Stator assembly and electric machine

Abstract

The present application relates to a kind of stator assembly, motor and electric drive system, stator assembly includes stator core, stator core has multiple stator teeth and the stator tooth slot formed between stator tooth, stator core is defined with one axis;Stator winding is made of multiple rectangular cross-section conductor elements and part is located in stator tooth slot, conductor element is arranged with 6 layers in each tooth slot, including U-phase winding, V-phase winding and W-phase winding, the winding mode between each phase winding is same, each phase winding has 3-way branch in parallel, and for each phase winding, incoming terminal and outgoing terminal are located in the 1st layer.The present application proposes winding design mode suitable for 54-slot 6-layer stator based on three-way parallel design, avoids phase internal circulation, facilitates busbar design and manufacture, simultaneously makes the specification number of conductor element less, reduces manufacturing process complexity, improves manufacturing efficiency.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a stator assembly and a motor. Background Technology

[0002] For drive motors, their power performance is extremely important to the performance of vehicles. To improve the power performance of drive motors, flat wire motors have a natural advantage over motors with windings formed by conductors with circular cross-sections. Because their windings use conductors with rectangular cross-sections, the conductors can be closely arranged inside the slots, achieving a higher slot fill factor, thereby increasing the motor's power density and reducing its thermal load.

[0003] Just as the focus of a vehicle transmission is on arranging basic components such as gears, shafts, and clutches to form different gears, a key design focus of flat-wire motors is on arranging the two basic components, U-pin and I-pin, to form different windings. The applicant has proposed several different winding designs for flat-wire motors, and various other flat-wire motor winding designs have also been proposed by other applicants in this field. Due to varying requirements, and the differences in electrical performance, conductor quantity and specifications, manufacturing processes, and busbar manufacturing processes resulting from different winding methods, the winding design of flat-wire motors remains an area where new solutions are constantly emerging.

[0004] For a 6-pole 54-slot motor, among the solutions known to the applicant, there are already 4 / 6 / 8 / 10 layer designs with 1 or 2 parallel windings. Such designs have a high number of winding turns, which makes it difficult to increase the high-speed power of the motor. Summary of the Invention

[0005] In view of the above, the present invention proposes the following technical solution.

[0006] A stator assembly, comprising:

[0007] A stator core having a plurality of stator teeth and stator slots formed between the stator teeth, the stator core defining an axis;

[0008] The stator winding, a portion of which is located within the stator slots, is made of multiple conductor elements with rectangular cross-sections. Six layers of conductor elements are arranged within each slot. The stator winding includes U-phase, V-phase, and W-phase windings, with each phase winding having the same winding method. The layer furthest from the axis is layer 1, and the layer closest to the axis is layer 6. The other layers are arranged sequentially between layers 1 and 6.

[0009] Each phase winding has three parallel branches, and for each phase winding, the input and output terminals are located on the first layer.

[0010] According to one example of the invention, each branch of each phase winding has 6 winding cycles, in which the conductor element of the branch is located in 6 stator slots respectively during each winding cycle.

[0011] According to one example of the invention, for each branch of each phase winding, the conductor element located in 6 stator slots has 5 spans, wherein the 1st, 3rd, and 5th spans are all 9.

[0012] According to one example of the invention, for each branch of each phase winding, in the first three cycles, the layer in which the conductor element is located changes sequentially between layer 2i-1 and layer 2i, where i is the cycle number, while in the last three cycles, the layer in which the conductor element is located changes sequentially between layer 14-2i and layer 13-2i.

[0013] According to one example of the invention, for each branch of each phase winding, the windings are connected sequentially in the slots along a first direction in the first three cycles, and in the last three cycles, the windings are connected sequentially in the slots along a second direction opposite to the first direction.

[0014] According to one example of the present invention, for the first branch, in the six cycles, the span variation pattern is the same for cycles with odd-numbered cycles and the span variation pattern is the same for cycles with even-numbered cycles, and the spans in each cycle are 9-10-9-7-9, 9-10-9-10-9, 9-10-9-7-9, 9-10-9-10-9, 9-10-9-7-9, 9-10-9-10-9; and / or

[0015] When changing from one cycle to the next, the span is 9-9-11-9-9.

[0016] According to one example of the invention, for the second branch, the spans in each cycle are 9-10-9-10-9, 9-7-9-10-9, 9-10-9-10-9, 9-10-9-7-9, 9-7-9-10-9, 9-10-9-7-9; and / or

[0017] When changing from one cycle to the next, the span is 9-9-8-12-9.

[0018] According to one example of the invention, for the third branch, the spans in each cycle are 9-7-9-10-9, 9-10-9-7-9, 9-7-9-10-9, 9-7-9-10-9, 9-10-9-10-9, 9-7-9-10-9; and / or

[0019] When changing from one cycle to the next, the span is 9-12-8-9-9.

[0020] According to one example of the present invention, the stator windings have two self-crossing methods between the 6th layer: crossing 8 and crossing 11; the crossing methods between the 1st and 2nd layers, between the 3rd and 4th layers, and between the 5th and 6th layers all include crossing 7, 9, and 10; the crossing method between the 2nd and 3rd layers is one: crossing 9; the crossing methods between the 4th and 5th layers include crossing 9 and 12; each phase winding crosses the wires 6 times according to this pattern after entering the winding and then exits the winding.

[0021] According to one example of the invention, the stator winding crossover pattern in each winding cycle includes crossings 7, 9 and 10, and the crossover pattern between two adjacent winding cycles includes crossings 8, 9, 11 and 12.

[0022] The present invention also proposes an electric motor, including a rotor assembly and a stator assembly, wherein the stator assembly adopts the stator assembly described above.

[0023] The present invention also proposes an electric drive system, including at least one of a reducer and an inverter, and the aforementioned motor.

[0024] As can be seen from the above, the present invention proposes a 54-slot, 6-layer stator winding, which has the following advantages:

[0025] (1) The use of a three-way parallel branch design improves the high-speed power of the motor;

[0026] (2) By designing the windings of each branch, the manufacturing complexity of the stator windings and the busbars connected to them is reduced, while the number of conductor components is reduced, the manufacturing process complexity is reduced, and the manufacturing efficiency is improved.

[0027] (3) It balances the potential and avoids intraphase circulation.

[0028] Other features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] Exemplary embodiments of the present invention are described with reference to the accompanying drawings, wherein:

[0030] Figure 1 A perspective view of a stator winding according to an embodiment of the present invention is shown.

[0031] Figure 2 A three-dimensional view is shown after the two U-pins are connected.

[0032] Figure 3 A perspective view of a branch of a phase winding in a stator assembly according to an embodiment of the present invention is shown.

[0033] Figure 4 A schematic diagram of the three-phase, three-path parallel connection of the stator winding of the present invention is shown.

[0034] Figure 5 A schematic diagram of the stator winding layout of the present invention is shown.

[0035] Figure 6 The U-phase unfolded design diagram of the stator winding of the present invention is shown.

[0036] Figure 7 The diagram shows the V-phase unfolded design of the stator winding of the present invention.

[0037] Figure 8 The W-phase unfolded design diagram of the stator winding of the present invention is shown.

[0038] Figure 9 The U-phase unfolded design of the stator winding of the present invention is shown in another form.

[0039] All accompanying drawings are schematic only and are not necessarily drawn to scale. Furthermore, they only show those parts necessary to illustrate the invention; other parts are omitted or merely mentioned. That is, the invention may include other parts besides those shown in the drawings.

[0040] In the accompanying drawings, the same and / or functionally identical technical features are represented by the same or similar reference numerals. Detailed Implementation

[0041] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the invention. However, it will be apparent to those skilled in the art that implementations of the invention may not include some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, the invention can be conceived to be practiced with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as features or limitations of the claims unless expressly set forth in the claims.

[0042] The descriptions of orientation used in the following description, such as “upper,” “lower,” “inner,” “outer,” “radial,” and “axial,” are merely for convenience of description and are not intended to limit the technical solution of the invention unless explicitly stated otherwise. Furthermore, the terms “first,” “second,” and other similar terms used below to describe elements of this application are only used to distinguish individual elements and are not intended to limit the nature, sequence, order, or number of these elements.

[0043] Figure 1 A perspective view of a stator winding according to an embodiment of the present invention is shown. Figure 1 As can be seen, the stator winding 100 has a cylindrical structure, thus defining an axis. At one end of this axis is the first end 10, where all the individual conductor elements forming the stator winding 100 are connected by welding; therefore, the first end 10 can also be called the welded end. At the other end of this axis is the second end 30, which includes the connection of the two legs of the U-pin in the conductor element used; depending on its shape, it can also be called the crown end or the rostrum end. Located between the first end 10 and the second end 30 in the axial direction is the intermediate portion. In the manufactured stator, the first end 10 and the second end 30 of the entire stator winding 100 are located axially outside the stator core, while the intermediate portion is accommodated within the stator slots.

[0044] To connect the stator windings to other components such as the inverter, the stator windings also have leads 40. Leads 40 include multiple leads that are connected to the inverter via a busbar to receive three-phase alternating power to generate an alternating magnetic field in the stator, thereby causing the rotor located inside the stator to rotate.

[0045] As one aspect of the present invention, such as Figure 1 As shown, all leads of the stator winding 100 at the lead-out terminal 40 are located on the outermost radial side of the stator winding.

[0046] Figure 2 A perspective view of two U-pins connected together is shown. The first U-pin U1 has two straight sections U12, a connecting section U11 connecting the two straight sections U12, and bent sections U13 corresponding to each of the two straight sections U12. The second U-pin U2 has two straight sections U22, a connecting section U21 connecting the two straight sections U22, and bent sections U23 corresponding to each of the two straight sections U22. The two U-pins connected to each other are fixedly connected by stacking the bent sections and then welding them together.

[0047] In this invention, the two straight sections of the same U-pin are located in different tooth grooves and can be located in different layers. Therefore, the connecting part needs to be processed to shape the U-pin into a suitable form. The connecting part can be formed by molding, while the bending part can be formed by twisting.

[0048] Once the U-pin is installed into the stator according to the predetermined connection method and soldered, a connection is formed. Figure 1 The stator winding 100 is shown. In addition, in order to form an output lead at the second end, a certain number of I-pins and U-pins are soldered together.

[0049] For stator windings, if a 4 / 6 / 8 / 10-layer design with 1 or 2 parallel windings is used, the number of winding turns is relatively high, making it difficult to increase the high-speed power of the motor. Therefore, this invention proposes a stator winding scheme based on 3 parallel windings. Figure 3 A perspective view of a branch of a phase winding in a stator assembly according to an embodiment of the present invention is shown.

[0050] Specifically, for the three-phase parallel scheme, for the three-phase windings containing U phase, V phase and W phase, the structure of each phase is the same, and there is a 120° phase difference between each phase winding.

[0051] Figure 4 A schematic diagram of the three-phase, three-way parallel connection of the stator windings of the present invention is shown. Figure 4 It can be seen that for phases U, V, and W, each phase includes three branches connected in parallel. Taking phase U as an example, each branch includes incoming terminals U1in, U2in, and U3in, and outgoing terminals U1out, U2out, and U3out. Between the incoming and outgoing terminals of each branch are multiple, for example... Figure 3 The conductor elements shown are connected to each other in sequence. As mentioned earlier, the winding design is a key aspect of flat wire motors. Different winding designs affect the motor's electrical performance, the specifications and number of conductor elements, the manufacturing process, and the manufacturing process of the busbars connected to the windings.

[0052] Therefore, this application proposes the following winding design. Since there is a correspondence between the three phases, the following explanation uses the U-phase winding as an example, showing the position of each conductor element in each branch and their interconnections. Specifically, for the position of each conductor element, m(n) represents its position in the stator slot, where m represents the slot number and n represents the layer number within a slot. For this application, the proposed stator winding is for a stator with 54 slots, and each slot has 6 layers. The layer numbers increase sequentially from the inside out within the slot; that is, within each slot, the deepest layer is layer number 1 (or the layer farthest from the axis of the cylindrical structure of the stator winding 100 is layer 1), while the outermost layer, or the layer closest to the rotor, is layer number 6 (or the layer closest to the axis is layer 6).

[0053] According to the above rules, a specific example of a winding design proposed in this application is as follows.

[0054] For the first branch, the positions and specific connections of its conductor elements are as follows:

[0055] U1_in→

[0056] 1(1)→10(2)→20(1)→29(2)→36(1)→45(2)→

[0057] 54(3)→9(4)→19(3)→28(4)→38(3)→47(4)→

[0058] 2(5)→11(6)→21(5)→30(6)→37(5)→46(6)→

[0059] 3(6)→48(5)→38(6)→29(5)→19(6)→10(5)→

[0060] 1(4)→46(3)→36(4)→27(3)→20(4)→11(3)→

[0061] 2(2)→47(1)→37(2)→28(1)→18(2)→9(1)→

[0062] U1_out.

[0063] Since the slot numbering is relative, the numbering of the same slot can vary, as long as the slot numbers of all slots in the entire stator are consecutive. Therefore, the positions of the conductor elements in the U-phase stator winding described above are merely an example. Based on the above example, it can be seen that the core principle of the first branch of the stator winding proposed in this invention is:

[0064] (1) The first branch includes 6 winding cycles. In each winding cycle, the conductor element in the winding is located in 6 slots. In the first 3 cycles, the layer where the conductor element is located changes sequentially between the 2i-1 layer and the 2i layer, where i is the cycle number. In the last 3 cycles, the layer where the conductor element is located changes sequentially between the 14-2i layer and the 13-2i layer.

[0065] (2) In the first three cycles, the winding changes along the first direction within the slots, while in the last three cycles, the winding changes along the second direction, which is opposite to the first direction. That is, since the 54 slots are arranged circumferentially, in the first three cycles, the position of the conductor element within the slots changes according to the direction 1-54, while in the last three cycles, the position of the conductor element within the slots changes according to the direction 54-1. Since the stator is cylindrical in shape, the first and second directions correspond to clockwise and counterclockwise, respectively, or, depending on the numbering method, the first and second directions correspond to counterclockwise and clockwise, respectively.

[0066] (3) Since each cycle includes the position of the conductor element within 6 slots, the number of slots between two adjacent conductor elements is defined as the span. Therefore, each of the 6 cycles contains 5 spans, and the values ​​of the first 3 spans and the 5th span are the same across all 6 cycles, differing only in the value of the 4th span. Furthermore, the values ​​of the first 3 spans and the 5th span are 9, 10, 9, and 9, respectively. In these 6 cycles, the values ​​of the 4th span are 7, 10, 7, 10, 7, and 10, respectively.

[0067] (4) In these 6 cycles, when changing from one cycle to the next, the span is 9-9-11-9-9.

[0068] (5) In these 6 cycles, the span variation pattern is the same for cycles with odd-numbered cycles and the span variation pattern is the same for cycles with even-numbered cycles. Furthermore, the spans in each cycle are 9-10-9-7-9, 9-10-9-10-9, 9-10-9-7-9, 9-10-9-10-9, 9-10-9-7-9, and 9-10-9-10-9.

[0069] The following describes the winding method when the conductor element is implemented as a combination of U-pin and I-pin, taking the first winding cycle of the first branch as an example. One end of the I-pin is formed as the lead-out end 40 of the inlet end U1in, and its straight portion is located in the first layer of the tooth slot 1 (hereinafter referred to as located at 1(1)) so that the I-pin extends from the second end 30 of the stator winding 100 to the first end 10, and is welded to the bent portion of the first U-pin at the first end 10. The two straight portions of the first U-pin are located at 10(2) and 20(1) respectively, and the span of their connection portion is 10; the two straight portions of the second U-pin are located at 29(2) and 36(1) respectively, and the span of their connection portion is 7; the two straight portions of the third U-pin are located at 45(2) and 54(3) respectively, and the span of their connection portion is 9. The first to third U-pins are formed as follows: Figure 2 The conductors are connected sequentially as shown, so that the span formed by the two conductors welded together at the first end 10 is a specific value of 9. Thus, the I-pin is connected in series with the first to third U-pins, forming the first winding cycle with a span of 9-10-9-7-9. It should be noted that in the six winding cycles of each branch, the first and sixth cycles forming the input terminal U1in and the output terminal U1out require the use of the I-pin; other cycles can use only the U-pin.

[0070] For the second branch, the positions and specific connections of its conductor elements are as follows:

[0071] U2_in→

[0072] 54(1)→9(2)→19(1)→28(2)→38(1)→47(2)→

[0073] 2(3)→11(4)→18(3)→27(4)→37(3)→46(4)→

[0074] 1(5)→10(6)→20(5)→29(6)→39(5)→48(6)→

[0075] 2(6)→47(5)→37(6)→28(5)→21(6)→12(5)→

[0076] 54(4)→45(3)→38(4)→29(3)→19(4)→10(3)→

[0077] 1(2)→46(1)→36(2)→27(1)→20(2)→11(1)→

[0078] U2_out.

[0079] The core principle of the second branch of the stator winding proposed in this invention is as follows:

[0080] (1) The second branch includes 6 winding cycles. In each winding cycle, the conductor element in the winding is located in 6 slots. In the first 3 cycles, the layer where the conductor element is located changes sequentially between the 2i-1 layer and the 2i layer, where i is the cycle number. In the last 3 cycles, the layer where the conductor element is located changes sequentially between the 14-2i layer and the 13-2i layer.

[0081] (2) In the first three cycles, the winding changes along the first direction within the slots, while in the last three cycles, the winding changes along the second direction, which is opposite to the first direction. That is, since the 54 slots are arranged circumferentially, in the first three cycles, the position of the conductor element within the slots changes according to the direction 1-54, while in the last three cycles, the position of the conductor element within the slots changes according to the direction 54-1. Since the stator is cylindrical in shape, the first and second directions correspond to clockwise and counterclockwise, respectively, or, depending on the numbering method, the first and second directions correspond to counterclockwise and clockwise, respectively.

[0082] (3) Since each cycle contains the position of the conductor element in 6 slots, the number of slots between two adjacent conductor elements is defined as the span. Therefore, in all 6 cycles, each cycle contains 5 spans, and the values ​​of the 1st, 3rd, and 5th spans are the same in all 6 cycles. Specifically, they are all 9.

[0083] Furthermore, the spans within each cycle are 9-10-9-10-9, 9-7-9-10-9, 9-10-9-10-9, 9-10-9-7-9, 9-7-9-10-9, and 9-10-9-7-9.

[0084] (4) In these 6 cycles, when changing from one cycle to the next, the span is 9-9-8-12-9 in sequence.

[0085] For the third branch, the positions and specific connections of its conductor elements are as follows:

[0086] U3_in→

[0087] 2(1)→11(2)→18(1)→27(2)→37(1)→46(2)→

[0088] 1(3)→10(4)→20(3)→29(4)→36(3)→45(4)→

[0089] 3(5)→12(6)→19(5)→28(6)→38(5)→47(6)→

[0090] 1(6)→46(5)→39(6)→30(5)→20(6)→11(5)→

[0091] 2(4)→47(3)→37(4)→28(3)→18(4)→9(3)→

[0092] 54(2)→45(1)→38(2)→29(1)→19(2)→10(1)→

[0093] U3_out.

[0094] The core principle of the third branch of the stator winding proposed in this invention is as follows:

[0095] (1) The third branch includes 6 winding cycles. In each winding cycle, the conductor element in the winding is located in 6 slots. In the first 3 cycles, the layer where the conductor element is located changes sequentially between the 2i-1 layer and the 2i layer, where i is the cycle number. In the last 3 cycles, the layer where the conductor element is located changes sequentially between the 14-2i layer and the 13-2i layer.

[0096] (2) In the first three cycles, the winding changes along the first direction within the slots, while in the last three cycles, the winding changes along the second direction, which is opposite to the first direction. That is, since the 54 slots are arranged circumferentially, in the first three cycles, the position of the conductor element within the slots changes according to the direction 1-54, while in the last three cycles, the position of the conductor element within the slots changes according to the direction 54-1. Since the stator is cylindrical in shape, the first and second directions correspond to clockwise and counterclockwise, respectively, or, depending on the numbering method, the first and second directions correspond to counterclockwise and clockwise, respectively.

[0097] (3) Since each cycle contains the position of the conductor element in 6 slots, the number of slots between two adjacent conductor elements is defined as the span. Therefore, in all 6 cycles, each cycle contains 5 spans, and the values ​​of the 1st, 3rd, and 5th spans are the same in all 6 cycles. Specifically, they are all 9.

[0098] Furthermore, the spans within each cycle are 9-7-9-10-9, 9-10-9-7-9, 9-7-9-10-9, 9-7-9-10-9, 9-10-9-10-9, and 9-7-9-10-9.

[0099] (4) In these 6 cycles, when changing from one cycle to the next, the span is 9-12-8-9-9 in sequence.

[0100] As illustrated. Figure 5 This diagram shows the unfolded design of the stator winding of the present invention. Figure 6 This diagram shows the U-phase unfolded design of the stator winding of the present invention. Figure 7 This diagram shows the V-phase unfolded design of the stator winding of the present invention. Figure 8 The W-phase unfolded design diagram of the stator winding of the present invention is shown.

[0101] As shown above, for the entire winding, span 9 appears most frequently, followed by 7 and 10. Spans 8, 11, and 12 appear less frequently. For the entire winding, this means that only 6 different conductor elements need to be manufactured to form the entire winding. This reduces the complexity of the stator winding manufacturing process. At the same time, the simplicity and uniformity of the jumper types also reduce the complexity of the overmolding process, decreasing the costs of copper wire bending and injection molding.

[0102] Furthermore, for the windings of this invention, both the input and output ends are on the same side and are located in the first layer near the radial outer side of the stator winding. The winding method of this invention also results in the input and output ends being arranged regularly and relatively concentrated in the circumferential direction (e.g., ...). Figure 1 As shown in the figure, this simplifies the structural design of the busbar and makes the connection structure between the busbar and the stator winding simpler.

[0103] In addition to manufacturing advantages, the stator winding of this invention also offers advantages in electrical performance. Specifically, due to its short-pitch design, the stator winding of this invention can reduce the motor's NVH (noise, vibration, and harshness) and decrease the design costs for subsequent NVH optimization. Furthermore, the winding design helps to eliminate intra-phase circulating currents.

[0104] Figure 9 The U-phase unfolded design diagram of the stator winding of the present invention is shown in another form. From Figure 9 As can be seen, the stator winding of the present invention is designed as a short-pitch winding, which can reduce the coil span, weaken the high-order harmonic components, and reduce leakage flux and electromagnetic noise.

[0105] Furthermore, from Figure 9 As can be seen, within the same phase, the conductors of the same branch are designed to occupy symmetrical slots at opposite poles. For example, the first branch of phase U (shown in dark blue in the figure) has the same arrangement at poles 1 and 4, the same arrangement at poles 2 and 5, and the same arrangement at poles 3 and 6; similarly, the second branch (shown in light blue in the figure) and the third branch (shown in green in the figure) also have the same arrangement.

[0106] Furthermore, as can be seen from the figure, this application relates to a stator with 6 magnetic poles and 54 slots.

[0107] As can be seen from the above, in the winding connection method according to the present invention, the span after the winding enters includes 7, 8, 9, 10, 11, and 12; and the crossing method of the winding in each winding cycle includes spans of 7, 9, and 10, while the crossing method between two adjacent winding cycles includes spans of 8, 9, 11, and 12. Specifically, the crossing between layers meets the following conditions:

[0108] Crossing methods between layers 1 and 2 (including from layer 1 to layer 2 and from layer 2 to layer 1) include: crossing 7, 9, and 10;

[0109] There is one way to cross between the 2nd and 3rd floors (including from the 2nd floor to the 3rd floor and from the 3rd floor to the 2nd floor): cross 9;

[0110] Crossing routes between the 3rd and 4th floors (including from the 3rd floor to the 4th floor and from the 4th floor to the 3rd floor) include crossing the 7th, 9th, and 10th floors;

[0111] Crossing routes between the 4th and 5th floors (including from the 4th floor to the 5th floor and from the 5th floor to the 4th floor) include: crossing 9 and 12;

[0112] Crossing routes between the 5th and 6th floors (including from the 5th floor to the 6th floor and from the 6th floor to the 5th floor) include crossing the 7th, 9th, and 10th floors;

[0113] Self-crossing methods between layers 6 include: crossing layers 8 and 11.

[0114] After the incoming wires are connected, the entire single-phase winding follows this pattern, crossing the wires for 6 turns before exiting the winding.

[0115] The motor with the stator winding of this application can be used in various types of electric vehicles. For example, it can be used in pure electric vehicles that are powered solely by batteries, or in hybrid vehicles that include other types of power sources besides the motor.

[0116] The present invention has been clearly and completely described with reference to the illustrative embodiments above. Those skilled in the art should understand that various other embodiments can be conceived through modifications to the disclosed technical solutions without departing from the spirit and scope of the invention. These embodiments should be understood to fall within the scope of the present invention as defined by the claims and any equivalent technical solutions.

Claims

1. A stator assembly, comprising: A stator core having a plurality of stator teeth and stator slots formed between the stator teeth, the stator core defining an axis; The stator winding, a portion of which is located within the stator slots, is made of multiple conductor elements with rectangular cross-sections. Six layers of conductor elements are arranged within each slot. The stator winding includes U-phase, V-phase, and W-phase windings, with each phase winding having the same winding method. The layer furthest from the axis is layer 1, and the layer closest to the axis is layer 6. The other layers are arranged sequentially between layers 1 and 6. Its features are, Each phase winding has three parallel branches, and for each phase winding, the input and output terminals are located on the first layer.

2. The stator assembly according to claim 1, characterized in that, For each branch of each phase winding, there are 6 winding cycles; within each winding cycle, the conductor element of the branch is located in 6 stator slots, and the conductor element located in the 6 stator slots has 5 spans, of which the 1st, 3rd and 5th spans are all 9.

3. The stator assembly according to claim 2, characterized in that, For each branch of each phase winding, in the first 3 cycles, the layer where the conductor element is located changes sequentially between layer 2i-1 and layer 2i, where i is the cycle number. In the last 3 cycles, the layer where the conductor element is located changes sequentially between layer 14-2i and layer 13-2i.

4. The stator assembly according to claim 2, characterized in that, For each branch of each phase winding, in the first 3 cycles, the windings are connected sequentially in the slots along the first direction, and in the last 3 cycles, the windings are connected sequentially in the slots along the second direction opposite to the first direction.

5. The stator assembly according to any one of claims 2-4, characterized in that, For the first branch, in the 6 cycles, the span variation pattern is the same for cycles with odd-numbered cycles and the span variation pattern is the same for cycles with even-numbered cycles. The spans in each cycle are 9-10-9-7-9, 9-10-9-10-9, 9-10-9-7-9, 9-10-9-10-9, 9-10-9-7-9, and 9-10-9-10-9; and / or When changing from one cycle to the next, the span is 9-9-11-9-9.

6. The stator assembly according to any one of claims 2-4, characterized in that, For the second branch, the spans in each cycle are 9-10-9-10-9, 9-7-9-10-9, 9-10-9-10-9, 9-10-9-7-9, 9-7-9-10-9, and 9-10-9-7-9; and / or When changing from one cycle to the next, the span is 9-9-8-12-9.

7. The stator assembly according to any one of claims 2-4, characterized in that, For the third branch, the spans in each cycle are 9-7-9-10-9, 9-10-9-7-9, 9-7-9-10-9, 9-7-9-10-9, 9-10-9-10-9, and 9-7-9-10-9; and / or When changing from one cycle to the next, the span is 9-12-8-9-9.

8. The stator assembly according to any one of claims 1-7, characterized in that, The stator windings can cross over each other in two ways between the 6th layers: crossing 8 and crossing 11. The crossing methods between layers 1 and 2, between layers 3 and 4, and between layers 5 and 6 all include crossing layers 7, 9, and 10; There is one way to cross lines between the 2nd and 3rd floors: cross 9; Crossing methods between layers 4 and 5 include: crossing layers 9 and 12; Each phase winding, after entering the line, follows this pattern, crossing the line 6 times before exiting the line.

9. The stator assembly according to any one of claims 2-4, characterized in that, The stator winding crossover pattern within each winding cycle includes crossings 7, 9, and 10, and the crossover pattern between two adjacent winding cycles includes crossings 8, 9, 11, and 12.

10. An electric motor comprising a rotor assembly and a stator assembly according to any one of claims 1-9.

11. An electric drive system, comprising at least one of a reducer and an inverter, characterized in that, It also includes the motor according to claim 10.

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