Stator assembly and drive motor
By adopting a co-phase winding design in the stator assembly of the drive motor, eliminating the insulation paper between different phases, improving the slot fill factor, and simplifying the wiring process, the problem of low slot fill factor is solved, achieving high efficiency and low cost motor performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG ZEEKR INTELLIGENT TECH CO LTD
- Filing Date
- 2022-11-28
- Publication Date
- 2026-07-21
AI Technical Summary
Low slot fill factor in the stator assembly of the drive motor leads to problems such as high temperature, low efficiency, and increased insulation costs.
Each parallel branch of each phase winding includes a first coil group and a second coil group. By winding with a specific span, it is ensured that each layer of conductors in each winding mounting slot is in phase, eliminating the insulation paper between different phases, improving the slot fill factor and simplifying the wiring process.
It increases the slot fill factor, reduces insulation costs, improves manufacturing efficiency, and reduces winding DC resistance, copper loss, motor efficiency, and driving range by lowering the slot fill factor.
Smart Images
Figure CN115765260B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of drive motor technology, and more particularly to a stator assembly and a drive motor. Background Technology
[0002] The drive motor is a crucial component of electric vehicles, providing power. The stator assembly of the drive motor has winding mounting slots, within which multi-phase windings are installed, resulting in multiple layers of conductors within the slots. Each multi-phase winding consists of coils with a specific number of turns. The proportion of space occupied by the coils within the mounting slots is called the slot fill factor. A high slot fill factor results in lower temperature rise and higher efficiency for the drive motor.
[0003] However, in related technologies, the conductors in each layer of the winding mounting slot have different phases. In order to prevent the conductors in each layer from affecting each other, insulating paper is also provided between the conductors for isolation. The insulating paper occupies the usable space of the winding mounting slot, which reduces the slot fill factor. Summary of the Invention
[0004] In view of the above problems, this application provides a stator assembly and a drive motor to solve the technical problem of low slot fill factor.
[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:
[0006] The first aspect of this application provides a stator assembly, which includes a stator core and multi-phase windings. The inner circumferential wall of the stator core has multiple winding mounting slots distributed circumferentially. Each winding mounting slot has M layers of slots for conductor wiring. The M layers of slots are arranged radially along the stator core. The multi-phase windings are arranged in the winding mounting slots based on the M layers of slots, so that each winding mounting slot has M layers of conductors, where M is an even number. Each phase winding includes a parallel branches, where a ≤ M / 2. Each parallel branch includes a first coil group, a second coil group, and connecting wires. The first coil group includes a first positive coil, a first negative coil, and a first layer wire. The first positive coil is wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core in a first direction with a first span. The first negative coil is wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core in a second direction with the first span. The first layer wire is used to connect adjacent first positive coils and first negative coils, both located in the Mth layer slot, with a second span. The second coil group includes multiple second positive coils, multiple second negative coils, and multiple second layer wires. Two positive coils are wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core in a first direction with a first span. The plurality of second negative coils are wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core in a second direction with a first span. A portion of the second same-layer wires connect adjacent second positive coils and second negative coils, both located in the Mth layer slot, with a first span; another portion of the second same-layer wires connect adjacent second positive coils and second negative coils, both located in the first layer slot, with a first span. The connecting wire is used to connect adjacent, equally located, second positive coils and second negative coils with a third span. The first reverse coil and the second positive coil are located in the first layer slot; wherein the M-layer conductors in each winding mounting slot are in phase; the first span is: y1 = τ; the difference between the second span y2 and the first span y1 is 1; when the winding direction of the connecting wire is the same as the first direction, the third span is: y3 = y2; when the winding direction of the connecting wire is opposite to the first direction, the difference between the third span y3 and the first span y1 is 1 and the difference between the third span y3 and the second span y2 is 2; the first direction and the second direction are opposite.
[0007] In one possible implementation, the first positive coil is wound M / 2 turns around the stator core in the first direction, and the first negative coil is wound M / 2 turns around the stator core in the second direction; the plurality of second positive coils are wound two turns around the stator core in the first direction, and the plurality of second negative coils are wound one turn around the stator core in the second direction.
[0008] In one possible implementation, the first layer wire is wound around the stator core in the first direction along the circumference of the stator core, a portion of the second layer wire is wound around the stator core in the first direction along the circumference of the stator core, and another portion of the second layer wire is wound around the stator core in the second direction along the circumference of the stator core.
[0009] In one possible implementation, the second span is y2 = τ + 1; if the connecting line is wound around the stator core in the first direction along the circumference, the third span is y3 = τ + 1; if the connecting line is wound around the stator core in the second direction along the circumference, the third span is y3 = τ - 1.
[0010] In another possible implementation, the second span is y2 = τ-1; if the connecting line is wound around the stator core in the first direction, the third span is y3 = τ-1; if the connecting line is wound around the stator core in the second direction, the third span is y3 = τ+1.
[0011] In one possible implementation, the leads of each phase winding are connected together to form a star connection; or the leads of each phase winding are connected end-to-end to form a delta connection.
[0012] In one possible implementation, the first coil group includes a first type of coil, which includes a first lead segment, a first welded segment, and a first straight segment. The first straight segment is located between the first welded segment and the first lead segment and is disposed in the winding mounting slot. The first welded segment and the first lead segment are disposed opposite each other along the axial direction of the stator core, and the first welded segment and the first lead segment extend out of the winding mounting slot along the axial direction of the stator core.
[0013] In one possible implementation, the first coil group includes a second type of coil, which includes a second straight segment, a third straight segment, a hairpin segment, a second welded segment, and a third welded segment. The second and third straight segments are parallel and are radially spaced apart along the stator core. Both the second and third straight segments are located in the winding mounting slot. The two ends of the hairpin segment are connected to the second and third straight segments, respectively. The second welded segment is connected to the second straight segment, and the third welded segment is connected to the third straight segment. The hairpin segment, the second welded segment, and the third welded segment are arranged axially opposite to each other along the stator core, and both the hairpin segment, the second welded segment, and the third welded segment extend axially beyond the winding mounting slot along the stator core.
[0014] Optionally, all the multiphase windings are made of flat wire conductors.
[0015] A second aspect of this application provides a drive motor that includes the stator assembly described in any of the above embodiments.
[0016] The stator assembly and drive motor of this application embodiment have multiple winding mounting slots distributed circumferentially on the inner peripheral wall of the stator core. Each winding mounting slot is provided with M layers of slots arranged radially along the stator core. Multiphase windings are arranged in the winding mounting slots based on the M layers of slots, so that the winding mounting slots have M layers of conductors. Each parallel branch of each multiphase winding includes a first coil group, a second coil group, and connecting wires. The first coil group includes a first positive coil, a first negative coil, and a first same-layer wire. The first positive coil is connected with a first span... The first positive coil is wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core in a first direction. The first negative coil is wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core in a second direction with a first span. The first co-layer wire is used to connect adjacent first positive coils and first negative coils, both located in the Mth layer slot, with a second span. The second coil group includes multiple second positive coils, multiple second negative coils, and multiple second co-layer wires. The multiple second positive coils are wound sequentially from the first layer slot to the first layer slot along the circumference of the stator core in a first direction with a first span. The winding is then continued to the Mth layer slot. Multiple second reverse coils are sequentially wound from the Mth layer slot to the first layer slot along the circumference of the stator core in a second direction with a first span. A portion of the second-layer wires connect adjacent second positive and second reverse coils, both located in the Mth layer slot, with a first span. Another portion of the second-layer wires connect adjacent second positive and second reverse coils, both located in the first layer slot, with a first span. Connecting wires are used to connect adjacent first reverse and second positive coils, both located in the first layer slot, with a third span. Each... All M layers of conductors in each winding mounting slot 101 are in phase, M ≥ 4 and are even; the first span is: y1 = τ; the difference between the second span y2 and the first span y1 is 1; when the winding direction of the connecting wire is the same as the first direction, the third span is: y3 = y2; when the winding direction of the connecting wire is opposite to the first direction, the difference between the third span y3 and the first span y1 is 1 and the difference between the third span y3 and the second span y2 is 2; the first direction and the second direction are opposite. The first coil group and the second coil group are wound into the winding mounting slot according to the first span, second span, and third span, ensuring that all layers of conductors in each winding mounting slot are in phase, eliminating the need for insulating paper between different phases in the winding mounting slot, improving slot fill factor, simplifying the stator assembly wiring process, reducing insulation costs, and improving manufacturing efficiency. Attached Figure Description
[0017] 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.
[0018] Figure 1 A three-dimensional structural diagram of the stator assembly provided in the embodiments of this application. Figure 1 ;
[0019] Figure 2 A schematic diagram of the A-phase winding of the stator assembly provided in the embodiments of this application;
[0020] Figure 3 A top view of the stator assembly provided in an embodiment of this application;
[0021] Figure 4 A bottom view of the stator assembly provided in an embodiment of this application;
[0022] Figure 5 This is a schematic diagram of the winding mounting slot of the stator assembly provided in an embodiment of this application;
[0023] Figure 6 Schematic diagram of the lead wire connection structure of the stator assembly provided in the embodiments of this application Figure 1 ;
[0024] Figure 7 Schematic diagram of the lead wire connection structure of the stator assembly provided in the embodiments of this application Figure 2 ;
[0025] Figure 8 A schematic diagram of the structure of a first type of coil in a stator assembly provided in an embodiment of this application;
[0026] Figure 9 Schematic diagram of the structure of the second type of coil of the stator assembly provided in the embodiments of this application Figure 1 ;
[0027] Figure 10 Schematic diagram of the structure of the second type of coil of the stator assembly provided in the embodiments of this application Figure 2 ;
[0028] Figure 11 Schematic diagram of the structure of the second type of coil of the stator assembly provided in the embodiments of this application Figure 3 ;
[0029] Figure 12 This is a schematic diagram of the A-phase winding as provided in Embodiment 1 of this application;
[0030] Figure 13This is a connection diagram of the first coil group of the first parallel branch provided in Embodiment 1 of this application;
[0031] Figure 14 This is a connection diagram of the second coil group of the first parallel branch provided in Embodiment 1 of this application;
[0032] Figure 15 This is a connection diagram of the first parallel branch provided in Embodiment 1 of this application;
[0033] Figure 16 This is a connection diagram of the second parallel branch provided in Embodiment 1 of this application;
[0034] Figure 17 This is a connection diagram of the first parallel branch provided in Embodiment 2 of this application;
[0035] Figure 18 This is a connection diagram of the second parallel branch provided in Embodiment 2 of this application;
[0036] Figure 19 This is a schematic diagram of the A-phase winding as provided in Embodiment 3 of this application;
[0037] Figure 20 This is a connection diagram of the first coil group of the first parallel branch provided in Embodiment 3 of this application;
[0038] Figure 21 This is a connection diagram of the second coil group of the first parallel branch provided in Embodiment 3 of this application;
[0039] Figure 22 This is a connection diagram of the first parallel branch provided in Embodiment 3 of this application;
[0040] Figure 23 This is a connection diagram of the second parallel branch provided in Embodiment 3 of this application;
[0041] Figure 24 This is a connection diagram of the first parallel branch provided in Embodiment 4 of this application;
[0042] Figure 25 This is a connection diagram of the second parallel branch provided in Embodiment 4 of this application;
[0043] Figure 26 This is a schematic diagram of the winding phase distribution of the stator assembly according to an embodiment of this application.
[0044] Explanation of reference numerals in the attached figures:
[0045] 100 - Stator core;
[0046] 101 - Winding mounting slot;
[0047] 200 - Outgoing wire end; 201 - Lead wire end; 202 - Card issuing end;
[0048] 300 - Welding end;
[0049] 401 - First lead segment; 402 - First bend segment; 403 - First straight segment; 404 - Second bend segment; 405 - First welding segment;
[0050] 501 - Hairpin section; 502 - Second straight section; 503 - Third straight section; 504 - Third bending section; 505 - Fourth bending section; 506 - Second welding section; 507 - Third welding section. Detailed Implementation
[0051] As described in the background section, the stator components in related technologies suffer from low slot fill factor. Researchers have found that this is because, for the same power output, higher voltage results in lower operating current. Therefore, increasing the voltage significantly reduces the internal resistance loss of the drive motor under the same power demand, improving drive system efficiency and consequently reducing the battery capacity required to achieve the same driving range, thus reducing battery costs and overall vehicle weight. Simultaneously, increasing the voltage also improves charging efficiency, enabling fast charging and greatly enhancing the electric vehicle user experience. To achieve these requirements, related technologies employ a short-pitch scheme, allowing multiple conductors within the same winding mounting slot to have different phases. To prevent mutual interference between conductor layers within the winding mounting slot, insulating paper is placed between each layer for isolation. This insulating paper occupies space in the winding mounting slot, reducing the slot fill factor. A lower fill factor leads to increased copper losses and increased temperature rise in the multi-phase winding, limiting the drive motor's power density and increasing insulation costs.
[0052] To address the aforementioned technical problems, this application provides a stator assembly applicable to multi-phase winding drive motors. Each parallel branch of each phase winding includes a first coil group and a second coil group. The first and second coil groups are wound into the winding mounting slots according to a certain span, ensuring that each layer of conductors in each winding mounting slot is in the same phase. This eliminates the need for insulating paper between different phases in the winding mounting slots, improves slot fill factor, and simplifies the stator assembly wiring process.
[0053] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0054] This application provides a stator assembly, with reference to... Figures 1-5 , Figure 1 A three-dimensional structural diagram of the stator assembly provided in the embodiments of this application. Figure 1 , Figure 2 This is a schematic diagram of the A-phase winding of the stator assembly provided in an embodiment of this application. Figure 3 This is a top view of the stator assembly provided in an embodiment of this application. Figure 4 This is a bottom view of the stator assembly provided in an embodiment of this application. Figure 5 This is a schematic diagram of the winding mounting slot of the stator assembly provided in the embodiment of this application; the stator assembly of the embodiment of this application is applicable to drive motors with a number of winding mounting slots of Q, a number of pole pairs of P, and a number of phases of m, wherein the number of slots per pole per phase is q = Q / (2Pm), and the pole pitch is τ = Q / (2P).
[0055] The stator assembly includes a stator core 100 and a multiphase winding. The inner peripheral wall of the stator core 100 has a plurality of winding mounting slots 101 distributed along its circumference. Each winding mounting slot 101 extends along the axial direction of the stator core 100. Each winding mounting slot 101 is provided with M layers of slots arranged radially along the stator core 100. The multiphase winding is set in the winding mounting slot 101 based on the M layers of slots, and the multiphase winding extends out of the winding mounting slot 101 along the axial direction of the stator core 100 to form a lead end 200 and a welding end 300. The lead end 200 includes a lead end 201 and a hairpin end 202.
[0056] The multiphase windings are arranged in the winding mounting slots 101 based on M-layer slots, so that the winding mounting slots 101 have M-layer conductors; the M-layer conductors are also arranged radially along the stator core 100. Each phase winding includes a parallel branches, a≤M / 2, M≧4 and is an even number.
[0057] Each parallel branch includes a first coil group, a second coil group, and a connecting wire. The first coil group includes a first positive coil, a first negative coil, and a first same-layer wire. The first same-layer wire is used to connect the first positive coil and the first negative coil. The first positive coil is wound sequentially from the first layer slot to the Mth layer slot with a first span along the circumference of the stator core 100 in a first direction (which can be clockwise along the circumference of the stator core 100), so that the first positive coil can traverse each layer slot. The first negative coil is wound sequentially from the Mth layer slot to the first layer slot with a first span along the circumference of the stator core 100 in a second direction (which can be counterclockwise along the circumference of the stator core 100, the second direction being opposite to the first direction), so that the first negative coil can traverse each layer slot. When the first positive coil is wound to the Mth layer slot, which is the end position of the first positive coil, the starting position of the first negative coil is also set in the Mth layer slot. The end position of the first positive coil and the starting position of the first negative coil are connected by the first same layer line with the second span. The end position of the first positive coil and the starting position of the first negative coil are adjacent and both the end position of the first positive coil and the starting position of the first negative coil are located in the Mth layer slot. In other words, the end position of the first positive coil and the starting position of the first negative coil are both located in the same layer slot.
[0058] The second coil group includes multiple second positive coils, multiple second negative coils, and multiple second same-layer wires. The multiple second positive coils are wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core 100 in a first direction (which can be clockwise along the circumference of the stator core 100) with a first span, so that the second positive coils can traverse each layer slot. The multiple second negative coils are wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core 100 in a second direction (which can be counterclockwise along the circumference of the stator core 100) with a first span, so that the second negative coils can traverse each layer slot. Multiple second-layer lines include a portion of second-layer lines and another portion of second-layer lines. When the first second positive coil is wound to the Mth layer slot, it is the end position of the first second positive coil. At this time, the starting position of the first second negative coil is also set in the Mth layer slot. The end position of the first second positive coil and the starting position of the first second negative coil are connected by a portion of the second-layer lines with a first span. The end position of the first second positive coil and the starting position of the first second negative coil are adjacent, and the end position of the first second positive coil and the starting position of the first second negative coil are both located in the Mth layer slot. That is to say, the end position of the first second positive coil and the starting position of the first second negative coil are both located in the same layer slot. When the first second reverse coil is wound from slot M to slot 1, it marks the end position of the first second reverse coil. At this time, the starting position of the second second positive coil is also set in slot 1. The end position of the first second reverse coil and the starting position of the second second positive coil are connected by another portion of the second layer wire with a first span. Furthermore, the end position of the first second reverse coil and the starting position of the second second positive coil are adjacent, and both are located in slot 1. In other words, the end position of the first second reverse coil and the starting position of the second second positive coil are located in the same layer of slots. The winding methods for the remaining second positive and second reverse coils are the same as described above.
[0059] The connecting line is used to connect adjacent first reverse coils and second positive coils, both located in the first layer slots, with a third span. That is, when the first reverse coil is wound from the Mth layer slot to the first layer slot, it is at the end position of the first reverse coil. At this time, the initial position of the first second positive coil is also located in the first layer slot. The connecting line connects the end position of the first reverse coil and the initial position of the first second positive coil with a third span, and the end position of the first reverse coil and the initial position of the first second positive coil are adjacent. Both the end position of the first reverse coil and the initial position of the first second positive coil are located in the first layer slot.
[0060] In this configuration, the M-layer conductors in each winding mounting slot 101 are all in phase. The first span is y1 = τ. The difference between the second span y2 and the first span y1 is 1. Here, a difference of 1 represents a difference of 1 in the number of winding mounting slots between the second span and the first span. This difference can be either the second span being one more winding mounting slot than the first span, i.e., y2 = τ + 1; or it can be the first span being one more winding mounting slot than the second span, i.e., y2 = τ - 1.
[0061] When the winding direction of the connecting wire is the same as the first direction, that is, when the connecting wire is wound along the circumference of the stator core in the first direction, the third span is: y3 = y2.
[0062] When the winding direction of the connecting wire is opposite to the first direction, that is, the connecting wire is wound in the second direction along the circumference of the stator core, the difference between the third span y3 and the first span y1 is 1 and the difference between the third span y3 and the second span y2 is 2. In other words, at this time, the number of winding mounting slots that differ between the third span and the first span is 1, and the number of winding mounting slots that differ between the third span and the second span is 2.
[0063] In this embodiment of the stator assembly, the inner peripheral wall of the stator core 100 is provided with a plurality of winding mounting slots 101 distributed circumferentially. Each winding mounting slot 101 is provided with M layers of slots arranged radially along the stator core 100. Multiphase windings are arranged in the winding mounting slots 101 based on the M layers of slots, so that the winding mounting slots 101 have M layers of conductors. Each parallel branch of each multiphase winding includes a first coil group, a second coil group, and a connecting wire. The first coil group includes a first positive coil, a first negative coil, and a first same-layer wire. A positive coil is wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core 100 in a first direction with a first span. A first negative coil is wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core 100 in a second direction with a first span. A first co-layer wire is used to connect adjacent first positive coils and first negative coils, both located in the Mth layer slot, with a second span. The second coil group includes multiple second positive coils, multiple second negative coils, and multiple second co-layer wires. The multiple second positive coils are wound sequentially from the Mth layer slot to the Mth layer slot with a first span. The stator core 100 is wound circumferentially from the first slot to the Mth slot in a first direction. Multiple second reverse coils are wound circumferentially from the Mth slot to the first slot in a second direction with a first span. A portion of the second-layer wires connect adjacent second positive and second reverse coils, both located in the Mth slot, with a first span. Another portion of the second-layer wires connect adjacent second positive and second reverse coils, both located in the first slot, with a first span. A connecting wire is used to connect adjacent second positive and second reverse coils, both located in the first slot, with a third span. The first reverse coil and the second positive coil are in each winding mounting slot 101. The M layers of conductors in each winding mounting slot 101 are all in phase, M ≥ 4 and are an even number. The first span is y1 = τ. The difference between the second span y2 and the first span y1 is 1. When the winding direction of the connecting wire is the same as the first direction, the third span is y3 = y2. When the winding direction of the connecting wire is opposite to the first direction, the difference between the third span y3 and the first span y1 is 1 and the difference between the third span y3 and the second span y2 is 2. The first direction and the second direction are opposite. Each parallel branch of each phase winding includes a first coil group and a second coil group. The first coil group and the second coil group are wound into the winding mounting slot according to the first span, second span, and third span, ensuring that each layer of conductors in each winding mounting slot 101 is in phase. This eliminates the need for insulating paper between different phases in the winding mounting slot 101, improves slot fill factor, simplifies the stator assembly wiring process, reduces insulation costs, and improves manufacturing efficiency.
[0064] At the same time, each parallel branch can traverse the arranged conductor slots, the magnetic circuits of each parallel branch winding are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.
[0065] In addition, the coil in this embodiment uses flat copper wire, and the bare copper slot fill factor of the flat copper wire can reach more than 60%, which is much higher than that of the bare copper slot fill factor of the round copper wire. The higher the slot fill factor, the lower the DC resistance of the winding can be when the number of slots remains unchanged, thereby reducing the copper loss of the motor, improving the efficiency of the motor, increasing the driving range of the electric vehicle, and reducing the cost of the powertrain.
[0066] In this embodiment, the first positive coil is wound M / 2 turns along the circumference of the stator core 100 in a first direction (which may be clockwise), and the first negative coil is wound M / 2 turns along the circumference of the stator core 100 in a second direction (which may be counterclockwise). Multiple second positive coils are wound two turns along the circumference of the stator core 100 in the first direction (which may be clockwise), and multiple second negative coils are wound one turn along the circumference of the stator core 100 in the second direction (which may be counterclockwise). Each turn traverses a portion of the conductor layers until all conductor layers have been traversed.
[0067] In this embodiment, the first layer of wire is wound around the stator core 100 in a first direction (which may be clockwise) along the circumference of the stator core 100. That is, the winding direction of the first layer of wire is the same as the winding direction of the first positive coil. The end position of the first positive coil, the starting position of the first layer of wire, and the starting position of the first negative coil are arranged sequentially in a clockwise direction. A portion of the second layer of wire is wound around the stator core 100 in a first direction (which may be clockwise) along the circumference of the stator core 100. That is, the winding direction of a portion of the second layer of wire is the same as the winding direction of the second positive coil. The end position of the second positive coil, a portion of the second layer of wire, and the starting position of the second negative coil are arranged sequentially in a clockwise direction. Another part of the second layer wire is wound in the second direction along the circumference of the stator core 100 (which can be in the counterclockwise direction along the circumference of the stator core 100). That is to say, the winding direction of the other part of the second layer wire is the same as the winding direction of the second reverse coil. The end position of the second reverse coil, the starting position of the other part of the second layer wire and the second positive coil are arranged in the counterclockwise direction in sequence.
[0068] In one possible embodiment of this application, the second span is y2 = τ + 1. If the connecting wire is wound along the circumference of the stator core 100 in the first direction (which may be clockwise along the circumference of the stator core 100), then the third span is y3 = τ + 1. In this case, the winding direction of the connecting wire is the same as the winding direction of the first positive coil.
[0069] If the connecting wire is wound in the second direction (which can be counterclockwise) along the circumference of the stator core 100, then the third span is: y3 = τ-1. At this time, the winding direction of the connecting wire is opposite to the winding direction of the first positive coil.
[0070] In another possible embodiment of this application, the second span is y2 = τ-1. If the connecting wire is wound along the circumference of the stator core 100 in the first direction (which may be clockwise along the circumference of the stator core 100), then the third span is y3 = τ-1. In this case, the winding direction of the connecting wire is the same as the winding direction of the first positive coil.
[0071] If the connecting wire is wound in the second direction (which can be counterclockwise) along the circumference of the stator core 100, then the third span is: y3=τ+1. At this time, the winding direction of the connecting wire is opposite to the winding direction of the first positive coil.
[0072] Figure 6 Schematic diagram of the lead wire connection structure of the stator assembly provided in the embodiments of this application Figure 1 In this embodiment, the leads of each phase winding are 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.
[0073] Figure 7 Schematic diagram of the lead wire connection structure of the stator assembly provided in the embodiments of this application Figure 2 In this embodiment of the application, the leads of each phase winding are 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.
[0074] Figure 8This is a schematic diagram of the structure of the first type of coil in the stator assembly provided in this application embodiment. In this application embodiment, the first coil group includes a first type of coil, which includes a first lead segment 401, a first bent segment 402, a first straight segment 403, a second bent segment 404, and a first welding segment 405. The first straight segment 403 is disposed in the winding mounting groove 101. The first lead segment 401 and the first bent segment 402 are located at one end of the first straight segment 403, and the second bent segment 404 and the first welding segment 405 are located at the other end of the first straight segment 403. One end and the other end of the first straight segment 403 are arranged opposite to each other along the axial direction of the stator core 100. The first bent segment 402 is used to connect the first lead segment 401 and the first straight segment 403, and the second bent segment 404 is used to connect the first welding segment 405 and the first straight segment 403. The first straight segment 403 is located between the first welding segment 405 and the first lead segment 401. The first welding segment 405 and the first lead segment 401 are arranged opposite each other along the axial direction of the stator core 100, and the first welding segment 405 and the first lead segment 401 extend out of the winding mounting groove 101 along the axial direction of the stator core 100.
[0075] The first type of coil mentioned above is used to be wound on the lead end, and the second coil group is the same as the first coil group, and may also include the first type of coil.
[0076] Figure 9 Schematic diagram of the structure of the second type of coil of the stator assembly provided in the embodiments of this application Figure 1 In the diagram, the third bend segment 504 and the fourth bend segment 505 are twisted in directions away from each other. Figure 10 Schematic diagram of the structure of the second type of coil of the stator assembly provided in the embodiments of this application Figure 2 In the diagram, the third bend segment 504 and the fourth bend segment 505 are both twisted in the direction of the third bend segment 504. Figure 11 Schematic diagram of the structure of the second type of coil of the stator assembly provided in the embodiments of this application Figure 3 In the diagram, the third bend segment 504 and the fourth bend segment 505 are both twisted in the direction of the fourth bend segment 505.
[0077] In this embodiment, the first coil group may further include a second type of coil. The second type of coil includes a second straight segment 502, a third straight segment 503, a hairpin segment 501, a third bent segment 504, a fourth bent segment 505, a second welding segment 506, and a third welding segment 507. The second straight segment 502 and the third straight segment 503 are parallel and are radially spaced along the stator core 100. Both the second straight segment 502 and the third straight segment 503 are disposed in the winding mounting slot 101. The two ends of the clip segment 501 are connected to the second straight segment 502 and the third straight segment 503, respectively; the third bent segment 504 is used to connect the second welded segment 506 and the second straight segment 502, and the fourth bent segment 505 is used to connect the third welded segment 507 and the third straight segment 503; the clip segment 501, the second welded segment 506 and the third welded segment 507 are arranged opposite each other along the axial direction of the stator core 100, and the clip segment 501, the second welded segment 506 and the third welded segment 507 all extend out of the winding mounting slot 101 along the axial direction of the stator core.
[0078] In the above embodiments of this application, the third bending segment 504 and the fourth bending segment 505 can be parallel to each other, and the third bending segment 504 and the fourth bending segment 505 can also be arranged opposite each other along the circumferential direction of the stator core 100.
[0079] Optionally, all multiphase windings are made of flat wire conductors. In other words, the first type of coil and the second type of coil mentioned above are both flat wire conductors. For example, the cross-section of the flat wire conductor is rectangular. This can improve the slot fill factor of the drive motor. With the slot position unchanged, the DC resistance of the winding can be reduced, the copper loss of the drive motor can be reduced, and the efficiency of the drive motor can be improved.
[0080] This application also provides a drive motor, which includes the stator assembly described above.
[0081] This application also provides a method for winding a stator assembly, used to prepare the stator assembly described above, which includes the following steps:
[0082] Step S1: Place the first positive coil in the first layer of the arbitrary winding mounting slot 101, and wind it M / 2 turns along the circumference of the stator core 100 in the first direction (clockwise) with a first span to reach the Mth layer of the arbitrary winding mounting slot 101.
[0083] The first positive coil is initially positioned when it is placed in the first layer of any winding mounting slot 101, and ends when it reaches the Mth layer of any winding mounting slot 101. The first positive coil traverses all slots.
[0084] The first span is: y1 = τ.
[0085] Step S2: Connect the first same-layer wire to the adjacent first positive coil and first negative coil, both located in the Mth layer slot, along the circumference of the stator core 100 in the first direction (clockwise) with the second span.
[0086] When the first positive coil is wound to the Mth layer slot, it is the end position of the first positive coil. At this time, the starting position of the first negative coil is also set in the Mth layer slot. The end position of the first positive coil and the starting position of the first negative coil are connected by the first same layer line with the second span. The end position of the first positive coil and the starting position of the first negative coil are adjacent and both the end position of the first positive coil and the starting position of the first negative coil are located in the same layer slot.
[0087] The difference between the second span y2 and the first span y1 is 1.
[0088] Step S3: The first reverse coil is wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core 100 in the second direction (counterclockwise) with the first span.
[0089] The first reverse coil is set at the Mth layer slot of any winding mounting slot 101, which is the initial position of the first reverse coil. When it reaches the first layer slot of any winding mounting slot 101, it is the end position of the first reverse coil. The first reverse coil traverses all slots.
[0090] Step S4: Connect the connecting wires to the adjacent first reverse coil and second positive coil, both located in the first layer slot, with a third span.
[0091] When the first reverse coil is wound from the Mth layer slot to the first layer slot, it is at the end position of the first reverse coil. At this time, the initial position of the second positive coil is also located in the first layer slot. The end position of the first reverse coil and the initial position of the second positive coil are connected by a connecting line with a third span, and the end position of the first reverse coil and the initial position of the second positive coil are adjacent to each other. Both the end position of the first reverse coil and the initial position of the second positive coil are located in the first layer slot.
[0092] The winding direction of the connecting wire can be the same as or opposite to the winding direction of the first reverse coil. When the winding direction of the connecting wire is the same as the winding direction of the first reverse coil, that is, when the winding direction of the connecting wire is the same as the second direction, the difference between the third span y3 and the first span y1 is 1, and the difference between the third span y3 and the second span y2 is 2. When the winding direction of the connecting wire is opposite to the winding direction of the first reverse coil, that is, when the winding direction of the connecting wire is the same as the first direction, the third span is: y3 = y2.
[0093] Step S5: The second positive coil is wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core 100 in the first direction (clockwise) with the first span, and the second positive coil is wound two turns.
[0094] Step S6: Connect a portion of the second same-layer wires to the adjacent second positive coil and second negative coil, both located in the slot of the Mth layer, with a first span.
[0095] Among them, the winding direction of some of the second same-layer wires is the same as the winding direction of the second positive coil, and the end position of the second positive coil, some of the second same-layer wires, and the beginning position of the second reverse coil are arranged in a clockwise direction.
[0096] Step S7: The second reverse coil is wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core 100 with the first span in the second direction (counterclockwise), and the second reverse coil is wound once.
[0097] Step S8: Connect the other part of the second layer wires to the adjacent second positive coil and second negative coil, which are both located in the first layer slot, with a first span.
[0098] The winding direction of the other part of the second layer wire is the same as that of the second reverse coil. The end position of the second reverse coil, the starting position of the other part of the second layer wire and the second positive coil are arranged in a counterclockwise direction.
[0099] S9. Repeat S5-S8 until the wire is wound out.
[0100] The stator assembly of this application will be described below with two embodiments. The stator assembly is applicable to a 6-pole, 54-slot, 3-phase motor (including A-phase winding, B-phase winding and C-phase winding). Each winding mounting slot includes 6 layers of flat wire conductors, the pole pitch τ = 9, the number of slots per pole per phase q = 3, and each phase winding includes 2 parallel branches.
[0101] The following describes some specific embodiments of the stator assembly of this application.
[0102] Example 1:
[0103] In this embodiment, the second span y2 = τ + 1, the connecting line is wound around the stator core 100 in the first direction along the circumference, and the span of the connecting line is y3 = τ + 1.
[0104] refer to Figures 12-15 , Figure 12 This is a schematic diagram of the A-phase winding as provided in Embodiment 1 of this application. Figure 13 This is a connection diagram of the first coil group of the first parallel branch provided in Embodiment 1 of this application. Figure 14 This is a connection diagram of the second coil group of the first parallel branch provided in Embodiment 1 of this application. Figure 15 This is a connection diagram of the first parallel branch provided in Embodiment 1 of this application. The connection diagrams of the first coil group and the second coil group, when combined, form... Figure 15 The diagram shows the connection of the first parallel branch.
[0105] Each winding mounting slot 101 includes six layers of conductors arranged radially along the stator core 100: layer a, layer b, layer c, layer d, layer e, and layer f. Figures 13-15 The horizontal axis in the figure refers to the 54 winding mounting slots, 101. Figures 13-15 The vertical axis in the figure refers to the 6-layer conductor.
[0106] When the first span y1 = 9, the second span y2 = 10, and the third span y3 = 10, the winding method of the first parallel branch A1X1 of phase A winding is as follows:
[0107] First coil group:
[0108] 1a→10b→19a→28b→37a→46b→1c→10d→19c→28d→37c→46d→1e→10f→19e→28f→37e→46f→2f→47e→38f→29e→20f→11e→2d→47c→38d→29c→20d→11c→2b→47a→38b→29a→20b→11a→
[0109] Second coil group:
[0110] 21a→30b→39c→48d→3e→12f→21f→12e→3d→48c→39b→30a→39a→48b→3c→12d→21e→30f→
[0111] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is the same as the winding direction of the flat wire conductor.
[0112] refer to Figure 16 , Figure 16 This is a connection diagram of the second parallel branch provided in Embodiment 1 of this application. Figure 16 The horizontal axis in the figure refers to the 54 winding mounting slots, 101. Figure 16 The vertical axis in the figure refers to the 6-layer conductor.
[0113] When the first span y1 = 9, the second span y2 = 10, and the third span y3 = 10, the winding method of the second parallel branch A2X2 of phase A winding is as follows: First coil group:
[0114] ←38a←47b←2a←11b←20a←29b←38c←47d←2c←11d←20c←29d←38e←47f←2e←11f←20e←29f←19f←10e←1f←46e←37f←28e←19d←10c←1d←46c←37d←28c←19b←10a←1b←46a←37b←28a
[0115] Second coil group:
[0116] ←3f←48e←39d←30c←21b←12a←3a←12b←21c←30d←39e←48f←39f←30e←21d←12c←3b←48a
[0117] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is opposite to the winding direction of the flat wire conductor.
[0118] Example 2:
[0119] In this embodiment, the second span y2 = τ + 1, the connecting wire is wound around the stator core 100 in the second direction along the circumference, and the span of the connecting wire is y3 = τ - 1.
[0120] refer to Figure 17 , Figure 17 This is a connection diagram of the first parallel branch provided in Embodiment 2 of this application. Figure 17 The horizontal axis in the figure refers to the 54 winding mounting slots, 101. Figure 17 The vertical axis in the figure refers to the 6-layer conductor.
[0121] When the first span y1 = 9, the second span y2 = 10, and the third span y3 = 8, the winding method of the first parallel branch A1X1 of phase A winding is as follows:
[0122] First coil group:
[0123] 1a→10b→19a→28b→37a→46b→1c→10d→19c→28d→37c→46d→1e→10f→19e→28f→37e→46f→2f→47e→38f→29e→20f→11e→2d→47c→38d→29c→20d→11c→2b→47a→38b→29a→20b→11a→
[0124] Second coil group:
[0125] 3a→12b→21c→30d→39e→48f→39f→30e→21d→12c→3b→48a→39a→48b→3c→12d→21e→30f→
[0126] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is the same as the winding direction of the flat wire conductor.
[0127] refer to Figure 18 , Figure 18 This is a connection diagram of the second parallel branch provided in Embodiment 2 of this application; Figure 18 The horizontal axis in the figure refers to the 54 winding mounting slots, 101. Figure 18 The vertical axis in the figure refers to the 6-layer conductor.
[0128] When the first span y1 = 9, the second span y2 = 10, and the third span y3 = 8, the winding method of the second parallel branch A2X2 of phase A winding is as follows:
[0129] First coil group:
[0130] ←38a←47b←2a←11b←20a←29b←38c←47d←2c←11d←20c←29d←38e←47f←2e←11f←20e←29f←19f←10e←1f←46e←37f←28e←19d←10c←1d←46c←37d←28c←19b←10a←1b←46a←37b←28a
[0131] Second coil group:
[0132] ←3f←48e←39d←30c←21b←12a←21a←30b←39c←48d←3e←12f←21f←12e←3d←48c←39b←30a
[0133] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is opposite to the winding direction of the flat wire conductor.
[0134] Example 3:
[0135] In this embodiment, the second span y2 = τ-1, the connecting line is wound around the stator core 100 in the first direction along the circumference, and the span of the connecting line is y3 = τ-1.
[0136] refer to Figures 19-22 , Figure 12 This is a schematic diagram of the A-phase winding as provided in Embodiment 1 of this application. Figure 13 This is a connection diagram of the first coil group of the first parallel branch provided in Embodiment 3 of this application. Figure 14 This is a connection diagram of the second coil group of the first parallel branch provided in Embodiment 3 of this application. Figure 15 This is a connection diagram of the first parallel branch provided in Embodiment 3 of this application. The connection diagrams of the first coil group and the second coil group, when combined, form... Figure 15 The diagram shows the connection of the first parallel branch.
[0137] Each winding mounting slot 101 includes six layers of conductors arranged radially along the stator core 100: layer a, layer b, layer c, layer d, layer e, and layer f. Figures 20-22 The horizontal axis refers to the 54 winding mounting slots, 101. Figures 20-22 The vertical axis in the figure refers to the 6-layer conductor.
[0138] When the first span y1 = 9, the second span y2 = 8, and the third span y3 = 8, the winding method of the first parallel branch A1X1 of phase A winding is as follows:
[0139] First coil group:
[0140] 3a→12b→21a→30b→39a→48b→3c→12d→21c→30d→39c→48d→3e→12f→21e→30f→39e→48f→2f→47e→38f→29e→20f→11e→2d→47c→38d→29c→20d→11c→2b→47a→38b→29a→20b→11a→
[0141] Second coil group:
[0142] 19a→28b→37c→46d→1e→10f→19f→10e→1d→46c→37b→28a→37a→46b→1c→10d→19e→28f→
[0143] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is the same as the winding direction of the flat wire conductor.
[0144] refer to Figure 23 , Figure 23 This is a connection diagram of the second parallel branch provided in Embodiment 3 of this application. Figure 23 The horizontal axis in the figure refers to the 54 winding mounting slots, 101. Figure 23 The vertical axis in the figure refers to the 6-layer conductor.
[0145] When the first span y1 = 9, the second span y2 = 8, and the third span y3 = 8, the winding method of the second parallel branch A2X2 of phase A winding is as follows:
[0146] First coil group:
[0147] ←38a←47b←2a←11b←20a←29b←38c←47d←2c←11d←20c←29d←38e←47f←2e←11f←20e←29f←21f←12e←3f←48e←39f←30e←21d←12c←3d←48c←39d←30c←21b←12a←3b←48a←39b←30a
[0148] Second coil group:
[0149] ←1f←46e←37d←28c←19b←10a←1a←10b←19c←28d←37e←46f←37f←28e←19d←10c←1b←46a
[0150] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is opposite to the winding direction of the flat wire conductor.
[0151] Example 4:
[0152] In this embodiment, the second span y2 = τ-1, the connecting wire is wound around the stator core 100 in the second direction along the circumference, and the span of the connecting wire is y3 = τ+1.
[0153] refer to Figure 24 , Figure 24 This is a connection diagram of the first parallel branch provided in Embodiment 4 of this application. Figure 24 The horizontal axis in the figure refers to the 54 winding mounting slots, 101. Figure 24 The vertical axis in the figure refers to the 6-layer conductor.
[0154] When the first span y1 = 9, the second span y2 = 8, and the third span y3 = 10, the winding method of the first parallel branch A1X1 of phase A winding is as follows:
[0155] First coil group:
[0156] 3a→12b→21a→30b→39a→48b→3c→12d→21c→30d→39c→48d→3e→12f→21e→30f→39e→48f→2f→47e→38f→29e→20f→11e→2d→47c→38d→29c→20d→11c→2b→47a→38b→29a→20b→11a→
[0157] Second coil group:
[0158] 1a→10b→19c→28d→37e→46f→37f→28e→19d→10c→1b→46a→37a→46b→1c→10d→19e→28f→
[0159] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is the same as the winding direction of the flat wire conductor.
[0160] refer to Figure 25 , Figure 25 This is a connection diagram of the second parallel branch provided in Embodiment 4 of this application; Figure 25 The horizontal axis in the figure refers to the 54 winding mounting slots, 101. Figure 25 The vertical axis in the figure refers to the 6-layer conductor.
[0161] When the first span y1 = 9, the second span y2 = 8, and the third span y3 = 10, the winding method of the second parallel branch A2X2 of phase A winding is as follows:
[0162] First coil group:
[0163] ←38a←47b←2a←11b←20a←29b←38c←47d←2c←11d←20c←29d←38e←47f←2e←11f←20e←29f←21f←12e←3f←48e←39f←30e←21d←12c←3d←48c←39d←30c←21b←12a←3b←48a←39b←30a
[0164] Second coil group:
[0165] ←1f←46e←37d←28c←19b←10a←19a←28b←37c←46d←1e←10f←19f←10e←1d←46c←37b←28a
[0166] The arrows above are used to illustrate the direction of current in the conductor of the winding, and the direction of the arrows is opposite to the winding direction of the flat wire conductor.
[0167] refer to Figure 26 , Figure 26 This is a schematic diagram of the winding phase distribution of the stator assembly in the above embodiments 1-4 of this application. Each winding mounting slot 101 in the figure has 6 layers of conductors, and the 6 layers of conductors in the same winding mounting slot 101 are all in the same phase.
[0168] It should be noted that in the above four embodiments, the winding method of phase B and phase C is the same as that of phase A. The phase B winding can be 120° out of phase with respect to phase A. That is, phase B winding can be shifted by 2q slots relative to phase A winding, and phase C winding can be shifted by 4q slots.
[0169] In summary, the stator assembly, drive motor, and stator assembly winding method provided in this application embodiment have multiple winding mounting slots 101 distributed circumferentially on the inner peripheral wall of the stator core 100 of the stator assembly. Each winding mounting slot 101 is provided with M layers of slots arranged radially along the stator core 100. Multiphase windings are arranged in the winding mounting slots 101 based on the M layers of slots, so that the winding mounting slots 101 have M layers of conductors. Each parallel branch of each multiphase winding includes a first coil group, a second coil group, and connecting wires. The second coil group includes a first positive coil, a first negative coil, and a first layer wire. The first positive coil is wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core 100 in a first direction with a first span. The first negative coil is wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core 100 in a second direction with a first span. The first layer wire is used to connect adjacent first positive coils and first negative coils, both located in the Mth layer slot, with a second span. The second coil group includes multiple second positive coils, multiple second negative coils, and multiple second layer wires. The coils are wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core 100 in a first direction with a first span. Multiple second reverse coils are wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core 100 in a second direction with a first span. A portion of the second same-layer wires connect adjacent second positive and second reverse coils, both located in the Mth layer slot, with a first span. Another portion of the second same-layer wires connect adjacent second positive and second reverse coils, both located in the first layer slot, with a first span. Connecting wires are used to connect adjacent second positive and second reverse coils with a third span. The first reverse coil and the second positive coil are both located in the first layer slot; wherein, the M layer conductors in each winding mounting slot 101 are all in phase, M≧4 and are an even number; the first span is: y1=τ; the difference between the second span y2 and the first span y1 is 1; when the winding direction of the connecting wire is the same as the first direction, the third span is: y3=y2; when the winding direction of the connecting wire is opposite to the first direction, the difference between the third span y3 and the first span y1 is 1 and the difference between the third span y3 and the second span y2 is 2; the first direction and the second direction are opposite. Each parallel branch of each phase winding includes a first coil group and a second coil group. The first coil group and the second coil group are wound into the winding mounting slot according to the first span, the second span and the third span, ensuring that each layer of conductors in each winding mounting slot 101 is in phase. This eliminates the need for insulating paper between different phases in the winding mounting slot 101, improves the slot fill factor, simplifies the stator assembly wiring process, reduces insulation costs and improves manufacturing efficiency.
[0170] Furthermore, each parallel branch can traverse the arranged conductor slots, the magnetic circuits of each parallel branch winding are completely symmetrical, the potentials of each parallel branch remain balanced, and there is no circulating current between branches.
[0171] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
[0172] 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.
[0173] 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.
[0174] 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).
[0175] 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 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.
[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 therein. Such 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 this application.
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 has multiple winding mounting slots distributed circumferentially. Each winding mounting slot has M layers of slots for conductor wiring. The M layers of slots are arranged radially along the stator core. The multiphase windings are arranged in the winding mounting slots based on the M layers of slots, so that the winding mounting slots have M layers of conductors, where M is an even number. Each phase of the winding includes at least two parallel branches, and the number N of parallel branches in each phase of the winding satisfies: N≤M / 2. Each of the branches includes a first coil group, a second coil group, and a connecting wire. The first coil group includes a first positive coil, a first negative coil, and a first in-layer wire. The first positive coil is wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core in a first direction with a first span. The first negative coil is wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core in a second direction with the first span. The first in-layer wire is used to connect the adjacent first positive coil and first negative coil, both located in the Mth layer slot, with a second span. The second coil group includes a plurality of second positive coils, a plurality of second negative coils, and a plurality of second same-layer wires. The plurality of second positive coils are wound sequentially from the first layer slot to the Mth layer slot along the circumference of the stator core in a first direction with a first span. The plurality of second negative coils are wound sequentially from the Mth layer slot to the first layer slot along the circumference of the stator core in a second direction with a first span. A portion of the second same-layer wires connect adjacent second positive coils and second negative coils, both located in the Mth layer slot, with a first span. Another portion of the second same-layer wires connect adjacent second positive coils and second negative coils, both located in the first layer slot, with a first span. The connecting line is used to connect the first reverse coil and the second positive coil, which are both located in the first layer slot, with a third span; Wherein, the M-layer conductors in each of the winding mounting slots are in phase; the first span is: y1 = τ; the difference between the second span y2 and the first span y1 is 1; when the winding direction of the connecting wire is the same as the first direction, the third span is: y3 = y2; when the winding direction of the connecting wire is opposite to the first direction, the difference between the third span y3 and the first span y1 is 1 and the difference between the third span y3 and the second span y2 is 2; the first direction and the second direction are opposite.
2. The stator assembly according to claim 1, characterized in that, The first positive coil is wound M / 2 turns along the circumference of the stator core in the first direction, and the first negative coil is wound M / 2 turns along the circumference of the stator core in the second direction. The plurality of second positive coils are wound two turns around the stator core in the first direction, and the plurality of second negative coils are wound one turn around the stator core in the second direction.
3. The stator assembly according to claim 1, characterized in that, The first layer wire is wound around the stator core in the first direction along the circumference of the stator core, a portion of the second layer wire is wound around the stator core in the first direction along the circumference of the stator core, and another portion of the second layer wire is wound around the stator core in the second direction along the circumference of the stator core.
4. The stator assembly according to claim 1, characterized in that, The second span is y2 = τ + 1; If the connecting line is wound around the stator core in the first direction along the circumference, the third span is: y3=τ+1; If the connecting line is wound around the stator core in the second direction along the circumference, the third span is: y3 = τ-1.
5. The stator assembly according to claim 1, characterized in that, The second span is y2 = τ - 1; If the connecting line is wound around the stator core in the first direction along the circumference, the third span is: y3 = τ-1; If the connecting line is wound around the second direction along the circumference of the stator core, the third span is: y3 = τ + 1.
6. The stator assembly according to claim 1, characterized in that, The leads of each phase winding are connected together to form a star connection; or the leads of each phase winding are connected end to end to form a triangle connection.
7. The stator assembly according to claim 1, characterized in that, The first coil group includes a first type of coil, which includes a first lead segment, a first welding segment, and a first straight segment. The first straight segment is located between the first welding segment and the first lead segment and is disposed in the winding mounting slot. The first welding segment and the first lead segment are disposed opposite each other along the axial direction of the stator core and extend out of the winding mounting slot along the axial direction of the stator core.
8. The stator assembly according to claim 1, characterized in that, The first coil group includes a second type of coil, which includes a second straight segment, a third straight segment, a hairpin segment, a second welding segment, and a third welding segment. The second straight segment and the third straight segment are parallel and are arranged at a distance along the radial direction of the stator core. Both the second straight segment and the third straight segment are arranged in the winding mounting slot. The two ends of the hairpin segment are respectively connected to the second straight segment and the third straight segment; The second welded segment is connected to the second straight segment, and the third welded segment is connected to the third straight segment; The hairpin section and the second welding section are arranged opposite to the third welding section along the axial direction of the stator core, and the hairpin section, the second welding section and the third welding section all extend out of the winding mounting slot along the axial direction of the stator core.
9. The stator assembly according to any one of claims 1-8, characterized in that, All the multiphase windings are made of flat wire conductors.
10. A drive motor, characterized in that, Includes the stator assembly as described in any one of claims 1-9.