Motor stator core structure

Abstract

The embodiment of the invention discloses a motor stator core structure, the motor stator core structure comprises a stator yoke part and a stator tooth part, and the inner diameter side of the stator yoke part is clamped and matched with the outer diameter side of the stator tooth part; the stator tooth part is in a ring shape formed by connecting a tooth part chain end to end, the tooth part chain adopts oriented silicon steel, and the orientation direction of the oriented silicon steel is the extension direction of stator teeth in the tooth part chain; the outer peripheral surface of the stator tooth part is provided with at least one fabrication hole. The yoke part and the tooth part of the motor stator core are independent structures, the stator tooth part is made of oriented silicon steel, the stator tooth part is of a chain type structure, and the outer diameter side of the stator tooth part is provided with a process hole which can accommodate a deformation part formed during welding and winding of a tooth part chain, so that the influence on the assembly effect of the stator tooth part and the stator yoke part is avoided; the motor stator iron core is simple in overall structure and easy to manufacture, equivalent air gaps in a stator are reduced through the design of the chain type tooth parts, and the application effect of oriented silicon steel is prevented from being affected.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a structure of a motor stator core. Background Art

[0002] As a core component of new energy vehicles, the operating efficiency, comfort and cost performance of drive motors are particularly important. During long-term operation of traditional drive motors, due to motor losses such as iron loss and mechanical loss, it is difficult for the operating efficiency of drive motors to meet the performance requirements of new energy vehicles.

[0003] In order to reduce the iron loss of drive motors and improve the operating efficiency of drive motors, grain-oriented silicon steel is currently used to replace traditional non-oriented silicon steel as the material for manufacturing the core of drive motors. For example, Figure 1 the shown scheme is that the stator core adopts a tooth-yoke separation structure. The yoke part 1' of the stator is an integral body made of non-oriented silicon steel, and the tooth part 2' of the stator is made of grain-oriented silicon steel. The tooth part 2' of the stator is divided into several pieces and finally assembled together. Although this scheme uses grain-oriented silicon steel to improve the saturation magnetic density and torque density of the motor, due to the large number of divided pieces, the process difficulty is greatly increased and mass production is difficult to achieve.

[0004] In order to solve the above problems, a new stator core structure scheme has emerged. As shown in Figure 2 、 Figure 3 , the stator core also adopts a tooth-yoke separation structure. The stator yoke part adopts a chain structure, which consists of a plurality of long-strip yoke monomers 4' and a plurality of bending parts. The tooth part is also an integral body, and a plurality of tooth monomers 3' are connected in sequence to form a chain structure. This structure theoretically reduces the number of iron cores in the yoke part and reduces the process difficulty. However, due to the closure of the stator slot opening and the increase in the equivalent air gap of the chain yoke, the application effect of grain-oriented silicon steel is greatly reduced.

[0005] Therefore, a stator core structure scheme is needed, which uses grain-oriented silicon steel material to make the stator core, has a relatively low process difficulty, does not affect the application effect of grain-oriented silicon steel, can effectively reduce the iron loss of the drive motor, and improve the operating efficiency of the drive motor. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a structure of a motor stator core to achieve the effects of simple structure, easy manufacturing without affecting the application effect of grain-oriented silicon steel.

[0007] Specifically, the present invention provides a structure of a motor stator core, the motor stator core structure includes a stator yoke part and a stator tooth part, and the inner diameter side of the stator yoke part is clamped and matched with the outer diameter side of the stator tooth part;

[0008] The stator tooth part is an annular shape formed by connecting the head and tail of a tooth part chain. The tooth part chain is made of grain-oriented electrical steel, and the orientation direction of the grain-oriented electrical steel is the extending direction of the stator teeth in the tooth part chain.

[0009] At least one process hole is provided on the outer peripheral surface of the stator tooth part.

[0010] The yoke part and the tooth part of the motor stator core are independent structures. The stator tooth part is made of grain-oriented electrical steel, and the stator tooth part adopts a chain structure. Moreover, a process hole is opened on the outer diameter side of the stator tooth part, which can accommodate the deformation part formed during welding and winding of the tooth part chain, avoiding affecting the assembly effect of the stator tooth part and the stator yoke part. The overall structure of the motor stator core is simple and easy to manufacture. The design of the chain-shaped tooth part reduces the equivalent air gap in the stator and avoids affecting the application effect of the grain-oriented electrical steel.

[0011] In an embodiment of the above motor stator core structure, the tooth part chain includes at least two tooth part units, and each tooth part unit includes a stator tooth.

[0012] The width of the stator tooth in the circumferential direction at one end on the outer diameter side of the stator tooth part is greater than or equal to the width in the circumferential direction at one end on the inner diameter side of the stator tooth part.

[0013] The width of the stator tooth in the circumferential direction at one end on the outer diameter side of the tooth part unit of the stator tooth part is greater than or equal to the width in the circumferential direction at one end on the inner diameter side, which can effectively reduce the magnetic loss of the motor and improve the operating efficiency of the drive motor.

[0014] In an embodiment of the above motor stator core structure, one end of the stator tooth on the inner diameter side of the stator tooth part extends outwards to both sides to form a first extension part, and a gap is provided between the first extension parts of two adjacent stator teeth.

[0015] One end of the stator tooth on the outer diameter side of the stator tooth part extends circumferentially to form a second extension part, and the second extension parts of two adjacent stator teeth are connected. The process hole is opened on the surface of the connection of the second extension parts of two adjacent stator teeth facing away from the first extension part.

[0016] The stator teeth are connected through the second extension parts, and the process hole is opened on the surface of the connection of the second extension parts of two adjacent stator teeth facing away from the first extension part, which can offset the deformation generated by welding and bending of the stator teeth to the greatest extent, thus ensuring that the assembly effect of the stator tooth part and the stator yoke part is not affected.

[0017] In an embodiment of the above motor stator core structure, the projection of the process hole on the end surface of the stator core along the central axis direction of the stator core is any one of a quasi-triangle, a quasi-trapezoid, and a quasi-rectangle.

[0018] The projection of the process hole on the end face of the stator core along the central axis direction of the stator core is any one of a quasi-triangle, a quasi-trapezoid, and a quasi-rectangle, and the effect of offsetting deformation is better.

[0019] In an embodiment of the above-mentioned motor stator core structure, the tooth portion unit further includes a protruding portion extending toward the stator yoke portion.

[0020] A protruding portion extends from the outer peripheral surface of the motor stator tooth portion toward the stator yoke portion. The protruding portion is aligned with the easy magnetization direction of the oriented silicon steel stator tooth portion, which can reduce magnetic loss and improve the operating efficiency of the motor.

[0021] In an embodiment of the above-mentioned motor stator core structure, the orientation direction of the oriented silicon steel of the protruding portion is the same as the orientation of the stator tooth portion.

[0022] In the above-mentioned motor stator core structure, the protruding portion has a shape with sides such as a triangle or a trapezoid, and the side length of the protruding portion is L; the minimum width of the stator tooth at the first extension portion in the extension direction is H; L≥H.

[0023] This is because H is the place where the magnetic resistance of the tooth portion is the largest. In order for the magnetic resistance of the connection with the yoke portion not to be greater than the maximum magnetic resistance of the tooth portion, the above requirements are there. If L < H, the magnetic resistance at the connection between the stator yoke portion and the tooth portion is too large, becoming the magnetic resistance bottleneck of the magnetic circuit. In an embodiment of the above-mentioned motor stator core structure, the tooth portion chain is composed of a plurality of circumferentially arranged tooth portion monomers connected together;

[0024] The number of the tooth portion monomers is greater than or equal to twice the number of rotor pole pairs of the motor and less than the number of stator slots in the stator core.

[0025] The tooth portion chain is composed of tooth portion monomers with a number greater than or equal to twice the number of rotor pole pairs of the motor and less than the number of stator slots in the stator core, which greatly improves the material utilization rate of silicon steel, the power density, torque density and high-efficiency range of the motor, making the motor have a higher cost performance.

[0026] In an embodiment of the above-mentioned motor stator core structure, clamping blocks and clamping grooves matching the clamping blocks are respectively arranged at both ends of the tooth portion monomer.

[0027] The segmented tooth portion monomers are connected by clamping, which is easy to manufacture and assemble, and can reduce iron loss.

[0028] In an embodiment of the above-mentioned motor stator core structure, the tooth portion unit is linear in the length direction or an arc shape adapted to the stator yoke portion.

[0029] In an embodiment of the above-mentioned motor stator core structure,

[0030] When the stator yoke is an oriented silicon steel stator yoke, the stator yoke is formed by helically winding and stacking a yoke-oriented steel strip, and the orientation direction of the yoke-oriented steel strip is its length direction.

[0031] When the stator yoke is made of oriented silicon steel, the orientation direction of the yoke-oriented steel strip wound and stacked to form the stator yoke is its length direction, which is consistent with the magnetic circuit direction during the operation of the motor, reducing the magnetic circuit loss.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Referring to the accompanying drawings, the disclosure of the present invention will become more readily understood. It is readily understood by those skilled in the art that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, where:

[0034] Figure 1 is a schematic structural diagram of a stator core with a tooth-yoke separation structure in the prior art;

[0035] Figure 2 is a schematic structural diagram of a stator core with a tooth-yoke separation structure and a chain structure for the stator yoke in the prior art;

[0036] Figure 3 is Figure 2 the layout diagram of the tooth chain in the stator core in

[0037] Figure 4 is a schematic structural diagram of a motor stator core structure provided by one embodiment of the present application;

[0038] Figure 5 is a front view of the tooth chain in the stator core structure provided by one embodiment of the present application before welding;

[0039] Figure 6 is a structural diagram of the stator teeth formed by welding the tooth chain in the stator core structure provided by one embodiment of the present application;

[0040] Figure 7 is a schematic diagram of two adjacent tooth units in the tooth chain in the stator core structure provided by one embodiment of the present application;

[0041] Figure 8 is a schematic diagram of a stator core structure provided by another embodiment of the present application;

[0042] Figure 9It is a three-dimensional view of a tooth unit in the stator core structure provided by an embodiment of the present application;

[0043] Figure 10 It is a front view of a tooth unit in the stator core structure provided by an embodiment of the present application;

[0044] Figure 11 It is a schematic structural diagram of a stator yoke in the stator core structure provided by an embodiment of the present application.

[0045] Wherein: 1. Stator yoke; 11. Yoke-oriented steel strip; 2. Stator tooth part; 21. Tooth part chain; 211. Stator tooth; 212. First extension part; 213. Second extension part; 214. Protrusion part; K. Welding position; 22. Process hole; 23. Tooth unit; 231. Clamping block; 232. Card slot; 1'. Yoke part; 2'. Tooth part; 3'. Tooth unit; 4'. Yoke unit. Detailed implementation manners

[0046] Some embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0047] As described in the background art, reducing the iron loss of the motor can quickly and effectively improve the operating efficiency of the motor. The core materials of traditional permanent magnet synchronous motors for compressors generally use non-oriented electrical steel. The saturation magnetic density of non-oriented electrical steel is limited, which limits the performance of the motor under some special working conditions. For example, under the working conditions of high speed or high torque operation, the core of the motor stator, especially the stator tooth part, due to the limitation of the motor size, when the tooth width is certain, the increase of the magnetic density will cause the phenomenon of magnetic saturation of the stator core. Once the magnetic density is saturated at a certain place, it will inevitably cause a large amount of iron loss of the motor, thus reducing the efficiency of the motor.

[0048] Based on the above problems, at present, the cores of permanent magnet synchronous motors using grain-oriented silicon steel materials have gradually emerged. They mainly adopt the block technology of grain-oriented silicon steel, but they are all for concentrated wound cores, and there are problems such as a large number of tooth blocks causing great process difficulty. Although there are targeted improvements, they also bring greater efficiency losses, greatly reducing the application effect of grain-oriented silicon steel. When applied to multi-slot pole distributed wound motors for new energy vehicles, similar process problems are more prominent.

[0049] To solve the above problems, the present application creatively proposes a structure of a motor stator core. The stator yoke and the stator teeth are clamped and matched. At least the stator teeth are made of oriented silicon steel. The stator teeth are formed by connecting the tooth chains end to end. Process holes are provided on the outer diameter side of the tooth chain to offset the deformation generated during the connection and bending of the tooth chain. The overall structure is simple and easy to manufacture, reducing the equivalent air gap in the stator and avoiding affecting the application effect of the oriented silicon steel.

[0050] The present invention will be specifically described below through specific embodiments.

[0051] Specifically, an embodiment of the present application provides a structure of a motor stator core. Referring to Figure 4 as shown, the stator core structure includes a stator yoke 1 and stator teeth 2. The inner diameter side of the stator yoke 1 is clamped and matched with the outer diameter side of the stator teeth 2;

[0052] Referring to Figures 5 to 7 as shown, the stator teeth 2 are formed into a ring by connecting a tooth chain 21 end to end. The tooth chain 21 is made of oriented silicon steel, and the orientation direction of the oriented silicon steel is the extending direction of the stator teeth in the tooth chain 21; at least one process hole 22 is provided on the outer peripheral surface of the stator teeth 2. Exemplarily, the head and tail ends of the tooth chain 21 are welded together to form the ring-shaped stator teeth 2; process holes 22 for offsetting deformation are provided on the outer diameter side of the tooth chain 21, and at least one process hole 22 is located on the outer peripheral surface of the stator teeth 2 corresponding to the welding position K of the tooth chain 21. As Figure 6 shown, after the end faces of the two ends of the tooth chain 21 are fitted together, the end face fitting surfaces of the two ends are welded. The joint of the two end faces is the welding position K. After the two end faces are welded together, at least one process hole 22 is formed on the outer peripheral surface corresponding to the welding position K, that is, on the outer diameter side fitting line at the joint of the two end faces.

[0053] The yoke and the teeth of the motor stator core are independent structures. The stator teeth 2 are made of oriented silicon steel, the stator teeth 2 adopt a chain structure, and process holes 22 are provided on the outer diameter side of the stator teeth 2, which can accommodate the deformation part formed when the tooth chain 21 is connected end to end and wound, avoiding affecting the assembly effect of the stator teeth 2 and the stator yoke 1. The overall structure of the motor stator core is simple and easy to manufacture. The design of the chain-shaped teeth reduces the equivalent air gap in the stator and avoids affecting the application effect of the oriented silicon steel.

[0054] In some embodiments, referring to Figures 5 to 7 as shown, the tooth chain 21 includes at least two tooth units, and each tooth unit includes a stator tooth 211;

[0055] The width of the stator tooth 211 in the circumferential direction at one end on the outer diameter side of the stator tooth portion 2 is greater than or equal to the width in the circumferential direction at one end on the inner diameter side of the stator tooth portion 2, that is, the side length of the quadrilateral projection on the side of the stator tooth portion 2 at the outer diameter end is greater than or equal to the side length of the side on the inner diameter side of the stator tooth portion 2.

[0056] The stator tooth 211 has a certain thickness, which refers to the length of the stator tooth 211 in the axial direction of the stator core. The orthographic projection of the stator tooth 211 on the end face of the stator core along the central axis direction of the stator core can be a rectangle or a trapezoid. The fact that the width of the stator tooth 211 in the circumferential direction at one end on the outer diameter side of the stator tooth portion 2 is greater than or equal to the width in the circumferential direction at one end on the inner diameter side of the stator tooth portion 2 means that: when the orthographic projection of the stator tooth 211 on the end face of the stator core along the central axis direction of the stator core is a rectangle, the length of a parallel side of the rectangular orthographic projection away from the center of the stator core is equal to the length of a parallel side close to the center of the stator core; when the orthographic projection of the stator tooth 211 on the end face of the stator core along the central axis direction of the stator core is a trapezoid, the two parallel sides of the trapezoidal orthographic projection are the two sides away from and close to the center of the stator core respectively, and among them, the length of a parallel side of the trapezoidal orthographic projection away from the center of the stator core is greater than the length of a parallel side close to the center of the stator core.

[0057] The fact that the width of the stator tooth 211 of the stator tooth portion in the circumferential direction at one end on the outer diameter side of the stator tooth portion 2 is greater than or equal to the width in the circumferential direction at one end on the inner diameter side of the stator tooth portion 2 can effectively reduce the magnetic loss of the motor and improve the operating efficiency of the drive motor.

[0058] In some embodiments, continue to refer to Figure 7 As shown, at one end in the circumferential direction on the inner diameter side of the stator tooth portion, the stator tooth 211 extends to both sides to form a first extension portion 212. A gap is provided between the first extension portions 212 of two adjacent stator teeth 211 to form the toothed end of the stator tooth portion.

[0059] At one end in the circumferential direction on the outer diameter side of the stator tooth portion 2, the stator tooth 211 extends to form a second extension portion 213. The second extension portions 213 of two adjacent stator teeth 211 are connected to each other, and the process hole 22 is opened on the surface of the connection of the second extension portions 213 of two adjacent stator teeth 211, which faces away from the first extension portion 212.

[0060] Specifically, process holes 22 are provided on the surface of the connection between the second extension portions 213 of every two adjacent stator teeth 211, which faces away from the first extension portion 212. Since the stator teeth 211 have a certain thickness in the axial direction of the stator core, one process hole 22 can be provided on the surface of the connection between the second extension portions 213 of every two adjacent stator teeth 211, which faces away from the first extension portion 212, or at least two process holes 22 can be provided. When at least two process holes 22 can be provided on the surface of the connection between the second extension portions 213 of every two adjacent stator teeth 211, which faces away from the first extension portion 212, the at least two process holes 22 are arranged at equal intervals along the direction parallel to the central axis of the stator core, and the number of process holes 22 at the connection of each second extension portion 213 is equal and the intervals are the same.

[0061] The stator teeth 211 are joined by the second extension portions 213, and the process holes 22 are provided on the surface of the connection between the second extension portions 213 of two adjacent stator teeth 211, which faces away from the first extension portion 212, and can offset the deformation generated by welding and bending of the stator teeth 211 to the greatest extent, so as to ensure that the assembly effect of the stator tooth portion 2 and the stator yoke portion 1 is not affected.

[0062] In some embodiments, referring to Figure 7 As shown, the projection of the process hole 22 on the end face of the stator core along the central axis direction of the stator core is any one of a quasi-triangle, a quasi-trapezoid, and a quasi-rectangle.

[0063] The projection of the process hole 22 on the end face of the stator core along the central axis direction of the stator core is any one of a quasi-triangle, a quasi-trapezoid, and a quasi-rectangle, and the effect of offsetting the deformation generated by bending of the tooth portion chain 21 is better.

[0064] In some embodiments, the tooth portion unit further includes a protruding portion 214 extending towards the stator yoke portion 1. The extending direction of the protruding portion 214 is the same as the rolling direction of the stator tooth portion 2, and the rolling direction of the stator tooth portion 2 is the radial direction of the stator core.

[0065] A protruding portion 214 extends from the outer peripheral surface of the motor stator tooth portion 2 towards the stator yoke portion 1. The extending direction of the protruding portion 214 is the same as the rolling direction of the stator tooth portion 2, which is the radial direction of the stator core, that is, the extending direction of the protruding portion 214 is consistent with the easy magnetization direction of the grain-oriented silicon steel stator tooth portion, and can reduce magnetic loss and improve the operating efficiency of the motor.

[0066] In some embodiments, the orientation direction of the grain-oriented silicon steel of the protruding portion 214 is the same as the orientation of the stator tooth portion 2.

[0067] In some embodiments, the protruding portion 214 has a shape with side edges, and the side edge length of the protruding portion 214 is L;

[0068] The minimum width of the stator tooth at the first extension portion 212 is H;

[0069] L ≥ H.

[0070] Preferably, the thickness of the protruding portion 214 and the stator tooth 211 in the axial direction of the stator core is the same, and the orthographic projection of the protruding portion 214 on the end face of the stator core is a quasi-triangular projection; a quasi-triangle refers to a shape with a smooth and curved angle at the corner of the triangle. The quasi-triangular projection includes a first side, a second side, and a third side connected end to end. The first side is collinear with the side of the quadrilateral projection adjacent to one end of the outer peripheral surface of the stator tooth portion 2, and the second side and the third side are the side edges of the protruding portion 214; the first side being collinear with the side of the quadrilateral projection adjacent to one end of the outer peripheral surface of the stator tooth portion 2 means that the first side and the side of the quadrilateral projection adjacent to one end of the outer peripheral surface of the stator tooth portion 2 fall on the same line. The first side being collinear with the side of the quadrilateral projection adjacent to one end of the outer peripheral surface of the stator tooth portion 2 means that the first side and the side of the quadrilateral projection adjacent to one end of the outer peripheral surface of the stator tooth portion 2 can have the same starting point and the same ending point, or the same starting point but different ending points, or different starting points but the same ending point, or different starting points and different ending points.

[0071] The angle of the vertex angle opposite to the first side in the quasi-triangular projection is 50° to 120°. Exemplarily, one side of the protruding portion 214 coincides with the edge of the stator tooth 211 at the end away from the central axis of the stator core, and the angle of the angle opposite to this side can be 50°, 53°, 55°, 57°, 60°, 65°, 70°, 75°, 80°, 90°, 100°, 110°, 120°, or any point value within the range of the above angle values. Preferably, the angle of the vertex angle opposite to the first side in the quasi-triangular projection is 50° to 60°. The lengths of the second side and the third side are both greater than or equal to the width of the stator tooth 211 in the circumferential direction at one end on the inner diameter side of the stator tooth portion 2. Since the one end of the stator tooth 211 on the inner diameter side of the stator tooth portion 2 is the place where the tooth reluctance is the largest, in order to ensure that the reluctance of the connection with the yoke is not greater than the maximum tooth reluctance, the above requirements are set. Without this kind of setting, the reluctance at the connection between the yoke and the tooth portion is too large, becoming the magnetic reluctance bottleneck of the magnetic circuit.

[0072] The second side and the third side can be of the same length or different lengths. However, regardless of whether the lengths of the second side and the third side are the same, the lengths of the second side and the third side are not less than the width of the stator tooth 211 in the circumferential direction at one end on the inner diameter side of the stator tooth portion 2, that is, the length of the side edge of the protruding portion 214 is not less than the minimum width of the stator tooth at the first extension portion 212. Preferably, the second side and the third side are of the same length, with a more beautiful and symmetric structure and being easier to manufacture.

[0073] It should be noted that in this embodiment, the stator teeth 211, the first extension 212, the second extension 213, and the protruding part 214 are only distinguished for the convenience of description. In fact, the stator teeth 211, the first extension 212, the second extension 213, and the protruding part 214 are integrally formed.

[0074] In some embodiments, referring to Figure 8 As shown, the tooth chain 21 is composed of a plurality of circumferentially arranged tooth monomers 23 connected together. The number of tooth monomers 23 is greater than or equal to twice the number of rotor pole pairs of the motor and less than the number of stator slots in the stator core.

[0075] The tooth chain 21 is composed of tooth monomers 23 that are greater than or equal to twice the number of rotor pole pairs of the motor and less than the number of stator slots in the stator core, and is assembled in blocks, which greatly improves the material utilization rate of silicon steel, the power density, torque density, and high-efficiency range of the motor, making the motor have a higher cost performance.

[0076] As a preference, the tooth chain 21 is composed of an even number of tooth monomers 23 that are assembled together. All the tooth monomers 23 have the same shape and size. After assembly, the force is more evenly distributed during the operation of the motor, it is not easy to wear, and the assembly is simpler. Exemplarily, the stator tooth part 2 is composed of 8 identical tooth monomers 23 connected end to end and assembled together.

[0077] Preferably, referring to Figure 9 As shown, clamping blocks 231 and clamping grooves 232 matching the clamping blocks 231 are respectively arranged at both ends of the tooth monomer 23.

[0078] Exemplarily, the clamping block 231 is triangular-like or arc-shaped.

[0079] When the clamping block 231 is triangular-like, the angle of the corner of the clamping block 231 away from the tooth monomer 23 where it is located is preferably 30° - 60°. Exemplarily, the angles of the corner of the clamping block 231 away from the tooth monomer 23 where it is located are 30°, 35°, 40°, 45°, 50°, 55°, 60°, or any angle point value within the above angle value range. The angle of the corner of the clamping block 231 away from the tooth monomer 23 where it is located is preferably 30° - 60°, which is relatively sharp and is easier to push in when inserted into the clamping groove 232 for cooperation.

[0080] The segmented tooth monomers 23 are connected end to end through a triangular-like or arc-shaped clamping structure, which is easy to manufacture and assemble, and can reduce iron loss.

[0081] Similar to the tooth units in the tooth chain 21, the tooth monomer 23 also includes stator teeth, a first extension part and a second extension part respectively extending outward from both ends of the stator teeth, and a protruding part. However, there is no process hole 22 at the connection of the second extension part in the tooth monomer 23. In addition, the orthographic projection of the protruding part in the tooth monomer 23 on the end face of the stator core is trapezoidal, and the longer one of the two parallel sides in the trapezoid coincides with the edge of the end face of the stator tooth located on the outer diameter side of the stator core. Whether it is the tooth unit or the tooth monomer 23, the thicknesses of the first extension part 212, the second extension part 213, and the protruding part 214 in the axial direction of the stator core are the same as the thickness of the stator tooth 211 in the axial direction of the stator core.

[0082] In some embodiments, the tooth unit is linear in the length direction or arc-shaped adapted to the stator yoke 1.

[0083] The tooth unit is linear in the length direction or arc-shaped adapted to the stator yoke 1, which is convenient for the stator yoke 1 and the stator tooth part 2 to form a stator core by interference fit, easy to assemble, and has a stable and firm structure. And the stator yoke 1 that is interference-fitted with the stator tooth part 2 can limit the stator tooth part 2 in the axial direction of the stator core, preventing the components of the stator tooth part 2 from displacing in the axial direction of the stator core.

[0084] In some embodiments, when the stator yoke 1 is an oriented silicon steel stator yoke, refer to Figure 11 As shown, the stator yoke 1 is made by helically winding and stacking a yoke-oriented steel strip 11. The orientation direction of the yoke-oriented steel strip 11 is its length direction. That is, the winding direction of the yoke-oriented steel strip 11 is the same as the rolling direction of the stator yoke 1, and the yoke-oriented steel strip 11 is helically wound and stacked along the circumferential direction of the stator core. The rolling direction of the stator yoke 1 is the circumferential direction of the stator core.

[0085] When the stator yoke 1 is made of oriented silicon steel, the winding direction of the yoke-oriented steel strip 11 that is helically wound and stacked to form the stator yoke 1 is its length direction, and it is wound along the circumferential direction of the stator core, which is consistent with the magnetic circuit direction during the operation of the motor, reducing the magnetic circuit loss.

[0086] Refer to Figure 11 As shown, the yoke-oriented steel strip 11 is a thin flat strip with a certain width and one end edge being tooth-shaped. When the yoke-oriented steel strip 11 is helically wound and stacked, the tooth-shaped edges of the yoke-oriented steel strip 11 overlap in the thickness direction of the yoke-oriented steel strip 11 to form a groove that is clamped and matched with the outer diameter surface of the stator tooth part 2, while the edges of the yoke-oriented steel strip 11 opposite to the tooth-shaped edges overlap to form a smooth outer peripheral surface of the cylindrical stator yoke 1.

[0087] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions 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 a suitable manner in any one or more embodiments or examples.

[0088] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0089] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A motor stator core structure, characterized in that: The motor stator core structure comprises a stator yoke and a stator tooth, wherein the inner diameter side of the stator yoke is snap-fitted with the outer diameter side of the stator tooth; The stator teeth are in a ring shape formed by connecting a tooth chain end to end, the tooth chain is made of oriented silicon steel, and the orientation direction of the oriented silicon steel is the extension direction of the stator teeth in the tooth chain; The outer circumferential surface of the stator tooth portion is provided with at least one process hole.

2. The motor stator core structure according to claim 1, characterized in that: The tooth chain comprises at least two tooth units, each of which comprises stator teeth; The width of the stator tooth in the circumferential direction at one end on the outer diameter side of the stator tooth portion is greater than or equal to the width of the stator tooth in the circumferential direction at one end on the inner diameter side of the stator tooth portion.

3. The motor stator core structure according to claim 2, characterized in that: The stator teeth extend a first extension portion to both sides in a circumferential direction at one end on the inner diameter side of the stator tooth portion, and a gap is provided between the first extension portions of two adjacent stator teeth.

4. The motor stator core structure according to claim 2 or 3, characterized in that: The projection of the process hole on the end surface of the stator core along the central axis direction of the stator core is any one of a quasi-triangle, a quasi-trapezoidal shape and a quasi-rectangular shape.

5. The motor stator core structure according to claim 4, characterized in that: The tooth unit further includes a protrusion extending toward the stator yoke.

6. The motor stator core structure according to claim 5, characterized in that: The orientation direction of the oriented silicon steel of the protrusion is consistent with the orientation direction of the stator teeth.

7. The motor stator core structure according to claim 6, characterized in that: The protrusion is in a shape with a side, and the length of the side of the protrusion is L; The minimum width of the stator tooth at the first extension portion is H; L≥H.

8. The motor stator core structure according to claim 1, characterized in that: The tooth chain is composed of a plurality of tooth monomers arranged circumferentially and connected; The number of the tooth unit cells is greater than or equal to twice the number of rotor pole pairs of the motor, and less than the number of stator slots in the stator core.

9. The motor stator core structure according to claim 8, characterized in that: Both ends of the tooth unit are respectively provided with a clamping block and a clamping slot matching the clamping block.

10. The motor stator core structure according to claim 1, characterized in that: The tooth unit is in a straight line or an arc shape matched with the stator yoke in the length direction.

11. The motor stator core structure according to claim 1, characterized in that: When the stator yoke is a oriented silicon steel stator yoke, the stator yoke is formed by spirally winding and stacking a yoke oriented steel strip, and the orientation direction of the yoke oriented steel strip is its length direction.

Images