Stator assembly, motor and power equipment

Abstract

The invention discloses a stator assembly, a motor and power equipment, and the stator assembly comprises a stator yoke part which is internally provided with an accommodation cavity, and the inner wall of the accommodation cavity is provided with a first connection part; a second connecting part is formed on the periphery of the stator tooth part, and the second connecting part is suitable for being matched with the first connecting part so that the stator tooth part and the stator yoke part can be connected and contained in the containing cavity; wherein the stator tooth part is made of oriented silicon steel. According to the stator assembly, the stator yoke part and the stator tooth part are arranged, the stator yoke part and the stator tooth part can be connected through cooperation of the first connecting part and the second connecting part after being manufactured and formed respectively, the stator tooth part is made of oriented silicon steel, and therefore the purposes of reducing motor loss and improving motor reliability are achieved. And the motor efficiency is improved and the motor performance is optimized.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a stator assembly, a motor and a power device. Background Art

[0002] The motor is the core of new energy vehicles. With the iteration of technology, the new energy vehicle field has higher and higher requirements for the working performance of motors. After analyzing the long-term operating conditions of new energy vehicle motors, about 75% of the motor loss is composed of iron loss and mechanical loss. Therefore, reducing the motor iron loss can quickly and effectively improve the motor operating efficiency. The core material of the existing compressor permanent magnet synchronous motor is generally non-oriented electrical steel. The saturation magnetic flux density of non-oriented electrical steel is limited, which limits the performance of the motor under some special conditions. For example, under high speed or high torque operating conditions, the iron core of the motor stator, especially the stator teeth, is limited by the size of the motor. Under the condition of a certain tooth width, the increase in magnetic flux density will cause the stator core to be magnetically saturated. Once the magnetic flux density is saturated somewhere, it will inevitably cause a large amount of iron loss in the motor, thereby reducing the efficiency of the motor.

[0003] The patent with the publication number CN207782503U and the name of a oriented silicon steel stator core proposes to construct the stator core into a plurality of U-shaped cores composed of oriented silicon steel laminations to give full play to the characteristics of high magnetic permeability and low iron loss in the rolling direction of oriented electrical steel, so that the motor has the characteristics of short magnetic circuit, less magnetic leakage, low loss, low noise, high material utilization rate, high torque density, etc., and can also reduce the amount of copper wire and reduce the temperature rise of the motor. However, the U-shaped core in the patent cannot be used for the flat wire winding motor that is currently the mainstream in the motor market, and the stator teeth and yoke are both made of oriented silicon steel, which cannot meet the requirements of the yoke for the magnetic circuit of the rotating motor, but instead increases the motor loss.

[0004] In the related art, the stator core of the motor is made of non-oriented silicon steel as raw material, which leads to large iron loss of the motor under high speed or high torque operation conditions, resulting in reduced motor efficiency; while the stator core of the motor is made of oriented silicon steel as raw material, which will lead to poor uniformity of the motor stator due to the poor performance of oriented silicon steel in the non-rolling direction and the rotation characteristics of the motor, and cannot meet the requirements of the stator yoke for the rotating motor magnetic circuit, thereby increasing the motor loss and affecting the motor efficiency. In addition, the U-shaped stator core cannot be used for the flat wire winding motor that is currently the mainstream in the motor market, and its application range is small and its versatility is poor. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a stator assembly. According to the stator assembly of the present invention, a stator yoke and a stator tooth are arranged so that the stator yoke and the stator tooth can be connected by a first connection part and a second connection part after being manufactured and formed separately, wherein the material structure of the stator tooth is oriented silicon steel, thereby reducing motor loss, improving motor efficiency and optimizing motor performance.

[0006] The present invention also provides a motor having the stator assembly.

[0007] The present invention also provides a power device having the motor.

[0008] The stator assembly for a motor according to the present invention comprises: 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 of the stator tooth is oriented silicon steel.

[0009] The stator assembly of the present invention is provided with a stator yoke and a stator tooth, and a first connection portion is formed on the inner wall of the stator yoke housing cavity, and a second connection portion is formed on the outer periphery of the stator tooth, so that the second connection portion can cooperate with the first connection portion to connect the stator tooth with the stator yoke, and the stator tooth and the components installed on the stator tooth can be accommodated together in the housing cavity of the stator yoke, thereby realizing the assembly of the stator assembly. Among them, the material structure of the stator tooth is oriented silicon steel, so as to improve the magnetic permeability of the stator assembly, 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 facilitating the improvement of the cruising range of the whole vehicle. Compared with 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 using different materials and processes according to their respective working requirements, so as to achieve the purpose of accurate use of materials and optimize the performance of the stator assembly, thereby improving the motor efficiency. Since the stator yoke and the stator teeth can be manufactured separately, the present invention also improves the manufacturing convenience of the stator yoke and the stator teeth. The stator yoke can be directly wound and formed during molding, and the stator teeth can be manufactured independently, thereby avoiding the waste of materials caused in the stamping link due to the complex structure of the one-piece molding of the stator yoke and the stator teeth, thereby further improving the material utilization rate and saving economic costs. In addition, since the stator yoke and the stator teeth are connected by 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 life.

[0010] According to one embodiment of the present invention, one of the first connection part and the second connection part is constructed as a protrusion extending in the radial direction, and the other of the first connection part and the second connection 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.

[0011] According to an embodiment 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.

[0012] According to an embodiment 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.

[0013] According to one embodiment of the present invention, the groove is configured as a trapezoidal groove recessed radially away from the stator tooth, 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.

[0014] According to an embodiment of the present invention, at least part of the cross section of the groove in the axial direction extends in the circumferential direction.

[0015] According to one embodiment 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.

[0016] According to an embodiment 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.

[0017] According to an embodiment of the present invention, a transition section is formed between the second connection portion and the stator tooth portion, and the width of the transition section is smaller than that of the second connection portion and the stator tooth portion, respectively.

[0018] According to an embodiment of the present invention, the width of each stator tooth portion gradually increases in a direction approaching the stator yoke portion.

[0019] The motor according to the present invention is briefly described below.

[0020] The motor according to the present invention is provided with a stator assembly as described in any one of the above embodiments. Since the motor according to the present invention is provided with a stator assembly as described in any one of the above embodiments, the stator yoke and the stator teeth in the motor are respectively constructed as independent components, and 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 groove 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, so as to protect 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.

[0021] The power device according to the present invention is briefly described below.

[0022] 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, effectively improves the working efficiency of the motor, and is beneficial to reduce the temperature rise of the motor under high-speed operation conditions, improves the working reliability of the motor, thereby optimizing the working performance of the power equipment and providing a better user experience.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is an axial cross-sectional view of a stator assembly according to one embodiment of the present invention;

[0026] Figure 2 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;

[0027] Figure 3 It is a partial structural schematic diagram of a stator yoke, a stator tooth and a winding according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] Stator assembly 1;

[0030] stator yoke 11, first connecting portion 111;

[0031] Stator tooth portion 12, second connecting portion 121, transition section 122, limiting portion 123;

[0032] Winding 13. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] The motor is the core of new energy vehicles. With the iteration of technology, the new energy vehicle field has higher and higher requirements for the working performance of motors. After analyzing the long-term operating conditions of new energy vehicle motors, about 75% of the motor loss is composed of iron loss and mechanical loss. Therefore, reducing the motor iron loss can quickly and effectively improve the motor operating efficiency. The core material of the existing compressor permanent magnet synchronous motor is generally non-oriented electrical steel. The saturation magnetic flux density of non-oriented electrical steel is limited, which limits the performance of the motor under some special conditions. For example, under high speed or high torque operating conditions, the iron core of the motor stator, especially the stator teeth, is limited by the size of the motor. Under the condition of a certain tooth width, the increase in magnetic flux density will cause the stator core to be magnetically saturated. Once the magnetic flux density is saturated somewhere, it will inevitably cause a large amount of iron loss in the motor, thereby reducing the efficiency of the motor.

[0035] The patent with the publication number CN207782503U and the name of a oriented silicon steel stator core proposes to construct the stator core into a plurality of U-shaped cores composed of oriented silicon steel laminations to give full play to the characteristics of high magnetic permeability and low iron loss in the rolling direction of oriented electrical steel, so that the motor has the characteristics of short magnetic circuit, less magnetic leakage, low loss, low noise, high material utilization rate, high torque density, etc., and can also reduce the amount of copper wire and reduce the temperature rise of the motor. However, the U-shaped core in the patent cannot be used for the flat wire winding motor that is currently the mainstream in the motor market, and the stator teeth and yoke are both made of oriented silicon steel, which cannot meet the requirements of the yoke for the magnetic circuit of the rotating motor, but instead increases the motor loss.

[0036] In the related art, the stator core of the motor is made of non-oriented silicon steel as raw material, which leads to large iron loss of the motor under high speed or high torque operation conditions, resulting in reduced motor efficiency; while the stator core of the motor is made of oriented silicon steel as raw material, which will lead to poor uniformity of the motor stator due to the poor performance of oriented silicon steel in the non-rolling direction and the rotation characteristics of the motor, and cannot meet the requirements of the stator yoke for the rotating motor magnetic circuit, thereby increasing the motor loss and affecting the motor efficiency. In addition, the U-shaped stator core cannot be used for the flat wire winding motor that is currently the mainstream in the motor market, and its application range is small and its versatility is poor.

[0037] Reference below Figure 1-Figure 3 A stator assembly 1 according to an embodiment of the present invention is described.

[0038] The stator assembly 1 for a motor according to the present invention includes a stator yoke 11 and a stator tooth 12. As part of the magnetic circuit of the motor, the stator tooth 12 and the stator yoke 11 have the function of conducting magnetic flux to realize the conversion of energy in the motor. Among them, a housing cavity is formed in the stator yoke 11, and a first connecting portion 111 is formed on the inner wall of the housing cavity; the stator tooth 12 can provide a mounting position for some other components in the stator assembly 1, and a second connecting portion 121 is formed on the outer periphery of the stator tooth 12, and the second connecting portion 121 is suitable for cooperating with the first connecting portion 111 to connect the stator tooth 12 with the stator yoke 11 and accommodate it in the housing cavity, so that the stator tooth 12 and the stator yoke 11 form a whole; wherein the material structure of the stator tooth 12 is oriented silicon steel. Oriented silicon steel has the advantages of low iron loss, high magnetic induction intensity, and low magnetostriction, so that the stator assembly 1 can have good electromagnetic properties, reduce the iron loss of the motor, and improve the performance of the motor.

[0039] The stator assembly 1 of the present invention is provided with a stator yoke 11 and a stator tooth 12, and a first connection portion 111 is formed on the inner wall of the accommodating cavity of the stator yoke 11, and a second connection portion 121 is formed on the outer periphery of the stator tooth 12, so that the second connection portion 121 can cooperate with the first connection portion 111 to connect the stator tooth 12 with the stator yoke 11, and the stator tooth 12 and the components installed on the stator tooth 12 can be accommodated together in the accommodating cavity of the stator yoke 11, thereby realizing the assembly of the stator assembly 1. Among them, the material structure of the stator tooth 12 is oriented silicon steel, so as 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 facilitating the improvement of the cruising range of the whole 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 the motor loss and affecting the motor efficiency. In the present invention, the stator yoke 11 and the stator tooth 12 are respectively constructed as two independent parts, so that the stator yoke 11 and the stator tooth 12 can be made of different materials and The present invention also improves the manufacturing convenience of the stator yoke 11 and the stator tooth 12. The stator yoke 11 can be directly wound during molding, and the stator tooth 12 can be manufactured independently, thereby avoiding the waste of materials in the stamping process due to the complex structure of the one-piece molding of the stator yoke 11 and the stator tooth 12, thereby further improving the material utilization rate and saving economic costs. In addition, since the stator yoke 11 and the stator tooth 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 12 can be separately installed and fixed on the stator tooth 12 before the stator tooth 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 12, increasing the assembly direction and space of the components on the stator tooth 12, effectively improving the installation convenience of the components on the stator tooth 12, and helping to protect the components on the stator tooth 12 from being scratched, thereby helping to improve the safety of the stator assembly 1 and extend its service life.

[0040] In addition, in a specific embodiment of the present invention, the material of the stator yoke 11 is non-oriented silicon steel. Since the magnetic conductivity of non-oriented silicon steel is basically consistent in all directions and has the effect of reducing coercive force, core loss and magnetic aging, the magnetic flux density of the stator yoke 11 is balanced by constructing the material of the stator yoke 11 as non-oriented silicon steel, so that the stator yoke 11 can have good working performance.

[0041] 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.

[0042] According to one embodiment of the present invention, the first connection part 111 and the second connection part 121 are configured to be engaged with each other by a protrusion and a groove. In the stator assembly 1 of this embodiment, the first connection part 111 can be configured as a protrusion extending in the radial direction, and the second connection part 121 can be configured as a groove engaged with the protrusion; in the stator assembly 1 of this embodiment, the second connection part 121 can also be configured as a protrusion extending in the radial direction, and the first connection part 111 can be configured as a groove engaged with the protrusion. Among them, 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. 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 snap-fitted with the protrusion, the stator yoke 11 and the stator tooth 12 can be quickly and easily assembled by snap-fitting, thereby improving the assembly efficiency of the stator assembly 1. When the protrusion is snap-fitted 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 abut in the radial direction, 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.

[0043] 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 in a direction close to each other to connect the stator tooth portion 12 with the stator yoke portion 11. It can be understood that the moving 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 in a direction close to 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.

[0044] 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, and 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 along the axial direction toward each other until the first connection part 111 is engaged with the second connection part 121, so that the assembly of the stator yoke part 11 and the stator tooth part 12 is completed.

[0045] 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, and 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 connection stability between the stator tooth portion 12 and the stator yoke 11, and thus ensuring the working reliability and safety of the stator assembly 1.

[0046] According to one embodiment of the present invention, the groove is constructed as a trapezoidal groove which 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 radially open toward the stator tooth portion 12, and the second connecting portion 121 is constructed as a trapezoidal protrusion having 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 connect with 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 protrusions, thereby further improving the stability of the connection between the stator tooth portion 12 and the stator yoke portion 11 .

[0047] According to one embodiment of the present invention, at least part of the cross section of the groove in the axial direction extends in the circumferential direction. Specifically, the groove includes a first section and a second section, at least part of the cross section of the groove in the axial direction extends in the circumferential direction and forms the first section, the second section is connected to the first section and extends toward the stator tooth 12, and the first section is arranged at both ends or any one end of the second section in the circumferential direction. When the protrusion moves axially to be accommodated in the groove, the first section extending in the circumferential direction can play a radial and circumferential limiting role on the protrusion, thereby effectively ensuring the connection stability between the protrusion and the groove, and further ensuring the normal operation of the stator tooth 12 and the stator yoke 11.

[0048] According to one embodiment of the present invention, the stator teeth 12 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 12 in the circumferential direction. The stator assembly 1 also includes a winding 13, which is wound in the winding slot. The winding 13 can generate a magnetic field after current is turned on to achieve 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 tooth portion 12 is arranged at intervals along the circumferential direction, the winding groove defined between two adjacent stator tooth portions 12 is formed with a first opening and a second opening which are arranged opposite to each other from the inside to the outside in the radial direction, so that 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 portion 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 portion 12, and being beneficial to 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.

[0049] According to one embodiment of the present invention, a limiting portion 123 protruding in the circumferential direction 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 setting the limiting portion 123 protruding in the circumferential direction 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 then improving the power density and working efficiency of the motor. In addition, the first opening can also improve the convenience of assembly between the winding 13 and the winding slot.

[0050] 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 insulating paper to crack during the assembly process due to factors such as the stator slot size design and the thickness of the insulating paper, 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 stroke assembly when entering the slot, and ensuring the winding 13. Safety; compared with the conventional assembly direction of round wire windings and wave-wound flat wire windings in the prior art, which is from the inside to the 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 notch size, which is beneficial to the optimization design of motor performance.

[0051] 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.

[0052] 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, so that 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. In addition, 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 is conducive to improving 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 saving maintenance costs.

[0053] According to one embodiment of the present invention, the width of each stator tooth 12 gradually increases in the direction approaching the stator yoke 11. Since the plurality of stator teeth 12 are generally in the shape of a ring, by setting the width of each stator tooth 12 to gradually increase in the direction approaching the stator yoke 11, the winding slots between adjacent stator teeth 12 in the circumferential direction can be constructed as parallel slots, and the 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 the uniformity of the magnetic field of the winding 13, thereby helping to reduce the iron loss and copper loss during the operation of the motor, and further improve the working efficiency and performance of the motor.

[0054] The motor according to the present invention is briefly described below.

[0055] The motor according to the present invention is provided with a stator assembly 1 as described in any one of the above embodiments. Since the motor according to the present invention is provided with the stator assembly 1 as 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, and 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 around the winding groove 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.

[0056] The power device according to the present invention is briefly described below.

[0057] 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 beneficial to reduce the temperature rise of the motor under high-speed operation conditions, improves the working reliability of the motor, thereby optimizing the working performance of the power equipment and providing a better user experience.

[0058] 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 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, 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 limiting the present invention.

[0059] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0060] In the description of the present invention, "plurality" means two or more.

[0061] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0062] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

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 claim 3, 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 claim 1, 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, 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 claim 7, 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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