Winding method, winding device, motor stator, drive motor and vehicle

Abstract

The application discloses a winding method, a winding device, a motor stator, a driving motor and a vehicle. The winding coil of the winding of the motor stator is formed by m wires and n turns. The winding method comprises the following steps: according to the number m of the wires of the winding coil and the number n of turns of each wire, the winding coil is grouped and fixed to obtain p groups of coils, wherein when n > m >= 1, the number n of turns of each wire of the winding coil is grouped, and when 1 < n < m, the number m of the wires of the winding coil is grouped; and the p groups of coils are wired into the stator slot of the motor stator. According to the winding method, the number of the parallel winding wires or the number of turns of each winding coil is reduced, the tightness of the parallel winding wires is consistent, the distribution of the wires in the stator slot is more uniform, the length deviation between the multiple wires is reduced, the resistance deviation and the potential difference are reduced, the circulating current and the temperature rise are reduced, and the performance of the motor is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a winding method, a winding device, a motor stator, a drive motor, and a vehicle. Background Technology

[0002] In related technologies, motors are wound with multiple strands of wire in parallel. The tension of the multiple strands is inconsistent, making winding difficult. In addition, the potential on each conductor is different, forming a circulating current, which leads to a large temperature rise and affects the performance of the motor. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a winding method for a motor stator that reduces circulating current, lowers temperature rise, and improves motor performance.

[0004] The present invention also proposes a winding device for a motor stator that performs the above-described winding method.

[0005] The present invention also proposes a motor stator that uses the above-described winding method.

[0006] The present invention also proposes a drive motor having the above-mentioned motor stator.

[0007] The present invention also proposes a vehicle having the above-mentioned drive motor.

[0008] According to an embodiment of the present invention, a winding method for a motor stator is provided, wherein the winding coil of the motor stator is formed by m wires wound with n turns. The winding method includes: grouping each winding coil into groups and fixing them to obtain p groups of coils, wherein when n > m ≥ 1, the number of turns n of each wire of the winding coil is grouped, and when 1 < n < m, the number of wires m of the winding coil is grouped; and the p groups of coils are then unwound into the stator slots of the motor stator.

[0009] According to the stator winding method of the present invention, each winding coil is grouped according to the number of wires and the number of turns of each wire, and each group is fixed after winding to form multiple groups of coils. This reduces the number of wires or turns wound in parallel for each winding, making the multiple wires wound in parallel with consistent tension, simplifying the winding process, and making the wire distribution in the stator slots more neat and uniform. This reduces the length deviation between multiple wires, reduces resistance deviation, makes the potential on the conductors closer, reduces the generation of circulating current, thereby helping to reduce temperature rise and improve motor performance.

[0010] In addition, the motor stator winding method according to the above embodiments of the present invention may also have the following additional technical features:

[0011] According to some embodiments of the present invention, when n > m ≥ 1, n = Ap + B, wherein one group of the coils includes m wires wound around A + B turns, and the remaining groups of the coils each include m wires wound around A turns, where A and B are both integers, A > 0, 0 ≤ B < p.

[0012] According to some embodiments of the present invention, n / 4 ≤ p ≤ n.

[0013] According to some embodiments of the present invention, when 1 < n < m, m = Cp + D, wherein one group of the coils includes C + D wires wound with n turns, and the remaining groups of the coils each include C wires wound with n turns, where C and D are both integers, C > 0, and 0 ≤ D < p.

[0014] According to some embodiments of the present invention, m / 5 ≤ p < m.

[0015] According to some embodiments of the present invention, each group of coils includes a first layer edge, a second layer edge, and a connecting portion connecting the first layer edge and the second layer edge. The step of winding p groups of coils into the stator slots of the motor stator includes: numbering the p groups of coils according to the winding sequence; winding the first layer edge of the p groups of coils into one of the stator slots in the order 1, 2, ..., p groups, and winding the second layer edge into another stator slot in the order e+2, e+3, ..., p, 1, ..., e+1 groups; or, winding the first layer edge into one of the stator slots in the order p, p-1, ..., 1 groups, and winding the second layer edge into another stator slot in the order p-1-e, p-2-e, ..., 1, p, ..., pe groups, where 0 ≤ e < p-1.

[0016] According to some embodiments of the present invention, e = 0.

[0017] According to some embodiments of the present invention, the winding of the motor stator has multiple parallel branches, each of the parallel branches includes multiple winding coils connected in series, each group of coils includes a first layer side, a second layer side, and a connecting portion connecting the first layer side and the second layer side, and in the parallel branches, the winding order of the first layer side of two adjacent winding coils is opposite.

[0018] According to some embodiments of the present invention, in two adjacent winding coils of the parallel branch, the first layer edge and the second layer edge of one winding coil are located on the side close to each other of the first layer edge and the second layer edge of the other winding coil; or, the first layer edge and the second layer edge of one winding coil are respectively located on the same side of the first layer edge and the second layer edge of the other winding coil.

[0019] According to some embodiments of the present invention, each group of coils is wrapped with an insulating material before the p groups of coils are laid into the stator slots.

[0020] A motor stator winding device according to an embodiment of the present invention is used to perform a motor stator winding method according to an embodiment of the present invention.

[0021] According to an embodiment of the present invention, the motor stator is wound using a winding method according to an embodiment of the present invention.

[0022] The drive motor according to an embodiment of the present invention includes a motor stator according to an embodiment of the present invention.

[0023] The vehicle according to an embodiment of the present invention includes a drive motor according to an embodiment of the present invention.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic flowchart of a winding method according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic flowchart of a winding method according to some specific embodiments of the present invention;

[0028] Figure 3 This is a schematic diagram of the lowering of multiple sets of coils in a stator slot according to some embodiments of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of a coil according to some embodiments of the present invention;

[0030] Figure 5 This is a schematic diagram showing the distribution of two adjacent winding coils in a parallel branch according to some embodiments of the present invention;

[0031] Figure 6This is a schematic diagram showing the distribution of two adjacent winding coils in a parallel branch according to some embodiments of the present invention;

[0032] Figure 7 This is a schematic diagram of the lower wire of a wound coil according to some embodiments of the present invention;

[0033] Figure 8 This is a schematic diagram of the lower wires of two wound coils according to some embodiments of the present invention;

[0034] Figure 9 This is a schematic diagram of the lower wires of two wound coils according to some embodiments of the present invention;

[0035] Figure 10 This is a schematic diagram of a vehicle according to an embodiment of the present invention.

[0036] Figure label:

[0037] Motor stator 100; drive motor 2000; vehicle 3000;

[0038] Stator core 10; stator slot 101;

[0039] 20 winding coil; 21 coil; 22 first layer edge; 23 second layer edge; 24 connecting part;

[0040] Insulating component 30. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] In the description of this invention, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "above," "over," and "on top" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0044] The winding method of the motor stator 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0045] Reference Figures 1-3 As shown, the winding coil 20 of the motor stator 100 can be wound by multiple strands of wire in parallel instead of the traditional single thick round wire winding method. For example, the winding coil 20 can be formed by m wires (such as copper wire, including but not limited to round wire) and wound in parallel with n turns, so that the motor stator 100 has the advantages of simple processing technology, low cost, and flexible adjustment.

[0046] In addition, such as Figures 1-3 As shown, the winding method of the motor stator 100 according to an embodiment of the present invention may include the following steps:

[0047] Step S1: Based on the number of wires m and the number of turns n of each wire in the winding coil 20, each winding coil 20 is grouped and wound and fixed to obtain p groups of coils 21. When n > m ≥ 1, the number of turns n of each wire in the winding coil 20 is grouped. When 1 < n < m, the number of wires m in the winding coil 20 is grouped.

[0048] Specifically, each winding coil 20 is divided into p groups for winding. After each group is wound, it is fixed separately, resulting in p groups of coils 21. The m wires in the p groups of coils 21 are connected in parallel, and each wire is wound with n turns to form a winding structure of m wires wound with n turns. This reduces AC resistance, skin effect, and proximity effect. Especially in high-speed and high-frequency applications, the grouped winding method can reduce the AC resistance of the motor, reduce the skin effect and proximity effect caused by the high-frequency AC magnetic field, and make the AC current distribution in each wire uniform, avoiding increased performance degradation.

[0049] Step S2: Unwire the p group of coils 21 into the stator slot 101 of the motor stator 100.

[0050] It should be noted that the motor stator winding includes multiple parallel branches, each of which includes multiple series-connected winding coils 20. In embodiments where multiple winding coils 20 are wound in groups, the winding order of the multiple group-wound winding coils 20 can be the same or different. For example, multiple winding coils 20 can be wound in the winding order of group p coils 21. As another example, multiple winding coils 20 can be wound with at least one shift in their winding order according to group p coils 21; specifically, one of the series-connected winding coils 20 can be wound in the order of groups 1, 2, 3, ..., p, while the other series-connected winding coil 20 can be wound in the order of groups 2, 3, ..., p, 1. All of these are within the scope of protection of this invention.

[0051] For motors with multiple strands of wire wound in parallel, if the tension of the multiple strands is inconsistent, it will lead to winding difficulties and deviations in the length of each wire, resulting in deviations in the resistance of individual wires. Furthermore, the final position of the multiple strands wound in the slot cannot be determined or accurately controlled. The positions of multiple conductors in a single-turn coil are far apart in the slot. Due to the influence of slot flow, the potential on each conductor is different, forming a circulating current, generating a large temperature rise, and affecting the performance of the motor.

[0052] In embodiments of the present invention, by grouping the structure of the winding coil 20 with m wires wound in parallel and n turns, the number of wires wound in parallel (i.e., the number of wires included in each coil 21) or the number of turns wound in parallel (i.e., the number of turns wound on each wire in each coil 21) is reduced in each winding of the coil 21. This results in a more uniform and neat distribution of wires in the stator slot 101 after multiple groups of coils 21 are wound into the stator slot 101 of the stator core 10 of the motor stator 100. The tension of the multiple strands of wires wound in parallel is more consistent, making winding easier and reducing the length deviation between multiple wires, thereby reducing the resistance deviation between multiple wires. In addition, the final position of the multiple strands of wires wound in parallel in the stator slot 101 is easier to determine and accurately control, reducing magnetic leakage inductance, making the potentials on multiple wires closer, reducing the generation of circulating current, reducing temperature rise, and improving the continuous external characteristics and peak external characteristics of the motor.

[0053] Furthermore, in the embodiments of the present invention, the winding coil 20 is grouped according to the number of wires and the number of turns of each wire, that is, according to the size of m and n, so as to achieve targeted grouping, the grouping is more reasonable, and can meet the needs of different situations and reduce the circulating current to a greater extent.

[0054] For example, in some embodiments, such as Figure 2As shown, n > m ≥ 1, the number of turns wound on each wire of the winding coil 20 is grouped. For example, n turns of m wires wound in parallel are divided into p groups, and each group of coils 21 includes m wires wound in parallel with n1 turns, where n1 is less than n. With this method, after each group of coils 21 is sequentially unwound into the stator slot 101, the m wires wound in parallel in each group of coils 21 are more concentrated in the stator slot 101, and the conductors in the stator slot 101 are more evenly and uniformly distributed. This can reduce the potential difference between the parallel conductors in a single group of coils 21, thereby reducing the circulating current.

[0055] In other embodiments, such as Figure 2 As shown, 1 < n < m, the number of wires in the winding coil 20 is grouped. For example, m wires are divided into p groups, and each group of coils 21 includes m1 wires wound with n turns, where m1 is less than m. In this method, the magnitude and phase of the potential difference between each wire are relatively fixed, which makes it easier to reduce the combined potential difference between the parallel conductors in the winding coil 20 by replacing multiple groups of coils 21, thereby reducing the circulating current.

[0056] It should be noted that the present invention does not impose any special restrictions on the fixing method of each group of coils 21. For example, each group of coils 21 can be fixed by a specific tooling to make the fixing more reliable and the fixing tightness of multiple groups of coils 21 more consistent.

[0057] The following describes a grouping method for multiple wires wound in parallel according to some embodiments of the present invention.

[0058] In some embodiments of the present invention, when n > m ≥ 1, step S1: Based on the number of wires m and the number of turns n of each wire in the winding coil 20, each winding coil 20 is grouped and wound and fixed to obtain p groups of coils 21. Specifically, this may include: dividing the number of turns n of each wire in each winding coil 20 into p groups for winding and fixing to obtain p groups of coils. Wherein, n = Ap + B, in the p groups of coils 21, one group of coils 21 includes m wires and wound A + B turns, and the remaining groups of coils 21 each include m wires and wound A turns, where A and B are integers, A > 0, 0 ≤ B < p.

[0059] When n is greater than m, the number of conductor turns in the multi-strand wound coil 20 is relatively large, which is more likely to cause problems such as inconsistent tightness. By grouping the turns, the number of turns of the conductors wound in each group of coils 21 is reduced, and each group of coils 21 is fixed, thereby improving the consistency of tightness. In addition, the m conductors wound in each coil 21 are more concentrated in the stator slot 101, making the conductor distribution in the stator slot 101 more neat and uniform, thereby reducing the potential difference between the conductors wound in a single coil 21 and reducing circulating current.

[0060] For example, such as Figure 2 and Figure 3 As shown, after dividing the n turns of the wound coil 20 into p groups, they can be numbered 1, 2, 3, ..., p. If n is divisible by p, i.e., B = 0, each group of coils 21 includes n / p turns; if n is not divisible by p, then the first 1, 2, 3, ..., (p-1) groups of coils 21 can each include A turns, i.e., n / p rounded down, and the p-th group is (n-(p-1)*A), i.e., A+B turns. When winding the coil 21, after each group is wound, the group of coils 21 is fixed with a fixture and numbered. After winding n turns of coil 21, the n turns of coil 21 are sequentially unwound into the stator slot 101 in the order of 1, 2, 3, ..., p. The entire winding process is more orderly.

[0061] In some embodiments, the number of groups and the number of turns n of each wire of the winding coil 20 satisfy n / 4 ≤ p ≤ n. Within the above range, the number of groups is sufficiently large to ensure the effect of reducing circulating current and limiting the reduction of motor temperature rise.

[0062] In some embodiments of the present invention, when 1 < n < m, step S1: Based on the number of wires m and the number of turns n of each wire in the winding coil 20, each winding coil 20 is grouped and wound and fixed to obtain p groups of coils 21. Specifically, this may include: dividing the number of wires m of each winding coil 20 into p groups for winding and fixing to obtain p groups of coils. Wherein, m = Cp + D, in the p groups of coils 21, one group of coils 21 includes C + D wires and n turns, and the remaining groups of coils 21 each include C wires and n turns, where C and D are integers, C > 0, 0 ≤ D < p.

[0063] When m is greater than n, the large number of conductors in the multi-strand wound coil 20 makes it easier to cause problems such as inconsistent tightness. By grouping the conductors, the number of conductors in each group of coils 21 is reduced, and each group of coils 21 is fixed, thereby improving the consistency of tightness. Although the conductors in each group of coils 21 are relatively dispersed in the stator slot 101, the potential difference and phase between each conductor are relatively fixed due to the grouping of the multi-stranded conductors. This is beneficial to reduce the combined potential difference between the multi-stranded conductors in the wound coil 20 by changing the coil 21, thereby reducing the circulating current.

[0064] For example, such as Figure 2 and Figure 3As shown, after dividing the m wires of the wound coil 20 into p groups, they can be numbered 1, 2, 3, ..., p. If m is divisible by p, i.e., D = 0, each group of coils 21 includes m / p wires; if m is not divisible by p, then the first 1, 2, 3, ..., (p-1) groups of coils 21 can each include C wires, i.e., m / p rounded down, and the p-th group is (m - (p-1) * C), i.e., C + D wires. When winding the coils 21, each group of coils 21 is fixed with a fixture and numbered. After winding p groups of coils 21, the coils 21 are sequentially unwound into the stator slots 101 in the order of 1, 2, 3, ..., p. The entire winding process is more orderly.

[0065] In some embodiments, the number of groups and the number of wires satisfy m / 5 ≤ p < m. Within the above range, the number of groups is sufficiently large to ensure the effect of reducing circulating current and limiting the reduction of motor temperature rise.

[0066] According to the winding method of the motor stator 100 of the present invention, each winding coil 20 is grouped according to the number of wires and the number of turns of each wire, and each group is fixed after winding to form multiple groups of coils 21. This reduces the number of wires or turns wound in parallel for each winding of the coil 21, making the tension of the multiple wires wound in parallel consistent, simplifying the winding process, and making the distribution of wires in the stator slot 101 more neat and uniform. This reduces the length deviation between multiple wires, reduces the resistance deviation, makes the potential on the conductors closer, reduces the generation of circulating current, thereby helping to reduce the temperature rise and improve the performance of the motor.

[0067] The following describes, with reference to the accompanying drawings, a method for unwinding multiple sets of coils 21 according to some embodiments of the present invention.

[0068] In some embodiments of the present invention, such as Figures 4-6 As shown, each coil 21 includes a first layer edge 22, a second layer edge 23, and a connecting portion 24, which connects the first layer edge 22 and the second layer edge 23. After the coil 21 is lowered into the stator slot 101, both the first layer edge 22 and the second layer edge 23 are located within the stator slot 101, and the connecting portion 24 is located at the axial end of the stator core 10 to connect the corresponding first layer edge 22 and second layer edge 23.

[0069] For multiple sets of coils 21 of the same wound coil 20, the winding sequence of the first layer edge 22 and the second layer edge 23 can be the same or staggered by several groups of numbers. For example, the first layer edge 22 of multiple sets of coils 21 can be wound into one stator slot 101 in the order of groups 1, 2, 3, ..., p, and the second layer edge 23 of multiple sets of coils 21 can also be wound into another stator slot 101 in the order of groups 1, 2, 3, ..., p. Alternatively, the first layer edge 22 of multiple sets of coils 21 can be wound into one stator slot 101 in the order of groups 2, 3, ..., p, 1, and the second layer edge 23 of multiple sets of coils 21 can also be wound into another stator slot 101 in the order of groups 2, 3, ..., p, 1.

[0070] For example, such as Figure 7 As shown, for multiple sets of coils 21 of the same winding coil 20, step S2: unwinding the p sets of coils 21 into the stator slots 101 of the motor stator 100, may specifically include:

[0071] Step S21: Number the p group coils 21 according to the winding sequence;

[0072] Specifically, taking the division of n turns of the wound coil 20 into p groups, where n is not divisible by p, as an example, m wires are wound together, A turns are wound and then fixed, and the resulting coil 21 is numbered as group 1; another A turns are wound and then fixed, and the resulting coil 21 is numbered as group 2; this process is repeated until the p-1th group is completed; the remaining wires are wound A+B turns and then fixed, and the resulting coil 21 is numbered as group p. Thus, the winding and numbering of group p coils 21 is completed. More orderly winding and numbering makes subsequent wire transposition more accurate.

[0073] Step S22: The first layer edge 22 of the p group coil 21 is wired into one of the stator slots 101 in the order of 1, 2, ..., p groups, and the second layer edge 23 is wired into another stator slot 101 in the order of e+2, e+3, ..., p, 1, ..., e+1 groups; or, the first layer edge 22 is wired into one of the stator slots 101 in the order of p, p-1, ..., 1 groups, and the second layer edge 23 is wired into another stator slot 101 in the order of p-1-e, p-2-e, ..., 1, p, ..., pe groups, where -1≤e<p-1.

[0074] In other words, the second layer edge 23 of the p-group coil 21 is staggered from the first layer edge 22 by several sets of numbers when it is laid down, so as to realize the interchange of the first layer plate and the second layer edge 23, thereby effectively reducing the combined potential difference between the parallel conductors in the winding coil 20, reducing the circulating current, which helps to reduce the temperature rise and improve the continuous external characteristics and peak external characteristics of the motor.

[0075] It should be noted that the number of slots between the stator slot 101 containing the first layer edge 22 and the stator slot 101 containing the second layer edge 23 of the same winding coil 20 can be set according to the actual situation. For example, the stator slots 101 of the stator core 10 can be numbered, with the first layer edge 22 of multiple coils 21 placed in slot a, and the second layer edge 23 placed in slot a+b, where b is the pitch of the winding coil 20, and the connecting part 24 is on both sides of the axial direction of the stator core 10.

[0076] In some specific embodiments, e = 0. In other words, the second layer edge 23 is staggered from the first layer edge 22 by one set of numbers when it goes offline, which can reduce the television difference to a greater extent and has a better effect on reducing circulating current.

[0077] The following describes some specific embodiments of the present invention, taking e=0 as an example.

[0078] In some embodiments, such as Figure 7 As shown, during winding, the first layer edge 22 of the p-group coil 21 is wound into slot a in the order of 1, 2, 3, ..., p groups, while the second layer edge 23 is wound into slot a+b in the order of 2, 3, ..., p, 1 groups. This method of winding the coil 20 reduces the potential difference between the winding conductors of the first layer edge 22 and the second layer edge 23, reduces the circulating current within the coil 21, and reduces copper losses.

[0079] In some embodiments, during winding, the first layer edge 22 of the p-group coil 21 is wound into slot a in the order of p, p-1, ..., 2, 1, while the second layer edge 23 is wound into slot a+b in the order of p-1, p-2, ..., 2, 1, p. This method of winding the coil 20 reduces the potential difference between the winding conductors of the first layer edge 22 and the second layer edge 23, reduces the circulating current within the coil 21, and reduces copper losses.

[0080] The following describes, with reference to the accompanying drawings, a method for unwinding multiple wound coils 20 according to some embodiments of the present invention.

[0081] In some embodiments of the present invention, the winding of the motor stator 100 may have multiple parallel branches, each parallel branch may include multiple winding coils 20 connected in series, and each winding coil 20 includes multiple sets of coils 21. Each set of coils 21 includes a first layer edge 22, a second layer edge 23, and a connecting portion 24, the connecting portion 24 being used to connect the first layer edge 22 and the second layer edge 23. In some embodiments of the winding method, such as Figures 8-9 As shown, in the parallel branch, the order of the first layer edge 22 of two adjacent winding coils 20 is opposite.

[0082] For example, such as Figure 8As shown, the first layer edge 22 of one winding coil 20 is located in slot a, and the first layer edge 22 of the other winding coil 20 is located in slot a+1. The multiple sets of coils 21 in slot a are wound sequentially in the order of groups 1, 2, 3, ..., p, and the multiple sets of coils 21 in slot a+1 are wound sequentially in the order of groups p, p-1, p-2, ..., 2, 1. This method of winding coil 20 effectively reduces the potential difference between different winding coils 20 and the winding conductors caused by leakage flux from the stator slot 101, thereby reducing circulating current, decreasing temperature rise, and improving motor performance.

[0083] It should be noted that, in two adjacent winding coils 20, the winding sequence of the second layer edge 23 of each winding coil 20 can be the same as the winding sequence of the corresponding first layer edge 22, so as to reduce the potential difference by transposing the layers of the two adjacent winding coils 20; or, in two adjacent winding coils 20, the winding sequence of the second layer edge 23 of each winding coil 20 can be staggered by several sets of numbers from the winding sequence of the corresponding first layer edge 22, so that by transposing the layers of the two adjacent winding coils 20 and transposing the layers within each winding coil 20, the effect is better to reduce the potential difference, reduce the generation of circulating current, reduce the temperature rise, and improve the motor performance.

[0084] For example, such as Figure 8 and Figure 9 As shown, in two adjacent winding coils 20, the first layer edge 22 of one winding coil 20 is wound in the order of group 1, 2, 3, ..., p, and the second layer edge 23 is wound in the order of group 2, 3, ..., p, 1; the first layer edge 22 of the other winding coil 20 is wound in the order of group p, p-1, p-2, ..., 2, 1, and the second layer edge 23 is wound in the order of group p-1, p-2, ..., 2, 1, p.

[0085] It should also be noted that, in the embodiments of the present invention, two adjacent winding coils 20 refer to the stator slots 101 where the first layer edge 22 of the two winding coils 20 is located, which differ by 1, and the stator slots 101 where the second layer edge 23 is located, which differ by 1.

[0086] by Figure 6 and Figure 9 In the illustrated embodiment, among two adjacent wound coils 20 in a parallel branch, the first layer edge 22 and the second layer edge 23 of one wound coil 20 are located on the side of the first layer edge 22 and the second layer edge 23 of the other wound coil 20 that are close to each other. In other words, the two wound coils 20 are nested together to form a concentric arrangement.

[0087] Specifically, the first layer edge 22 of the first wound coil 20 is located in slot a, and the second layer edge 23 is located in slot a+b; the first layer edge 22 of the second wound coil 20 is located in slot a+1, and the second layer edge 23 is located in slot a+b-1. It can be understood that when the number of wound coils 20 included in the parallel branch is greater than 2, the first layer edge 22 of the third wound coil 20 can be located in slot a+2, and the second layer edge 23 in slot a+b-2; the first layer edge 22 of the fourth wound coil 20 can be located in slot a+3, and the second layer edge 23 in slot a+b-3, and so on, until all the series-connected wound coils 20 in the parallel branch are completed.

[0088] Specifically, taking a parallel branch consisting of three series-connected wound coils 20 as an example, the first layer edge 22 of the first wound coil 20 can be sequentially wound into slot a in the order of groups 1, 2, 3, ..., p, and the second layer edge 23 can be sequentially wound into slot a+b in the order of groups 2, 3, ..., p, 1; the first layer edge 22 of the second wound coil 20 can be sequentially wound into slot a+1 in the order of groups p, p-1, p-2, ..., 2, 1, and the second layer edge 23 can be sequentially wound into slot a+b-1 in the order of groups p-1, p-2, ..., 2, 1, p; the first layer edge 22 of the third wound coil 20 can be sequentially wound into slot a+2 in the order of groups 1, 2, 3, ..., p, and the second layer edge 23 can be sequentially wound into slot a+b-2 in the order of groups 2, 3, ..., p, 1.

[0089] by Figure 5 and Figure 8 In the illustrated embodiment, the first layer edge 22 and the second layer edge 23 of one winding coil 20 are respectively located on the same side of the first layer edge 22 and the second layer edge 23 of the other winding coil 20. In other words, they are respectively located on the same side along the circumference of the stator core 10, such that the first layer edge 22 of one winding coil 20 is located on the clockwise side of the first layer edge 22 of the other winding coil 20, and the second layer edge 23 of one winding coil 20 is located on the clockwise side of the second layer edge 23 of the other winding coil 20. Furthermore, the two winding coils 20 form a chain-like arrangement.

[0090] Specifically, the first layer edge 22 of the first wound coil 20 is located in slot a, and the second layer edge 23 is located in slot a+b; the first layer edge 22 of the second wound coil 20 is located in slot a+1, and the second layer edge 23 is located in slot a+b+1. It can be understood that when the number of wound coils 20 included in the parallel branch is greater than 2, the first layer edge 22 of the third wound coil 20 can be located in slot a+2, and the second layer edge 23 in slot a+b+2; the first layer edge 22 of the fourth wound coil 20 can be located in slot a+3, and the second layer edge 23 in slot a+b+3, and so on, until all the series-connected wound coils 20 in the parallel branch are completed.

[0091] Specifically, taking a parallel branch consisting of three series-connected wound coils 20 as an example, the first layer edge 22 of the first wound coil 20 can be sequentially wound into slot a in the order of groups 1, 2, 3, ..., p, and the second layer edge 23 can be sequentially wound into slot a+b in the order of groups 2, 3, ..., p, 1; the first layer edge 22 of the second wound coil 20 can be sequentially wound into slot a+1 in the order of groups p, p-1, p-2, ..., 2, 1, and the second layer edge 23 can be sequentially wound into slot a+b+1 in the order of groups p-1, p-2, ..., 2, 1, p; the first layer edge 22 of the third wound coil 20 can be sequentially wound into slot a+2 in the order of groups 1, 2, 3, ..., p, and the second layer edge 23 can be sequentially wound into slot a+b+2 in the order of groups 2, 3, ..., p, 1.

[0092] The winding coils 20 produced by the above method can effectively reduce the potential difference between different winding coils 20 and the winding conductor caused by the leakage magnetic field of the stator slot 101, as well as the potential difference between the first layer edge 22 and the second layer edge 23 inside each winding coil 20, thereby reducing circulating current and reducing copper loss and temperature rise.

[0093] For multiple wound coils 20 in a parallel branch, their coils 21 are electrically connected to achieve series connection. In some embodiments where n > m ≥ 1, the last coil 21 of two adjacent wound coils 20 is electrically connected to achieve series connection between the two adjacent wound coils 20. The electrical connection lines between the two wound coils 20 are neat and orderly, avoiding winding errors or incorrect placement, and realizing transposition between different wound coils 20, reducing potential difference, circulating current, and temperature rise.

[0094] like Figure 5 and Figure 8As shown, the first winding coil 20 divides the n turns of m wires wound together into p groups, forming p-group coils 21. Its first layer edge 22 is wound into the a-th stator slot 101 in the order of groups 1, 2, ..., p, with the last group wound being the p-th coil 21. The second winding coil 20 divides the n turns of m wires wound together into p groups, forming p-group coils 21. Its first layer edge 22 is wound into the a+1-th stator slot 101 in the order of groups p, p-1, ..., 2, 1, with the last group wound being the 1-th coil 21. The p-th coil 21 of the first winding coil 20 is electrically connected to the 1-th coil 21 of the second winding coil 20, so that the first and second winding coils 20 are connected in series.

[0095] In some embodiments where 1 < n < m, coils 21 with the same number among the p coils 21 of two adjacent wound coils 20 are electrically connected to achieve series connection of the two adjacent wound coils 20. The electrical connection lines between the two wound coils 20 are neat and orderly, avoiding winding errors or incorrect wiring, and realizing transposition between different wound coils 20, reducing potential difference, circulating current and temperature rise.

[0096] like Figure 5 and Figure 8 As shown, the first winding coil 20 divides the m wires wound with n turns into p groups to form a p group coil 21, and its first layer edge 22 is wound into the a-th stator slot 101 in the order of 1, 2, ..., p groups; the second winding coil 20 divides the m wires wound with n turns into p groups to form a p group coil 21, and its first layer edge 22 is wound into the a+1-th stator slot 101 in the order of p, p-1, ..., 2, 1 groups. In this configuration, the first group of coils 21 of the first wound coil 20 is electrically connected to the first group of coils 21 of the second wound coil 20, the second group of coils 21 of the first wound coil 20 is electrically connected to the second group of coils 21 of the second wound coil 20, and so on. The p-th group of coils 21 of the first wound coil 20 is electrically connected to the p-th group of coils 21 of the second wound coil 20, so that the first wound coil 20 and the second wound coil 20 are connected in series. This reduces AC resistance, decreases the circulating current generated by the potential difference between the multiple strands of wire, and reduces temperature rise.

[0097] In some embodiments of the present invention, such as Figure 2 As shown, before the p-group coils 21 are lowered into the stator slot 101, each group of coils 21 is wrapped with an insulating component 30. The insulating component 30 can be insulating paper or insulating film, etc. After each group of coils 21 is wrapped with the insulating component 30, it is lowered into the stator slot 101, which separates each group of coils 21. This allows the conductors to be distributed more regularly and orderly in the stator slot 101, increases the inter-turn insulation performance, and improves the inter-turn withstand voltage and PDIV (partial discharge over-voltage) performance.

[0098] The winding device for a motor stator 100 according to an embodiment of the present invention is used to perform the winding method for a motor stator 100 according to an embodiment of the present invention. Since the winding method for a motor stator 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the winding device for a motor stator 100 according to an embodiment of the present invention, by grouping each winding coil 20 and fixing each group after winding to form multiple groups of coils 21, reduces the number of parallel windings or turns of the wires in each winding of the coil 21, making the tension of the parallel windings consistent, simplifying the winding process, and resulting in a more uniform and neat distribution of wires within the stator slot 101. This reduces length deviations between multiple wires, reduces resistance deviations, makes the potentials on the conductors closer, reduces circulating current generation, thereby helping to reduce temperature rise and improve motor performance.

[0099] The motor stator 100 according to an embodiment of the present invention is wound using a winding method according to an embodiment of the present invention. Since the winding method of the motor stator 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the motor stator 100 according to an embodiment of the present invention, by winding each winding coil 20 in groups according to the number of parallel winding strands and the number of parallel winding turns, and fixing each group after winding to form multiple groups of coils 21, reduces the number of parallel winding strands or the number of parallel winding turns of the coil 21 each time, making the tension of the parallel winding multiple strands consistent, simplifying the winding process, and resulting in a more uniform and neat distribution of wires within the stator slot 101. This reduces length deviations between multiple wires, reduces resistance deviations, makes the potentials on the conductors closer, reduces circulating current generation, thereby helping to reduce temperature rise and improve motor performance.

[0100] The drive motor 2000 according to an embodiment of the present invention includes a motor stator 100 according to an embodiment of the present invention. Since the motor stator 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the drive motor 2000 according to an embodiment of the present invention, by winding each winding coil 20 in groups according to the number of parallel winding strands and the number of parallel winding turns, and fixing each group after winding to form multiple groups of coils 21, reduces the number of parallel winding strands or the number of parallel winding turns of the wires in each winding of the coil 21, making the tension of the parallel winding multiple strands consistent, simplifying the winding process, and making the wire distribution in the stator slot 101 more neat and uniform. This reduces the length deviation between multiple wires, reduces resistance deviation, makes the potential on the conductors closer, reduces the generation of circulating current, thereby helping to reduce temperature rise and improve motor performance.

[0101] like Figure 10As shown, the vehicle 3000 according to an embodiment of the present invention includes a drive motor 2000 according to an embodiment of the present invention. Since the drive motor 2000 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the vehicle 3000 according to an embodiment of the present invention, by winding each winding coil 20 in groups according to the number of parallel winding strands and the number of parallel winding turns, and fixing each group after winding to form multiple groups of coils 21, reduces the number of parallel winding strands or the number of parallel winding turns of the coil 21 each time, making the tension of the parallel winding multiple strands consistent, simplifying the winding process, and making the distribution of wires in the stator slot 101 more neat and uniform. This reduces the length deviation between multiple wires, reduces resistance deviation, makes the potential on the conductors closer, reduces the generation of circulating current, thereby helping to reduce temperature rise and improve motor performance.

[0102] It is worth noting that vehicle 3000 can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc. Furthermore, the motor provided by any of the above designs can serve as the vehicle's drive motor 2000. Specifically, drive motor 2000 can independently start the functional devices of vehicle 3000. Alternatively, drive motor 2000 can cooperate with other drive devices on vehicle 3000 to ensure the normal operation of the functional devices on vehicle 3000. The functional devices of vehicle 3000 can be any or any combination of the following: wheels, air conditioner, lighting components, etc.

[0103] Other configurations and operations of the vehicle 3000, drive motor 2000 and motor stator 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0104] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0105] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0106] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for winding a motor stator, characterized in that, The winding coil of the motor stator is formed by m wires wound with n turns, and the winding method includes: Based on the number of wires m and the number of turns n of each wire in the winding coil, each winding coil is grouped and wound and fixed to obtain p groups of coils. When n > m ≥ 1, the number of turns n of each wire in the winding coil is grouped, and when 1 < n < m, the number of wires m in the winding coil is grouped. Connect the coils of group p to the stator slots of the motor stator; when n > m ≥ 1. n = Ap + B, where one group of coils includes m wires wound with A + B turns, and the remaining groups of coils each include m wires wound with A turns. A and B are both integers, A > 0, 0 ≤ B < p; n / 4 ≤ p ≤ n; the winding of the motor stator has multiple parallel branches, each parallel branch includes multiple winding coils connected in series, each group of coils includes a first layer edge, a second layer edge, and a connecting part connecting the first layer edge and the second layer edge, in the parallel branch, the order of the first layer edge of two adjacent winding coils is opposite.

2. The method for winding the motor stator according to claim 1, characterized in that, When 1 < n < m m = Cp + D, where one group of coils includes C + D wires wound with n turns, and the remaining groups of coils each include C wires wound with n turns, where C and D are both integers, C > 0, 0 ≤ D < p.

3. The method for winding the motor stator according to claim 2, characterized in that, m / 5≤p<m.

4. The method for winding the motor stator according to claim 1, characterized in that, Each group of coils includes a first layer edge, a second layer edge, and a connecting portion connecting the first layer edge and the second layer edge. The step of unwinding the p groups of coils into the stator slots of the motor stator includes: The coils in group p are numbered according to the winding sequence; The first layer edge of the coil in group p is wired into one of the stator slots in the order of 1, 2, ..., p groups, and the second layer edge is wired into another stator slot in the order of e+2, e+3, ..., p, 1, ..., e+1 groups; or, the first layer edge is wired into one of the stator slots in the order of p, p-1, ..., 1 groups, and the second layer edge is wired into another stator slot in the order of p-1-e, p-2-e, ..., 1, p, ..., pe groups, where 0 ≤ e < p-1.

5. The method for winding the motor stator according to claim 4, characterized in that, e=0。 6. The method for winding the stator of a motor according to claim 1, characterized in that, In the two adjacent winding coils of the parallel branch, The first and second layer edges of one of the wound coils are located on the sides of the first and second layer edges of the other wound coil that are close to each other; or, The first layer edge and the second layer edge of one of the winding coils are respectively located on the same side of the first layer edge and the second layer edge of the other winding coil.

7. The method for winding the stator of an electric motor according to any one of claims 1-5, characterized in that, Before the p groups of coils are laid into the stator slots, each group of coils is wrapped with an insulating material.

8. A winding device for a motor stator, characterized in that, The winding device is used to perform the winding method for the motor stator according to any one of claims 1-7.

9. A motor stator, characterized in that, The motor stator is wound using the winding method for the motor stator according to any one of claims 1-7.

10. A drive motor, characterized in that, Includes the motor stator according to claim 9.

11. A vehicle, characterized in that, Includes the drive motor according to claim 10.

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