Stator assembly and motor

Abstract

This invention provides a stator assembly and a motor. The stator assembly includes a stator core and multi-phase windings. The inner circumferential wall of the stator core has multiple slots along its circumference. Each slot has M layers of slots for conductor wiring. The multi-phase windings are arranged in the slots, where M is an even number. Each phase winding includes at least two parallel branches N, where N ≤ M / 2. The stator assembly is used in a motor with Q winding slots, P pole pairs, and m phases. The number of slots per pole per phase is q = Q / (2Pm), and the pole pitch is τ = Q / (2P). The stator assembly ensures that the conductors in the M layers of slots in each slot are all of the same phase through the winding of each phase winding. The stator assembly and motor provided by this invention can eliminate the need for insulating paper between conductors in the same slot, increase the copper fill factor of the windings, improve motor efficiency, reduce motor temperature rise, and simultaneously reduce insulation costs.

Description

Technical Field

[0001] This application relates to the field of drive motors for new energy vehicles, and in particular to a stator assembly and a motor. Background Technology

[0002] New energy electric vehicles have gained a leading advantage over traditional gasoline vehicles in terms of power, intelligence, and operating costs; however, the long charging time significantly limits their widespread adoption. To provide fast-charging solutions and improve the power density of drive systems, high-voltage requirements have been placed on vehicle drive motors.

[0003] New energy vehicle drive motors require lightweight construction and high power density. Compared to conventional round copper wire motors, flat wire motors can achieve a bare copper slot fill factor of over 60%, significantly higher than that of round copper wire motors. This increased slot fill factor, with a fixed number of slots, reduces the DC resistance of the windings, decreases copper losses, and improves motor efficiency. Therefore, flat wire motors have become an important measure for promoting vehicle lightweighting, increasing the driving range of electric vehicles, and reducing powertrain costs.

[0004] In related technologies, flat wire motors use a short-pitch design for their stator windings, with multiple conductors in the same slot located in different phases. Therefore, insulating paper is needed inside the slot to isolate the windings. However, the interphase insulating paper reduces the slot fill factor, increases copper losses, and raises the winding temperature, limiting the motor's power density. In addition, it also increases the motor's insulation cost. Summary of the Invention

[0005] This invention provides a stator assembly and a motor that can eliminate the need for insulating paper between conductors in the same slot, increase the copper fill factor of the winding, improve the efficiency of the motor, reduce the temperature rise of the motor, and reduce insulation costs.

[0006] One embodiment of the present invention provides a stator assembly, including a stator core and a multiphase winding. The inner peripheral wall of the stator core is provided with a plurality of slots along the circumferential direction. Each slot has M layers of slots for conductor wiring. The multiphase winding is arranged in the slots, where M is an even number. Each phase winding includes at least two parallel branches N, where N≤M / 2. The stator assembly is used for a motor with Q winding slots, P pole pairs, and m phases. The number of slots per pole per phase is q=Q / (2Pm), and the pole pitch is τ=Q / (2P). The stator assembly ensures that the conductors in the M layers of slots in each slot are all in the same phase through the winding of each phase winding.

[0007] The stator assembly provided in this invention eliminates the need for insulating paper between conductors in the same slot by setting all conductors in each slot to be in phase. This increases the copper fill factor of the windings, improves motor efficiency, reduces motor temperature rise, and lowers insulation costs. Furthermore, eliminating the insulating paper simplifies the conductor wiring process and improves motor manufacturing efficiency.

[0008] In one possible implementation, each of the parallel branches includes: a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment;

[0009] The first positive segment is introduced from the first edge layer. The first positive segment is wound alternately in two adjacent slots in the first direction along the circumference of the stator core with a first span y1 = τ, and then spans to the next two adjacent slots to be wound alternately for one round. This pattern continues until the first positive segment is wound M / 2 times and then wound to the second edge layer.

[0010] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment located in the second edge layer with a second span y2 in a first direction or a second direction;

[0011] The reverse segment is wound alternately in two adjacent slots in the second direction with a first span y1 = τ along the circumference of the stator core, and then spans to the next two adjacent slots for another alternating turn. This pattern continues until the reverse segment is wound M / 2 turns to the first edge layer.

[0012] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y3 in a second direction or a first direction;

[0013] The second positive segment is wound along the circumference of the stator core with a first span y1 = τ, alternating one turn in two adjacent slots in the first direction, and then straddles to the next two adjacent slots and is wound alternately one turn. This pattern continues until the second positive segment is wound M / 2 turns and reaches the second edge layer. The second positive segment is then led out from the second edge layer.

[0014] Wherein, one of the first edge layer and the second edge layer is a first layer slot, and the other is a Mth layer slot. The first direction and the second direction are opposite. The absolute values ​​of the differences between the second span y2 and the third span y3 and the first span y1 are all less than or equal to 2.

[0015] In one possible implementation, the second span y2 = τ-1, and the third span y3 = τ-2.

[0016] In one possible implementation, the second span y2 = τ-2, and the third span y3 = τ-1.

[0017] In one possible implementation, the second span y2 = τ + 2, and the third span y3 = τ + 1.

[0018] In one possible implementation, the second span y2 = τ + 1, and the third span y3 = τ + 2.

[0019] In one possible implementation, the second span y2 = τ + 1, and the third span y3 = τ - 1.

[0020] In one possible implementation, the second span y2 = τ-1, and the third span y3 = τ+1.

[0021] In one possible implementation, the motor is a 3-phase motor with P=3, Q=54, M=6, N=2, q=3, and τ=9.

[0022] In one possible implementation, the leads of each phase winding are connected together to form a star connection;

[0023] Alternatively, the leads of each phase winding can be connected end-to-end to form a triangular connection.

[0024] Another aspect of the present invention provides an electric motor, including the stator assembly described above.

[0025] The motor provided in this invention eliminates the need for insulating paper between conductors in the same slot by setting all conductors in each slot of the stator assembly to be in phase. This increases the copper fill factor of the windings, improves motor efficiency, reduces motor temperature rise, and lowers insulation costs. Furthermore, eliminating the insulating paper simplifies the conductor wiring process and improves motor manufacturing efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural schematic diagram of a stator assembly provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 The top view of the stator assembly provided in the image;

[0029] Figure 3 for Figure 1 The bottom view of the stator assembly provided in the image;

[0030] Figure 4 This is a three-dimensional structural diagram of a stator assembly with a wound A-phase winding provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the slot of a stator assembly provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the A-phase winding unfolded according to an embodiment of the present invention;

[0033] Figure 7 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the connection of the second parallel branch of the A-phase winding according to an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the stator assembly winding phase band distribution according to an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the lead wire connection structure of a stator assembly provided in an embodiment of the present invention;

[0037] Figure 11 This is a schematic diagram of the lead wire connection structure of a stator assembly provided in an embodiment of the present invention;

[0038] Figure 12 This is a schematic diagram of the structure of a first type of conductor in a stator assembly provided in an embodiment of the present invention;

[0039] Figure 13 This is a schematic diagram of the structure of a second type of conductor in a stator assembly provided in an embodiment of the present invention;

[0040] Figure 14 This is a schematic diagram of the structure of a third type of conductor in a stator assembly provided in an embodiment of the present invention;

[0041] Figure 15 This is a schematic diagram of the structure of a fourth type of conductor in a stator assembly provided in an embodiment of the present invention;

[0042] Figure 16 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention;

[0043] Figure 17 This is a schematic diagram of the connection of the second parallel branch of the A-phase winding according to an embodiment of the present invention;

[0044] Figure 18 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention;

[0045] Figure 19 This is a schematic diagram of the connection of the second parallel branch of the A-phase winding according to an embodiment of the present invention;

[0046] Figure 20 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention;

[0047] Figure 21 This is a schematic diagram of the connection of the second parallel branch of the A-phase winding according to an embodiment of the present invention;

[0048] Figure 22 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention;

[0049] Figure 23 This is a schematic diagram of the connection of the second parallel branch of the A-phase winding according to an embodiment of the present invention;

[0050] Figure 24 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention;

[0051] Figure 25 This is a schematic diagram of the connection of the second parallel branch of the A-phase winding according to an embodiment of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 100-Stator assembly;

[0054] 110 - Stator core;

[0055] 111 - Tank body;

[0056] 1111 - Slot;

[0057] 120-Multiphase winding;

[0058] 121 - Outgoing cable end;

[0059] 1211 - Lead end;

[0060] 1212 - Card Issuing End;

[0061] 122 - Welding end;

[0062] 200 - Class I conductor;

[0063] 300 - Class II conductor;

[0064] 400 - Class III conductor;

[0065] 500 - Class IV conductor. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features can be combined with each other.

[0067] First, let's explain some terms used in motors:

[0068] The number of poles in a motor refers to the number of magnetic poles in the motor. Magnetic poles are divided into N poles and poles. Generally, one N pole and one pole are called a pair of magnetic poles, which means the number of pole pairs is 1. The number of pole pairs in a motor is 1, 2, 3, or 4. Therefore, the number of poles (P) in a motor is 2, 4, 6, or 8.

[0069] Span (y) refers to the number of slots occupied between two adjacent effective sides of a coil. Span is also called pitch, and the pitch value is expressed in slot count. It should be noted that the effective side, also called the element, refers to the portion of the wave winding located within the stator slots. This portion cuts the magnetic field and induces electromotive force within the stator slots. For example, if the number of slots occupied between two adjacent effective sides of one phase wave winding (e.g., the U-phase wave winding) is 6, then the pitch is 6. If the number of slots occupied between two adjacent effective sides of one phase wave winding (e.g., the U-phase wave winding) is 12, then the pitch is 12.

[0070] It should be noted that, in this embodiment of the invention, for flat wire windings, since the U-shaped wire span may vary, the equivalent pitch is used to describe the pitch. The equivalent pitch of the flat wire refers to the distance between the upper and lower phase bands of the same phase winding located under adjacent poles.

[0071] Pole pitch: The distance a pole spans on the circumference of the stator, measured by the number of slots. Pole pitch = Number of stator slots / Number of poles.

[0072] Full pitch: The pitch is equal to the pole pitch, and the short pitch is less than the pole pitch. It should be noted that for flat wire windings, full pitch can refer to an effective pitch equal to the pole pitch, and short pitch can refer to an effective pitch less than the pole pitch. If there is no distinction between upper and lower bands, it is considered full pitch.

[0073] Slot fill factor: The ratio of the cross-sectional area of ​​the conductor in a specified sub-slot to the effective area of ​​the stator slot.

[0074] Winding: A winding with a combined pitch equal to an integer. When winding, two connected coils advance in a wave-like pattern.

[0075] Phase band: The area occupied by each phase winding under each pole.

[0076] In related technologies, flat wire motor stator windings mostly use a short-pitch design, with multiple conductors in the same slot located in different phases. Therefore, insulating paper needs to be placed in the slot to isolate the windings. However, the interphase insulating paper in the slot reduces the motor's slot fill factor, increases copper losses, increases winding temperature rise, limits the motor's power density, and also increases the motor's insulation cost.

[0077] To address the aforementioned problems, embodiments of the present invention provide a stator assembly and a motor. In this stator assembly, the winding of each phase winding ensures that all conductors in the M layers of slots within each slot are of the same phase. This eliminates the need for insulating paper between conductors within the same slot, increasing the copper fill factor of the windings, improving motor efficiency, reducing motor temperature rise, and lowering insulation costs. Furthermore, eliminating the insulating paper simplifies the conductor wiring process and improves motor manufacturing efficiency.

[0078] The stator assembly and motor provided in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0079] Figure 1 This is a three-dimensional structural diagram of a stator assembly 100 provided in an embodiment of the present invention. Figure 2 for Figure 1 The top view of the stator assembly 100 provided in the image. Figure 3 for Figure 1 The bottom view of the stator assembly 100 provided in the image. Figure 4 This is a three-dimensional structural diagram of a stator assembly 100 with a wound A-phase winding provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of the slot 111 of the stator assembly 100 provided in an embodiment of the present invention, with reference to... Figures 1 to 5 As shown, the stator assembly 100 provided in this embodiment of the invention includes: a stator core 110 and a multiphase winding 120. The inner peripheral wall of the stator core 110 is provided with a plurality of slots 111 along the circumferential direction. Each slot 111 has M layers of slot positions 1111 for conductor wiring, where M is an even number. The multiphase winding 120 is disposed in the slot positions 1111. For example,... Figure 5 As shown, each slot 111 contains six layers of slots 1111 for conductor wiring, namely layers a, b, c, d, e, and f. Each phase winding includes at least two parallel branches N, where N ≤ M / 2. For example, when M is 6, N can be 2 or 3.

[0080] The stator assembly 100 provided in this embodiment of the invention is used for a motor with Q slots 1111, P pole pairs, and m phases, wherein the number of slots per pole per phase q = Q / (2Pm) and the pole pitch τ = Q / (2P).

[0081] Specifically, the inner circumferential wall of the stator core 110 has multiple slots 111 distributed circumferentially. Each slot 111 extends axially along the stator core 110. Each slot 111 contains M-layer slot positions 1111 distributed radially along the stator core 110. The multiphase winding 120 is arranged in the slot 111 based on the M-layer slot positions 1111, and the multiphase winding 120 extends axially from the slot 111 along the stator core 110 to form a lead-out end 121 and a welding end 122. The lead-out end 121 further includes a lead end 1211 and a hairpin end 1212. The multiphase winding 120 is arranged in the slot 111 based on the M-layer slot positions 1111, so that the slot 111 has M layers of conductors.

[0082] In this design, the stator assembly 100 ensures that the conductors in each slot 111 are all in phase through the winding of each phase winding. This means that when the conductors in the same slot 111 are all in phase, the insulating paper between the conductors in the same slot 1111 can be eliminated, increasing the copper fill factor of the winding, improving motor efficiency, reducing motor temperature rise, and lowering insulation costs. Furthermore, eliminating the insulating paper simplifies the conductor wiring process and improves motor manufacturing efficiency.

[0083] The present application will now be described using specific embodiments.

[0084] Example 1

[0085] refer to Figures 1 to 5 As shown, this embodiment uses a 6-pole, 54-slot, 3-phase motor, i.e., P=3, Q=54, m=3, pole pitch τ=9, slot q=3 per pole per phase, and N=2 branches as an example for explanation. Each slot 111 is provided with M=6 layers of slots 1111 for conductor wiring, namely layers a, b, c, d, e, and f.

[0086] It should be noted that, in order to make the attached diagram clearer, only the winding diagram of phase A is shown in this diagram, and phase B and phase C windings are not involved. However, it should be understood that phase B and phase C windings are wound in the same way as phase A windings, but are 120° out of phase in space.

[0087] Figure 6 This is a schematic diagram of the A-phase winding unfolded according to an embodiment of the present invention. Figure 7 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 7 and combined Figure 6 As shown, the first parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0088] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 2a. Then, with a span of y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0089] For example, such as Figure 7 As shown, the winding method of the first positive segment is as follows:

[0090] 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f→

[0091] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the first direction with a second span y2 = τ - 1 = 8.

[0092] For example, such as Figure 7 As shown, the winding method of the first connecting segment is as follows:

[0093] 47f→1f

[0094] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0095] For example, such as Figure 7 As shown, the winding method for the reverse segment is as follows:

[0096] 1f→46e→37f→28e→19f→10e→1d→46c→37d→28c→19d→10c→1b→46a→37b→28a→19b→10a→

[0097] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer in the second direction with a third span y3 = τ - 2 = 7.

[0098] For example, such as Figure 7 As shown, the winding method of the second connecting segment is as follows:

[0099] 10a→3a

[0100] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 7 As shown, the second positive segment originates from 48f.

[0101] For example, such as Figure 7 As shown, the winding method of the second positive segment is as follows:

[0102] 3a→12b→21a→30b→39a→48b→3c→12d→21c→30d→39c→48d→3e→12f→21e→30f→39e→48f→

[0103] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0104] It should be noted that the arrow direction mentioned above is used to describe the direction of current in the conductor of the example winding, and this arrow direction is the same as the winding direction of the flat wire conductor.

[0105] Based on the above winding method. Figure 8 This is a connection diagram of the second parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 8 and combined Figure 6 As shown, the second parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0106] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 11a. Then, with a span y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0107] For example, such as Figure 8 As shown, the winding method of the first positive segment is as follows:

[0108] ←11a←20b←29a←38b←47a←2b←11c←20d←29c←38d←47c←2d←11e←20f←29e←38f←47e←2f

[0109] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the first direction with a second span y2 = τ - 1 = 8.

[0110] For example, such as Figure 8 As shown, the winding method of the first connecting segment is as follows:

[0111] 2f→10f

[0112] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0113] For example, such as Figure 8 As shown, the winding method for the reverse segment is as follows:

[0114] ←10f←1e←46f←37e←28f←19e←10d←1c←46d←37c←28d←19c←10b←1a←46b←37a←28b←19a

[0115] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer in the second direction with a third span y3 = τ - 2 = 7.

[0116] For example, such as Figure 8 As shown, the winding method of the second connecting segment is as follows:

[0117] 19a→12a

[0118] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 8 As shown, the second positive segment originates from 3f.

[0119] For example, such as Figure 8 As shown, the winding method of the second positive segment is as follows:

[0120] ←12a←21b←30a←39b←48a←3b←12c←21d←30c←39d←48c←3d←12e←21f←30e←39f←48e←3f

[0121] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0122] It should be noted that the arrow direction mentioned above is used to illustrate the direction of current in the conductor of the winding, and this arrow direction is opposite to the winding direction of the flat wire conductor.

[0123] Figure 9 This is a schematic diagram of the stator winding phase distribution according to an embodiment of the present invention, with reference to... Figure 9 and combined Figures 6 to 8 As shown, in the A-phase winding, B-phase winding, and C-phase winding arranged in the above manner, the conductors in each slot 111 are all of the same phase. When the conductors in the same slot 111 are all of the same phase, the insulating paper between the conductors in the same slot 1111 can be eliminated, increasing the copper fill factor of the winding, improving the efficiency of the motor, reducing the temperature rise of the motor, and reducing insulation costs. In addition, eliminating the insulating paper can also simplify the conductor wiring process and improve the motor manufacturing efficiency.

[0124] Furthermore, each parallel branch can traverse the slots 1111 of the arranged conductors, the magnetic circuits of the windings of each parallel branch are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.

[0125] Figure 10 This is a schematic diagram of the lead wire connection structure of the stator assembly 100 provided in an embodiment of the present invention. In this embodiment, the lead wires of each phase winding can be connected together to form a star connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the tails of the two parallel branches of phase A winding are connected to the tails of the two parallel branches of phase B winding and the tails of the two parallel branches of phase C winding.

[0126] Figure 11 This is a schematic diagram of the lead wire connection structure of the stator assembly 100 provided in an embodiment of the present invention. In this embodiment, the lead wires of each phase winding can be connected end to end to form a delta connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the two parallel branches of phase A winding, the two parallel branches of phase B winding, and the two parallel branches of phase C winding are connected end to end.

[0127] Figure 12This is a schematic diagram of the structure of the first type of conductor 200 of the stator assembly 100 provided in an embodiment of the present invention. Figure 13 This is a schematic diagram of the structure of the second type of conductor 300 of the stator assembly 100 provided in an embodiment of the present invention. Figure 14 This is a schematic diagram of the structure of the third type conductor 400 of the stator assembly 100 provided in an embodiment of the present invention. Figure 15 This is a schematic diagram of the structure of the fourth type conductor 500 of the stator assembly 100 provided in an embodiment of the present invention, with reference to... Figures 12 to 15 As shown, this embodiment includes: a first type of conductor 200, a second type of conductor 300, a third type of conductor 400, and a fourth type of conductor 500. The specific winding method of the above four types of conductors in the stator assembly 100 can be referred to the relevant technology, and will not be repeated here.

[0128] Example 2

[0129] refer to Figures 1 to 5 As shown, this embodiment uses a 6-pole, 54-slot, 3-phase motor, i.e., P=3, Q=54, m=3, pole pitch τ=9, slot q=3 per pole per phase, and N=2 branches as an example for explanation. Each slot 111 is provided with M=6 layers of slots 1111 for conductor wiring, namely layers a, b, c, d, e, and f.

[0130] It should be noted that, in order to make the attached diagram clearer, only the winding diagram of phase A is shown in this diagram, and phase B and phase C windings are not involved. However, it should be understood that phase B and phase C windings are wound in the same way as phase A windings, but are 120° out of phase in space.

[0131] Figure 6 This is a schematic diagram of the A-phase winding unfolded according to an embodiment of the present invention. Figure 16 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 16 and combined Figure 6 As shown, the first parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0132] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 1a. Then, with a span y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0133] For example, such as Figure 16As shown, the winding method of the first positive segment is as follows:

[0134] 1a→10b→19a→28b→37a→46b→1c→10d→19c→28d→37c→46d→1e→10f→19e→28f→37e→46f→

[0135] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the second direction with a second span y2 = τ - 2 = 7.

[0136] For example, such as Figure 16 As shown, the winding method of the first connecting segment is as follows:

[0137] 46f→39f

[0138] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0139] For example, such as Figure 16 As shown, the winding method for the reverse segment is as follows:

[0140] 39f→30e→21f→12e→3f→48e→39d→30c→21d→12c→3d→48c→39b→30a→21b→12a→3b→48a→

[0141] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y3 = τ - 1 = 8 in the first direction.

[0142] For example, such as Figure 16 As shown, the winding method of the second connecting segment is as follows:

[0143] 48a→2a

[0144] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 16 As shown, the second positive segment originates from 47f.

[0145] For example, such as Figure 16 As shown, the winding method of the second positive segment is as follows:

[0146] 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f→

[0147] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0148] It should be noted that the arrow direction mentioned above is used to describe the direction of current in the conductor of the example winding, and this arrow direction is the same as the winding direction of the flat wire conductor.

[0149] Based on the above winding method. Figure 17 This is a connection diagram of the second parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 17 and combined Figure 6 As shown, the second parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0150] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 10a. Then, with a span of y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0151] For example, such as Figure 17 As shown, the winding method of the first positive segment is as follows:

[0152] ←10a←19b←28a←37b←46a←1b←10c←19d←28c←37d←46c←1d←10e←19f←28e←37f←46e←1f

[0153] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the second direction with a second span y2 = τ - 2 = 7.

[0154] For example, such as Figure 17 As shown, the winding method of the first connecting segment is as follows:

[0155] 1f→48f

[0156] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0157] For example, such as Figure 17 As shown, the winding method for the reverse segment is as follows:

[0158] ←48f←39e←30f←21e←12f←3e←48d←39c←30d←21c←12d←3c←48b←39a←30b←21a←12b←3a

[0159] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y2 = τ - 1 = 8 in the first direction.

[0160] For example, such as Figure 17 As shown, the winding method of the second connecting segment is as follows:

[0161] 3a→11a

[0162] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 17 As shown, the second positive segment originates from 2f.

[0163] For example, such as Figure 17 As shown, the winding method of the second positive segment is as follows:

[0164] ←11a←20b←29a←38b←47a←2b←11c←20d←29c←38d←47c←2d←11e←20f←29e←38f←47e←2f

[0165] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0166] It should be noted that the arrow direction mentioned above is used to illustrate the direction of current in the conductor of the winding, and this arrow direction is opposite to the winding direction of the flat wire conductor.

[0167] refer to Figure 6 , Figure 9 and combined Figure 16 and Figure 17 As shown, in the A-phase winding, B-phase winding, and C-phase winding arranged in the above manner, the conductors in each slot 111 are all of the same phase. When the conductors in the same slot 111 are all of the same phase, the insulating paper between the conductors in the same slot 1111 can be eliminated, increasing the copper fill factor of the winding, improving the efficiency of the motor, reducing the temperature rise of the motor, and reducing insulation costs. In addition, eliminating the insulating paper can also simplify the conductor wiring process and improve the motor manufacturing efficiency.

[0168] Furthermore, each parallel branch can traverse the slots 1111 of the arranged conductors, the magnetic circuits of the windings of each parallel branch are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.

[0169] refer to Figure 10 In this embodiment, the leads of each phase winding can be connected together to form a star connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the tails of the two parallel branches of phase A winding are connected to the tails of the two parallel branches of phase B winding and the tails of the two parallel branches of phase C winding.

[0170] refer to Figure 11 In this embodiment, the leads of each phase winding can be connected end to end to form a delta connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the two parallel branches of phase A winding, the two parallel branches of phase B winding, and the two parallel branches of phase C winding are connected end to end.

[0171] refer to Figures 12 to 15 As shown, this embodiment includes: a first type of conductor 200, a second type of conductor 300, a third type of conductor 400, and a fourth type of conductor 500. The specific winding method of the above four types of conductors in the stator assembly 100 can be referred to the relevant technology, and will not be repeated here.

[0172] Example 3

[0173] refer to Figures 1 to 5 As shown, this embodiment uses a 6-pole, 54-slot, 3-phase motor, i.e., P=3, Q=54, m=3, pole pitch τ=9, slot q=3 per pole per phase, and N=2 branches as an example for explanation. Each slot 111 is provided with M=6 layers of slots 1111 for conductor wiring, namely layers a, b, c, d, e, and f.

[0174] It should be noted that, in order to make the attached diagram clearer, only the winding diagram of phase A is shown in this diagram, and phase B and phase C windings are not involved. However, it should be understood that phase B and phase C windings are wound in the same way as phase A windings, but are 120° out of phase in space.

[0175] Figure 18 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 18 and combined Figure 6 As shown, the first parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0176] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 1a. Then, with a span y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0177] For example, such as Figure 18 As shown, the winding method of the first positive segment is as follows:

[0178] 1a→10b→19a→28b→37a→46b→1c→10d→19c→28d→37c→46d→1e→10f→19e→28f→37e→46f→

[0179] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the first direction with a second span y2=τ+2=11.

[0180] For example, such as Figure 18 As shown, the winding method of the first connecting segment is as follows:

[0181] 46f→3f

[0182] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0183] For example, such as Figure 18 As shown, the winding method for the reverse segment is as follows:

[0184] 3f→48e→39f→30e→21f→12e→3d→48c→39d→30c→21d→12c→3b→48a→39b→30a→21b→12a→

[0185] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer in the second direction with a third span y3 = τ + 1 = 10.

[0186] For example, such as Figure 18 As shown, the winding method of the second connecting segment is as follows:

[0187] 12a→2a

[0188] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 18 As shown, the second positive segment originates from 47f.

[0189] For example, such as Figure 18 As shown, the winding method of the second positive segment is as follows:

[0190] 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f

[0191] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0192] It should be noted that the arrow direction mentioned above is used to describe the direction of current in the conductor of the example winding, and this arrow direction is the same as the winding direction of the flat wire conductor.

[0193] Based on the above winding method. Figure 19 This is a connection diagram of the second parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 20 and combined Figure 6 As shown, the second parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0194] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 10a. Then, with a span of y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0195] For example, such as Figure 19 As shown, the winding method of the first positive segment is as follows:

[0196] ←10a←19b←20a←37b←46a←1b←10c←19d←28c←37d←46c←1d←10e←19f←28e←37f←46e←1f

[0197] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the first direction with a second span y2=τ+2=11.

[0198] For example, such as Figure 19 As shown, the winding method of the first connecting segment is as follows:

[0199] 1f→12f

[0200] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0201] For example, such as Figure 19 As shown, the winding method for the reverse segment is as follows:

[0202] ←12f←3e←48f←39e←30f←21e←12d←3c←48d←39c←30d←21c←12b←3a←48b←39a←30b←21a

[0203] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer in the second direction with a third span y3 = τ + 1 = 10.

[0204] For example, such as Figure 19 As shown, the winding method of the second connecting segment is as follows:

[0205] 21a→11a

[0206] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 19 As shown, the second positive segment originates from 2f.

[0207] For example, such as Figure 19 As shown, the winding method of the second positive segment is as follows:

[0208] ←11a←20b←29a←38b←47a←2b←11c←20d←29c←38d←47c←2d←11e←20f←29e←38f←47e←2f

[0209] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0210] It should be noted that the arrow direction mentioned above is used to illustrate the direction of current in the conductor of the winding, and this arrow direction is opposite to the winding direction of the flat wire conductor.

[0211] refer to Figure 9 and combined Figure 6 , Figure 18 and Figure 19 As shown, in the A-phase winding, B-phase winding, and C-phase winding arranged in the above manner, the conductors in each slot 111 are all of the same phase. When the conductors in the same slot 111 are all of the same phase, the insulating paper between the conductors in the same slot 1111 can be eliminated, increasing the copper fill factor of the winding, improving the efficiency of the motor, reducing the temperature rise of the motor, and reducing insulation costs. In addition, eliminating the insulating paper can also simplify the conductor wiring process and improve the motor manufacturing efficiency.

[0212] Furthermore, each parallel branch can traverse the slots 1111 of the arranged conductors, the magnetic circuits of the windings of each parallel branch are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.

[0213] refer to Figure 10 As shown, in this embodiment, the leads of each phase winding can be connected together to form a star connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the tails of the two parallel branches of phase A winding are connected to the tails of the two parallel branches of phase B winding and the tails of the two parallel branches of phase C winding.

[0214] refer to Figure 11 In this embodiment, the leads of each phase winding can be connected end to end to form a delta connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the two parallel branches of phase A winding, the two parallel branches of phase B winding, and the two parallel branches of phase C winding are connected end to end.

[0215] refer to Figures 12 to 15 As shown, this embodiment includes: a first type of conductor 200, a second type of conductor 300, a third type of conductor 400, and a fourth type of conductor 500. The specific winding method of the above four types of conductors in the stator assembly 100 can be referred to the relevant technology, and will not be repeated here.

[0216] Example 4

[0217] refer to Figures 1 to 5 As shown, this embodiment uses a 6-pole, 54-slot, 3-phase motor, i.e., P=3, Q=54, m=3, pole pitch τ=9, slot q=3 per pole per phase, and N=2 branches as an example for explanation. Each slot 111 is provided with M=6 layers of slots 1111 for conductor wiring, namely layers a, b, c, d, e, and f.

[0218] It should be noted that, in order to make the attached diagram clearer, only the winding diagram of phase A is shown in this diagram, and phase B and phase C windings are not involved. However, it should be understood that phase B and phase C windings are wound in the same way as phase A windings, but are 120° out of phase in space.

[0219] Figure 20 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 20 and combined Figure 6 As shown, the first parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0220] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 2a. Then, with a span of y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0221] For example, such as Figure 20 As shown, the winding method of the first positive segment is as follows:

[0222] 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f→

[0223] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the second direction with a second span y2 = τ + 1 = 10.

[0224] For example, such as Figure 20 As shown, the winding method of the first connecting segment is as follows:

[0225] 47f→37f

[0226] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0227] For example, such as Figure 20 As shown, the winding method for the reverse segment is as follows:

[0228] 37f→28e→19f→10e→1f→46e→37d→28c→19d→10c→1d→46c→37b→28a→19b→10a→1b→46a→

[0229] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y3=τ+2=11 in the first direction.

[0230] For example, such as Figure 20 As shown, the winding method of the second connecting segment is as follows:

[0231] 43a→3a

[0232] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 20 As shown, the second positive segment originates from 48f.

[0233] For example, such as Figure 20 As shown, the winding method of the second positive segment is as follows:

[0234] 3a→12b→21a→30b→39a→48b→3c→12d→21c→30d→39c→48d→3e→12f→21e→30f→39e→48f→

[0235] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0236] It should be noted that the arrow direction mentioned above is used to describe the direction of current in the conductor of the example winding, and this arrow direction is the same as the winding direction of the flat wire conductor.

[0237] Based on the above winding method. Figure 21 This is a connection diagram of the second parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 21 and combined Figure 6 As shown, the second parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0238] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 11a. Then, with a span y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0239] For example, such as Figure 21 As shown, the winding method of the first positive segment is as follows:

[0240] ←11a←20b←29a←38b←47a←2b←11c←20d←29c←38d←47c←2d←11e←20f←29e←38f←47e←2f

[0241] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the second direction with a second span y2 = τ + 1 = 10.

[0242] For example, such as Figure 21 As shown, the winding method of the first connecting segment is as follows:

[0243] 2f→46f

[0244] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0245] For example, such as Figure 21 As shown, the winding method for the reverse segment is as follows:

[0246] ←46f←37e←28f←19e←10f←1e←46d←37c←28d←19c←10d←1c←46b←37a←28b←19a←10b←1a

[0247] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y2=τ+2=11 in the first direction.

[0248] For example, such as Figure 21 As shown, the winding method of the second connecting segment is as follows:

[0249] 1a→12a

[0250] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 21 As shown, the second positive segment originates from 3f.

[0251] For example, such as Figure 21 As shown, the winding method of the second positive segment is as follows:

[0252] ←12a←21b←30a←39b←48a←3b←12c←21d←30c←39d←48c←3d←12e←21f←30e←39f←48e←3f

[0253] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0254] It should be noted that the arrow direction mentioned above is used to illustrate the direction of current in the conductor of the winding, and this arrow direction is opposite to the winding direction of the flat wire conductor.

[0255] refer to Figure 20 , Figure 21 and combined Figure 6 and Figure 9 As shown, in the A-phase winding, B-phase winding, and C-phase winding arranged in the above manner, the conductors in each slot 111 are all of the same phase. When the conductors in the same slot 111 are all of the same phase, the insulating paper between the conductors in the same slot 1111 can be eliminated, increasing the copper fill factor of the winding, improving the efficiency of the motor, reducing the temperature rise of the motor, and reducing insulation costs. In addition, eliminating the insulating paper can also simplify the conductor wiring process and improve the motor manufacturing efficiency.

[0256] Furthermore, each parallel branch can traverse the slots 1111 of the arranged conductors, the magnetic circuits of the windings of each parallel branch are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.

[0257] refer to Figure 10 In this embodiment, the leads of each phase winding can be connected together to form a star connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the tails of the two parallel branches of phase A winding are connected to the tails of the two parallel branches of phase B winding and the tails of the two parallel branches of phase C winding.

[0258] refer to Figure 11 In this embodiment, the leads of each phase winding can be connected end to end to form a delta connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the two parallel branches of phase A winding, the two parallel branches of phase B winding, and the two parallel branches of phase C winding are connected end to end.

[0259] refer to Figures 12 to 15 As shown, this embodiment includes: a first type of conductor 200, a second type of conductor 300, a third type of conductor 400, and a fourth type of conductor 500. The specific winding method of the above four types of conductors in the stator assembly 100 can be referred to the relevant technology, and will not be repeated here.

[0260] Example 5

[0261] refer to Figures 1 to 5 As shown, this embodiment uses a 6-pole, 54-slot, 3-phase motor, i.e., P=3, Q=54, m=3, pole pitch τ=9, slot q=3 per pole per phase, and N=2 branches as an example for explanation. Each slot 111 is provided with M=6 layers of slots 1111 for conductor wiring, namely layers a, b, c, d, e, and f.

[0262] It should be noted that, for clarity, this diagram only shows the winding schematic of phase A and does not involve phase B and phase C windings. However, it should be understood that phase B and phase C windings are not included in this diagram.

[0263] The winding method of the winding is the same as that of the A-phase winding, but the spatial phase difference is 120°.

[0264] Figure 22 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 22 and combined Figure 6 As shown, the first parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0265] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 1a. Then, with a span y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0266] For example, such as Figure 22 As shown, the winding method of the first positive segment is as follows:

[0267] 1a→10b→19a→28b→37a→46b→1c→10d→19c→28d→37c→46d→1e→10f→19e→28f→37e→46f→

[0268] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the first direction with a second span y2 = τ + 1 = 10.

[0269] For example, such as Figure 22 As shown, the winding method of the first connecting segment is as follows:

[0270] 46f→2f

[0271] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0272] For example, such as Figure 22 As shown, the winding method for the reverse segment is as follows:

[0273] 2f→47e→38f→29e→20f→11e→2d→47c→38d→29c→20d→11c→2b→47a→38b→29a→20b→11a→

[0274] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer in the second direction with a third span y3=τ-2=8.

[0275] For example, such as Figure 22 As shown, the winding method of the second connecting segment is as follows:

[0276] 11a→3a

[0277] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 22 As shown, the second positive segment originates from 48f.

[0278] For example, such as Figure 22 As shown, the winding method of the second positive segment is as follows:

[0279] 3a→12b→21a→30b→39a→48b→3c→12d→21c→30d→39c→48d→3e→12f→21e→30f→39e→48f

[0280] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0281] It should be noted that the arrow direction mentioned above is used to describe the direction of current in the conductor of the example winding, and this arrow direction is the same as the winding direction of the flat wire conductor.

[0282] Based on the above winding method. Figure 23 This is a connection diagram of the second parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 23 and combined Figure 6 As shown, the second parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0283] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 10a. Then, with a span of y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0284] For example, such as Figure 23 As shown, the winding method of the first positive segment is as follows:

[0285] ←10a←19b←20a←37b←46a←1b←10c←19d←28c←37d←46c←1d←10e←19f←28e←37f←46e←1f

[0286] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the first direction with a second span y2 = τ + 1 = 10.

[0287] For example, such as Figure 23 As shown, the winding method of the first connecting segment is as follows:

[0288] 1f→10f

[0289] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0290] For example, such as Figure 23 As shown, the winding method for the reverse segment is as follows:

[0291] ←11f←2e←47f←38e←29f←20e←11d←2c←47d←38c←29d←20c←11b←2a←47b←38a←29b←20a

[0292] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer in the second direction with a third span y3=τ-2=8.

[0293] For example, such as Figure 23 As shown, the winding method of the second connecting segment is as follows:

[0294] 20a→12a

[0295] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 23 As shown, the second positive segment originates from 3f.

[0296] For example, such as Figure 23 As shown, the winding method of the second positive segment is as follows:

[0297] ←12a←21b←30a←39b←48a←3b←12c←21d←30c←39d←48c←3d←12e←21f←30e←39f←48e←3f

[0298] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0299] It should be noted that the arrow direction mentioned above is used to illustrate the direction of current in the conductor of the winding, and this arrow direction is opposite to the winding direction of the flat wire conductor.

[0300] refer to Figure 9 and combined Figure 6 , Figure 22 and Figure 23 As shown, in the A-phase winding, B-phase winding, and C-phase winding arranged in the above manner, the conductors in each slot 111 are all of the same phase. When the conductors in the same slot 111 are all of the same phase, the insulating paper between the conductors in the same slot 1111 can be eliminated, increasing the copper fill factor of the winding, improving the efficiency of the motor, reducing the temperature rise of the motor, and reducing insulation costs. In addition, eliminating the insulating paper can also simplify the conductor wiring process and improve the motor manufacturing efficiency.

[0301] Furthermore, each parallel branch can traverse the slots 1111 of the arranged conductors, the magnetic circuits of the windings of each parallel branch are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.

[0302] refer to Figure 10 As shown, in this embodiment, the leads of each phase winding can be connected together to form a star connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the tails of the two parallel branches of phase A winding are connected to the tails of the two parallel branches of phase B winding and the tails of the two parallel branches of phase C winding.

[0303] refer to Figure 11 In this embodiment, the leads of each phase winding can be connected end to end to form a delta connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the two parallel branches of phase A winding, the two parallel branches of phase B winding, and the two parallel branches of phase C winding are connected end to end.

[0304] refer to Figures 12 to 15 As shown, this embodiment includes: a first type of conductor 200, a second type of conductor 300, a third type of conductor 400, and a fourth type of conductor 500. The specific winding method of the above four types of conductors in the stator assembly 100 can be referred to the relevant technology, and will not be repeated here.

[0305] Example 6

[0306] refer to Figures 1 to 5 As shown, this embodiment uses a 6-pole, 54-slot, 3-phase motor, i.e., P=3, Q=54, m=3, pole pitch τ=9, slot q=3 per pole per phase, and N=2 branches as an example for explanation. Each slot 111 is provided with M=6 layers of slots 1111 for conductor wiring, namely layers a, b, c, d, e, and f.

[0307] It should be noted that, in order to make the attached diagram clearer, only the winding diagram of phase A is shown in this diagram, and phase B and phase C windings are not involved. However, it should be understood that phase B and phase C windings are wound in the same way as phase A windings, but are 120° out of phase in space.

[0308] Figure 24 This is a connection diagram of the first parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 24 and combined Figure 6 As shown, the first parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0309] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 1a. Then, with a span y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0310] For example, such as Figure 24 As shown, the winding method of the first positive segment is as follows:

[0311] 1a→10b→19a→28b→37a→46b→1c→10d→19c→28d→37c→46d→1e→10f→19e→28f→37e→46f→

[0312] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the second direction with a second span y2 = τ - 2 = 8.

[0313] For example, such as Figure 24 As shown, the winding method of the first connecting segment is as follows:

[0314] 46f→38f

[0315] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0316] For example, such as Figure 24 As shown, the winding method for the reverse segment is as follows:

[0317] 38f→29e→20f→11e→2f→47e→38d→29c→20d→11c→2d→47c→38b→29a→20b→11a→2b→47a→

[0318] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y3 = τ + 1 = 10 in the first direction.

[0319] For example, such as Figure 24 As shown, the winding method of the second connecting segment is as follows:

[0320] 47a→3a

[0321] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 24 As shown, the second positive segment originates from 48f.

[0322] For example, such as Figure 24 As shown, the winding method of the second positive segment is as follows:

[0323] 3a→12b→21a→30b→39a→48b→3c→12d→21c→30d→39c→48d→3e→12f→21e→30f→39e→48f

[0324] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0325] It should be noted that the arrow direction mentioned above is used to describe the direction of current in the conductor of the example winding, and this arrow direction is the same as the winding direction of the flat wire conductor.

[0326] Based on the above winding method. Figure 25 This is a connection diagram of the second parallel branch of the A-phase winding provided in an embodiment of the present invention, with reference to... Figure 25 and combined Figure 6 As shown, the second parallel branch of phase A winding includes a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment.

[0327] The first positive segment is introduced from the first edge layer. For example, the first positive segment is introduced from 10a. Then, with a span of y1 = τ = 9, it is wound alternately in two adjacent slots 1111 in a first direction (the first direction can be clockwise or counterclockwise, here the first direction is clockwise) along the axial direction of the stator core 110. Then it is wound alternately in the next two adjacent slots 1111. This pattern continues until the first positive segment is wound along the M / 2 = 3 axis to the second edge layer.

[0328] For example, such as Figure 25 As shown, the winding method of the first positive segment is as follows:

[0329] ←10a←19b←28a←37b←46a←1b←10c←19d←28c←37d←46c←1d←10e←19f←28e←37f←46e←1f

[0330] The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment in the second edge layer in the second direction with a second span y2 = τ - 1 = 8.

[0331] For example, such as Figure 25 As shown, the winding method of the first connecting segment is as follows:

[0332] 1f→47f

[0333] The reverse section is wound along the circumference of the stator core 110 with a first span y1 = τ = 9 in the second direction (the second direction is opposite to the first direction, which is counterclockwise in this case) alternatingly in two adjacent slots 1111 for one round, and then straddles to the next two adjacent slots 1111 for another round of alternating winding. This pattern continues until the reverse section is wound M / 2 = 3 times and reaches the first edge layer.

[0334] For example, such as Figure 25 As shown, the winding method for the reverse segment is as follows:

[0335] ←47f←38e←29f←20e←11f←2e←47d←38c←29d←20c←11d←2c←47b←38a←29b←20a←11b←2a

[0336] The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y2 = τ + 1 = 10 in the first direction.

[0337] For example, such as Figure 25 As shown, the winding method of the second connecting segment is as follows:

[0338] 2a→12a

[0339] The second positive segment, with a first span y1 = τ = 9, is wound alternately once in two adjacent slots 1111 along the circumference of the stator core 110 in the first direction, and then spans to the next two adjacent slots 1111 for another alternating turn. This pattern continues until the second positive segment has been wound M / 2 = 3 times to the second edge layer. The second positive segment is then led out from the second edge layer. For example, as shown... Figure 25 As shown, the second positive segment originates from 3f.

[0340] For example, such as Figure 25 As shown, the winding method of the second positive segment is as follows:

[0341] ←12a←21b←30a←39b←48a←3b←12c←21d←30c←39d←48c←3d←12e←21f←30e←39f←48e←3f

[0342] Among them, one of the first edge layer and the second edge layer is the first layer slot 1111, i.e., the a layer slot 1111, and the other is the Mth layer slot 1111, i.e., the f layer slot 1111. The first direction is opposite to the second direction. The absolute value of the difference between the second span y2 and the third span y3 and the first span y1 is such that it is less than or equal to 2.

[0343] It should be noted that the arrow direction mentioned above is used to illustrate the direction of current in the conductor of the winding, and this arrow direction is opposite to the winding direction of the flat wire conductor.

[0344] refer to Figure 24 , Figure 25 and combined Figure 6 and Figure 9 As shown, in the A-phase winding, B-phase winding, and C-phase winding arranged in the above manner, the conductors in each slot 111 are all of the same phase. When the conductors in the same slot 111 are all of the same phase, the insulating paper between the conductors in the same slot 1111 can be eliminated, increasing the copper fill factor of the winding, improving the efficiency of the motor, reducing the temperature rise of the motor, and reducing insulation costs. In addition, eliminating the insulating paper can also simplify the conductor wiring process and improve the motor manufacturing efficiency.

[0345] Furthermore, each parallel branch can traverse the slots 1111 of the arranged conductors, the magnetic circuits of the windings of each parallel branch are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.

[0346] refer to Figure 10 In this embodiment, the leads of each phase winding can be connected together to form a star connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the tails of the two parallel branches of phase A winding are connected to the tails of the two parallel branches of phase B winding and the tails of the two parallel branches of phase C winding.

[0347] refer to Figure 11 In this embodiment, the leads of each phase winding can be connected end to end to form a delta connection. Taking a three-phase winding (phase A, phase B, and phase C) as an example, the two parallel branches of phase A winding, the two parallel branches of phase B winding, and the two parallel branches of phase C winding are connected end to end.

[0348] refer to Figures 12 to 15 As shown, this embodiment includes: a first type conductor 200, a second type conductor 300, a third type conductor 400, and a fourth type conductor 500. The specific winding method of the above four types of conductors in the stator assembly 100 can be referred to the relevant technology, and will not be repeated here.

[0349] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0350] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0351] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0352] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0353] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator assembly, characterized in that, The stator assembly includes a stator core and multiphase windings. The inner circumferential wall of the stator core is provided with multiple slots along the circumferential direction. Each slot is provided with M layers of slots for conductor wiring. The multiphase windings are arranged in the slots. M is an even number. Each phase winding includes at least two parallel branches N, where N≤M / 2. The stator assembly is used for a motor with Q winding slots, P pole pairs, and m phases. The number of slots per pole per phase is q=Q / (2Pm), and the pole pitch is τ=Q / (2P). The stator assembly ensures that the conductors in the M layers of slots in each slot are in the same phase through the winding of each phase winding; Each of the parallel branches includes: a first forward segment, a reverse segment, a second forward segment, a first connecting segment, and a second connecting segment; The first positive segment is introduced from the first edge layer. The first positive segment is wound in the first direction along the circumference of the stator core with a first span y1=τ, alternating one turn in two adjacent slots, and then straddles to the next two adjacent slots to be wound in the same way. This pattern continues until the first positive segment is wound M / 2 turns to the second edge layer. The first connecting segment connects the tail end of the first forward segment to the head end of the reverse segment located in the second edge layer with a second span y2 in a first direction or a second direction; The reverse segment is wound alternately in two adjacent slots in the second direction with a first span y1=τ along the circumference of the stator core, and then spans to the next two adjacent slots for another alternating turn. This pattern continues until the reverse segment is wound M / 2 turns to the first edge layer. The second connecting segment connects the tail end of the reverse segment to the head end of the second forward segment located in the first edge layer with a third span y3 in a second direction or a first direction; The second positive segment is wound in the first direction along the circumference of the stator core with a first span y1=τ, alternating one turn in two adjacent slots, and then straddles to the next two adjacent slots and is wound in the same way. This pattern continues until the second positive segment is wound M / 2 turns and reaches the second edge layer. The second positive segment is then led out from the second edge layer. Wherein, one of the first edge layer and the second edge layer is a first layer slot, and the other is a Mth layer slot. The first direction and the second direction are opposite. The absolute values ​​of the differences between the second span y2 and the third span y3 and the first span y1 are all less than or equal to 2.

2. The stator assembly according to claim 1, characterized in that, The second span y2 = τ-1, and the third span y3 = τ-2.

3. The stator assembly according to claim 1, characterized in that, The second span y2 = τ-2, and the third span y3 = τ-1.

4. The stator assembly according to claim 1, characterized in that, The second span y2 = τ + 2, and the third span y3 = τ + 1.

5. The stator assembly according to claim 1, characterized in that, The second span y2 = τ + 1, and the third span y3 = τ + 2.

6. The stator assembly according to claim 1, characterized in that, The second span y2 = τ + 1, and the third span y3 = τ - 1.

7. The stator assembly according to claim 1, characterized in that, The second span y2 = τ-1, and the third span y3 = τ+1.

8. The stator assembly according to any one of claims 1-7, characterized in that, The motor is a 3-phase motor with P=3, Q=54, M=6, N=2, q=3, and τ=9.

9. The stator assembly according to claim 7, characterized in that, The leads of each phase winding are connected together to form a star connection; Alternatively, the leads of each phase winding can be connected end-to-end to form a triangular connection.

10. An electric motor, characterized in that, Includes the stator assembly as described in any one of claims 1-8.

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