Stator assembly, electric motor and power apparatus

Abstract

A stator assembly, an electric motor and a power apparatus. The stator assembly comprises: a stator yoke part (11), wherein an accommodating cavity is formed in the stator yoke part (11), and a first connecting part (111) is formed on an inner wall of the accommodating cavity; and a stator tooth part (12), wherein a second connecting part (121) is formed on the periphery of the stator tooth part (12), the second connecting part (121) is adapted to cooperate with the first connecting part (111) so as to connect the stator tooth part (12) to the stator yoke part (11) and to accommodate the stator tooth part (12) and the stator yoke part (11) in the accommodating cavity, and the material of the stator tooth part (12) is constructed as oriented silicon steel.

Description

Stator assemblies, motors and power equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202310816920.X filed on July 5, 2023, entitled “Stator Assembly, Motor and Power Equipment,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present invention relates to the field of motors, and in particular to a stator assembly, a motor and a power device. Background Art

[0004] The motor is the core of new energy vehicles. With the continuous advancement of technology, the performance requirements for motors in the new energy vehicle sector are becoming increasingly stringent. Analysis of long-term operating conditions of new energy vehicle motors shows that approximately 75% of motor losses are composed of iron loss and mechanical loss. Therefore, reducing motor iron loss can quickly and effectively improve motor operating efficiency. Existing compressor permanent magnet synchronous motors generally use non-oriented electrical steel as the core material. This steel has a limited saturation flux density, which limits the motor's performance under certain operating conditions. For example, under high-speed or high-torque operating conditions, the motor's stator core, especially the stator teeth, is limited by the motor's size. Given a certain tooth width, an increase in flux density can lead to magnetic saturation of the stator core. Once the flux density saturates at a certain point, it inevitably causes significant iron losses in the motor, reducing its efficiency.

[0005] Patent publication number CN207782503U, titled "An Oriented Silicon Steel Stator Core," proposes constructing the stator core as a U-shaped core composed of multiple oriented silicon steel laminations to fully utilize the high magnetic permeability and low iron loss characteristics of oriented electrical steel in the rolling direction. This results in a motor with a short magnetic circuit, low magnetic leakage, low losses, low noise, high material utilization, and high torque density. It also reduces copper wire usage and lowers motor temperature rise. However, the U-shaped core described in this patent is not suitable for the flat wire winding motors currently in the market. Furthermore, the stator teeth and yoke are both made of oriented silicon steel, which fails to meet the yoke's requirements for the rotating motor's magnetic circuit and instead increases motor losses.

[0006] In related technologies, the stator core of a motor is made of non-oriented silicon steel. This results in high iron losses and reduced motor efficiency under high-speed or high-torque conditions. However, the stator core of a motor made of oriented silicon steel suffers from poor uniformity due to the poor non-rolling properties of oriented silicon steel and the rotational characteristics of the motor. This also fails to meet the stator yoke's requirements for the rotating motor's magnetic circuit, increasing motor losses and affecting motor efficiency. Furthermore, the U-shaped stator core is unsuitable for the flat-wire winding motors currently prevalent in the motor market, resulting in a limited scope of application and poor versatility.

[0007] Summary of the Invention

[0008] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0009] Therefore, an object of the present invention is to provide a stator assembly that reduces motor losses, improves motor efficiency, and optimizes motor performance.

[0010] Another object of the present invention is to provide a motor having the above-mentioned stator assembly.

[0011] Another object of the present invention is to provide a power device having the above motor.

[0012] According to an embodiment of the present invention, a stator assembly for a motor includes: a stator yoke, wherein a housing cavity is formed in the stator yoke, and a first connecting portion is formed on the inner wall of the housing cavity; a stator tooth, wherein a second connecting portion is formed on the outer periphery of the stator tooth, and the second connecting portion is suitable for cooperating with the first connecting portion to connect the stator tooth and the stator yoke and accommodate them in the housing cavity; wherein the material structure of the stator tooth is oriented silicon steel.

[0013] The stator assembly of the present invention comprises a stator yoke and stator teeth, with a first connecting portion formed on the inner wall of the stator yoke's housing cavity and a second connecting portion formed on the outer periphery of the stator teeth. The second connecting portion cooperates with the first connecting portion to connect the stator teeth to the stator yoke, and the stator teeth and components mounted thereon are accommodated together within the stator yoke's housing cavity, thereby achieving assembly of the stator assembly. The stator teeth are constructed of grain-oriented silicon steel to improve the stator assembly's magnetic permeability, reduce motor iron loss, and lower the motor's temperature rise during high-speed operation. This improves the motor's operating efficiency, reduces its size and cost, and contributes to an increase in vehicle range. In the related art, the stator core is made of non-oriented silicon steel as raw material, which leads to large iron loss under high speed or high torque operating conditions, resulting in reduced motor efficiency. The stator core is made of oriented silicon steel as raw material, which leads to poor uniformity of the motor stator and cannot meet the requirements of the yoke for the magnetic circuit of the rotating motor, thereby increasing motor loss and affecting motor efficiency. In the present invention, the stator yoke and the stator teeth are constructed as two independent components, so that the stator yoke and the stator teeth can be manufactured with different materials and processes according to their respective working requirements, thereby achieving the purpose of precise use of materials and optimizing the performance of the stator assembly, thereby achieving improved material utilization and saving economic costs while improving motor efficiency. In addition, since the stator yoke and the stator teeth are connected through the first connecting portion and the second connecting portion, some components in the stator assembly that need to be installed on the stator teeth can be separately installed and fixed on the stator teeth before the stator teeth and the stator yoke are assembled, thereby avoiding the stator yoke from restricting the installation direction and space of the components on the stator teeth, increasing the assembly direction and space of the components on the stator teeth, effectively improving the installation convenience of the components on the stator teeth, and helping to protect the components on the stator teeth from being scratched, thereby helping to improve the safety of the stator assembly and extend its service life.

[0014] In addition, the stator assembly according to the above embodiment of the present invention may also have the following additional technical features:

[0015] According to an example of the present invention, one of the first connecting part and the second connecting part is constructed as a protrusion extending in the radial direction, and the other of the first connecting part and the second connecting part is constructed as a groove that snaps into engagement with the protrusion, and at least a portion of the outer surface of the protrusion and at least a portion of the inner surface of the groove abut against each other in the radial direction.

[0016] According to an example of the present invention, the first connection portion and / or the second connection portion move in a direction approaching each other in the axial direction to connect the stator tooth portion with the stator yoke portion.

[0017] According to an example of the present invention, the first connecting portion is configured as the groove, and the width of the cross section of the groove in the axial direction gradually decreases in a radial direction toward the center of the stator yoke.

[0018] According to one example of the present invention, the groove is configured as a trapezoidal groove recessed radially away from the stator tooth portion, the maximum width of the trapezoidal groove is greater than the slot width of the trapezoidal groove, and the second connecting portion is configured as a trapezoidal protrusion having the same or similar cross-section as the trapezoidal groove.

[0019] According to an example of the present invention, at least a portion of the cross section of the groove in the axial direction extends in the circumferential direction.

[0020] According to an example of the present invention, the stator teeth are constructed to be stacked axially and spaced apart circumferentially, and a winding slot is defined between two adjacent stator teeth in the circumferential direction; the stator assembly further includes: a winding, which is wound in the winding slot.

[0021] According to an example of the present invention, a limiting portion protruding along the circumferential direction is formed at the radial inner end of the stator tooth portion, and the limiting portion is suitable for abutting against the winding.

[0022] According to an example of the present invention, a transition section is formed between the second connecting portion and the stator tooth portion, and a width of the transition section is smaller than that of the second connecting portion and the stator tooth portion, respectively.

[0023] According to an example of the present invention, the width of each stator tooth portion gradually increases in a direction approaching the stator yoke portion.

[0024] The motor according to the embodiment of the present invention is provided with the stator assembly described in any one of the above embodiments. Since the motor according to the present invention is provided with the stator assembly described in any one of the above embodiments, the stator yoke and the stator teeth in the motor are respectively constructed as independent components. The stator teeth can be manufactured using oriented silicon steel as raw material to reduce the iron loss of the motor and improve the operating efficiency of the motor. A first connecting portion and a second connecting portion are respectively formed on the stator yoke and the stator teeth, so that the winding can be wound around the winding slot along the outer periphery of the stator teeth toward the center of the stator teeth, and then assembled with the stator yoke along the axial direction together with the stator teeth, thereby protecting the outer surface of the winding from being scratched, thereby ensuring the working reliability of the stator assembly and improving the working performance and safety of the motor.

[0025] The power equipment according to an embodiment of the present invention is provided with the motor in the above embodiment. Since the power equipment according to the present invention is provided with the motor described in the above embodiment, the motor in the power equipment reduces iron loss and copper loss through the stator assembly, effectively improves the working efficiency of the motor, and is conducive to reducing the temperature rise of the motor under high-speed operation conditions, improving the working reliability of the motor, thereby optimizing the working performance of the power equipment and providing a better user experience.

[0026] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is an axial cross-sectional view of a stator assembly according to one embodiment of the present invention;

[0028] FIG2 is a schematic diagram of partial coordination between a stator yoke, a stator tooth, and a winding according to an embodiment of the present invention;

[0029] FIG3 is a partial structural diagram of a stator yoke, stator teeth, and windings according to an embodiment of the present invention.

[0030] Reference numerals: stator assembly 1 ; stator yoke 11 , first connecting portion 111 ; stator teeth 12 , second connecting portion 121 , transition section 122 , limiting portion 123 ; winding 13 . DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0032] A stator assembly 1 according to an embodiment of the present invention will be described below with reference to FIG. 1 to FIG. 3 .

[0033] The stator assembly 1 for a motor according to the present invention includes a stator yoke 11 and stator teeth 12. The stator teeth 12 and stator yoke 11, as part of the motor's magnetic circuit, conduct magnetic flux to achieve energy conversion within the motor. A housing cavity is formed within the stator yoke 11, with a first connecting portion 111 formed on the inner wall of the housing cavity. The stator teeth 12 provide mounting locations for some other components in the stator assembly 1. A second connecting portion 121 is formed on the outer periphery of the stator teeth 12. The second connecting portion 121 is adapted to cooperate with the first connecting portion 111 to connect the stator teeth 12 to the stator yoke 11 and accommodate them within the housing cavity, thereby forming the stator teeth 12 and the stator yoke 11 into a single unit. The stator teeth 12 are made of grain-oriented silicon steel. Grain-oriented silicon steel has advantages such as low iron loss, high magnetic induction intensity, and low magnetostriction. This allows the stator assembly 1 to have good electromagnetic properties, reduce iron loss in the motor, and improve motor performance.

[0034] The stator assembly 1 of the present invention is provided with a stator yoke 11 and a stator tooth 12. A first connecting portion 111 is formed on the inner wall of the accommodating cavity of the stator yoke 11, and a second connecting portion 121 is formed on the outer periphery of the stator tooth 12. The second connecting portion 121 can cooperate with the first connecting portion 111 to connect the stator tooth 12 to the stator yoke 11, and the stator tooth 12 and the components mounted on the stator tooth 12 can be accommodated together in the accommodating cavity of the stator yoke 11, thereby achieving the assembly of the stator assembly 1. Among them, the material structure of the stator tooth 12 is oriented silicon steel to improve the magnetic permeability of the stator assembly 1, reduce the iron loss of the motor, and reduce the temperature rise of the motor when running at high speed, thereby improving the operating efficiency of the motor, reducing the size and cost of the motor, and helping to improve the cruising range of the vehicle. In the related art, the stator core is made of non-oriented silicon steel as raw material, which leads to large iron loss under high speed or high torque operating conditions, resulting in reduced motor efficiency. The stator core is made of oriented silicon steel as raw material, which leads to poor uniformity of the motor stator and cannot meet the requirements of the yoke for the magnetic circuit of the rotating motor, thereby increasing motor loss and affecting motor efficiency. In the present invention, the stator yoke 11 and the stator tooth 12 are constructed as two independent components, so that the stator yoke 11 and the stator tooth 12 can be manufactured with different materials and processes according to their respective working requirements, thereby achieving the purpose of precise use of materials and optimizing the performance of the stator assembly 1, thereby achieving improved material utilization while improving motor efficiency and saving economic costs. In addition, since the stator yoke 11 and the stator tooth portion 12 are connected by the first connecting portion 111 and the second connecting portion 121, some components in the stator assembly 1 that need to be installed on the stator tooth portion 12 can be separately installed and fixed on the stator tooth portion 12 before the stator tooth portion 12 and the stator yoke 11 are assembled, thereby avoiding the stator yoke 11 from restricting the installation direction and space of the components on the stator tooth portion 12, increasing the assembly direction and space of the components on the stator tooth portion 12, effectively improving the installation convenience of the components on the stator tooth portion 12, and helping to protect the components on the stator tooth portion 12 from being scratched, thereby helping to improve the safety of the stator assembly 1 and extend its service life.

[0035] Furthermore, in a specific embodiment of the present invention, the stator yoke 11 is constructed of non-oriented silicon steel. Since the magnetic permeability of non-oriented silicon steel is substantially uniform in all directions and can reduce coercive force, core loss, and magnetic aging, constructing the stator yoke 11 of non-oriented silicon steel ensures a balanced magnetic flux density, thereby ensuring good operating performance.

[0036] In another specific embodiment of the present invention, the stator yoke 11 is formed by winding, so as to improve the manufacturing convenience of the stator yoke 11 while reducing the generation of waste, thereby further reducing the amount of motor materials, improving material utilization, and saving economic costs.

[0037] According to one embodiment of the present invention, the first connection portion 111 and the second connection portion 121 are configured to engage with each other in a snap-fit ​​manner. In the stator assembly 1 of this embodiment, the first connection portion 111 can be configured as a radially extending protrusion, and the second connection portion 121 can be configured as a groove that snap-fits with the protrusion. Alternatively, the second connection portion 121 can be configured as a radially extending protrusion, and the first connection portion 111 can be configured as a groove that snap-fits with the protrusion. At least a portion of the outer surface of the protrusion abuts against at least a portion of the inner surface of the groove in the radial direction. By constructing one of the first connecting portion 111 and the second connecting portion 121 as a protrusion extending in the radial direction and the other as a groove that is engaged with the protrusion, the stator yoke 11 and the stator tooth 12 can be quickly and easily assembled by engaging, thereby improving the assembly efficiency of the stator assembly 1. When the protrusion is engaged with the corresponding groove, the stator tooth 12 is accommodated in the accommodating cavity of the stator yoke 11. At this time, at least part of the outer surface of the protrusion and at least part of the inner surface of the groove are radially stopped, so that the protrusion and the groove can limit the radial movement between the stator yoke 11 and the stator tooth 12, thereby improving the accuracy of the position of the stator tooth 12 in the accommodating cavity, and improving the control accuracy of the stator assembly 1 over the assembly position of the stator tooth 12 and the stator yoke 11.

[0038] According to one embodiment of the present invention, the first connection portion 111 and / or the second connection portion 121 move in the axial direction toward each other to connect the stator tooth portion 12 with the stator yoke portion 11. It is understandable that the movement direction of the first connection portion 111 and / or the second connection portion 121 is the assembly direction of the stator tooth portion 12 and the stator yoke portion 11. Therefore, by setting the first connection portion 111 and / or the second connection portion 121 to move in the axial direction toward each other, the stator tooth portion 12 and the stator yoke portion 11 only need to move relative to each other in the axial direction to complete the connection, thereby achieving simple and convenient assembly between the stator tooth portion 12 and the stator yoke portion 11, thereby improving the assembly efficiency and maintenance convenience of the stator assembly 1.

[0039] In addition, in a specific embodiment of the present invention, the connection process of the stator yoke 11 and the stator tooth portion 12 can be that the stator tooth portion 12 is first fixed by an assembly tool, and the second connection portion 121 on the stator tooth portion 12 is fixed accordingly, and then the stator yoke 11 is moved axially toward the direction close to the stator tooth portion 12, so that the first connection portion 111 on the stator yoke 11 is correspondingly moved axially toward the direction close to the second connection portion 121. During this process, the stator tooth portion 12 gradually enters the accommodating cavity. When the first connection portion 111 is finally engaged with the second connection portion 121, the assembly of the stator yoke 11 and the stator tooth portion 12 is completed. In this embodiment, the connection process of the stator yoke 11 and the stator tooth portion 12 can also be that the stator yoke 11 is first fixed by an assembly tool, and the second connection portion 121 on the stator tooth portion 12 is fixed accordingly. The first connection part 111 on the yoke part 11 is fixed accordingly, and then the stator tooth part 12 is moved axially toward the direction close to the stator yoke part 11, so that the second connection part 121 on the stator tooth part 12 is moved axially toward the direction close to the first connection part 111 accordingly. Similarly, in this process, the stator tooth part 12 gradually enters the accommodating cavity. When the first connection part 111 is finally engaged with the second connection part 121, the assembly of the stator yoke part 11 and the stator tooth part 12 is completed; in this embodiment, the connection process of the stator yoke part 11 and the stator tooth part 12 can also be to move the stator yoke part 11 and the stator tooth part 12 axially toward each other until the first connection part 111 and the second connection part 121 are engaged, thereby completing the assembly of the stator yoke part 11 and the stator tooth part 12.

[0040] According to one embodiment of the present invention, the first connection portion 111 is configured as a groove, and the width of the cross section of the groove in the axial direction gradually decreases in the direction radially toward the center of the stator yoke 11. Correspondingly, the second connection portion 121 is configured as a protrusion, and the width of the cross section of the protrusion in the axial direction gradually decreases in the direction radially toward the center of the stator tooth portion 12. By configuring the first connection portion 111 as a groove, and the width of the cross section of the groove in the axial direction gradually decreases in the direction radially toward the center of the stator yoke 11, when the first connection portion 111 and the second connection portion 121 are snap-fitted, the protrusion is accommodated in the corresponding groove. At this time, the groove can limit the protrusion to prevent the protrusion from radially escaping from the groove, thereby increasing the connection strength and stability between the protrusion and the groove, improving the stability of the connection between the stator tooth portion 12 and the stator yoke 11, and thus ensuring the working reliability and safety of the stator assembly 1.

[0041] According to one embodiment of the present invention, the groove is constructed as a trapezoidal groove that is recessed radially away from the stator tooth portion 12, and the maximum width of the trapezoidal groove is greater than the slot opening width of the trapezoidal groove, wherein the slot opening of the trapezoidal groove is open radially toward the stator tooth portion 12, and the second connecting portion 121 is constructed as a trapezoidal protrusion with the same or similar cross-section as the trapezoidal groove, and the maximum width of the trapezoidal protrusion is greater than the width of the slot opening. By constructing the first connecting portion 111 and the second connecting portion 121 as a trapezoidal groove and a trapezoidal protrusion respectively, on the one hand, the side wall of the trapezoidal groove can guide and position the trapezoidal protrusion, so that when the trapezoidal protrusion cooperates with the trapezoidal groove along the axial direction, the stator tooth portion 12 can easily and accurately enter the accommodating cavity and be connected to the stator yoke portion 11, thereby further improving the assembly convenience of the stator assembly 1; on the other hand, by constructing the first connecting portion 111 and the second connecting portion 121 as a trapezoidal groove and a trapezoidal protrusion respectively, and setting the maximum width of the trapezoidal groove to be greater than the slot width of the trapezoidal groove, when the trapezoidal protrusion enters the trapezoidal groove along the axial direction, the slot width of the trapezoidal groove is smaller than the maximum width of the trapezoidal protrusion in the slot, so that the trapezoidal protrusion in the slot cannot radially escape from the slot, thereby ensuring the connection reliability between the stator tooth portion 12 and the stator yoke portion 11. In addition, since the side walls of the trapezoidal groove are inclined, the side walls of the trapezoidal groove can also provide good support for the trapezoidal protrusion, thereby further improving the stability of the connection between the stator tooth portion 12 and the stator yoke portion 11.

[0042] According to one embodiment of the present invention, at least a portion of the cross-section of the groove in the axial direction extends circumferentially. Specifically, the groove includes a first section and a second section. At least a portion of the cross-section of the groove in the axial direction extends circumferentially and forms the first section. The second section is connected to the first section and extends toward the stator tooth 12. The first section is provided at both ends or either end of the second section in the circumferential direction. When the protrusion moves axially to be accommodated in the groove, the first section extending circumferentially can limit the protrusion in the radial and circumferential directions, thereby effectively ensuring the stability of the connection between the protrusion and the groove, and further ensuring the normal operation of the stator tooth 12 and the stator yoke 11.

[0043] According to one embodiment of the present invention, a plurality of stator teeth 12 are stacked axially and spaced circumferentially, with a winding slot defined between two circumferentially adjacent stator teeth 12. The stator assembly 1 also includes a winding 13 wound within the winding slot. Winding 13 generates a magnetic field when current is applied, enabling normal operation of the stator assembly 1. By setting the winding groove, the winding 13 can be wound in the winding groove, and since the stator teeth 12 are arranged at intervals along the circumferential direction, the winding groove defined between two adjacent stator teeth 12 is formed with a first opening and a second opening which are arranged opposite each other from the inside to the outside in the radial direction. Therefore, during the installation of the winding 13, the winding 13 can enter the winding groove from the first opening or the second opening in the radial direction, and the winding 13 can also enter the winding groove along the axial direction of the stator tooth 12, thereby increasing the installation direction and installation space of the winding 13 and the winding groove, improving the installation convenience of the winding 13 on the stator tooth 12, and protecting the outer surface of the winding 13 from being scratched, which helps to improve the working safety of the winding 13 and extend its service life.

[0044] According to one embodiment of the present invention, a circumferentially protruding limiting portion 123 is formed at the radial inner end of the stator tooth portion 12, and the limiting portion 123 is suitable for abutting against the winding 13. The limiting portions 123 protruding toward each other of two circumferentially adjacent stator teeth 12 jointly define a first opening of a winding slot. By providing a circumferentially protruding limiting portion 123 at the radial inner end of the stator tooth portion 12, the limiting portion 123 can abut against the winding 13 to position the installation of the winding 13 on the stator tooth portion 12, and the winding slot is formed with a first opening, so that when the motor is in operation, the first opening can increase the magnetic resistance of the magnetic leakage flux in the motor, thereby reducing magnetic leakage, and thereby improving the power density and working efficiency of the motor. In addition, the first opening can also improve the assembly convenience between the winding 13 and the winding slot.

[0045] In addition, in a specific embodiment of the present invention, the winding 13 is wound in the winding slot along the outer periphery of the stator tooth portion 12 toward the center of the stator tooth portion 12 to achieve a fixed connection between the winding 13 and the stator tooth portion 12. Compared with the conventional assembly method of the flat wire winding in the prior art, which is to insert the wire axially from top to bottom, this method usually causes the flat wire enameled wire paint to be scratched or the insulation paper to crack during the assembly process due to factors such as the stator slot size design and the thickness of the insulation paper, thereby causing insulation failure. In the present invention, when the winding 13 is installed on the stator tooth portion 12, the winding 13 can be radially assembled from a second opening with a diameter larger than the first opening, and the assembly stroke is shortened from the axial length of the stator core to the depth of the winding slot, thereby reducing the possibility of damage to the winding 13 during the long axial distance assembly when entering the slot, and ensuring the winding 13 Safety; Compared with the conventional assembly direction of round wire winding and wave-wound flat wire winding in the prior art, which is from inside to outside, entering the slot from the notch of the stator slot and assembling from the inside toward the outer circle of the stator, this method is usually due to the small size of the stator slot notch. During the assembly process, the enameled wire and the notch are easy to interfere and scratch, resulting in damage to the enameled wire paint or insulating paper. In the present invention, the winding 13 can be assembled along the outer periphery of the stator tooth portion 12 toward the center of the stator tooth portion 12, thereby reducing the risk of damage to the enameled wire and insulating paper, and the electromagnetic scheme design is not limited to the size of the notch, which is conducive to the optimization design of motor performance.

[0046] In another specific embodiment of the present invention, after the winding 13, the stator teeth 12 and the stator yoke 11 are assembled into the stator assembly 1, the stator assembly 1 is insulated and cured by overall immersion in insulating paint to further increase the connection strength between the winding 13, the stator teeth 12 and the stator yoke 11, and improve the inherent mode of the stator assembly 1, thereby helping to optimize the NVH (Noise, Vibration, Harshness) performance of the motor under various operating conditions.

[0047] According to one embodiment of the present invention, a transition section 122 is formed between the second connection portion 121 and the stator tooth portion 12, and the width of the transition section 122 is smaller than that of the second connection portion 121 and the stator tooth portion 12, respectively. By providing the transition section 122, a transition can be formed between the stator tooth portion 12 and the second connection portion 121 on the outer periphery of the stator tooth portion 12. Thus, the width of the second connection portion 121 is not limited by the width of the stator tooth portion 12, which is more conducive to the optimized design of the stator assembly 1. Furthermore, the transition section 122 also improves the manufacturing convenience of the second connection portion 121 and the stator tooth portion 12, avoids the generation of burrs between the second connection portion 121 and the stator tooth portion 12, and helps improve the production quality of the second connection portion 121 and the stator tooth portion 12, thereby extending the service life of the stator assembly 1 and reducing maintenance costs.

[0048] According to one embodiment of the present invention, the width of each stator tooth 12 gradually increases in a direction approaching the stator yoke 11. Since the plurality of stator teeth 12 are collectively formed into a circular ring shape, by setting the width of each stator tooth 12 to gradually increase in a direction approaching the stator yoke 11, the winding slots between circumferentially adjacent stator teeth 12 can be constructed as parallel slots. Parallel slots have a large slot surface area and a high slot fill rate, which helps to improve the utilization rate of the iron core and enhance the uniformity of the magnetic field of the winding 13, thereby facilitating the reduction of iron loss and copper loss during motor operation, further improving the operating efficiency and performance of the motor.

[0049] The motor according to the present invention will be briefly described below.

[0050] The motor according to the present invention is provided with the stator assembly 1 described in any one of the above embodiments. Since the motor according to the present invention is provided with the stator assembly 1 described in any one of the above embodiments, the stator yoke 11 and the stator tooth 12 in the motor are respectively constructed as independent components. The stator tooth 12 can be manufactured using oriented silicon steel as raw material to reduce the iron loss of the motor and improve the operating efficiency of the motor. A first connecting portion 111 and a second connecting portion 121 are respectively formed on the stator yoke 11 and the stator tooth 12, so that the winding 13 can be wound in the winding slot along the outer periphery of the stator tooth 12 toward the center of the stator tooth 12, and then assembled with the stator yoke 11 along the axial direction together with the stator tooth 12, so as to protect the outer surface of the winding 13 from being scratched, thereby ensuring the working reliability of the stator assembly 1 and improving the working performance and safety of the motor.

[0051] The power equipment according to the present invention is briefly described below.

[0052] The power equipment according to the present invention is provided with the motor in the above embodiment. Since the power equipment according to the present invention is provided with the motor described in the above embodiment, the motor in the power equipment reduces iron loss and copper loss through the stator assembly 1, effectively improves the working efficiency of the motor, and is conducive to reducing the temperature rise of the motor under high-speed operation conditions, improving the working reliability of the motor, thereby optimizing the working performance of the power equipment and providing a better user experience.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0055] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0057] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0058] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A stator assembly for a motor, characterized in that: include: A stator yoke, wherein a receiving cavity is formed in the stator yoke, and a first connecting portion is formed on an inner wall of the receiving cavity; A stator tooth portion, wherein a second connecting portion is formed on the outer periphery of the stator tooth portion, and the second connecting portion is suitable for cooperating with the first connecting portion to connect the stator tooth portion with the stator yoke portion and accommodated in the accommodating cavity; wherein The material of the stator teeth is oriented silicon steel.

2. The stator assembly according to claim 1, characterized in that One of the first connection part and the second connection part is configured as a protrusion extending in the radial direction, and the other of the first connection part and the second connection part is configured as a groove engaged with the protrusion, and at least part of the outer surface of the protrusion and at least part of the inner surface of the groove abut against each other in the radial direction.

3. The stator assembly according to claim 2, characterized in that: The first connection portion and / or the second connection portion are moved in a direction approaching each other in the axial direction to connect the stator tooth portion with the stator yoke portion.

4. The stator assembly according to claim 3, characterized in that: The first connection portion is configured as the groove, and a width of a cross section of the groove in the axial direction gradually decreases in a radial direction toward a center of the stator yoke portion.

5. The stator assembly according to claim 4, characterized in that: The groove is configured as a trapezoidal groove recessed radially away from the stator tooth portion, the maximum width of the trapezoidal groove is greater than the slot width of the trapezoidal groove, and the second connecting portion is configured as a trapezoidal protrusion having the same or similar cross section as the trapezoidal groove.

6. The stator assembly according to any one of claims 3 to 5, characterized in that: At least part of the cross section of the groove in the axial direction extends in the circumferential direction.

7. The stator assembly according to any one of claims 1 to 6, characterized in that: The stator teeth are stacked in the axial direction and arranged at intervals in the circumferential direction, and a winding slot is defined between two adjacent stator teeth in the circumferential direction; The stator assembly further includes a winding, wherein the winding is wound in the winding slot.

8. The stator assembly according to claim 7, characterized in that A limiting portion protruding along the circumferential direction is formed at the radial inner end of the stator tooth portion, and the limiting portion is suitable for abutting against the winding.

9. The stator assembly according to claim 7 or 8, characterized in that: A transition section is formed between the second connection portion and the stator tooth portion, and a width of the transition section is smaller than that of the second connection portion and the stator tooth portion, respectively.

10. The stator assembly according to any one of claims 7 to 9, characterized in that: The width of each of the stator teeth gradually increases in a direction approaching the stator yoke.

11. A motor, characterized in that: The stator assembly comprises the stator assembly according to any one of claims 1 to 9.

12. A power device, characterized in that: Includes the motor as claimed in claim 11.

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