A motor stator, a manufacturing method of the motor stator, and a hairpin motor

Abstract

The present application discloses a motor stator, a manufacturing method of the motor stator, and a hairpin motor. In the motor stator, the independent circuits constituting the first-phase winding, the second-phase winding, and the third-phase winding are respectively and sequentially arranged in a staggered manner in three adjacent continuous winding slots. Each independent circuit is formed by alternately connecting winding coils with a span of (1 + 3m) winding slots, where m is a positive integer; three adjacent winding slots with a span of (1 + 3m) winding slots constituting an independent circuit contain a repeated winding unit, and the repeated winding unit is formed by 2 times of lap winding + 1 time of wave winding + 2 times of lap winding in these three adjacent winding slots. By setting the number of conductors in each winding slot to an odd number of layers, the present application has a simple winding method, increases the adjustability of the number of winding turns, balances power and torque during motor design, simplifies the slip ring, and reduces the lead-out height.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of motors, and in particular, to a motor stator, a manufacturing method of the motor stator, and a hairpin motor. Background Art

[0002] The stator winding includes a plurality of hairpin coils. The plurality of hairpin coils are inserted into the slots of the stator core according to a certain arrangement manner to form the windings of the required single-phase motor or polyphase motor.

[0003] Currently, when designing existing vehicle hairpin motors, the number of conductors per slot in the motor stator is basically designed with an even number of layers. With the increasing requirement for power density and the continuous increase of the input current of the controller, in order to reduce the problems of skin effect of the winding, copper loss, and increased heating caused by the increase in current, the number of winding layers has gradually increased. Since the hairpin motor windings are all made of a single copper bar U-shaped wire, different from the round wire windings of traditional motors, the number of turns cannot be freely adjusted. And for ease of manufacturing, the number of winding layers has increased from 2 layers and 4 layers to the current 6 layers and 8 layers during design.

[0004] The increase in the number of conductor layers can effectively solve the influence brought by the increase in the input current of the controller. However, the increase in the number of winding conductors will increase the motor inductance, resulting in a decrease in the exciting current, reducing the torque and power of the motor, and may lead to the situation where the torque and power cannot be satisfied simultaneously during motor design. Summary of the Invention

[0005] The purpose of the invention is to provide a motor stator, a manufacturing method of the motor stator, and a hairpin motor. The number of conductors per slot is set to an odd number of layers, which can effectively solve the technical problem that when the current number of winding layers is even, the increase in the number of winding conductors will increase the motor inductance, resulting in a decrease in the exciting current, reducing the torque and power of the motor, and may lead to the situation where the torque and power cannot be satisfied simultaneously during motor design.

[0006] To achieve the above object, in one embodiment of the present invention, a motor stator is provided, which includes a stator winding and an integral stator core; a plurality of slot grooves extending along its own axial direction are evenly spaced on the inner side of the stator core, wherein the stator core divides each of the slot grooves into n layers along the radial direction and away from the axis, n≥5, and n is an odd number; the total number of the slot grooves is an even number; the stator winding is arranged in the slot grooves, and the stator winding includes a first-phase winding, a second-phase winding and a third-phase winding, and the first-phase winding, the second-phase winding and the third-phase winding are each an independent loop; the independent loops constituting the first-phase winding, the second-phase winding and the third-phase winding are respectively and sequentially arranged in a staggered manner in three adjacent consecutive slot grooves, and each independent loop is formed by alternately connecting winding coils with a span of (1 + 3m) slot grooves, where m is a positive integer; the three adjacent slot grooves with a span of (1 + 3m) slot grooves forming an independent loop contain a repeated winding unit, and the repeated winding unit sequentially passes through the first layer of the first slot groove, the first layer of the second slot groove, the second layer of the first slot groove, the third layer of the second slot groove, the fourth layer of the first slot groove, the fifth layer of the first slot groove, the fifth layer of the third slot groove, the fourth layer of the second slot groove, the third layer of the third slot groove, the second layer of the second slot groove, the first layer of the third slot groove, and the first layer of the first slot groove of the next repeated winding unit is connected to the first layer of the first slot groove of the next repeated winding unit, and so on to form each independent loop by repeated winding. (The repeated winding unit undergoes 2 times of lap winding + 1 time of wave winding + 2 times of lap winding in these three adjacent slot grooves).

[0007] For the motor stator described in an embodiment of the present application, wherein the first-phase winding is arranged in slot grooves spaced (1 + 3m) apart from each other, the second-phase winding is arranged adjacent to the first-phase winding, and the third-phase winding is arranged adjacent to the second-phase winding.

[0008] For the motor stator described in an embodiment of the present application, wherein m is 2, and the independent loops formed by the first-phase winding, the second-phase winding and the third-phase winding are respectively formed by alternately connecting winding coils with a span of 7 slot grooves.

[0009] For the motor stator described in an embodiment of the present application, wherein the total number of the slot grooves is 36, 48, 60, 72 or 96.

[0010] For the motor stator described in an embodiment of the present application, wherein one end face side of the stator core is a winding hairpin end, and the other end face side is a winding connection end; the input terminals and output terminals of the first-phase winding, the second-phase winding and the third-phase winding are all distributed on the winding hairpin end.

[0011] The motor stator described in an embodiment of the present application, wherein the wiring terminals are connected to the slip rings through three-phase lines, and the slip rings are connected to a corresponding independent circuit to form the input terminals.

[0012] The present application also provides a hairpin motor, which includes the motor stator described throughout the text and a rotor coaxially arranged inside the motor stator.

[0013] The present application also provides a manufacturing method of the motor stator described above, including the steps of:

[0014] Step of manufacturing the stator core: Manufacture a stator core, and a plurality of winding grooves extending along its own axial direction are evenly spaced on the inner side of the stator core. The stator core divides each of the winding grooves into n layers along the radial direction and away from the axis, where n≥5 and n is an odd number; the total number of the winding grooves is an even number;

[0015] Step of winding the independent circuit: Fix the starting end of the winding coil in one of the winding grooves, and the winding coil winds alternately in winding grooves with a span of (1 + 3m) winding grooves, where m is a positive integer; in three adjacent winding grooves with a span of (1 + 3m) winding grooves, there is a repeated winding unit. The repeated winding unit sequentially passes through the first layer of the first winding groove, the first layer of the second winding groove, the second layer of the first winding groove, the third layer of the second winding groove, the fourth layer of the first winding groove, the fifth layer of the first winding groove, the fifth layer of the third winding groove, the fourth layer of the second winding groove, the third layer of the third winding groove, the second layer of the second winding groove, the first layer of the third winding groove, and the first layer of the first winding groove of the next repeated winding unit connected to the third winding groove. Repeat the winding in this way to form each independent circuit; and

[0016] Step of manufacturing the stator winding: Repeat the step of winding the independent circuit in the winding grooves until all winding is completed. The stator winding includes a first-phase winding, a second-phase winding, and a third-phase winding, and the first-phase winding, the second-phase winding, and the third-phase winding are each an independent circuit; the independent circuits arranged in sequence and misaligned in three adjacent consecutive winding grooves sequentially form the first-phase winding, the second-phase winding, and the third-phase winding.

[0017] In the manufacturing method of the motor stator described in an embodiment of the present application, the first-phase winding is arranged in winding grooves spaced (1 + 3m) apart from each other, the second-phase winding is arranged adjacent to the first-phase winding, and the third-phase winding is arranged adjacent to the second-phase winding.

[0018] The manufacturing method of the motor stator described in an embodiment of the present application, where m is 2, and the independent circuits formed by the first-phase winding, the second-phase winding, and the third-phase winding are respectively formed by alternately connecting winding coils with a span of 7 winding slots; and / or, the total number of the winding slots is 36, 48, 60, 72, or 96.

[0019] The beneficial effects of the present invention are as follows: A motor stator, a manufacturing method of a motor stator, and a hairpin motor are provided. By setting the number of conductors in each winding slot to an odd number of layers, the winding method is simple, the adjustability of the number of winding turns is increased, the power and torque are balanced during motor design, the slip ring is simplified, and the wire outlet height is reduced. It can effectively solve the technical problem that when the current number of winding layers is an even number, the increase in the number of winding conductors will increase the inductance of the motor, resulting in a decrease in the exciting current, a decrease in the torque and power of the motor, and the possibility that the torque and power cannot be simultaneously satisfied during motor design. Description of the Drawings

[0020] The following combines the drawings and details the specific implementation manners of the present application to present the technical solutions and other beneficial effects of the present application.

[0021] Figure 1 It is a schematic structural diagram of a hairpin motor provided by the present application.

[0022] Figure 2 It is a schematic diagram of an independent circuit structure of the motor stator provided by the present application.

[0023] Figure 3 It is a distribution schematic diagram of an independent circuit of an 8-pole 48-slot 5-layer double-Y winding provided by the present application.

[0024] Figure 4 It is a winding cycle schematic diagram of a repeated winding unit of an 8-pole 48-slot 5-layer double-Y winding provided by the present application.

[0025] Figure 5 It is a linear structure schematic diagram of an 8-pole 48-slot 5-layer double-Y winding provided by the present application.

[0026] Figure 6 It is a flowchart of a manufacturing method of a motor stator provided by the present application. Detailed Description of the Embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0029] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0030] Specifically, please refer to Figures 1 to 5 , the embodiment of the present application provides a hairpin motor 100, which includes a motor stator 10 and a rotor (not shown), and the rotor is coaxially arranged inside the motor stator 10.

[0031] Please refer to Figures 1 to 5, the motor stator 10 has a 2Y winding connection structure, including a stator winding 2 and an integral stator core 1; a plurality of slot ducts 11 extending along its own axial direction are evenly spaced inside the stator core 1, wherein the stator core 1 divides each of the slot ducts 11 into a first layer, a second layer, ……, an nth layer along the radial direction and away from the axis, n≥5 and n is an odd number; the total number of the slot ducts 11 is an even number; the stator winding 2 is arranged in the slot ducts 11, and the stator winding 2 includes a first-phase winding, a second-phase winding and a third-phase winding, and the first-phase winding, the second-phase winding and the third-phase winding are all independent circuits respectively; the independent circuits constituting the first-phase winding, the second-phase winding and the third-phase winding are respectively and sequentially arranged in adjacent three consecutive slot ducts 11 in a staggered manner, and each independent circuit is formed by alternately connecting winding coils with a span of (1 + 3m) slot ducts, where m is a positive integer; the adjacent three slot ducts 11 with a span of (1 + 3m) slot ducts constituting an independent circuit contain a repeated winding unit, and the repeated winding unit sequentially passes through the first layer of the first slot duct, the first layer of the second slot duct, the second layer of the first slot duct, the third layer of the second slot duct, the fourth layer of the first slot duct, the fifth layer of the first slot duct, the fifth layer of the third slot duct, the fourth layer of the second slot duct, the third layer of the third slot duct, the second layer of the second slot duct, the first layer of the third slot duct, and the first layer of the third slot duct is connected to the first layer of the first slot duct of the next repeated winding unit, and so on to form each independent circuit by repeated winding. Therefore, lap winding is adopted for the first to fifth layers of the first slot duct, lap winding is adopted for the first to fifth layers of the second slot duct, wave winding with same-layer cross-wiring is adopted between the layer of the first slot duct and the fifth layer of the second slot duct, and wave winding with same-layer cross-wiring is adopted between the first layer of the third slot duct and the first layer of the first slot duct of the next repeated winding unit. Lap winding is a type of winding pattern, and wave winding is a type of winding pattern. Thus, each repeated winding unit is formed by 2 times of lap winding + 1 time of wave winding + 2 times of lap winding in these adjacent three slot ducts 11, so that the winding method is simple, the adjustability of the number of winding turns is increased, the power and torque are balanced during motor design, the slip ring is simplified, and the outgoing line height is reduced.

[0032] Please refer to Figures 3 to 5, in the embodiment of the present application, the first-phase winding is arranged in the 1st slot, the 1+(1 + 3m)th slot, the 1+2(1 + 3m)th slot, ……, the 1+k(1 + 3m)th slot, the second-phase winding is arranged in the 2nd slot, the 2+(1 + 3m)th slot, the 2+2(1 + 3m)th slot, ……, the 2+k(1 + 3m)th slot, and the third-phase winding is arranged in the 3rd slot, the 3+(1 + 3m)th slot, the 3+2(1 + 3m)th slot, ……, the 3+k(1 + 3m)th slot, where k is a positive integer and m is a positive integer. The first-phase winding, the second-phase winding, and the third-phase winding are arranged adjacent to each other in sequence.

[0033] , in the embodiment of the present application, the total number of the slots 11 is 36, 48, 60, 72 or 96. Preferably, the total number of the slots 11 is 48 and n = 5, so that the slots 11 include 5 layers, and each phase winding of the motor stator 10 is an 8-pole 48-slot 5-layer double-Y winding.

[0034] Please refer to Figure 3 , in the embodiment of the present application, m = 2, and the independent loops formed by the first-phase winding, the second-phase winding, and the third-phase winding are respectively formed by alternately connecting winding coils with a span of 7 slots 11. Thus, the first-phase winding is arranged in the 1st, 7th, 13th, 19th, 25th, 31st, 37th, 43rd slots 11, the second-phase winding is arranged in the 2nd, 8th, 14th, 20th, 26th, 32nd, 38th, 44th slots 11, and the third-phase winding is arranged in the 3rd, 9th, 15th, 21st, 27th, 33rd, 39th, 45th slots 11. Since each independent loop is formed by alternately connecting winding coils with a span of (1 + 3m) slots, the first-phase winding, the second-phase winding, and the third-phase winding arranged alternately and misaligned are respectively arranged in the slots increased by 3(m - 1). The first-phase winding is arranged in the slots of 1+3(m - 1), that is, the first-phase winding is arranged in the 4th, 10th, 16th, 22nd, 28th, 34th, 40th, 46th slots 11, the second-phase winding is arranged in the 5th, 11th, 17th, 23rd, 29th, 35th, 41st, 47th slots 11, and the third-phase winding is arranged in the 6th, 12th, 18th, 24th, 30th, 36th, 42nd, 48th slots 11.

[0035] Please refer to Figure 1 , Figure 2 , in the embodiment of the present application, one end face side of the stator core 1 is the winding hairpin end, and the other end face side is the winding connection end; the input terminals and output terminals of the first-phase winding, the second-phase winding, and the third-phase winding are all distributed at the winding hairpin end.

[0036] Please refer to Figure 1 , in the embodiment of the present application, the terminal block 5 is connected to the slip ring 3 through the three-phase line 4, and the slip ring 3 is connected to a corresponding independent loop to form the input terminal.

[0037] Please refer to Figure 6 , the present application also provides a manufacturing method of the motor stator 10 described above, including steps S1 - S3:

[0038] S1. Step of manufacturing the stator core, manufacturing a stator core 1, a plurality of slot ducts 11 extending along its own axial direction are evenly spaced on the inner side of the stator core 1, wherein the stator core 1 divides each of the slot ducts 11 into the first layer, the second layer,..., the nth layer along the radial direction and away from the axis direction, n≥5, and n is an odd number; the total number of the slot ducts 11 is an even number;

[0039] S2. Step of winding the independent loop, fixing the starting end of the winding coil in one of the slot ducts 11, and the winding coil winds alternately in the slot ducts with a span of (1 + 3m) slot ducts, where m is a positive integer; in the adjacent three slot ducts 11 with a span of (1 + 3m) slot ducts, it contains a repeated winding unit, and the repeated winding unit sequentially passes through the first layer of the first slot duct, the first layer of the second slot duct, the second layer of the first slot duct, the third layer of the second slot duct, the fourth layer of the first slot duct, the fifth layer of the first slot duct, the fifth layer of the third slot duct, the fourth layer of the second slot duct, the third layer of the third slot duct, the second layer of the second slot duct, the first layer of the third slot duct, and the first layer of the first slot duct of the next repeated winding unit is connected to the first layer of the first slot duct of the next repeated winding unit, and winding is repeated in this way to form each independent loop; and

[0040] S3. Step of manufacturing the stator winding, repeating the step of winding the independent loop in the slot ducts 11 until all winding is completed, wherein the stator winding 2 includes a first-phase winding, a second-phase winding, and a third-phase winding, and the first-phase winding, the second-phase winding, and the third-phase winding are each an independent loop; the independent loops arranged in sequence and offset in adjacent consecutive three slot ducts 11 form the first-phase winding, the second-phase winding, and the third-phase winding respectively.

[0041] In the embodiment of the present application, the first-phase winding is arranged in the 1st winding slot, the 1+(1+3m)th winding slot, the 1+2(1+3m)th winding slot, ……, the 1+k(1+3m)th winding slot, the second-phase winding is arranged in the 2nd winding slot, the 2+(1+3m)th winding slot, the 2+2(1+3m)th winding slot, ……, the 2+k(1+3m)th winding slot, and the third-phase winding is arranged in the 3rd winding slot, the 3+(1+3m)th winding slot, the 3+2(1+3m)th winding slot, ……, the 3+k(1+3m)th winding slot, where k is a positive integer and m is a positive integer.

[0042] In the embodiment of the present application, m is 2, and the independent loops formed by the first-phase winding, the second-phase winding, and the third-phase winding are respectively formed by alternately connecting winding coils with a span of 7 winding slots 11; and / or, the total number of the winding slots 11 is 36, 48, 60, 72, or 96. Preferably, the total number of the winding slots 11 is 48, and n = 5, so that the winding slots 11 include 5 layers, and each phase winding of the motor stator 10 is an 8-pole 48-slot 5-layer double-Y winding.

[0043] The beneficial effects of the present invention are as follows: A motor stator, a manufacturing method of the motor stator, and a hairpin motor are provided. By setting the number of conductors in each winding slot to an odd number of layers, the winding method is simple, the adjustability of the number of winding turns is increased, the power and torque in motor design are balanced, the slip ring is simplified, and the wire outlet height is reduced. It can effectively solve the technical problem that when the current number of winding layers is an even number, the increase in the number of winding conductors will increase the motor inductance, resulting in a decrease in the excitation current, a decrease in the torque and power of the motor, and the possibility that the torque and power cannot be simultaneously satisfied during motor design.

[0044] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0045] The above has introduced in detail a motor stator, a manufacturing method of the motor stator, and a hairpin motor provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The descriptions of the above embodiments are only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor stator, characterized in that, it includes a stator winding and an integral stator core; a plurality of slot ducts extending along its own axis are evenly spaced on the inner side of the stator core, wherein the stator core divides each of the slot ducts into n layers along the radial direction and away from the axis, n≥5, and n is an odd number; the total number of the slot ducts is an even number; the stator winding is arranged in the slot ducts, the stator winding includes a first-phase winding, a second-phase winding and a third-phase winding, and the first-phase winding, the second-phase winding and the third-phase winding are all independent circuits; the independent circuits constituting the first-phase winding, the second-phase winding and the third-phase winding are respectively and sequentially arranged in a staggered manner in adjacent three consecutive slot ducts, and each independent circuit is formed by alternately connecting winding coils with a span of 1+3m slot ducts, where m is a positive integer; the adjacent three slot ducts with a span of 1+3m slot ducts constituting an independent circuit contain a repeated winding unit, and the repeated winding unit sequentially passes through the first layer of the first slot duct, the first layer of the second slot duct, the second layer of the first slot duct, the third layer of the second slot duct, the fourth layer of the first slot duct, the fifth layer of the first slot duct, the fifth layer of the third slot duct, the fourth layer of the second slot duct, the third layer of the third slot duct, the second layer of the second slot duct, the first layer of the third slot duct, and the first layer of the first slot duct of the next repeated winding unit is connected to the first layer of the first slot duct of the next repeated winding unit, and so on to form each independent circuit by repeated winding.

2. The motor stator according to claim 1, characterized in that, the first-phase winding is arranged in the slot ducts spaced 1+3m apart from each other, the second-phase winding is arranged adjacent to the first-phase winding, and the third-phase winding is arranged adjacent to the second-phase winding.

3. The motor stator according to claim 1, characterized in that, m is 2, and the independent circuits formed by the first-phase winding, the second-phase winding and the third-phase winding are respectively formed by alternately connecting winding coils with a span of 7 slot ducts.

4. The motor stator according to claim 1, characterized in that, the total number of the slot ducts is 36, 48, 60, 72 or 96.

5. The motor stator according to claim 1, characterized in that, one end face side of the stator core is a winding hairpin end, and the other end face side is a winding connection end; the input terminals and output terminals of the first-phase winding, the second-phase winding and the third-phase winding are all distributed on the winding hairpin end.

6. The motor stator according to claim 5, characterized in that, the wiring terminals are connected to the slip ring through three-phase wires, and the slip ring is connected to a corresponding independent circuit to form the input terminal.

7. A hairpin motor, characterized in that, it includes the motor stator according to any one of claims 1-6 and a rotor, and the rotor is coaxially arranged inside the motor stator.

8. A manufacturing method of the motor stator according to any one of claims 1-6, characterized in that, it includes steps: Steps for manufacturing a stator core: Manufacture a stator core. A plurality of winding grooves extending along its own axial direction are evenly spaced inside the stator core. Each of the winding grooves is divided into n layers along the radial direction and away from the axis, where n≥5 and n is an odd number; the total number of the winding grooves is an even number. Steps for winding an independent loop: Fix the starting end of the winding coil in one of the winding grooves. The winding coil winds alternately in winding grooves with a span of 1 + 3m winding grooves, where m is a positive integer; in three adjacent winding grooves with a span of 1 + 3m winding grooves, there is a repeated winding unit. The repeated winding unit sequentially passes through the first layer of the first winding groove, the first layer of the second winding groove, the second layer of the first winding groove, the third layer of the second winding groove, the fourth layer of the first winding groove, the fifth layer of the first winding groove, the fifth layer of the third winding groove, the fourth layer of the second winding groove, the third layer of the third winding groove, the second layer of the second winding groove, the first layer of the third winding groove. The first layer of the third winding groove is connected to the first layer of the first winding groove of the next repeated winding unit, and so on to form each independent loop by repeated winding. And Steps for manufacturing a stator winding: Repeat the steps of winding an independent loop in the winding grooves until all winding is completed. The stator winding includes a first-phase winding, a second-phase winding, and a third-phase winding. The first-phase winding, the second-phase winding, and the third-phase winding are each an independent loop; the independent loops sequentially arranged with a dislocation in three adjacent consecutive winding grooves respectively form the first-phase winding, the second-phase winding, and the third-phase winding.

9. The method for manufacturing an electric machine stator according to claim 8, characterized in that, the first-phase winding is arranged in winding grooves with an interval of 1 + 3m winding grooves from each other, the second-phase winding is arranged adjacent to the first-phase winding, and the third-phase winding is arranged adjacent to the second-phase winding.

10. The method for manufacturing an electric machine stator according to claim 8, characterized in that, m is 2, and the independent loops formed by the first-phase winding, the second-phase winding, and the third-phase winding are respectively formed by alternately connecting winding coils with a span of 7 winding grooves; and / or, the total number of the winding grooves is 36, 48, 60, 72, or 96.

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