Composite wire, motor winding structure and motor stator

Abstract

The utility model relates to the technical field of composite wires, in particular to a composite wire, a motor winding structure and a motor stator, and the composite wire comprises a wire body, an insulating medium layer and an external insulating layer. The wire body at least comprises two bare wires, and the bare wires are arranged in parallel and are arranged in a fitting manner; the insulating medium layer is arranged between the binding surfaces of the adjacent bare conductors and is used for blocking the transverse flow of current between the adjacent bare conductors; the external insulating layer wraps the outer surface of the wire body. According to the composite wire provided by the utility model, the complexity of conductor painting, forming and welding processes during motor winding manufacturing can be reduced, and the production efficiency and the structural reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of composite conductor technology, specifically to a composite conductor, a motor winding structure, and a motor stator. Background Technology

[0002] High efficiency of drive motors is one of the key technical requirements for electric vehicles. Compared with traditional round wire motors, flat wire motors have a higher stator slot fill factor, lower winding DC resistance, and higher motor efficiency, which has led to their widespread use in electric vehicles.

[0003] During motor operation, the windings, as the core component, generate heat due to eddy current losses caused by alternating current inside the conductors, which in turn reduces motor efficiency. Utility Model Content

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0005] To address the problems mentioned above, the current approach is to divide a single enameled wire into multiple independent conductors, thereby reducing the cross-sectional area of ​​each conductor to suppress eddy current intensity.

[0006] However, this method has significant drawbacks in implementation: First, multiple independent conductors require separate processes such as painting, straightening, paint removal, bending, and welding, leading to complex production processes and extended cycles; second, the difficulty of coordinating the processing of each conductor increases, especially during winding and welding, which can easily introduce process errors, affecting product consistency and reliability. Therefore, it is necessary to simplify the conductor structure to solve the above technical problems.

[0007] In view of the shortcomings of the above technologies, the purpose of this utility model is to provide a composite conductor, a motor winding structure and a motor stator. The composite conductor can simplify the complexity of conductor painting, forming and welding processes, and improve production efficiency and structural reliability.

[0008] To achieve the above and other related objectives, this utility model provides a composite conductor, comprising:

[0009] The conductor body includes at least two bare conductors, which are arranged in parallel and side by side and fitted together.

[0010] An insulating dielectric layer is disposed between the mating surfaces of adjacent bare conductors to block the lateral flow of current between adjacent bare conductors;

[0011] An external insulation layer covers the outer surface of the conductor body.

[0012] In one embodiment of this utility model, the insulating dielectric layer is an organic insulating layer, an inorganic insulating layer, a composite insulating layer, or a metal oxide layer with voltage resistance.

[0013] In one embodiment of the present invention, the metal oxide layer is an oxide layer generated in situ on the surface of at least one of the bare conductors.

[0014] In one embodiment of this utility model, the bare conductor is made of copper, and the metal oxide layer is copper oxide on the surface of the bare conductor; or the bare conductor is made of aluminum, and the metal oxide layer is aluminum oxide on the surface of the bare conductor.

[0015] In one embodiment of the present invention, the bare conductor is made of conductive metal or conductive alloy, and the surfaces of adjacent bare conductors that are at least close to each other are provided with an insulating coating or insulating cover layer.

[0016] In one embodiment of this utility model, the cross-sectional shape of the bare conductor is flat, polygonal, rectangular, or trapezoidal.

[0017] In one embodiment of this utility model, the bare wires are fixed together by an adhesive, which is a high-temperature resistant insulating adhesive or a thermosetting resin with insulating properties.

[0018] To achieve the above and other related objectives, this utility model provides a motor winding structure, including the composite conductor, wherein the composite conductor is bent or three-dimensionally formed to form a winding unit.

[0019] To achieve the above and other related objectives, this utility model provides a motor stator, comprising:

[0020] A stator core has multiple stator slots arranged circumferentially, and the stator slots include slot openings near the center of the stator core;

[0021] The winding includes multiple conductors arranged radially along the stator core in the stator slot, wherein at least the first conductor and the second conductor have a smaller cross-sectional area than the other conductors, and wherein the first conductor and the second conductor are two conductors continuously arranged in the slot in a direction away from the center of the stator core.

[0022] Wherein, at least the first conductor and the second conductor are combined into a composite conductor, the composite conductor comprising:

[0023] The conductor body includes at least two bare conductors, each of which is arranged in parallel and side by side;

[0024] An insulating dielectric layer is disposed between adjacent bare conductors to block the lateral flow of current between adjacent bare conductors;

[0025] An external insulation layer covers the outer surface of the conductor body.

[0026] In one embodiment of this utility model, the width of each conductor in each stator slot gradually increases from the slot opening towards the direction away from the center of the stator core along the radial direction of the stator core;

[0027] The width of each stator slot adapts to the change in the width of the conductor.

[0028] In one embodiment of the present invention, in each of the stator slots, at least the sum of the cross-sectional areas of the first conductor and the second conductor is less than or equal to the cross-sectional area of ​​the other individual conductors.

[0029] In one embodiment of this utility model, in each of the stator slots, at least the cross-sectional areas of the first conductor and the second conductor are equal.

[0030] In summary, the composite conductor of this invention reduces the effective cross-sectional area of ​​a single conductor by dividing the overall conductor body into multiple parallel bare conductors. When applied to the windings of a motor stator, this reduces eddy current intensity (eddy current loss is proportional to the square of the conductor size). Secondly, the insulating dielectric layer blocks the transverse current between the bare conductors, avoiding additional losses caused by localized current concentration. Finally, the external insulation layer integrates multiple bare conductors into a single structure, eliminating the need for separate external insulation layers and processing steps for each bare conductor in traditional solutions, thus simplifying the production process. Therefore, when applied to the motor stator, the composite conductor of this invention not only suppresses eddy currents but also integrates previously dispersed processing steps into a single integrated process, significantly improving efficiency and consistency. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a composite conductor structure according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the composite conductor structure according to another embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of a partial structure of a motor stator according to an embodiment of the present invention;

[0035] Figure 4This is a schematic diagram of a partial structure of a motor stator in the prior art.

[0036] Figure 5 To Figure 4 A schematic diagram of a partial structure of the improved motor stator.

[0037] Figure 6 This is a comparison diagram of motor losses before and after the stator improvement in this case;

[0038] Figure 7 This is a schematic diagram of the improved stator slot structure according to an embodiment of the present invention;

[0039] Figure 8 This is a cross-sectional view of the complete structure of the motor stator in one embodiment of the present invention;

[0040] Figure 9 This is a simplified diagram of the wire connections for each phase winding in one embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the wire connection for one phase in one embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the motor stator structure in one embodiment of this case;

[0043] Component labeling description: Composite conductor 10, conductor body 11, bare conductor 111, insulating dielectric layer 12, external insulating layer 13, stator slot S, slot opening S0, conductor Sx-y, first conductor Sx-1, second conductor Sx-2, conductor S1-1 of the first layer of the first stator slot, conductor S1-2 of the second layer of the first stator slot, conductor S1-3 of the third layer of the first stator slot, conductor S1-4 of the fourth layer of the first stator slot, conductor S1-5 of the fifth layer of the first stator slot, conductor S1-6 of the sixth layer of the first stator slot. Detailed Implementation

[0044] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0045] Please see Figures 1 to 11 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0046] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0047] Please see Figure 1 Alternatively, this invention provides a solution where, in traditional multi-conductor solutions for motor windings, the cross-sectional area is reduced by dividing individual conductors to suppress eddy current losses. However, each conductor needs to be processed independently, leading to complex processes such as painting, bending, and welding, resulting in low production efficiency and the introduction of errors. The composite conductor 10 of this invention, through structural innovation, integrates multiple conductors into a single structure while reducing eddy current losses, simplifying the production process and improving reliability.

[0048] This utility model provides a composite conductor 10, including a conductor body 11, an insulating dielectric layer 12, and an outer insulating layer 13; the conductor body 11 includes at least two bare conductors 111, which are arranged in parallel and attached together; the insulating dielectric layer 12 is disposed between the contact surfaces of adjacent bare conductors 111 to block the lateral flow of current between adjacent bare conductors 111; the outer insulating layer 13 covers the outer surface of the conductor body 11.

[0049] It should be noted that the bare conductor 111 is generally made of metal. A bare conductor refers to a conductor consisting only of a metal conductor (such as copper, aluminum, or aluminum steel core) and without any insulation layer on its surface. The cross-sectional shape of the bare conductor 111 is flat, polygonal, rectangular, trapezoidal, or semi-circular. There are two, three, four, or more bare conductors 111. Two or more bare conductors 111 are arranged in parallel to form a common rail structure. The multiple bare conductors 111 within the common rail structure can be connected, for example, bonded together with insulating glue, or they can be unconnected, for example, adjacent bare conductors 111 are isolated by an insulating dielectric layer 12, but each bare conductor 111 is arranged in parallel within a total external insulation layer 13. The insulating dielectric layer 12 serves as an isolation layer between bare conductors 111. It uses a high-resistance material to block the transverse current generated between the bare conductors 111 due to the potential difference, thereby suppressing eddy current losses. The insulating dielectric layer 12 can be an organic insulating layer (such as epoxy resin), an inorganic insulating layer (such as a ceramic coating), or a metal oxide layer (such as copper oxide), and can be formed by methods such as in-situ oxidation of the bare conductor 111 surface, external coating, or insertion of a pre-placed thin film. The insulating dielectric layer 12 can also be a copper oxide layer, an epoxy resin adhesive layer, a ceramic sol coating, or an insulating adhesive layer. It should be understood that the insulating dielectric layer 12 in this invention only needs to be disposed between adjacent bare conductors 111 to block the adjacent bare conductors 111. The current can flow laterally between the conductors. Generally, it is not necessary to cover the entire surface of the bare conductor 111. Of course, the bare conductor 111 can also meet the actual use requirements by in-situ oxidation of the surface and external insulating varnish coating. The external insulation layer 13 is the outermost protective structure of the conductor body 11, providing mechanical support and environmental isolation. The material of the external insulation layer 13 is, for example, a thermoplastic polymer (such as PEEK), a thermosetting resin (such as polyimide), or a flexible insulating film (such as polyester film), which can be formed by wrapping, extrusion molding, or spray curing. Specific external insulation layers 13 include insulating film wrapping layers and polyimide spray coating layers. The external insulation layer 13 covers the outer surface of the conductor body 11. It should be understood that the external insulation layer 13 generally does not need to cover the ends of the conductor body 11.

[0050] The composite conductor 10 of this invention reduces the effective cross-sectional area of ​​a single conductor body 11 by dividing the conductor body 11 into multiple parallel bare conductors 111. This reduces eddy current intensity (eddy current loss is proportional to the square of the conductor size) when applied to the windings of a motor stator. Simultaneously, the insulating dielectric layer 12 blocks the transverse current between conductors, avoiding additional energy loss caused by localized current concentration, thus significantly reducing heat generation and energy loss. The external insulating layer 13 integrates multiple conductors into a single structure, eliminating the need for independent painting, straightening, and bending of each conductor in traditional solutions. This simplifies the production process, shortens the production cycle, and improves processing efficiency and product consistency. The integrated design effectively prevents displacement or contact between the bare conductors 111, enhancing mechanical stability and insulation durability, ensuring long-term operational reliability. Therefore, when applied to the windings of a motor stator, the composite conductor 10 of this invention can suppress eddy currents while integrating previously dispersed process steps into a single process, improving manufacturing efficiency and consistency. Furthermore, this structure is adaptable to different conductor arrangements and insulation material selections, and can flexibly meet the demanding requirements of high frequency, high temperature and other harsh operating conditions. It provides a solution with both performance and cost advantages for the lightweight and high efficiency of motors, and solves the contradiction between the process complexity and high cost caused by the independent processing of traditional multi-conductor windings and the contradiction between eddy current loss and insulation reliability.

[0051] Please see Figure 1 Alternatively, as an optional embodiment of this case, the insulating dielectric layer 12 is an organic insulating layer, an inorganic insulating layer, a composite insulating layer, or a metal oxide layer with voltage resistance.

[0052] It should be noted that organic insulating layers include epoxy resin, polyimide (high temperature resistance), and silicone rubber (flexible adaptability); inorganic insulating layers include alumina ceramic coatings and silicon nitride films (high thermal conductivity); composite insulating layers include epoxy-ceramic composites and polyimide-graphene coatings (enhanced thermal conductivity); and metal oxide layers include copper oxide, alumina, zinc oxide, and silver oxide. The insulating dielectric layer 12 blocks the transverse current generated between conductors due to potential differences, avoiding additional losses caused by localized current concentration. The in-situ formation of the metal oxide layer not only provides insulation but also bonds tightly to the conductor body, avoiding the risk of insulation peeling and enhancing structural stability.

[0053] Please see Figure 1 Alternatively, as an optional embodiment of this case, the metal oxide layer is an oxide layer generated in situ on the surface of at least one of the bare conductors 111.

[0054] It should be noted that the in-situ generated oxide layer refers to the insulating layer formed on the surface of the bare conductor 111 through the direct reaction between the material (such as copper or aluminum) and the oxidizing medium (such as oxygen). The oxide layer is tightly bonded to the bare conductor 111 without the need for additional external processes; for example, copper conductors generate copper oxide layers, aluminum conductors generate aluminum oxide layers, and silver conductors generate silver oxide layers. The in-situ oxidation of the bare conductor 111 surface to form an insulating layer eliminates the need for traditional painting processes, simplifying the production steps. The chemical bonding between the oxide layer and the bare conductor 111 enhances adhesion, avoids the risk of peeling, and the integrated bonding between the oxide layer and the bare conductor 111 provides high temperature resistance, anti-aging properties, and stable insulation performance, blocking the transverse current between the bare conductors 111 and suppressing eddy current losses in the windings of the motor stator.

[0055] Please see Figure 1 Alternatively, as an optional embodiment of this case, the bare conductor 111 is made of copper, and the metal oxide layer is copper oxide on the surface of the bare conductor 111; or the bare conductor 111 is made of aluminum, and the metal oxide layer is aluminum oxide on the surface of the bare conductor 111; or the bare conductor 111 is made of silver, and the metal oxide layer is silver oxide on the surface of the bare conductor 111.

[0056] The bare conductor 111 is made of copper or aluminum because of its excellent conductivity and ease of processing; the metal oxide layer is generated in situ through surface oxidation reaction, which has both insulation and structural integration characteristics, and the oxide layer can be achieved by high-temperature oxidation, electrochemical oxidation, and plasma oxidation.

[0057] Please see Figure 1 Alternatively, as an optional embodiment of this case, the bare conductor 111 is made of conductive metal or conductive alloy, and the surfaces of the bare conductors 111 that are at least close to each other are provided with an insulating coating or insulating cover.

[0058] It should be noted that the insulating coating is, for example, an insulating varnish or insulating adhesive, and the insulating cover layer is, for example, an in-situ generated oxide layer with voltage resistance on the surface of the bare conductor 111; the conductive metal or alloy provides high conductivity, while the insulating coating or cover layer on the surface of adjacent conductors directly blocks the lateral flow of current, further suppressing eddy current losses in the motor. Eddy currents are suppressed through local insulation optimization, while avoiding the complexity of traditional multi-conductor independent processing. It should be understood that in this case, the structure of the bare conductor 111 itself can be improved so that at least the adjacent surfaces have an insulating coating or insulating cover layer, and an additional insulating dielectric layer 12 is added to achieve double insulation protection; alternatively, the insulating coating or insulating cover layer on the surface of the adjacent bare conductor 111 can be the insulating dielectric layer 12 described in this case, providing single-layer insulation protection.

[0059] Please see Figure 1Alternatively, as an optional embodiment of this case, the cross-sectional shape of the bare conductor 111 is flat, polygonal, rectangular, or trapezoidal.

[0060] It should be noted that the cross-sectional shape of the conductor directly affects the eddy current distribution and space utilization. Flat and polygonal designs can optimize the current path, rectangular and trapezoidal cross-sections facilitate manufacturing and integration, and semi-circular cross-sections can reduce the skin effect. Optimization of the conductor cross-sectional shape (such as flat design) further reduces the skin effect and makes the current distribution more uniform.

[0061] Please see Figure 1 Alternatively, as an optional embodiment of this case, the bare conductors 111 are fixed together by an adhesive, which is a high-temperature resistant insulating adhesive or a thermosetting resin with insulating properties.

[0062] It should be noted that the adhesive physically bonds multiple bare conductors 111 into a common rail structure, replacing traditional mechanical clipping or welding processes. Its insulation prevents direct contact between the bare conductors 111, avoiding short circuits, while simplifying the assembly process. Its high-temperature resistance ensures the stability of the winding under high-temperature conditions. The adhesive can be, for example, epoxy resin, silicone rubber, or polyimide glue, and is cured by thermosetting (180℃-250℃), UV curing, or room temperature curing. In this case, the adhesive prevents conductor displacement, improves mechanical strength, and its own insulating properties supplement the insulation layer. The bonding process is compatible with automated production, shortening the manufacturing cycle.

[0063] Please see Figure 1 Alternatively, as an optional embodiment of this case, the outer insulation layer 13 is formed into a continuous covering structure by winding, extrusion or spraying processes. It should be understood that the outer insulation layer 13 may not cover the ends of the composite wire 10.

[0064] As an optional embodiment of this case, the number of bare wires 111 is multiple, and the multiple bare wires 111 are arranged in a stacked manner. For example, the bare wires 111 are flat wires and are arranged in layers to improve the effect of suppressing motor eddy current losses.

[0065] Please see Figure 1 Alternatively, as an optional embodiment of this case, the outer surface of the outer insulation layer 13 is provided with at least one functional coating selected from a moisture-proof layer and a wear-resistant layer.

[0066] Please see Figure 3 This utility model provides a motor winding structure, including the composite wire 10, which is formed into a winding unit by bending or three-dimensional molding.

[0067] It should be noted that the winding unit can be formed by CNC bending, hot pressing, or other methods. The integrated structure of the composite conductor 10 maintains the integrity of the conductor and the insulation during bending or three-dimensional forming. The outer insulation layer 13 provides mechanical protection to prevent damage to the insulating dielectric layer 12 during processing; the fixing and insulation design between conductors ensures the electrical stability of the winding unit after forming and reduces local eddy current losses caused by conductor displacement or contact.

[0068] The first embodiment of this case:

[0069] In this case, the skin effect at slot S0 of the motor stator refers to the uneven current distribution within the conductor Sx-y under high-frequency alternating current, resulting in a higher current density closer to the surface of conductor Sx-y. The mechanism of the skin effect is mainly related to eddy currents in the electromagnetic field. When alternating current flows through conductor Sx-y, a changing magnetic field is generated around conductor Sx-y. This changing magnetic field induces current, i.e., eddy currents, in conductor Sx-y. The electromagnetic field generated by these eddy currents in conductor Sx-y interacts with the electromagnetic field of the original current, causing a decrease in the magnetic flux at the center of conductor Sx-y, thus concentrating the current in the surface area of ​​conductor Sx-y. Simultaneously, when the motor operates at high speed, due to the skin effect and proximity effect, conductor Sx-y generates additional AC resistance. The magnitude of the AC resistance is closely related to the skin depth and the cross-sectional area of ​​conductor Sx-y. The factors affecting skin depth are detailed in equation (1). The higher the motor speed, the smaller the skin depth and the more obvious the skin effect. The larger the radial cross-sectional area of ​​the conductor Sx-y, the more severe the skin effect and proximity effect, and the greater the AC loss of the conductor Sx-y. The formula for skin depth is as follows:

[0070]

[0071] δ is the skin depth; ρ is the resistivity of the conductor; μ0 is the permeability of free space; μ c denoted as ρ, where ρ is the relative permeability of the conductor; f is the frequency.

[0072] like Figure 3 As shown, this utility model provides a motor stator, including a stator core and windings; the stator core is provided with a plurality of stator slots S in the circumferential direction, and the stator slots S include slot openings S0 near the center of the stator core; the windings include a plurality of conductors Sx-y arranged radially in the stator slots S along the stator core, wherein at least the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2 is smaller than the cross-sectional area of ​​the other conductors Sx-y, wherein the first conductor Sx-1 and the second conductor Sx-2 are two conductors Sx-y continuously arranged in the slot openings S0 in a direction away from the center of the stator core.

[0073] In this case, in the conductor Sx-y, x and y are positive integers, and x≥1, y≥1. S represents any stator slot, and one of the stator slots S is defined as the first stator slot S1. Sx represents the x-th stator slot in the circumferential direction of the stator core, and Sx-y represents the conductor of the y-th layer in the x-th stator slot.

[0074] Wherein, at least the first conductor Sx-1 and the second conductor Sx-2 are combined to form a composite conductor 10, the composite conductor 10 including a conductor body 11, an insulating dielectric layer 12 and an outer insulating layer 13;

[0075] The conductor body 11 includes at least two bare conductors 111, which are arranged in parallel and attached together; the insulating dielectric layer 12 is disposed between the contact surfaces of adjacent bare conductors 111 to block the lateral flow of current between adjacent bare conductors 111; the outer insulating layer 13 covers the entire exterior of the conductor body 11.

[0076] It should be noted that the above winding includes the first conductor Sx-1 and the second conductor Sx-2, and may also include the third conductor Sx-3, the fourth conductor Sx-4 and more conductors Sx-y. The conductor body 11 in the composite conductor 10 corresponds to this, including two bare conductors 111, three bare conductors 111, four bare conductors 111 or more bare conductors 111, and corresponds one-to-one with the first conductor Sx-1, the second conductor Sx-2, the third conductor Sx-3, the fourth conductor Sx-4 and more conductors Sx-y.

[0077] It should be understood that after the first conductor Sx-1 and the second conductor Sx-2 are combined to form the composite conductor 10, the cross-sectional area of ​​the bare conductor 111 in the composite conductor 10 is smaller than the cross-sectional area of ​​the other conductors Sx-y. By optimizing the winding layout through the composite conductor 10, radially arranged conductors are embedded in the circumferential stator slots of the stator core. At least the first conductor Sx-1 and the second conductor Sx-2 are combined to form the composite conductor 10 structure. The composite conductor 10 includes a conductor body 11, an insulating dielectric layer 12, and an outer insulating layer 13. The conductor body 11 includes at least two parallel bare conductors 111.

[0078] The stator core is ring-shaped, and multiple stator slots S are evenly arranged circumferentially on the ring-shaped stator core. This case mainly uses a three-phase motor as an example for discussion, and the conductors Sx-y described in this case are mainly flat wire conductors. It should be understood that this case is also applicable to motors of other phases according to actual needs. In this case, each flat wire conductor Sx-y is arranged radially along the stator core in its corresponding stator slot S, and the cross-sectional area of ​​the conductor Sx-y is in the direction of the stator slot S toward the center of the stator core, that is, the radial direction of the stator core. It should be understood that among the conductors Sx-y, at least the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2 is smaller than the cross-sectional area of ​​the other conductors Sx-y, wherein the first conductor Sx-1 and the second conductor Sx-2 are in the direction of the slot S0 away from the center of the stator core. Two conductors Sx-y are continuously arranged in the direction of the first conductor. Depending on actual needs, a third conductor Sx-3, a fourth conductor Sx-4, and more conductors Sx-y may also exist. The cross-sectional area of ​​the third conductor Sx-3, the fourth conductor Sx-4, and the more conductors Sx-y is smaller than the cross-sectional area of ​​the other conductors Sx-y. These other conductors Sx-y do not include the first conductor Sx-1, the second conductor Sx-2, the third conductor Sx-3, the fourth conductor Sx-4, and the more conductors Sx-y. Furthermore, since at least the first conductor... The cross-sectional area of ​​wire Sx-1 and the second wire Sx-2 is smaller than the cross-sectional area of ​​other wires Sx-y. This means that the total number of first wire Sx-1, second wire Sx-2 and more wires Sx-y in each stator slot S is less than the total number of wires Sx-y in each stator slot S. That is, there must be at least one wire Sx-y whose cross-sectional area is greater than the cross-sectional area of ​​first wire Sx-1, second wire Sx-2 and more wires Sx-y that are the same as first wire Sx-1 and second wire Sx-2. The first conductor Sx-1, the second conductor Sx-2, the third conductor Sx-3, the fourth conductor Sx-4, and the subsequent conductors Sx-y are continuously arranged from the slot S0 in a direction away from the center of the stator core. Specifically, the first conductor Sx-1 and the second conductor Sx-2 can be two conductors Sx-y arranged sequentially from the slot S0 away from the center of the stator core, meaning the first conductor Sx-1 is the one closest to the slot S0. However, depending on actual needs, the first conductor Sx-1 and the second conductor Sx-2 can also be two conductors Sx-y arranged sequentially from the center of the stator core towards the slot S0, meaning the first conductor Sx-1 can also be the one furthest from the slot S0.

[0079] It should be further explained that when the conductor Sx-y of the motor stator is a flat conductor, and at high speeds of the flat-wire motor, the skin effect and proximity effect in the conductor Sx-y of the flat-wire motor will cause serious AC losses, thereby reducing the motor's operating efficiency. However, research has found that the skin effect and proximity effect are more severe in the conductor Sx-y closer to the slot opening S0. Therefore, in this case, the cross-sectional area of ​​the conductor Sx-y near the slot opening S0 is reduced, such as by reducing the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2, thereby suppressing the AC losses of the motor in the high-speed region and improving the motor's operating efficiency. It should be understood that the cross-sectional area of ​​the third conductor Sx-3 and the fourth conductor Sx-4 near the slot S0 in conductor Sx-y can also be reduced. However, it should be noted that it is not always better to have more conductors Sx-y with reduced cross-sectional area. This is because too many conductors Sx-y with reduced cross-sectional area will increase the DC resistance of the flat wire motor and reduce the motor efficiency. Furthermore, the reduction in the cross-sectional area of ​​conductor Sx-y leads to an increase in the number of conductor Sx-y layers, which will also increase the complexity of the manufacturing process. Therefore, in this case, it is preferable to reduce the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2 near the slot S0. However, it should be understood that for motors of different power, the number of conductors Sx-y with reduced cross-sectional area can be selected as an optimal number based on the actual AC loss and the magnitude of the DC resistance.

[0080] like Figure 6 The diagram shown is a comparison of AC losses before and after the stator improvement in this case. M represents the existing design before the improvement, and its partial stator structure is shown below. Figure 4 As shown; N represents the improved solution in this case, and its motor stator partial structure is as follows. Figure 3 As shown, the comparison results of motor losses show that at the peak operating point of 4000rpm, the motor using the proposed solution has a 2.2% reduction in losses compared to the motor before the improvement, and at the peak operating point of 16000rpm, the motor using the proposed solution has a 18.2% reduction in losses compared to the motor before the improvement.

[0081] Second embodiment of this case:

[0082] like Figure 7-8 As shown, as an optional embodiment of this case, the width of each conductor Sx-y in each stator slot S gradually widens from the slot opening S0 toward the direction away from the center of the stator core along the radial direction of the stator core.

[0083] It should be noted that, on the one hand, the gradual widening of the conductor Sx-y helps it dissipate heat better because the wider portion of Sx-y provides a larger surface area, thus improving the motor's heat dissipation performance. On the other hand, in some flat-wire motors, insulating paper is required between the stator slot S and the conductor Sx-y to ensure insulation between dissimilar conductors and between the conductor and the stator core. By optimizing the shape of the conductor Sx-y, the amount of insulating material used can be reduced while maintaining insulation performance, thereby lowering costs. Figure 10 As shown, since the conductor Sx-y in this case is a flat conductor, each layer of conductor Sx-y in each stator slot S is actually a conductor segment. This conductor segment is electrically connected to other corresponding conductors at the end of the motor stator, thereby enabling the conductor Sx-y in each stator slot S to have different dimensions.

[0084] like Figure 7-8 As shown, in an optional embodiment of this case, the width of each stator slot S adapts to the change in the width of the conductor Sx-y.

[0085] It should be noted that, since the width of each conductor Sx-y in each stator slot S gradually widens from the slot opening S0 towards the center of the stator core along the radial direction of the stator core, by adapting the width of each stator slot S to the change of the conductor Sx-y width, the area of ​​the stator slot S can be increased without increasing the size of the stator core, thereby allowing more conductors Sx-y to be placed, improving the fill rate of conductors Sx-y, and thus improving the power density and efficiency of the motor.

[0086] like Figure 7-8 As shown, in an optional embodiment of this case, in each stator slot S, the sum of the cross-sectional areas of at least the first conductor Sx-1 and the second conductor Sx-2 is less than or equal to the cross-sectional area of ​​the other single conductor Sx-y. Therefore, when there are only the first conductor Sx-1, the second conductor Sx-2, and the other conductor Sx-y, the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2 is at most half the cross-sectional area of ​​the other single conductor Sx-y. That is, the first conductor Sx-1 and the second conductor Sx-2 are two conductors Sx-y with smaller cross-sectional areas formed by optimizing and improving the original other conductor Sx-y, thereby effectively reducing the AC loss of the motor, especially the conductor AC loss in the high-speed region, and improving the motor efficiency and continuous performance. The number of conductors Sx-y in each stator slot S is only reduced to N+1 from the original N conductors Sx-y. Compared with the existing scheme, the production process is simpler. Since the cross-sectional area of ​​the conductor near the slot opening S0 is reduced to half of the original, and the heat generation is reduced, the continuous performance output capability of the motor in the high-speed region is improved.

[0087] like Figure 7-8 As shown, in an optional embodiment of this case, in each of the stator slots S, at least the cross-sectional areas of the first conductor Sx-1 and the second conductor Sx-2 are equal.

[0088] It should be noted that at least the first conductor Sx-1, the second conductor Sx-2, the third conductor Sx-y, the fourth conductor Sx-y, or more conductors Sx-y may have equal cross-sectional areas. It should be understood that, to simplify the number of windings, it is preferable that the conductor Sx-y closest to the slot opening S0 of the stator slot S has the same cross-sectional area as the first conductor Sx-1 and the second conductor Sx-2. This ensures that the current and resistance of the first conductor Sx-1 and the second conductor Sx-2 are equal, which helps reduce energy loss. Excessive resistance leads to heat generation, thereby reducing the efficiency of the motor. Balanced resistance ensures that the heat generated by the motor during operation is evenly distributed, avoiding localized overheating and thus improving overall operating efficiency. Simultaneously, when the current and resistance in the windings are balanced, winding aging caused by uneven heating is reduced, extending the motor's lifespan. Furthermore, balanced current and resistance contribute to a more uniform magnetic flux distribution, reducing magnetic flux harmonics and consequently minimizing vibration and noise during motor operation. Additionally, a balanced winding design helps improve the motor's starting and running performance, especially in applications requiring smooth operation and low noise, such as high-performance motors.

[0089] like Figure 7-8 As shown, as an optional embodiment of this case, in each of the stator slots S, at least the cross-sectional areas of the other conductors Sx-y besides the first conductor Sx-1 and the second conductor Sx-2 are equal, thereby helping to reduce energy loss, improve motor efficiency, and improve the starting and running performance of the motor.

[0090] like Figure 7-8 As shown, as an optional embodiment of this case, the winding is a three-phase winding, and each phase of the winding is evenly spaced at electrical angles of 120° along the circumference of the stator core.

[0091] It should be noted that when the solution in this case is applied to a three-phase motor, when three-phase AC power is applied to the stator windings of the three-phase motor, the electrical angle of each phase differs by 120°, generating a rotating magnetic field. This rotating magnetic field can effectively cut the rotor windings, thereby inducing current in the rotor windings and causing the motor to rotate. In this case, by continuously improving the uniformity of the motor winding distribution, such as by alternating, spacing, and staggering the windings of different phases, the three-phase 120° staggered winding design helps to weaken the harmonic components in the air gap magnetic field, especially the 3kth harmonic magnetomotive force, which is beneficial for the motor's vibration reduction and noise reduction. Regarding improving motor efficiency, by optimizing the winding layout, energy loss caused by harmonics can be reduced, especially the conductor Sx-y AC loss in the high-speed region, thereby improving the motor's efficiency and performance. Regarding stabilizing motor operation, it helps to maintain the stability of the motor during operation.

[0092] The third embodiment of this case:

[0093] like Figure 8-10 As shown, as an optional embodiment of this case, two stator slots S constitute a stator slot set, and a predetermined number of other stator slots S are spaced apart between the two stator slots S in the stator slot set; in the stator slot set, the first conductor Sx-1 in one stator slot S is connected to the second conductor Sx-2 in the other stator slot S to form a coil unit.

[0094] It should be noted that the stator slot set in this case contains a predetermined number of stator slots S, the stator slot group in this case contains a predetermined number of stator slot sets, and the stator slot group array in this case contains a predetermined number of stator slot groups. In this case, the number of stator slots S, the number of stator slot sets, the number of stator slot groups, the stator slot group array, and the number of windings in each phase are the same and are evenly arranged along the circumference of the stator core. In this case, the winding method of all embodiments mainly focuses on optimizing the winding method of the conductor Sx-y near the slot opening S0. For example, the winding method of the first conductor Sx-1 and the second conductor Sx-2 is optimized. The description of stator slot set, stator slot group, and stator slot group array is based on the conductor Sx-y near the slot opening S0 of the stator slot S, such as the winding method of the first conductor Sx-1 and the second conductor Sx-2. In this case, the winding method of other conductors Sx-y besides at least the first conductor Sx-1 and the second conductor Sx-2 is not described in detail. The same winding method as in this case or other winding methods can be selected according to actual needs.

[0095] Regarding the description of some of the illustrations in this specification, Figure 8S1-S48 in the figure represent the corresponding stator slots S respectively; each stator slot S in the figure has six layers, and the cross-sectional area of ​​the conductors Sx-y in the first and second layers of each stator slot S is smaller than the cross-sectional area of ​​the conductors Sx-y in the other layers. Figure 9 The diagram shows the connection method of the first conductor Sx-1 and the second conductor Sx-2 in each stator slot group of each phase winding. The connection method is similar to... Figure 8 and Figure 10 The wiring method within each stator slot S corresponds to the following; Figure 10 The diagram illustrates the connection of the first conductor Sx-1 and the second conductor Sx-2 in a U-phase stator slot array. Figure A shows a schematic diagram of the connection between the first conductor Sx-1 and the second conductor Sx-2 in one stator slot group to form a winding unit. All the conductors B in the diagram constitute one stator slot group, and all the conductors C in the diagram constitute another stator winding. Figure D shows a schematic diagram of the connection between the first conductor Sx-1 and the second conductor Sx-2 in another stator slot group to form a winding unit. It should be understood that... Figure 10 The lines in A, B, D, and E do not represent the actual winding structure. The diagram is only used to clearly illustrate the conductor connections in each stator slot S. For the actual winding structure diagram, please refer to [reference needed]. Figure 11 Where U represents the winding of phase U, V represents the winding of phase V, and W represents the winding of phase W.

[0096] It should be noted that two stator slots S constitute a set of stator slots. For example, in phase U of this case, the two stator slots S in a set of stator slots can be S1 and S6, S13 and S18, S25 and S30, or S37 and S42. In this example, the set of stator slots is spaced four times apart. A predetermined number of other stator slots S are spaced between the two stator slots S in a set of stator slots. For example, the two stator slots S1 and S6 in the set of stator slots are spaced four times apart, namely S2, S3, S4, and S5; the two stator slots S13 and S18 in the set of stator slots are spaced four times apart, namely S14, S15, S16, and S17. In one set of stator slots, the first conductor Sx-1 in one stator slot S is connected to the second conductor Sx-2 in another stator slot S to form a coil unit. For example, in stator slots S1 and S6 of the set of stator slots, the first conductor S1-1 in stator slot S1 is connected to the second conductor S6-2 in stator slot S6 to form a coil unit, and the first conductor S6-1 in stator slot S6 is connected to the second conductor S1-2 in stator slot S1 to form a coil unit. As another example, in stator slots S13 and S18 of the set of stator slots, the first conductor S13-1 in stator slot S13 is connected to the second conductor S18-2 in stator slot S18 to form a coil unit, and the first conductor S18-1 in stator slot S18 is connected to the second conductor S13-2 in stator slot S13 to form a coil unit.

[0097] It should be noted that in existing technologies, circulating currents in motors generate additional heat and energy loss inside the motor, reducing its efficiency. Circulating currents may also put additional stress on the motor windings and other components, thus shortening the equipment's lifespan. Furthermore, circulating currents affect the motor's operational stability, potentially leading to performance degradation or malfunction. In this case, the first conductor Sx-1 in one stator slot S of a set of stator slots is connected to the second conductor Sx-2 in another stator slot S to form a coil unit, thus creating a misaligned connection. This avoids or reduces circulating currents, thereby preventing or reducing additional losses and ensuring the motor's efficient and stable operation. This invention, by having two stator slots S form a stator slot set, with a predetermined number of other stator slots S spaced between the two stator slots S in the stator slot set, allows the windings of the same phase to pass sequentially through the two stator slots S in the stator slot set. This achieves a more uniform winding distribution, balances the force waves generated by the electromagnetic force between the motor rotor and the motor stator, thereby reducing vibration and noise during motor operation. At the same time, the more uniform winding distribution helps to form a more regular and harmonious magnetic field distribution, which is beneficial to improving the efficiency and output power of the motor.

[0098] like Figure 8-10 As shown, as an optional embodiment of this case, a group of stator slots arranged at uniform intervals along the axial direction of the stator core constitutes a stator slot group, and each coil unit in the same stator slot group is connected in series along the circumference of the stator core to form a winding unit.

[0099] It should be noted that multiple sets of stator slots arranged at uniform intervals along the axial direction of the stator core constitute a stator slot group. For example, taking a three-phase 48-slot motor stator as an example, Figure 8-10 As shown, multiple stator slot sets (S1 and S6, S13 and S18, S25 and S30, S37 and S42) together constitute a stator slot group. For example, stator slot sets (S7 and S12, S19 and S24, S31 and S36, S43 and S48) together constitute another stator slot group. The coil units within the same stator slot group are connected in series along the circumference of the stator core to form a winding unit. For example, the winding unit formed by the coil units in the stator slot group (S1 and S6, S13 and S18, S25 and S30, S37 and S42) connected in series axially is (S1-1, S6-2, S13-1, S18-2, S25-1, S30-2, S37-1, S42-2), where S6-2 represents the second conductor Sx-y of the second layer of the sixth stator slot S. This design, through a more precise winding layout, optimizes the magnetic field distribution of the motor, reduces magnetic flux leakage, reduces resistance loss, and improves winding factors, thereby enhancing the overall efficiency and performance output of the motor.

[0100] like Figure 8-10 As shown, as an optional embodiment of this case, at least two stator slot groups form a stator slot group array, and the stator slot sets of different stator slot groups in the same stator slot group array are alternately arranged along the circumference of the stator core, and the current phase of each winding unit in the same stator slot group array is consistent.

[0101] It should be noted that, for example, multiple sets of stator slots (S1 and S6, S13 and S18, S25 and S30, S37 and S42) together constitute a first stator slot group, and multiple sets of stator slots (S7 and S12, S19 and S24, S31 and S36, S43 and S48) together constitute a second stator slot group. This first and second stator slot group form a stator slot array, such as... Figure 8As shown in the figure, A represents a schematic diagram of the connection between the first conductor Sx-1 and the second conductor Sx-2 in the second stator slot group to form a winding unit. All Bs in the figure constitute a stator slot group, such as the second stator winding mentioned above. All Cs in the figure constitute another stator winding, such as the first stator winding mentioned above. D represents a schematic diagram of the connection between the first conductor Sx-1 and the second conductor Sx-2 in the first stator slot group to form a winding unit. The first stator slot group and the second stator slot group can constitute a stator slot array, such as a stator slot array of the U-phase winding. The stator slot sets of different stator slot groups in the same stator slot array are alternately arranged along the circumference of the stator core, such as... Figure 10 As shown, for example, the multiple stator slot sets (S1 and S6, S13 and S18, S25 and S30, S37 and S42) in the first stator slot group and the multiple stator slot sets (S7 and S12, S19 and S24, S31 and S36, S43 and S48) in the second stator slot group are arranged alternately in the circumferential direction. The current phase of each winding unit in the same stator slot array is consistent. For example, winding units (S1-1, S6-2, S13-1, S18-2, S25-1, S30-2, S37-1, S42-2), winding units (S1-2, S6-1, S13-2, S18-1, S25-2, S30-1, S37-2, S42-1), and winding units (S7-1, S12-2, S19-1, S24-2, S31) -1, S36-2, S43-1, S48-2), and winding units (S7-2, S12-1, S19-2, S24-1, S31-2, S36-1, S43-2, S48-1) are all U-phase windings in the windings, that is, the windings in each stator slot array are windings with the same phase. By accurately arranging the stator slot set in the stator slot array, the accurate arrangement of windings with the same phase is achieved, which is beneficial to improving the overall efficiency and performance output of the motor.

[0102] like Figure 8-10 As shown, as an optional embodiment of this case, at least three stator slot groups are arranged in a staggered manner along the circumference of the stator core, and the current phase of the winding unit in different stator slot groups is different.

[0103] It should be noted that the U-phase stator slot sets (S1 and S6, S13 and S18, S25 and S30, S37 and S42) together form one stator slot group; the V-phase stator slot sets (S4 and S9, S16 and S21, S28 and S33, S40 and S47) together form one stator slot group; and the W-phase stator slot sets (S9 and S14, S21 and S26, S33 and S38, S45 and S2) together form one stator slot group. These U-phase, V-phase, and W-phase stator slot groups are arranged in a staggered manner along the axial direction of the stator core. See [link to details]. Figure 8 As shown, the current phase of the winding units in different stator slots is also different, thereby achieving a more uniform winding distribution, which helps to form a more regular and harmonious magnetic field distribution, and is beneficial to improving the efficiency and output power of the motor.

[0104] like Figure 8-10 As shown, as an optional embodiment of this case, any stator slot S of any stator slot group is located between two stator slots S of one stator slot set of other stator slot groups.

[0105] It should be noted that, for example, in phase U, a stator slot group consisting of multiple stator slot sets (S1 and S6, S13 and S18, S25 and S30, S37 and S42), other stator slot groups, and multiple stator slot sets within a stator slot group (S9 and S14, S21 and S26, S33 and S38, S45 and S2), wherein stator slot S1 is located between the stator slot sets (S45 and S2) of that stator slot group. As another example, stator slot S6 is located between the stator slot sets (S4 and S9) of other stator slot groups and between the stator slot sets (S5 and S10), thereby achieving a more uniform winding distribution, contributing to a more regular and harmonious magnetic field distribution, and improving motor efficiency and output power.

[0106] Fourth embodiment of this case:

[0107] This embodiment is completely different from the second embodiment described above. Specifically, in the same stator slot S, the first conductor Sx-1 and the second conductor Sx-2 are electrically connected to both ends of the stator core.

[0108] It should be noted that, as the first conductor Sx-1 and the second conductor Sx-2 are short-circuited at both ends of the stator core by welding, the short-circuit length should meet actual usage requirements, while minimizing material consumption, and the connection must be secure. At high motor speeds, the skin effect causes current to concentrate primarily on the surface of conductor Sx-y, resulting in uneven current density, thus generating additional losses and temperature rise. To address this issue, measures need to be taken to increase the surface area of ​​conductor Sx-y, thereby reducing current density and mitigating the skin effect. In this solution, since the first conductor Sx-1 and the second conductor Sx-2 are electrically connected at both ends of the stator core, and both conductor Sx-1 and the second conductor Sx-2 have complete insulating coatings, they are effectively a single conductor Sx-y. This wiring method not only increases the surface area of ​​conductor Sx-y but also makes the current distribution in the first conductor Sx-1 and the second conductor Sx-2 more uniform, effectively reducing the skin effect and minimizing losses caused by uneven current density. In the second embodiment described above, the first conductor Sx-1 and the second conductor Sx-2 in each stator slot S are independent flat conductors in the composite conductor 10, rather than the same flat conductor Sx-y. Although this increases the surface area of ​​the conductor Sx-y in the winding, since the first conductor Sx-1 and the second conductor Sx-2 in the same stator slot S are independent, the uniformity of current distribution between adjacent flat conductors Sx-y cannot be fully utilized. Therefore, when the winding method and other structures in the second and third embodiments are the same, at high speeds, the solution in the second embodiment will not be as effective as the solution in the third embodiment in reducing the skin effect.

[0109] Fifth embodiment of this case:

[0110] This utility model also provides an electric motor, including the aforementioned motor stator, thereby making the electric motor having the aforementioned motor stator also within the protection scope of this case.

[0111] This utility model also provides a vehicle including the aforementioned motor, thereby making vehicles with the aforementioned motor also within the protection scope of this application, such as new energy vehicles.

[0112] In summary, this utility model effectively overcomes some practical problems in the prior art, thus having high utilization value and significance.

[0113] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A composite conductor, characterized in that, include: The conductor body includes at least two bare conductors, which are arranged in parallel and side by side and fitted together. An insulating dielectric layer is disposed between the mating surfaces of adjacent bare conductors to block the lateral flow of current between adjacent bare conductors; An external insulation layer covers the outer surface of the conductor body.

2. The composite conductor according to claim 1, characterized in that, The insulating dielectric layer is an organic insulating layer, an inorganic insulating layer, a composite insulating layer, or a metal oxide layer with voltage resistance.

3. The composite conductor according to claim 2, characterized in that, The metal oxide layer is an oxide layer generated in situ on the surface of at least one of the bare conductors.

4. The composite conductor according to claim 3, characterized in that, The bare conductor is made of copper, and the metal oxide layer is copper oxide on the surface of the bare conductor; or the bare conductor is made of aluminum, and the metal oxide layer is aluminum oxide on the surface of the bare conductor.

5. The composite conductor according to claim 1, characterized in that, The bare conductor is made of conductive metal or conductive alloy, and the surfaces of adjacent bare conductors that are at least close to each other are provided with an insulating coating or insulating cover.

6. The composite conductor according to claim 1, characterized in that, The cross-sectional shape of the bare conductor is flat, polygonal, rectangular, or trapezoidal.

7. The composite conductor according to claim 1, characterized in that, The bare conductors are fixed together by an adhesive, which is a high-temperature resistant insulating adhesive or a thermosetting resin with insulating properties.

8. A motor winding structure, characterized in that, The composite conductor included in any one of claims 1-7, wherein the composite conductor is bent or three-dimensionally shaped to form a winding unit.

9. A motor stator, characterized in that, include: A stator core has multiple stator slots arranged circumferentially, and the stator slots include slot openings near the center of the stator core; The winding includes multiple conductors arranged radially along the stator core in the stator slot, wherein at least the first conductor and the second conductor have a smaller cross-sectional area than the other conductors, and wherein the first conductor and the second conductor are two conductors continuously arranged in the slot in a direction away from the center of the stator core. Wherein, at least the first conductor and the second conductor are combined into a composite conductor, the composite conductor comprising: The conductor body includes at least two bare conductors, which are arranged in parallel and side by side and fitted together. An insulating dielectric layer is disposed between the mating surfaces of adjacent bare conductors to block the lateral flow of current between adjacent bare conductors; An external insulation layer covers the outer surface of the conductor body.

10. The motor stator according to claim 9, characterized in that, The width of each conductor in each stator slot gradually increases from the slot opening towards the center of the stator core along the radial direction of the stator core. The width of each stator slot adapts to the change in the width of the conductor.

11. The motor stator according to claim 10, characterized in that, In each of the stator slots, the sum of the cross-sectional areas of at least the first conductor and the second conductor is less than or equal to the cross-sectional area of ​​the other individual conductors.

12. The motor stator according to claim 10, characterized in that, In each of the stator slots, at least the first conductor and the second conductor have equal cross-sectional areas.

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