Motor

Abstract

The invention discloses a motor. The motor comprises a stator core; the fixing plate is arranged on the back surface of the stator iron core along the axial direction of the motor and is attached to the back surface of the stator iron core; the fixed plate comprises a cooling channel and a plurality of inserts; the plurality of inserts are arranged on one side, close to the back surface of the stator iron core, of the fixed plate; wherein each insert and the corresponding cooling channel are arranged at intervals in the radial direction and are welded to the back face of the stator iron core, so that a welding area is formed. The stator core and the fixing plate can be connected in a welding fastening mode, screw-free assembling and fixing are achieved, the structure is simple, and the assembling efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a motor. Background Technology

[0002] The stator core of existing motors (such as new energy axial permanent magnet motors) needs to be fixed to the housing (or end cover). Currently, the common fixing method is to make fastening screw holes and internal threaded holes on the stator core and housing respectively. For example, the fastening screw holes are made on the housing and the internal threaded holes are made on the stator core, and the core is fixed from the outside to the inside with fastening screws; or the threaded holes are made on the housing and the fastening screw holes are made on the stator core, and the core is fixed from the inside to the outside with fastening screws.

[0003] However, this screw-fastening method often requires a large number of screws to meet the connection strength requirements. This necessitates that the cooling circuit of the housing avoid these screw holes, resulting in a complex cooling circuit structure, low cooling efficiency, and assembly difficulties. Furthermore, the numerous threaded holes formed on the stator core also affect the integrity of the stator core's magnetic field, reducing the motor's efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of low cooling efficiency and difficult assembly caused by the use of screws to fix the stator core in existing motors. This invention provides a motor in which the stator core and fixing plate are connected by welding, eliminating the need for screws, resulting in a simple structure and high assembly efficiency.

[0005] To solve the above-mentioned technical problems, an embodiment of the present invention discloses an electric motor comprising: a stator core; a fixing plate disposed on the back side of the stator core along the axial direction of the electric motor and in contact with the back side of the stator core; the fixing plate comprising a cooling channel and a plurality of inserts disposed on the side of the fixing plate near the back side of the stator core; wherein each insert is radially spaced from the cooling channel and welded to the back side of the stator core to form a welded area.

[0006] Using the above technical solution, in this embodiment of the application, the stator core is welded to the insert provided on the fixed plate to connect the stator core and the fixed plate. Thus, the stator core and the fixed plate do not need to be reassembled in this embodiment of the application, and the stator core does not need to have bolt holes. The back of the stator core is clean and tidy, avoiding machining of the stator core, and also increasing the overall strength of the stator core.

[0007] Therefore, compared with the existing method of fastening with screws, on the one hand, the stator core of this embodiment can fit tightly with the fixing plate, and the failure risk of the welded connection between the fixing plate and the stator core is low and the connection strength is high. Furthermore, the back of the stator core is flat and does not require threaded holes, which ensures the integrity of the magnetic field of the stator core and makes the magnetic circuit more saturated, thereby improving the efficiency of the motor of this embodiment.

[0008] On the other hand, the position distribution of the inserts on the fixing plate of this application embodiment relative to the stator core is flexible, and the position of the welding point formed by the stator core and the inserts is more free and not restricted by the bolt holes in the stator core. It can avoid the cooling channels provided on the fixing plate, which facilitates the layout of the cooling structure in the fixing plate of the motor of this application embodiment and has a good cooling effect.

[0009] According to another specific embodiment of the present invention, an electric motor is disclosed, wherein the stator core comprises silicon steel sheets and the insert is made of low carbon steel.

[0010] By adopting the above technical solution, since both silicon steel sheets and low carbon steel are steel materials with the same melting point, the stator core and inserts in this application embodiment are more easily connected together by welding, and the strength of the weld between the two (e.g., tensile strength) can be guaranteed.

[0011] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein the fixing plate further includes a plurality of fixing holes, and a plurality of inserts are correspondingly disposed in the plurality of fixing holes and connected to the corresponding fixing holes; wherein each fixing hole penetrates the fixing plate along the axial direction.

[0012] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, each of the inserts having a slot extending along the axial direction; along the axial direction, one end of the slot communicates with the corresponding fixing hole, and the other end forms a welding portion, the welding portion being welded to the back side of the stator core to form the fusion region.

[0013] According to another specific embodiment of the present invention, an electric motor is disclosed, wherein the welded part is welded to the back side of the stator core by laser penetration welding.

[0014] By adopting the above technical solution, the energy of the laser welding beam is mainly concentrated in the laser irradiation area, and will not affect the periphery of the welded part (such as the side wall of the slot). It can form an effective weld without reducing the performance of the stator core itself (such as the integrity of the stator core and the saturation of the magnetic field).

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein the height of the welding area includes 0.5 mm to 1 mm.

[0016] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein each of the fixing holes has a recess in its hole wall, the recess extending circumferentially along the hole wall; each of the inserts has a protrusion corresponding to the recess, the protrusion extending circumferentially along the insert and being accommodated within the recess, and one end of each of the inserts abutting against the upper wall of the recess along the axial direction.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein each of the inserts is die-cast with the fixing plate.

[0018] By adopting the above technical solution, since the insert and the fixing hole of the embodiment of this application are die-cast and sealed, the stator core forms a fusion area by welding with the insert, and is not connected to the internal space of the motor, no additional sealing treatment is required, thus eliminating the risk of leakage.

[0019] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein the back side of the stator core includes a plane.

[0020] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor in which each of the welded portions has the same diameter and the same thickness along the axial direction.

[0021] By adopting the above technical solution, since the diameter and thickness of each welded part in the embodiment of this application are the same, and the depth and range of the welded area formed after each welded part is welded to the back of the stator core are also the same, the back of the stator core can be evenly and tightly attached to the bottom surface of the fixing plate through each welded area. Attached Figure Description

[0022] Figure 1 A perspective view of the stator core and mounting plate of an electric motor using a screw fastening method is shown.

[0023] Figure 2A A front view of the mounting plate of the motor, which is fastened with screws, is shown.

[0024] Figure 2B A schematic diagram of the stator core of an electric motor using a screw fastening method is shown;

[0025] Figure 2C A cross-sectional view of the stator core and fixing plate fastened with screws is shown.

[0026] Figure 3 A perspective view of the stator core and fixing plate of the motor according to an embodiment of the present invention is shown;

[0027] Figure 4A A cross-sectional view of the stator core and fixing plate of the motor according to an embodiment of the present invention is shown. Figure 1 ;

[0028] Figure 4B A cross-sectional view of the mounting plate of the motor according to an embodiment of the present invention is shown;

[0029] Figure 4C A perspective view of the stator core and insert of the motor according to an embodiment of the present invention is shown;

[0030] Figure 4D A second cross-sectional view of the stator core and fixing plate of the motor according to an embodiment of the present invention is shown. Detailed Implementation

[0031] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0032] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0034] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0037] For the stator core of a motor (such as a new energy axial permanent magnet motor), since the stator core needs to be fixed to the housing (such as an end cover or a fixing plate), the stator core is usually connected to the housing (such as an end cover or a fixing plate) by screw fastening.

[0038] The implementation method of the above-described screw fastening method will now be described in further detail with reference to the accompanying drawings.

[0039] Figure 1 A perspective view of the stator core and mounting plate of an electric motor using a screw-fastening method is shown. Figure 2A The front view shows a mounting plate for a motor that is fastened with screws. Figure 2B A schematic diagram of the stator core of an electric motor using a screw fastening method is shown.

[0040] refer to Figure 1 Along the axial direction of motor 100 (e.g.) Figure 1 (As shown in the Z-direction), the stator core 101 is located below the fixing plate 102. That is, the fixing plate 102 is located on the back side of the stator core 101. (See reference) Figure 2A and Figure 2B The fixing plate 102 has a cooling channel 1021 and multiple bolt holes 1022. The stator core 101 has multiple threaded holes 1011 corresponding to the bolt holes 1022. The fixing plate 102 is threadedly connected to the stator core 101 by fastening screws 1023.

[0041] Specifically, such as Figure 2A As shown, ten bolt holes 1022 are distributed on the fixing plate 102, and cooling channels 1021 are spaced apart from each bolt hole 1022, as shown. Figure 2B As shown, ten threaded holes 1011 are formed on the back side 10101 of the stator core 101. (As indicated...) Figure 2C As shown, along the axial direction (e.g.) Figure 2C(As shown in the Z direction), each of the ten fastening screws 1023 passes through the bolt hole 1022 of the fixing plate 102 and extends into the threaded hole 1011 of the stator core 101, so that the fixing plate 102 and the stator core 101 are fixedly connected by threaded connection with the corresponding bolt hole 1022 and threaded hole 1011.

[0042] Those skilled in the art will understand that, since the stator core 101 is formed by tightly stacking multiple layers of silicon steel sheets, the threaded connection strength between the fastening screws 1023 and the threaded holes 1011 in the stator core 101 formed by the overlapping materials is insufficient, resulting in a high risk of failure in the screw fastening between the fixing plate 102 and the stator core 101. This necessitates the use of a large number of fastening bolts 33 to connect the fixing plate 102 and the stator core 101, which is cumbersome and labor-intensive, increasing the manufacturing difficulty.

[0043] Furthermore, the aforementioned fixing plate 102 and stator core 101, which are fastened with screws, are respectively provided with ten bolt holes 1022 and ten threaded holes 1011. On the one hand, because the fixing plate 102 has a large number of bolt holes 1022, and the threaded holes 1011 on the stator core 101 are fixed in position, the cooling channel 1021 of the fixing plate 102 needs to be designed to avoid the positions of the bolt holes 1022. This not only increases the design cost, but also makes the cooling circuit structure complex and reduces the cooling efficiency. Moreover, each bolt hole 1022 has the risk of leakage, resulting in low motor stability. On the other hand, the large number of threaded holes 1011 on the stator core 101 will damage the structural integrity of the stator core 101. The threaded holes 1011 reduce a part of the magnetic flux circuit of the stator core 101, reducing the magnetic field saturation of the stator core 101, thereby impairing the efficiency of the motor 100 and reducing the motor efficiency.

[0044] To achieve a non-destructive connection between the stator core and the fixed plate of the motor, this application provides a motor comprising a stator core and a fixed plate, wherein the stator core and the fixed plate are connected by welding and assembled and fixed without screws, which has a simple structure and high assembly efficiency.

[0045] Figure 3 This is a perspective view of the stator core and fixing plate of the motor provided in an embodiment of this application.

[0046] refer to Figure 3 The motor 1 in this embodiment includes a stator core 10 and a fixing plate 20.

[0047] Specifically, such as Figure 3 As shown, along the axial direction of motor 1 (e.g.) Figure 3As shown in the Z direction, the stator core 10 is located below the fixing plate 20, and the back side of the stator core 10 (not shown in the figure) is in contact with the fixing plate 20. That is, the fixing plate 20 is located on the back side of the stator core 10.

[0048] It is understood that the structure illustrated in the embodiments of this application does not constitute a specific limitation on the motor 1. In other embodiments of this application, the motor 1 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. For example, the motor 1 may also include components such as a rotor, windings, housing, and cooling structure 21.

[0049] Continue to refer to Figure 3 and combined Figure 4A In this embodiment of the application, the stator core 10 and the fixing plate 20 are connected by an insert 22. The fixing plate 20 includes a cooling channel 21 and a plurality of inserts 22.

[0050] For example, such as Figure 3 As shown, the cooling channel 21 is circumferentially aligned with the motor 1 (e.g., Figure 3 Extending in the direction of R, the fixing plate 20 also has ten fixing holes 23, and ten inserts (not shown in the figure) are correspondingly set in the ten fixing holes 23. Each of the ten inserts 22 is arranged radially and spaced apart from the cooling channel 21 to avoid the cooling circuit design of the motor 1.

[0051] The embodiments of this application do not limit the number and position distribution of the inserts 22 and the corresponding fixing holes 23, as long as the connection strength requirements between the stator core 10 and the fixing plate 20 are met. For example, there can be three, four, five, six, eight, eleven or more. For ease of explanation, the following description uses one insert 22 and one corresponding fixing hole 23 out of ten inserts 22 and ten fixing holes 23 as an example.

[0052] Specifically, such as Figure 4A As shown, the fixing plate 20 is attached to the back surface 11 of the stator core 10. An insert 22 is disposed on the side 201 of the fixing plate 20 near the back surface 11 of the stator core 10. The insert 22 faces the back surface 11 of the stator core 10 and is welded to the back surface 11 of the stator core 10 to form a welded area 221 (e.g., ...). Figure 4A (As shown within the black frame in the middle). Thus, in this embodiment of the application, the stator core 10 is welded to ten inserts 22 respectively, thereby connecting the stator core 10 and the fixing plate 20 by welding.

[0053] For example, in this embodiment of the application, the stator core 10 and the fixing plate 20 are welded together by laser penetration welding. However, this embodiment of the application does not limit the welding type between the stator core 10 and the fixing plate 20. For example, other welding types such as seam welding can also be used, as long as the stator core 10 can be welded to the fixing plate 20. For ease of explanation, the following description uses laser penetration welding as an example.

[0054] In this embodiment, the stator core 10 is connected to the fixing plate 20 by welding. Since the stator core 10 is welded to the insert 22 provided on the fixing plate 20, no bolt holes are opened on the stator core 10, the back side 11 of the stator core 10 is clean and tidy, avoiding machining of the stator core 10, and also increasing the overall strength of the stator core 10.

[0055] Therefore, in this embodiment, the stator core 10 is welded to the fixing plate 20 without screws. Compared with existing screw-fastening methods, the stator core 10 in this embodiment can fit tightly against the fixing plate 20, resulting in a low failure risk and high connection strength in the welded connection between the fixing plate 20 and the stator core 10. Furthermore, the back surface 11 of the stator core 10 is flat and does not require threaded holes, ensuring the integrity of the magnetic field of the stator core 10 and resulting in a more saturated magnetic circuit, thus improving the efficiency of the motor 1 in this embodiment.

[0056] On the other hand, the position of the insert 22 provided on the fixing plate 20 of this application embodiment relative to the stator core 10 is flexible, and the position of the welding point formed by the stator core 10 and the insert 22 is more free and not restricted by the bolt holes in the stator core 10. It can avoid the cooling channel 21 provided on the fixing plate 20, which facilitates the layout of the cooling structure in the fixing plate 20 of the motor 1 of this application embodiment and has a good cooling effect.

[0057] The following section will describe in detail the connection between the stator core and the fixing plate by welding with insert 22, with reference to the accompanying drawings.

[0058] refer to Figure 4B and combined Figure 3 and Figure 4A In this embodiment, the insert 22 is correspondingly disposed within the fixing hole 23 and connected to the corresponding fixing hole 23. Exemplarily, the fixing hole 23 is axially (e.g., ...). Figure 4B(As shown in the Z-direction) A circular annular hole (23) penetrates the fixing plate 20, defining a circular annular space 231 within the fixing hole 23, allowing the insert 22 to be accommodated within this annular space 231. However, the specific structure of the fixing hole 23 is not limited in this embodiment. For example, the fixing hole 23 can also be an annular hole with a square or elliptical cross-section, or other shapes. In this case, a square or elliptical annular space is defined within the fixing hole 23, as long as the insert 22 in this embodiment is accommodated within this annular space.

[0059] Specifically, such as Figure 4B As shown, the insert 22 extends along the axial direction Z and has a slot 222 extending along the axial direction Z. Along the axial direction Z, one end 2221 of the slot 222 communicates with the annular space 231 in the fixing hole 23, and the other end 2222 of the slot 222 forms a weld portion 223. In other words, the sidewall 2223 of the slot 222 of the insert 22 extends upward along the axial direction Z to form an opening 2224 on the side of the insert 22 away from the stator core 10, and the opening 2224 communicates with the annular space 231 in the fixing hole 23; the sidewall 2223 of the slot 222 of the insert 22 extends downward along the axial direction Z to form a weld portion 223 on the side of the insert 22 near the stator core 10. For example, as Figure 4A and Figure 4B As shown, the insert 22 is a cup-shaped structure with a closed bottom and an open top, so that the laser welding beam passes through the opening 2224 of the insert 22 and irradiates the back of the welding part 223. The welding part 223 is welded to the back 11 of the stator core 10 to form a fusion area 221.

[0060] For example, such as Figures 4A to 4C As shown, the back surface 11 of the stator core 10 in this embodiment includes a flat surface 111, meaning the back surface 11 of the stator core 10 has good flatness so that the back surface 11 of the stator core 10 can fit tightly against the bottom surface of the fixing plate 20. Furthermore, in this embodiment, the diameter of each welded portion 223 (e.g., Figure 4B The thickness of each welded part 223 is the same as shown in D, and the thickness of each welded part 223 is (as shown in D). Figure 4B The height H is the same as that shown, so that after each welded part 223 is welded to the back side 11 of the stator core 10, the back side 11 of the stator core 10 can be kept close to the bottom surface of the fixing plate 20.

[0061] like Figure 4B and Figure 4D As shown, in this embodiment of the application, the insert 22 is welded to the back surface 11 of the stator core 10 by laser penetration welding. The laser welding beam (e.g., Figure 4D(As shown by the straight line with arrows) The light is injected from above the fixing plate 20 into the fixing hole 23 along the axial direction Z, passes through the opening 2224 of the insert 22 and enters the slot 222, irradiates the welding part 223 of the insert 22, and forms a light spot on the welding part 223, thereby forming the above-mentioned fusion region 221 between the stator core 10 and the welding part 223, and causing part of the stator core 10 and part of the welding part 223 in the fusion region 221 to melt and form a whole.

[0062] For example, the stator core 10 of this application includes silicon steel sheets, and the insert 22 is made of low-carbon steel. Since both silicon steel sheets and low-carbon steel are steels with the same melting point, the stator core 10 and the insert 22 are more easily connected by welding, ensuring the strength of the weld (e.g., tensile strength). However, this application is not limited to this; the material of the insert 22 is not specifically limited, as long as it can meet the tensile strength requirements within the welded area 221 formed by the welded portion 223 and the stator core 10. For example, the insert 22 in this application embodiment can also be made of other steels with a melting point similar to that of silicon steel sheets.

[0063] By way of example, the weld depth (i.e., the height of the weld region 221) in the embodiment of this application is as follows: Figure 4A The value (as shown in H1) can be any value in the range of 0.5mm to 1mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0064] It is understood that the energy of the laser welding beam is mainly concentrated in the spot (i.e., the laser irradiation area) and will not affect the periphery of the welded part 223 (e.g., the side wall of the slot 222). This allows for the formation of an effective weld without reducing the performance of the stator core 10 itself (e.g., the integrity of the magnetic circuit and the saturation of the magnetic field of the stator core 10).

[0065] Continue to refer to Figure 4D In this embodiment, the fixing hole 23 has a recess 233 on its wall 232, which extends circumferentially around the wall 232. Along the axial direction Z, the insert 22 has a protrusion 224 corresponding to the recess 233, which is received within the recess 233, allowing the insert 22 to be connected to the fixing hole 23. In other words, the outer wall of the insert 22 has a protrusion 224 that extends circumferentially around the insert 22 and is received within the recess 233 in the wall 232 of the fixing hole 23, so that the inner wall of the recess 233 fits against the outer wall of the protrusion 224, and the upper wall of the recess 233 abuts against one end of the protrusion 224 (i.e., one end 2201 of the insert 22) along the axial direction Z.

[0066] like Figure 4DAs shown, the wall 232 of the fixing hole 23 is also provided with a limiting portion 234. Exemplarily, the limiting portion 234 extends circumferentially along the wall 232 of the fixing hole 23 and protrudes from the inner side of the wall 232. The insert 22 is accommodated in the annular space 231 within the fixing hole 23. Along the axial direction Z, the limiting portion 234 of the fixing hole 23 abuts against one end 2201 of the insert 22 to restrict the movement of the insert 22 in the fixing hole 23 along the axial direction Z, thereby avoiding affecting the connection stability between the fixing hole 23 and the insert 22, and thus affecting the connection strength between the stator core 10 and the fixing plate 20 in this embodiment of the application.

[0067] This application embodiment does not specifically limit the connection method between the insert 22 and the fixing hole 23. In the above embodiments, each insert 22 in this application embodiment is die-cast with the fixing plate 20, that is, each insert 22 is formed together with the corresponding fixing hole 23 through a die-casting process. Exemplarily, the molten insert 22 material (e.g., low carbon steel) in this application embodiment is pressed into the mold cavity (e.g., recess 233) formed by the hole wall 232 of the fixing hole 23 under high pressure, and then cooled to form a solid insert 22, and the insert 22 is die-cast together with the fixing hole 23. Thus, since the insert 22 and the fixing hole 23 in this application embodiment are die-cast, the insert 22 and the fixing hole 23 are sealed together, that is, the fixing hole 23 is not connected to the internal space of the motor 1, and no additional sealing treatment is required. However, it is not limited to this. For example, the insert 22 in this application embodiment can also be connected to the corresponding fixing hole 23 by snap-fit ​​or interference fit.

[0068] For example, the fixing plate 20 in this application embodiment also includes a sealing plug (not shown in the figure). The sealing plug is disposed in the fixing hole 23 and is located on the side of the insert 22 away from the stator core 10 along the axial direction Z, so that the fixing hole 23 of the fixing plate 20 is sealed to the insert 22, ensuring the sealing between the stator core 10 and the fixing plate 20 and eliminating the risk of leakage.

[0069] In summary, the embodiments of this application provide an electric motor in which the stator core and the fixing plate are connected by welding and assembled and fixed without screws, which has a simple structure and high assembly efficiency.

[0070] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. An electric motor, characterized in that, include: Stator core; A fixing plate is provided on the back side of the stator core along the axial direction and is in contact with the back side of the stator core. The fixing plate includes cooling channels and multiple inserts, the multiple inserts being disposed on the side of the fixing plate near the back of the stator core; wherein, Each of the inserts is radially spaced from the cooling channel and welded to the back of the stator core to form a weld zone.

2. The motor according to claim 1, characterized in that, The stator core comprises silicon steel sheets, and the insert is made of low-carbon steel.

3. The motor according to claim 1 or 2, characterized in that, The fixing plate further includes multiple fixing holes, and the multiple inserts are correspondingly disposed in the multiple fixing holes and connected to the corresponding fixing holes; wherein... Each of the fixing holes extends through the fixing plate along the axial direction.

4. The motor according to claim 3, characterized in that, Each of the inserts has a slot extending along the axial direction; Along the axial direction, one end of the slot communicates with the corresponding fixing hole, and the other end forms a welding part, which is welded to the back of the stator core to form the fusion area.

5. The motor according to claim 4, characterized in that, The welded part is welded to the back of the stator core by laser penetration welding.

6. The motor according to any one of claims 1, 2, 4, and 5, characterized in that, Along the axial direction, the weld depth of the welded area ranges from 0.5 mm to 1 mm.

7. The motor according to claim 3, characterized in that, Each of the fixing holes has a recess in its hole wall, and the recess extends circumferentially along the hole wall; Each of the inserts has a protrusion corresponding to the recess, the protrusion extending circumferentially along the insert and being received within the recess, and one end of each insert abutting against the upper wall of the recess along the axial direction.

8. The motor according to any one of claims 1, 2, 4, 5, and 7, characterized in that, Each of the inserts is die-cast with the fixing plate.

9. The motor according to any one of claims 1, 2, 4, 5, and 7, characterized in that, The back side of the stator core includes a flat surface.

10. The motor according to any one of claims 4, 5, and 7, characterized in that, Each of the welded parts has the same diameter and the same thickness.

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