Motor and electric vehicle

Abstract

The utility model relates to the technical field of motors, in particular to a motor and an electric automobile, the motor comprises a stator assembly, the stator assembly comprises a stator core and a wire unit, the stator core is in an annular cylinder shape, the inner side of the stator core is provided with a plurality of stator grooves, the plurality of stator grooves are arranged at intervals along the circumferential direction of the stator core, and the wire unit comprises a plurality of wires. The plurality of wires are arranged in the stator slots side by side along the radial direction of the stator core; the wire comprises an insulating layer and a metal conductor located in the insulating layer, the insulating layer is provided with four first side walls adjacent in sequence, the metal conductor is provided with four second side walls adjacent in sequence, the first side walls and the second side walls are attached in a one-to-one correspondence mode, and the shapes of the corresponding first side walls and the second side walls are matched. The at least one first side wall is recessed towards the center of the wire, the first side wall is configured to define at least part of a cooling oil way, and the cooling oil way is configured to allow cooling oil to circulate. The stator slots of the motor are high in slot fullness rate.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor and an electric vehicle. Background Art

[0002] At present, electric vehicles, as the main type of new energy vehicles, are developing rapidly. As the main driving system of electric vehicles, improving the performance of electric drive systems plays an important role in improving the power performance of electric vehicles. Among them, the temperature rise of the motor of the electric drive system is a difficult link to overcome.

[0003] In the related art, there are two main ways to dissipate heat for motors: direct oil cooling and indirect oil cooling. The direct oil cooling includes oil immersion and oil spraying. The oil immersion cooling is to immerse the stator and rotor of the motor in cooling oil for cooling. When the stator is cooled by oil immersion, it is necessary to reserve a gap in the stator slot to form an oil path for the cooling oil to flow. For example, in the related art, a special-shaped flat wire is used, and the gap between the flat wires forms an oil path, or the gap between the flat wire and the slot wall of the stator slot forms an oil path. However, in this special-shaped flat wire, the thickness of the outer sheath is uneven, and the thicker area will occupy additional space in the wire core, which will reduce the slot fill rate of the stator slot. The reduction in the slot fill rate will reduce the power of the motor, which is not conducive to improving the power performance of the motor. Utility Model Content

[0004] Based on this, the present application provides a motor and an electric vehicle to solve the deficiencies in the related art.

[0005] In a first aspect, the present application provides a motor, including a stator assembly, the stator assembly including a stator core and a wire unit, the stator core is in a circular cylindrical shape, the inner side of the stator core has a stator slot, a plurality of stator slots are arranged at intervals along the circumferential direction of the stator core, the wire unit includes a plurality of wires, and the plurality of wires are arranged side by side in the stator slots along the radial direction of the stator core;

[0006] The conductor includes an insulating layer and a metal conductor located in the insulating layer, the insulating layer has four first side walls adjacent to each other in sequence, the metal conductor has four second side walls adjacent to each other in sequence, each first side wall and each second side wall are arranged in a one-to-one correspondence, and the shapes of the corresponding first side walls and second side walls are matched, at least one first side wall is recessed toward the center of the conductor, and the first side wall is configured to enclose at least a portion of a cooling oil circuit, and the cooling oil circuit is configured to allow cooling oil to circulate.

[0007] In a possible implementation, in the motor provided by the present application, two opposite first side walls are both recessed toward the center of the wire, and a cooling oil path is formed between two adjacent wires;

[0008] Alternatively, a cooling oil passage is formed between the conductive wire and the slot wall of the stator slot.

[0009] In a possible implementation, in the motor provided by the present application, the four first side walls are all recessed toward the center of the wire, and a cooling oil path is formed between two adjacent wires and between the wire and the slot wall of the stator slot.

[0010] In one possible implementation, the motor provided in the present application, the first side wall includes a first arc segment and two second arc segments connected to each other, the two second arc segments are located on both sides of the first arc segment, the bending direction of the first arc segment is away from the center of the conductor, and the bending direction of the second arc segment is toward the center of the conductor.

[0011] In a possible implementation, the motor provided by the present application, the stator slot includes a first region, and the cross section of the first region along the axial direction of the stator core is rectangular;

[0012] Alternatively, the first region has a trapezoidal cross section along the axial direction of the stator core.

[0013] In a possible implementation, in the motor provided by the present application, the cross-sectional areas of the conductors in the same stator slot are equal.

[0014] In a possible implementation, in the motor provided in the present application, the slot wall of the stator slot has convex points, and a plurality of convex points are dispersedly arranged in the stator slot.

[0015] In one possible implementation, the motor provided in the present application, the stator slot also includes a second area adjacent to the first area, the second area is located on a side of the stator slot close to the inner side of the stator core, and the second area has a wire inlet on a side facing away from the first area, and the wire inlet is constructed to allow the wire to pass into the stator slot.

[0016] In a possible implementation, the motor provided in the present application has a stator core comprising silicon steel sheets, and a plurality of silicon steel sheets are welded in sequence in the axial direction to form the stator core.

[0017] In a second aspect, the present application provides an electric vehicle, including a vehicle body and an electric drive system, wherein the electric drive system includes the motor provided in the first aspect, and the motor is arranged in the vehicle body.

[0018] The present application provides a motor and an electric vehicle, wherein the motor includes a stator assembly, the stator assembly includes a stator core and a wire unit, the stator core includes a stator slot, the wire unit includes a wire, and the wire includes an insulating layer and a metal conductor. By setting a stator slot for installing the wire unit, by setting a metal conductor for transmitting current, by setting an insulating layer for insulating and protecting the metal conductor, at least one first side wall is recessed toward the center of the wire to form a wire with a special-shaped cross-section, thereby forming a gap between adjacent wires, and / or, a gap is formed between the wire and the slot wall of the stator slot for cooling oil to flow, thereby dissipating heat for the motor, by correspondingly fitting the first side wall and matching the shape of the second side wall, so that in the special-shaped wire, the wall thickness of the first side wall is more uniform, so as to avoid the uneven wall thickness of the first side wall and the extra occupation of the wire cross-section, thereby increasing the proportion of the metal conductor in the wire, thereby increasing the proportion of the metal conductor in the stator slot, thereby increasing the slot fill rate of the stator slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a stator assembly in a motor provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A partial enlarged view of the dotted box in the middle;

[0022] Figure 3 A schematic diagram of the structure of a stator core in a motor provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of the wires in the motor provided in the embodiment of the present application;

[0024] Figure 5 for Figure 3 A partial enlarged view of the dotted box in the middle.

[0025] Description of reference numerals:

[0026] 10- stator assembly;

[0027] 100- stator core; 110- stator slot; 111- first area; 112- cooling oil circuit; 113- second area; 114- line inlet;

[0028] 200 - conductor unit; 210 - conductor; 211 - insulation layer; 2111 - first side wall; 212 - metal conductor; 2121 - second side wall. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] The terms "first", "second", "third" (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0033] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0034] At present, electric vehicles, as the main type of new energy vehicles, are developing rapidly. As the main driving system of electric vehicles, improving the performance of electric drive systems plays an important role in improving the power performance of electric vehicles. Among them, the temperature rise of the motor of the electric drive system is a difficult link to overcome.

[0035] In the related art, there are two main ways to dissipate heat for motors: direct oil cooling and indirect oil cooling. The direct oil cooling includes oil immersion and oil spraying. The oil immersion cooling is to immerse the stator and rotor of the motor in cooling oil for cooling. When the stator is cooled by oil immersion, it is necessary to reserve a gap in the stator slot to form an oil path for the cooling oil to flow. For example, in the related art, a special-shaped flat wire is used, and the gap between the flat wires forms an oil path, or the gap between the flat wire and the slot wall of the stator slot forms an oil path. However, in this special-shaped flat wire, the thickness of the outer sheath is uneven, and the thicker area will occupy additional space in the wire core, which will reduce the slot fill rate of the stator slot. The reduction in the slot fill rate will reduce the power of the motor, which is not conducive to improving the power performance of the motor.

[0036] In view of the above problems, an embodiment of the present application provides a motor and an electric vehicle, wherein the stator assembly of the motor adopts a special-shaped wire, and the second side wall of the metal conductor in the wire and the first side wall of the insulating layer are matched to increase the proportion of the cross-sectional area of ​​the metal conductor in the cross-sectional area of ​​the wire, thereby increasing the proportion of the cross-sectional area of ​​the metal conductor in the cross-sectional area of ​​the stator slot, thereby increasing the slot fill rate of the stator slot.

[0037] The technical solutions of the motor and the electric vehicle provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0038] It should be noted that the motor provided in the embodiment of the present application refers to an electromagnetic device that realizes electric energy conversion or transmission based on the law of electromagnetic induction. Its main function is to convert electric energy into mechanical energy. Therefore, the motor provided in the embodiment of the present application can be used to drive electric vehicles or other mechanical devices.

[0039] Reference Figures 1 to 4As shown, the motor provided in the embodiment of the present application includes a stator assembly 10, which includes a stator core 100 and a wire unit 200. The stator core 100 is in the shape of an annular cylinder, and the inner side of the stator core 100 has a stator slot 110, and a plurality of stator slots 110 are arranged at intervals along the circumferential direction of the stator core 100. The wire unit 200 includes a plurality of wires 210, and the plurality of wires 210 are arranged side by side in the stator slots 110 along the radial direction of the stator core 100.

[0040] The wire 210 includes an insulating layer 211 and a metal conductor 212 located in the insulating layer 211, the insulating layer 211 has four first side walls 2111 adjacent to each other in sequence, the metal conductor 212 has four second side walls 2121 adjacent to each other in sequence, each first side wall 2111 and each second side wall 2121 are arranged in a one-to-one correspondence, and the shapes of the corresponding first side walls 2111 and second side walls 2121 are matched, at least one first side wall 2111 is recessed toward the center of the wire 210, and the first side wall 2111 is constructed to enclose at least a portion of the cooling oil circuit 112, and the cooling oil circuit 112 is constructed to allow cooling oil to circulate.

[0041] It can be understood that the motor can also include a rotor assembly. The stator assembly 10 is used to generate an input current, thereby generating a rotating magnetic field. The rotor assembly cuts the magnetic induction lines, thereby generating an induced electromotive force and current, and forming an electromagnetic torque output. In this way, the stator assembly 10 and the rotor assembly cooperate with each other, so that the motor converts electrical energy into mechanical energy.

[0042] In the present application, the stator assembly 10 may include a stator core 100 and a wire unit 200. The stator core 100 is used to form a magnetic circuit of the motor and to install the wire unit 200. The wire unit 200 is wound around the stator core 100 and is used to pass current, thereby causing the stator assembly 10 to generate a magnetic field, thereby driving the rotor assembly to rotate and generate torque.

[0043] Specifically, the inner side of the stator core 100 has a plurality of stator slots 110, and the plurality of stator slots 110 are arranged at intervals along the circumference of the stator core 100. The stator slots 110 are used to install and fix the wire unit 200, and a plurality of wires 210 are inserted in each stator slot 110. The plurality of wires 210 are arranged in the stator slots 110 along the radial direction of the stator core 100.

[0044] It should be noted that the slot fill rate refers to the ratio of the effective area of ​​the stator slot 110 occupied by the wire unit 200 after it is placed in the stator slot 110, and also refers to the ratio of the cross-sectional area occupied by the metal conductor 212 of the wire unit 200 in the stator slot 110 to the total space of the bare slot of the stator slot 110.

[0045] In the related art, the special-shaped flat wire mainly makes the outer sheath of the flat wire form a non-rectangular cross-sectional shape, while the wire core located inside the flat wire still adopts a rectangular cross-sectional shape. In this way, the thickness of the outer sheath is uneven. In places where the thickness of the outer sheath is thicker, the outer sheath occupies more of the flat wire cross-sectional area, thereby reducing the proportion of the cross-sectional area of ​​the wire core in the cross-sectional area of ​​the flat wire.

[0046] The wire 210 provided in the embodiment of the present application may include an insulating layer 211 and a metal conductor 212 located in the insulating layer 211, the metal conductor 212 is used to transmit current, and the insulating layer 211 is used to insulate and protect the metal conductor 212. The thickness of the insulating layer 211 is evenly distributed along the circumferential direction of the wire 210. That is to say, when a special-shaped wire 210 with a non-rectangular cross-section is used, not only the cross-sectional shape of the insulating layer 211 is non-rectangular, but also the cross-sectional shape of the metal conductor 212 is non-rectangular. In this way, relative to the wire core with a rectangular cross-section, the proportion of the metal conductor 212 with the same cross-sectional shape as the wire 210 in the wire 210 can be increased, thereby increasing the slot fill rate of the stator slot 110, thereby increasing the power of the motor, and for motors of the same power, the motor with a higher slot fill rate has a smaller length. In addition, increasing the slot fill rate of the stator slot 110 can reduce the use of some motor materials, thereby increasing the utilization rate of the motor materials, thereby reducing the material cost of the motor.

[0047] Specifically, the insulating layer 211 has four first side walls 2111 adjacent to each other in sequence, and the metal conductor 212 has four second side walls 2121 adjacent to each other in sequence. The shapes of the first side wall 2111 and the second side wall 2121 match each other to facilitate the fit between the first side wall 2111 and the second side wall 2121, and to increase the proportion of the metal conductor 212 in the wire 210, thereby increasing the slot fill rate of the stator slot 110.

[0048] Among them, at least one first side wall 2111 and the corresponding second side wall 2121 are recessed toward the center of the wire 210 so as to form a gap between two adjacent wires 210, and / or, to form a gap between the wire 210 and the slot wall of the stator slot 110. The above gap can form a cooling oil path 112 for the flow of cooling oil to facilitate heat dissipation for the motor.

[0049] Exemplarily, one first side wall 2111 may be recessed toward the center of the conductor 210, or two adjacent first side walls 2111 may be recessed toward the center of the conductor 210, or two opposite first side walls 2111 may be recessed toward the center of the conductor 210, or three sequentially adjacent first side walls 2111 may be recessed toward the center of the conductor 210, or all four first side walls 2111 may be recessed toward the center of the conductor 210.

[0050] No matter how many first side walls 2111 are recessed toward the center of the conductor 210, the second side walls 2121 corresponding to the first side walls 2111 are also recessed toward the center of the conductor 210. In this way, the wall thickness of the first side walls 2111 can be made uniform, and the proportion of the metal conductor 212 in the conductor 210 is increased, thereby increasing the proportion of the metal conductor 212 in the stator slot 110, thereby increasing the slot fill rate of the stator slot 110.

[0051] The motor provided by the embodiment of the present application includes a stator assembly 10 , wherein the stator assembly 10 includes a stator core 100 and a wire unit 200 , wherein the stator core 100 includes stator slots 110 , the wire unit 200 includes a wire 210 , and the wire 210 includes an insulating layer 211 and a metal conductor 212 . By providing a stator slot 110 for installing the wire unit 200, by providing a metal conductor 212 for transmitting current, by providing an insulating layer 211 for insulating and protecting the metal conductor 212, at least one first side wall 2111 is recessed toward the center of the wire 210 to form a wire 210 with an irregular cross-section, thereby forming a gap between adjacent wires 210, and / or, a gap is formed between the wire 210 and the slot wall of the stator slot 110 for cooling oil to flow, thereby dissipating heat for the motor, and by correspondingly fitting the first side wall 2111 and the second side wall 2121 and matching their shapes, so that in the irregular wire 210, the wall thickness of the first side wall 2111 is relatively uniform, so as to avoid the uneven wall thickness of the first side wall 2111 and the extra occupation of the cross-section of the wire 210, thereby increasing the proportion of the metal conductor 212 in the wire 210, and thereby increasing the proportion of the metal conductor 212 in the stator slot 110, thereby increasing the slot fill rate of the stator slot 110.

[0052] Reference Figure 2 and Figure 4 As shown, in order to facilitate the processing of the wire 210, in a possible implementation, the two opposite first side walls 2111 are recessed toward the center of the wire 210, and a cooling oil path 112 is formed between two adjacent wires 210. Alternatively, a cooling oil path 112 is formed between the wire 210 and the slot wall of the stator slot 110.

[0053] It should be noted that when a plurality of conductive wires 210 are sequentially arranged in the stator slot 110 along the radial direction of the stator core 100, if the concave direction of the first side wall 2111 points to the inside of the stator core 100 or to the outside of the stator core 100, there is a gap between two adjacent first side walls 2111, and the gap forms a cooling oil path 112 for the flow of cooling oil. If the concave direction of the first side wall 2111 is along the circumferential direction of the stator core 100 and points to the inside of the stator slot 110, there is a gap between the first side wall 2111 and the slot wall of the stator slot 110, and the gap forms a cooling oil path 112 for the flow of cooling oil.

[0054] In some embodiments, the four first side walls 2111 are all recessed toward the center of the wire 210 , and a cooling oil path 112 is formed between two adjacent wires 210 and between the wire 210 and the slot wall of the stator slot 110 .

[0055] In this way, since the four first side walls 2111 are all recessed toward the center of the wire 210, when a plurality of wires 210 are arranged in sequence in the stator slot 110 along the radial direction of the stator core 100, there is not only a gap between two adjacent wires 210, but also a gap between the wire 210 and the slot wall of the stator slot 110. The above gaps form a cooling oil path 112 for the flow of cooling oil, which can effectively improve the heat dissipation performance of the motor.

[0056] In a specific implementation, the first side wall 2111 includes a first arc segment and two second arc segments connected to each other, the two second arc segments are located on both sides of the first arc segment, the bending direction of the first arc segment is away from the center of the wire 210, and the bending direction of the second arc segment is toward the center of the wire 210.

[0057] That is to say, in the adjacent first side walls 2111, the second arc segments are connected to each other to form a rounded corner, and the first arc segment is a recessed portion in the first side wall 2111, so that it is convenient for the metal conductor 212 to be rolled and the insulating layer 211 to be injection molded.

[0058] Reference Figure 5 As shown, in some embodiments, the stator slot 110 includes a first region 111 , and the cross section of the first region 111 along the axial direction of the stator core 100 is rectangular.

[0059] Alternatively, in some embodiments, a cross section of the first region 111 along the axial direction of the stator core 100 is trapezoidal.

[0060] That is to say, the cross-sectional shape of the first area 111 for accommodating each wire 210 can be rectangular or trapezoidal. The rectangular stator slot 110 is used in conjunction with the special-shaped wire 210, which has low process difficulty and is easy to process. When it is necessary to further improve the slot filling rate of the stator slot 110, the cross-sectional shape of the first area 111 along the axial direction of the stator core 100 can be set to a trapezoid, so as to form a cooling oil path 112 with a smaller gap between the wire 210 and the slot wall of the stator slot 110, thereby increasing the proportion of the wire unit 200 in the stator slot 110. In this way, the internal space of the stator core 100 can be utilized to the maximum extent to improve the slot filling rate of the stator slot 110 without changing the outer dimensions of the stator core 100.

[0061] It should be noted that when a trapezoidal stator slot 110 is used, in order to ensure that the current carrying capacity of each conductor 210 is consistent, in a possible implementation, the cross-sectional areas of each conductor 210 in the same stator slot 110 are equal.

[0062] In this way, the cross-sectional areas of the metal conductors 212 in the various wires 210 can be ensured to be equal, thereby ensuring that the current carrying capacity of the various wires 210 is the same, thereby improving the current carrying capacity of the wire unit 200 .

[0063] In a possible implementation, in the motor provided in the present application, the slot wall of the stator slot 110 has a convex point, and a plurality of the convex points are dispersedly arranged in the stator slot 110 .

[0064] In this way, by setting convex points on the slot wall of the stator slot 110, the total space of the bare slot of the stator slot 110 is reduced, thereby improving the slot fill rate of the stator slot 110, and disturbing the cooling oil when it flows through the convex points, thereby improving the cooling efficiency of the cooling oil circuit 112.

[0065] In specific configuration, the bumps may be symmetrically arranged on both sides of the first region 111 in the height direction, and the bumps may be arranged between two adjacent conductive lines 210 to fix the conductive lines 210 .

[0066] Reference Figure 5 As shown, in a possible implementation, the stator slot 110 also includes a second area 113 adjacent to the first area 111, the second area 113 is located on a side of the stator slot 110 close to the inner side of the stator core 100, and the side of the second area 113 facing away from the first area 111 has an inlet 114, and the inlet 114 is configured to allow the wire 210 to pass into the stator slot 110.

[0067] This facilitates the assembly of the stator assembly 10 . During assembly, each wire 210 can be inserted into the stator slot 110 in sequence through the wire inlet 114 , and then wound around the stator core 100 to assemble and form an integrated stator assembly 10 .

[0068] In a specific implementation, the stator core 100 includes silicon steel sheets, and a plurality of silicon steel sheets are welded in sequence in the axial direction to form the stator core 100. The number of silicon steel sheets can be determined according to the parameters of the motor so that the axial length of the stator core 100 meets the requirements.

[0069] In addition, the present application provides an electric vehicle, including a vehicle body and an electric drive system, the electric drive system including a motor, the motor being arranged on the vehicle body, the motor including a stator assembly 10, the stator assembly 10 including a stator core 100 and a wire unit 200, the stator core 100 being in the shape of an annular cylinder, the inner side of the stator core 100 having a stator slot 110, a plurality of stator slots 110 being arranged at intervals along the circumferential direction of the stator core 100, the wire unit 200 including a plurality of wires 210, the plurality of wires 210 being arranged side by side in the stator slots 110 along the radial direction of the stator core 100. The wire 210 includes an insulating layer 211 and a metal conductor 212 located in the insulating layer 211, the insulating layer 211 has four first side walls 2111 adjacent to each other in sequence, the metal conductor 212 has four second side walls 2121 adjacent to each other in sequence, each first side wall 2111 and each second side wall 2121 are arranged in a one-to-one correspondence, and the shapes of the corresponding first side walls 2111 and second side walls 2121 are matched, at least one first side wall 2111 is recessed toward the center of the wire 210, and a cooling oil path 112 is provided in the stator slot 110, and the cooling oil path 112 is configured to allow cooling oil to circulate. By fitting the first side wall 2111 and the second side wall 2121 correspondingly and matching their shapes, the wall thickness of the first side wall 2111 is relatively uniform in the irregularly shaped conductor 210, so as to avoid the uneven wall thickness of the first side wall 2111 and the additional occupation of the cross-section of the conductor 210, thereby increasing the proportion of the metal conductor 212 in the conductor 210, and further increasing the proportion of the metal conductor 212 in the stator slot 110, thereby improving the slot fill rate of the stator slot 110.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor, characterized in that: The invention comprises a stator assembly, wherein the stator assembly comprises a stator core and a wire unit, wherein the stator core is in a circular cylindrical shape, wherein the inner side of the stator core has stator slots, wherein a plurality of stator slots are arranged at intervals along the circumferential direction of the stator core, and wherein the wire unit comprises a plurality of wires, wherein the plurality of wires are arranged side by side in the stator slots along the radial direction of the stator core; The conductive wire comprises an insulating layer and a metal conductor in the insulating layer, the insulating layer having four first side walls adjacent to each other in sequence, the metal conductor having four second side walls adjacent to each other in sequence, the first side walls and the second side walls being arranged in a one-to-one correspondence, and the shapes of the corresponding first side walls and the second side walls being arranged in a matching manner, at least one of the first side walls being recessed toward the center of the conductive wire, and the first side walls being configured to enclose at least a portion of a cooling oil circuit, wherein the cooling oil circuit is configured to allow cooling oil to flow.

2. The motor according to claim 1, characterized in that The two opposite first side walls are both recessed toward the center of the wire, and the cooling oil path is formed between two adjacent wires; Alternatively, the cooling oil passage is formed between the conductive wire and the slot wall of the stator slot.

3. The motor according to claim 2, characterized in that The four first side walls are all recessed toward the center of the conductor, and the cooling oil path is formed between two adjacent conductors and between the conductor and the slot wall of the stator slot.

4. The motor according to claim 3, characterized in that The first side wall includes a first arc segment and two second arc segments connected to each other, the two second arc segments are located on both sides of the first arc segment, the bending direction of the first arc segment is away from the center of the wire, and the bending direction of the second arc segment is toward the center of the wire.

5. The motor according to any one of claims 1 to 4, characterized in that: The stator slot includes a first region, the cross section of the first region along the axial direction of the stator core is rectangular; Alternatively, a cross section of the first region along the axial direction of the stator core is trapezoidal.

6. The motor according to claim 5, characterized in that The cross-sectional areas of the conductors in the same stator slot are equal.

7. The motor according to claim 5, characterized in that The slot wall of the stator slot has convex points, and a plurality of the convex points are dispersedly arranged in the stator slot.

8. The motor according to claim 5, characterized in that The stator slot also includes a second area adjacent to the first area, the second area is located on a side of the stator slot close to the inner side of the stator core, and the second area has a wire inlet on a side away from the first area, and the wire inlet is configured to allow the wire to pass into the stator slot.

9. The motor according to any one of claims 1 to 4, characterized in that: The stator core comprises silicon steel sheets, and a plurality of silicon steel sheets are welded in sequence in the axial direction of the stator core to form the stator core.

10. An electric vehicle, characterized in that: It comprises a vehicle body and an electric drive system, wherein the electric drive system comprises a motor as described in any one of claims 1 to 9, and the motor is arranged on the vehicle body.

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