fourth coil 121 of a winding via a short-pitch coil 405; the fourth coil 121 of a winding is connected in series with the fifteenth coil 162 of a winding via a long-pitch coil 406; the fifteenth coil 162 of a winding is connected in series with the tenth coil 142 of a winding via a short-pitch coil 407; the tenth coil 142 of a winding is connected in series with the tenth coil 142 of a winding via a short-pitch coil 407; Short-pitch coil 408 is connected in series with the sixteenth coil 163 of a winding; the sixteenth coil 163 of a winding is connected in series with the eleventh coil 143 of a winding via short-pitch coil 409; the eleventh coil 143 of a winding is connected in series with the fifth coil 122 of a winding via short-pitch coil 410; the fifth coil 122 of a winding is connected in series with the second coil 112 of a winding via short-pitch coil 411; the second coil 112 of a winding is connected in series with the seventh coil 132 of a winding via short-pitch coil 412; the seventh coil 132 of a winding is connected in series with the thirteenth coil 152 of a winding via short-pitch coil 413; the thirteenth coil 152 of a winding is connected in series with the third coil 113 of a winding via short-pitch coil 414; the third coil 113 of a winding is connected with the eighth coil 133 of a winding via short-pitch coil 415.

[0074] Of course, in practical applications, when the lead end of one coil and the lead end of the other coil in the first sub-winding U1 of each phase stator winding are located in the same or adjacent layers, the two coils can also be connected by direct welding.

[0075] The aforementioned second sub-winding U2 includes the fourth coil groups U21 and U22 located in the first layer L1 and the second layer L2 of stator slot 7, the fifth coil groups U23 and U24 located in the third layer L3 and the fourth layer L4 of stator slot 7, and the sixth coil groups U25 and U26 located in the fifth layer L5 and the sixth layer L6 of stator slot 7, and the coils in the fifth coil groups U23 and U24 are not directly connected in series.

[0076] Combination Figure 7 As shown, the fourth coil groups U21 and U22 of the second sub-winding U2 include a first coil 211 and a second coil 212 of the second winding with their inlet ends located in the first layer L1 of the stator slot 7, and a third coil 221, a fourth coil 222, and a fifth coil 223 of the second winding with their inlet ends located in the second layer L2 of the stator slot 7. The fifth coil groups U23 and U24 include a sixth coil 231, a seventh coil 232, and an eighth coil 233 of the second winding with their inlet ends located in the third layer L3 of the stator slot 7, and a ninth coil 241, a tenth coil 242, and an eleventh coil 243 of the second winding with their inlet ends located in the fourth layer L4 of the stator slot 7. The sixth coil groups U25 and U26 include the twelfth coil 251, the thirteenth coil 252 and the fourteenth coil 253 of the second winding, which are located in the fifth layer L5 of stator slot 7, and the fifteenth coil 261 and the sixteenth coil 262 of the second winding, which are located in the sixth layer L6 of stator slot 7.

[0077] During assembly, insert the ninth coil 241 of the second winding into slot 1 of the fourth layer L4 and slot 43 of the third layer L3; insert the third coil 221 of the second winding into slot 37 of the second layer L2 and slot 31 of the first layer L1. Then, insert the fifteenth coil 261 of the second winding into slot 25 of the sixth layer L6 and slot 19 of the fifth layer L5; insert the tenth coil 242 of the second winding into slot 13 of the fourth layer L4 and slot 7 of the third layer L3; insert the fourth coil 222 of the second winding into slot 1 of the second layer L2 and slot 43 of the first layer L1; and insert the first coil 211 of the second winding into slot 2 of the first layer L1 and slot 8 of the second layer L2. Insert the sixth coil 231 of the second winding into slot 14 of the third layer L3 and slot 20 of the fourth layer L4. Insert the twelfth coil 251 of the second winding into slot 26 of the fifth layer L5 and slot 32 of the sixth layer L6. Insert the seventh coil 232 of the second winding into slot 38 of the third layer L3 and slot 44 of the fourth layer L4. Insert the thirteenth coil 252 of the second winding into slot 2 of the fifth layer L5 and slot 8 of the sixth layer L6. Next, the second coil 212 of the second winding is inserted into slot 14 of the first layer L1 and slot 20 of the second layer L2. The eighth coil 233 of the second winding is inserted into slot 26 of the third layer L3 and slot 32 of the fourth layer L4. The fourteenth coil 253 of the second winding is inserted into slot 38 of the fifth layer L5 and slot 44 of the sixth layer L6. The sixteenth coil 262 of the second winding is inserted into slot 37 of the sixth layer L6 and slot 31 of the fifth layer L5. The eleventh coil 243 of the second winding is inserted into slot 25 of the fourth layer L4 and slot 19 of the third layer L3. The fifth coil 223 of the second winding is inserted into slot 13 of the second layer L2 and slot 7 of the first layer L1.

[0078] Finally, the ninth coil 241, the third coil 221, the fifteenth coil 261, the tenth coil 242, the fourth coil 222, the first coil 211, the sixth coil 231, the twelfth coil 251, the seventh coil 232, the thirteenth coil 252, the second coil 212, the eighth coil 233, the fourteenth coil 253, the sixteenth coil 262, the eleventh coil 243, and the fifth coil 223 of the second winding are sequentially electrically connected (either directly or through coils) in series to complete the winding operation of the second sub-winding U2.

[0079] In addition, the phase voltage lead U2+ of the second sub-winding U2 is connected to the lead-in end of the fourth layer L4 of the ninth coil 241 of the second winding located in the stator slot 7, and the neutral lead U2- is connected to the lead-out end of the fifth coil 223 of the second winding located in the first layer L1 of the stator slot 7.

[0080] Furthermore, the ninth coil 241 of the second winding is connected in series with the third coil 221 of the second winding via a short-pitch coil 501; the third coil 221 of the second winding is connected in series with the fifteenth coil 261 of the second winding via a long-pitch coil 502; the fifteenth coil 261 of the second winding is connected in series with the tenth coil 242 of the second winding via a short-pitch coil 503; the tenth coil 242 of the second winding is connected in series with the fourth coil 222 of the second winding via a short-pitch coil 504; the fourth coil 222 of the second winding is connected in series with the first coil 211 of the second winding via a short-pitch coil 505; the first coil 211 of the second winding is connected in series with the sixth coil 231 of the second winding via a short-pitch coil 506; the sixth coil 231 of the second winding is connected in series with the twelfth coil 251 of the second winding via a short-pitch coil 507; the twelfth coil 251 of the second winding is connected in series with the twelfth coil 251 via a short-pitch coil 507; 08 is connected in series with the seventh coil 232 of the second winding; the seventh coil 232 of the second winding is connected in series with the thirteenth coil 252 of the second winding through the short-pitch coil 509; the thirteenth coil 252 of the second winding is connected in series with the second coil 212 of the second winding through the long-pitch coil 510; the second coil 212 of the second winding is connected in series with the eighth coil 233 of the second winding through the short-pitch coil 511; the eighth coil 233 of the second winding is connected in series with the fourteenth coil 253 of the second winding through the short-pitch coil 512; the fourteenth coil 253 of the second winding is connected in series with the sixteenth coil 262 of the second winding through the short-pitch coil 513; the sixteenth coil 262 of the second winding is connected in series with the eleventh coil 243 of the second winding through the short-pitch coil 514; the eleventh coil 243 of the second winding is connected in series with the fifth coil 223 of the second winding through the short-pitch coil 515.

[0081] Of course, in practical applications, when the lead end of one coil and the lead end of the other coil in the second sub-winding U2 of each phase stator winding are located in the same or adjacent layers, the two coils can also be connected by direct welding.

[0082] The aforementioned third sub-winding U3 includes the seventh coil groups U31 and U32 located in the first layer L1 and the second layer L2 of stator slot 7, the eighth coil groups U33 and U34 located in the third layer L3 and the fourth layer L4 of stator slot 7, and the ninth coil groups U35 and U36 located in the fifth layer L5 and the sixth layer L6 of stator slot 7, and the coils in the eighth coil groups U33 and U34 are not directly connected in series.

[0083] Combination Figure 8As shown, the seventh coil groups U31 and U32 of the third sub-winding U3 include a first coil 311, a second coil 312, and a third coil 313 with their inlet ends located in the first layer L1 of stator slot 7, and a fourth coil 321, a fifth coil 322, and a sixth coil 323 with their inlet ends located in the second layer L2 of stator slot 7. The eighth coil groups U33 and U34 include a seventh coil 331 and an eighth coil 332 with their inlet ends located in the third layer L3 of stator slot 7, and a ninth coil 341 and a tenth coil 342 with their inlet ends located in the fourth layer L4 of stator slot 7. The ninth coil groups U35 and U36 include the eleventh coil 351, the twelfth coil 352 and the thirteenth coil 353 of the three-winding group located in the fifth layer L5 of stator slot 7, and the fourteenth coil 361, the fifteenth coil 362 and the sixteenth coil 363 of the three-winding group located in the sixth layer L6 of stator slot 7.

[0084] During assembly, insert the fourteenth coil 361 of the three-winding group into slot 1 of layer L6 (sixth layer) and slot 43 of layer L5 (fifth layer); insert the ninth coil 341 of the three-winding group into slot 37 of layer L4 (fourth layer) and slot 31 of layer L3 (third layer); and insert the fourth coil 321 of the three-winding group into slot 25 of layer L2 (second layer) and slot 19 of layer L1 (first layer). Then, insert the fifteenth coil 362 of the three-winding group into slot 13 of layer L6 (sixth layer) and slot 7 of layer L5 (fifth layer); and insert the eleventh coil 351 of the three-winding group into slot 1 of layer L5 (fifth layer) and slot 7 of layer L6 (sixth layer). Next, the first coil 311 of the three-winding group is inserted into slot 13 of the first layer L1 and slot 19 of the second layer L2. The seventh coil 331 of the three-winding group is inserted into slot 25 of the third layer L3 and slot 31 of the fourth layer L4. The twelfth coil 352 of the three-winding group is inserted into slot 37 of the fifth layer L5 and slot 43 of the sixth layer L6. Then, the second coil 312 of the three-winding group is inserted into slot 38 of the first layer L1 and slot 44 of the second layer L2. The eighth coil 332 of the three-winding group is inserted into slot 2 of the third layer L3 and slot 8 of the fourth layer L4. The thirteenth coil 353 of the three-winding group is inserted into slot 14 of the fifth layer L5 and slot 20 of the sixth layer L6. The third coil 313 of the three-winding group is inserted into slot 26 of the first layer L1 and slot 32 of the second layer L2. The fifth coil 322 of the three-winding group is inserted into slot 26 of the second layer L2 and slot 20 of the first layer L1. Next, insert the sixteenth coil 363 of the three-winding group into slot 14 of the sixth layer L6 and slot 8 of the fifth layer L5, insert the tenth coil 342 of the three-winding group into slot 2 of the fourth layer L4 and slot 44 of the third layer L3, and insert the sixth coil 323 of the three-winding group into slot 38 of the second layer L2 and slot 32 of the first layer L1.

[0085] Finally, the fourteenth coil 361, the ninth coil 341, the fourth coil 321, the fifteenth coil 362, the eleventh coil 351, the first coil 311, the seventh coil 331, the twelfth coil 352, the second coil 312, the eighth coil 332, the thirteenth coil 353, the third coil 313, the fifth coil 322, the sixteenth coil 363, the tenth coil 342, and the sixth coil 323 of the third sub-winding U3 are connected in series (either directly or through coils) to complete the winding operation of the third sub-winding U3.

[0086] In addition, the phase voltage lead U3+ of the third sub-winding U3 is conductively connected to the lead-in end of the fourteenth coil 361 of the three winding located in the sixth layer L6 of the stator slot 7, and the neutral lead U3- is conductively connected to the lead-out end of the sixth coil 323 of the three winding located in the first layer L1 of the stator slot 7.

[0087] Furthermore, the fourteenth coil 361 of the three-winding group is connected in series with the ninth coil 341 of the three-winding group through a short-pitch coil 601; the ninth coil 341 of the three-winding group is connected in series with the fourth coil 321 of the three-winding group through a short-pitch coil 602; the fourth coil 321 of the three-winding group is connected in series with the fifteenth coil 362 of the three-winding group through a long-pitch coil 603; the fifteenth coil 362 of the three-winding group is connected in series with the eleventh coil 351 of the three-winding group through a short-pitch coil 604; the eleventh coil 351 of the three-winding group is connected in series with the first coil 311 of the three-winding group through a long-pitch coil 605; the first coil 311 of the three-winding group is connected in series with the seventh coil 331 of the three-winding group through a short-pitch coil 606; the seventh coil 331 of the three-winding group is connected in series with the twelfth coil 352 of the three-winding group through a short-pitch coil 607; the twelfth coil 352 of the three-winding group is connected in series with the eleventh coil 352 of the three-winding group through a long-pitch coil 605; The short-pitch coil 608 is connected in series with the second coil 312 of the third winding; the second coil 312 of the third winding is connected in series with the eighth coil 332 of the third winding through the short-pitch coil 609; the eighth coil 332 of the third winding is connected in series with the thirteenth coil 353 of the third winding through the short-pitch coil 610; the thirteenth coil 353 of the third winding is connected in series with the third coil 313 of the third winding through the short-pitch coil 611; the third coil 313 of the third winding is connected in series with the fifth coil 322 of the third winding through the short-pitch coil 612; the fifth coil 322 of the third winding is connected in series with the sixteenth coil 363 of the third winding through the long-pitch coil 613; the sixteenth coil 363 of the third winding is connected in series with the tenth coil 342 of the third winding through the short-pitch coil 614; and the tenth coil 342 of the third winding is connected in series with the sixth coil 323 of the third winding through the short-pitch coil 615.

[0088] Of course, in practical applications, when the lead end of one coil and the lead end of the other coil in the third sub-winding U3 of each phase stator winding are located in the same or adjacent layers, the two coils can also be connected by direct welding.

[0089] The aforementioned flat wire stator assembly uses the third winding U3 to set the eighth coil groups U33 and U34 in the third layer L3 and the fourth layer L4, and ensures that the coils in the eighth coil groups U33 and U34 are not directly connected in series. This allows for a more even distribution of the number of coils among the seventh coil groups U31 and U32, the eighth coil groups U33 and U34, and the ninth coil groups U35 and U36, thereby achieving higher symmetry in the inductance between the windings of each phase stator winding.

[0090] Combination Figure 9 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.

[0091] like Figure 10 As shown, in another embodiment of the present invention, the winding method of the first sub-winding U1 of each phase stator winding is the same as... Figure 4 The first sub-winding U1 is wound in the same way, and the second sub-winding U2 is wound in the same way. Figure 5 The second sub-winding U2 is wound in the same way. The third sub-winding U3 of each phase stator winding is wound as follows:

[0092] The seventh coil groups U31 and U32 include a first coil 311, a second coil 312, and a third coil 313 with their inlet ends located in the first layer L1 of stator slot 7, and a fourth coil 321, a fifth coil 322, and a sixth coil 323 with their inlet ends located in the second layer L2 of stator slot 7. The eighth coil groups U33 and U34 include a seventh coil 331 and an eighth coil 332 with their inlet ends located in the third layer L3 of stator slot 7, and a ninth coil 341 and a tenth coil 342 with their inlet ends located in the fourth layer L4 of stator slot 7. The ninth coil groups U35 and U36 include the eleventh coil 351, the twelfth coil 352 and the thirteenth coil 353 of the three-winding group located in the fifth layer L5 of stator slot 7, and the fourteenth coil 361, the fifteenth coil 362 and the sixteenth coil 363 of the three-winding group located in the sixth layer L6 of stator slot 7.

[0093] During assembly, insert the first coil 311 of the three-winding system into slot 13 of the first layer L1 and slot 19 of the second layer L2; insert the seventh coil 331 of the three-winding system into slot 25 of the third layer L3 and slot 31 of the fourth layer L4; insert the eleventh coil 351 of the three-winding system into slot 37 of the fifth layer L5 and slot 43 of the sixth layer L6; and insert the twelfth coil 352 of the three-winding system into slot 1 of the fifth layer L5 and slot 7 of the sixth layer L6. Insert the fourteenth coil 361 of the three-winding group into slot 1 of the sixth layer L6 and slot 43 of the fifth layer L5. Insert the ninth coil 341 of the three-winding group into slot 14 of the fourth layer L4 and slot 8 of the third layer L3. Insert the fourth coil 321 of the three-winding group into slot 38 of the second layer L2 and slot 32 of the first layer L1. Insert the fifth coil 322 of the three-winding group into slot 26 of the second layer L2 and slot 20 of the first layer L1. Then, insert the fifteenth coil 362 of the three-winding group into slot 13 of the sixth layer L6 and slot 7 of the fifth layer L5; insert the sixteenth coil 363 of the three-winding group into slot 1 of the sixth layer L6 and slot 43 of the fifth layer L5; insert the tenth coil 342 of the three-winding group into slot 37 of the fourth layer L4 and slot 31 of the third layer L3; and insert the sixth coil 323 of the three-winding group into slot 25 of the second layer L2 and slot 19 of the first layer L1. Insert the second coil 312 of the three-winding group into slot 26 of the first layer L1 and slot 32 of the second layer L2; insert the third coil 313 of the three-winding group into slot 38 of the first layer L1 and slot 44 of the second layer L2; insert the eighth coil 332 of the three-winding group into slot 2 of the third layer L3 and slot 8 of the fourth layer L4; and insert the thirteenth coil 353 of the three-winding group into slot 14 of the fifth layer L5 and slot 20 of the sixth layer L6.

[0094] Finally, the first coil 311, the seventh coil 331, the eleventh coil 351, the twelfth coil 352, the fourteenth coil 361, the ninth coil 341, the fourth coil 321, the fifth coil 322, the fifteenth coil 362, the sixteenth coil 363, the tenth coil 342, the sixth coil 323, the second coil 312, the third coil 313, the eighth coil 332, and the thirteenth coil 353 of the three windings are sequentially electrically connected (either directly or through coils) in series to complete the winding operation of the first sub-winding U1.

[0095] In addition, the phase voltage lead U3+ of the third sub-winding U3 is conductively connected to the lead-in end of the first coil 311 of the third winding located in the first layer L1 of the stator slot 7, and the neutral lead U3- is conductively connected to the lead-out end of the thirteenth coil 353 of the third winding located in the sixth layer L6 of the stator slot 7.

[0096] Furthermore, the first coil 311 of the three-winding system is connected in series with the seventh coil 331 of the three-winding system via a short-pitch coil 601; the seventh coil 331 of the three-winding system is connected in series with the eleventh coil 351 of the three-winding system via a short-pitch coil 602; the eleventh coil 351 of the three-winding system is connected in series with the twelfth coil 352 of the three-winding system via a short-pitch coil 603; the twelfth coil 352 of the three-winding system is connected in series with the fourteenth coil 361 of the three-winding system via a short-pitch coil 604; the fourteenth coil 361 of the three-winding system is connected in series with the ninth coil 341 of the three-winding system via a short-pitch coil 605; the ninth coil 341 of the three-winding system is connected in series with the fourth coil 321 of the three-winding system via a short-pitch coil 606; the fourth coil 321 of the three-winding system is connected in series with the fifth coil 322 of the three-winding system via a short-pitch coil 607; and the fifth coil 322 of the three-winding system is connected in series with the long-pitch coil 606. Coil 608 is connected in series with the fifteenth coil 362 of the third winding; the fifteenth coil 362 of the third winding is connected in series with the sixteenth coil 363 of the third winding through short-pitch coil 609; the sixteenth coil 363 of the third winding is connected in series with the tenth coil 342 of the third winding through short-pitch coil 610; the tenth coil 342 of the third winding is connected in series with the sixth coil 323 of the third winding through short-pitch coil 611; the sixth coil 323 of the third winding is connected in series with the second coil 312 of the third winding through short-pitch coil 612; the second coil 312 of the third winding is connected in series with the third coil 313 of the third winding through short-pitch coil 613; the third coil 313 of the third winding is connected in series with the eighth coil 332 of the third winding through short-pitch coil 614; and the eighth coil 332 of the third winding is connected in series with the thirteenth coil 353 of the third winding through short-pitch coil 615.

[0097] Compared to Figure 8 The winding method (at least four long-pitch coils 603, 605, 608, and 613 need to be connected in series between the wound coils), the above Figure 10 The winding method of the third sub-winding U3 only requires a long-pitch coil 608 to realize the series connection between the coils of the winding, which effectively reduces the number of long-pitch bridging coils. This not only helps control costs, but also facilitates the assembly of the three-phase stator windings, making it highly practical.

[0098] like Figure 11 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 greater than 2 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 at least two sets of sub-windings have the same number of coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers; 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. 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 5n / 16 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 5n / 16 coils distributed in the fifth and sixth layers of the stator slots; the second sub-winding includes 5n / 16 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 5n / 16 coils distributed in the fifth and sixth layers of the stator slots; the third 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. 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 coils in the fifth coil group are not directly connected in series. 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 third and fourth layers of the stator slot, and a ninth coil group located in the fifth and sixth layers of the stator slot, wherein the coils in the eighth coil group are not directly connected in series.

2. The flat wire stator assembly according to claim 1, characterized in that, The first coil group includes a first winding coil, a second winding coil, and a third winding coil with their input ends located in the first layer of the stator slot; a fourth winding coil and a fifth winding coil with their input ends located in the second layer of the stator slot; the second coil group includes a sixth winding coil, a seventh winding coil, and an eighth winding coil with their input ends located in the third layer of the stator slot; a ninth winding coil, a tenth winding coil, and an eleventh winding coil with their input ends located in the fourth layer of the stator slot; the third coil group includes a twelfth winding coil and a thirteenth winding coil with their input ends located in the fifth layer of the stator slot; and a fourteenth winding coil, a fifteenth winding coil, and a sixteenth winding coil with their input ends located in the sixth layer of the stator slot. The first coil, sixth coil, twelfth coil, fourteenth coil, ninth coil, fourth coil, fifteenth coil, tenth coil, sixteenth coil, eleventh coil, fifth coil, second coil, seventh coil, thirteenth coil, third coil, and eighth coil of the first sub-winding are connected in series in sequence. The phase voltage lead of the first sub-winding is conductively connected to the inlet end of the first coil located in the first layer of the stator slot, and the neutral lead is conductively connected to the outlet end of the eighth coil located in the fourth layer of the stator slot. The fourth coil group includes a first coil and a second coil with their inlet ends located in the first layer of the stator slot, a third coil, a fourth coil, and a fifth coil with their inlet ends located in the second layer of the stator slot; the fifth coil group includes a sixth coil, a seventh coil, and an eighth coil with their inlet ends located in the third layer of the stator slot, a ninth coil, a tenth coil, and an eleventh coil with their inlet ends located in the fourth layer of the stator slot; the sixth coil group includes a twelfth coil, a thirteenth coil, and a fourteenth coil with their inlet ends located in the fifth layer of the stator slot, and a fifteenth coil and a sixteenth coil with their inlet ends located in the sixth layer of the stator slot; The second sub-winding consists of the ninth, third, fifteenth, tenth, fourth, first, sixth, twelfth, seventh, thirteenth, second, eighth, fourteenth, sixteenth, eleventh, and fifth coils connected in series. The phase voltage lead of the second sub-winding is conductively connected to the inlet end of the ninth coil located in the fourth layer of the stator slot, and the neutral lead is conductively connected to the outlet end of the fifth coil located in the first layer of the stator slot.

3. The flat wire stator assembly according to claim 2, characterized in that, The seventh coil group includes a first, second, and third three-winding coil with its lead-in end located in the first layer of the stator slot, and a fourth, fifth, and sixth three-winding coil with its lead-in end located in the second layer of the stator slot; the eighth coil group includes a seventh and eighth three-winding coil with its lead-in end located in the third layer of the stator slot, and a ninth and tenth three-winding coil with its lead-in end located in the fourth layer of the stator slot; the ninth coil group includes an eleventh, twelfth, and thirteenth three-winding coil with its lead-in end located in the fifth layer of the stator slot, and a fourteenth, fifteenth, and sixteenth three-winding coil with its lead-in end located in the sixth layer of the stator slot; The fourteenth, ninth, fourth, fifteenth, eleventh, first, seventh, twelfth, second, eighth, thirteenth, third, fifth, sixteenth, tenth, and sixth coils of the third sub-winding are connected in series in sequence. The phase voltage lead of the third sub-winding is conductively connected to the lead-in end of the fourteenth coil located in the sixth layer of the stator slot, and the neutral lead is conductively connected to the lead-out end of the sixth coil located in the first layer of the stator slot.

4. The flat wire stator assembly according to claim 2, characterized in that, The seventh coil group includes a first, second, and third three-winding coil with its lead-in end located in the first layer of the stator slot, and a fourth, fifth, and sixth three-winding coil with its lead-in end located in the second layer of the stator slot; the eighth coil group includes a seventh and eighth three-winding coil with its lead-in end located in the third layer of the stator slot, and a ninth and tenth three-winding coil with its lead-in end located in the fourth layer of the stator slot; the ninth coil group includes an eleventh, twelfth, and thirteenth three-winding coil with its lead-in end located in the fifth layer of the stator slot, and a fourteenth, fifteenth, and sixteenth three-winding coil with its lead-in end located in the sixth layer of the stator slot; The first, seventh, eleventh, twelfth, fourteenth, ninth, fourth, fifth, fifteenth, sixteenth, tenth, sixth, second, third, eighth, and thirteenth coils of the third sub-winding are connected in series in sequence. The phase voltage lead of the third sub-winding is conductively connected to the inlet end of the first coil of the third winding located in the first layer of the stator slot, and the neutral lead is conductively connected to the outlet end of the thirteenth coil of the third winding located in the sixth layer of the stator slot.

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 greater than 2 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 at least two sets of sub-windings have the same number of coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers; 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. 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, 5n / 16 coils distributed in the third and fourth layers of the stator slots, and 5n / 16 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, 5n / 16 coils distributed in the third and fourth layers of the stator slots, and 5n / 16 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, 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.

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 greater than 2 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 at least two sets of sub-windings have the same number of coils distributed in the first and second layers, the third and fourth layers, and the fifth and sixth layers; 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. 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 5n / 16 coils distributed in the first and second layers of the stator slots, 5n / 16 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 5n / 16 coils distributed in the first and second layers of the stator slots, 5n / 16 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 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.

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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