Spliced motor stator based on multiple soft magnetic materials and splicing method

Abstract

The invention relates to a spliced motor stator based on multiple soft magnetic materials and a splicing method, and belongs to the technical field of motor stators. Firstly, a stator yoke lamination, a tooth body lamination and a tooth top lamination are respectively cut on a base material, and connecting buckles and splicing groove structures are reserved on the stator yoke lamination, the tooth body lamination and the tooth top lamination; the stator yoke laminations, the tooth body laminations and the tooth top laminations are respectively laminated and molded, and then a plurality of modules are engaged and spliced; or the corresponding interface positions of the stator yoke laminations, the tooth body laminations and the tooth top laminations are welded and laminated to form a complete stator structure, the stator tooth body modules are made of cobalt-based soft magnetic materials, the stator yoke modules are made of silicon steel sheets, and the stator tooth top modules are made of high-silicon-content silicon steel sheets or silicon steel sheets. The motor stator tooth part saturation flux density is improved, the stator tooth body width is reduced, the slot area is increased, the tooth top iron loss and copper loss are reduced, the motor temperature rise is reduced, the motor electric load is improved, and the machining and manufacturing cost is considered.

Description

Technical Field

[0001] The present invention relates to a motor stator assembled with soft magnetic materials and an assembling method, belonging to the technical field of motor stators. Background Art

[0002] As a key device for the mutual conversion of electrical energy and mechanical energy, motors are widely used in many fields such as industrial production, transportation, and household appliances. Their performance directly affects the operating efficiency and energy consumption of various industries. As one of the core components of a motor, the stator has a decisive impact on the overall performance of the motor, and the soft magnetic materials used in it are of utmost importance.

[0003] Most traditional motor stators are made of a single soft magnetic material, such as silicon steel sheets. Silicon steel sheets have long dominated the selection of materials for motor stators due to their relatively stable magnetic properties, mature processing technology, and relatively low cost. In the application scenarios of power frequency 50Hz or 60Hz motors, silicon steel sheets can better meet the requirements. Because of their high magnetic permeability, they can promote the efficient concentration of magnetic lines of force, reduce magnetic leakage, and thus ensure the basic operating efficiency of the motor. At the same time, processing silicon steel into thin sheets and then laminating them can, to a certain extent, suppress eddy current losses.

[0004] However, with the rapid development of technology, the application scenarios of motors are becoming increasingly diverse and complex, posing more stringent requirements for motor performance. Under high-frequency operating conditions, many drawbacks are exposed in single-silicon-steel-sheet stators. When subjected to a high-frequency alternating magnetic field, the eddy current losses in silicon steel sheets increase exponentially with the increase in frequency, resulting in a sharp decline in motor efficiency and serious heating. For example, in the drive motors of some new energy vehicles, high-speed motors in aerospace equipment, and small high-frequency motors in precision electronic instruments, the operating frequency far exceeds the power frequency, and traditional silicon steel sheet stators are no longer suitable, severely restricting the improvement of the overall performance of the equipment. It also additionally increases the difficulty and cost of heat dissipation design and affects the compactness of the equipment.

[0005] In addition to silicon steel, there are also soft magnetic materials such as permalloys. Permalloys have extremely high initial magnetic permeability and excellent magnetization effects in weak magnetic fields, and can be used for motor stators in electromagnetic sensors with extremely high sensitivity requirements and weak signal detection equipment. However, they are costly and have poor corrosion resistance, so it is not economical and practical to use them extensively in ordinary motors. Ferrite soft magnetic materials have high resistivity and low eddy current losses at high frequencies, but their magnetic permeability is relatively low. When used in high-power motors, it is difficult to provide sufficient magnetic flux, resulting in insufficient motor torque and limited output.

[0006] The publication number is CN106921228B, and the invention is titled "A stator, a method for manufacturing a stator, and a permanent magnet brushless motor". It proposes to use a motor stator made of soft magnetic composite materials and laminated silicon steel materials, and to increase the magnetic flux path by using the three-dimensional magnetic circuit characteristics of the soft magnetic composite materials. However, the soft magnetic composite materials have problems such as low magnetic permeability, large hysteresis loss, and high iron loss within the normal working range of the motor, which to a certain extent affect the improvement of the power density and torque density of the motor.

[0007] The publication number is CN222215301U, and the name of the invention is a spliced ​​stator. It proposes to splice several adjacent fan-shaped stator core units into a complete stator core in a circular ring shape through the corresponding tenons and mortise grooves, thereby improving welding efficiency. The publication number is CN119154540A, and the name of the invention is a stator core, a plastic-encapsulated stator assembly, and a manufacturing method thereof, a motor, and an air conditioner. It proposes to use a lateral sliding limit structure to allow two semicircular core segments to be split and spliced ​​to form a full circle. After the two semicircular core segments are split and assembled, they can achieve more reliable limit in the axial and radial directions, improve the concentricity of the stator assembly, and help reduce the running noise of the motor; however, they all use a single material, and do not fully utilize the performance advantages of different materials to achieve both processing and manufacturing costs while reducing motor losses and improving motor operating efficiency.

[0008] The current manufacturing industry is moving towards high precision, high performance and miniaturization. Electronic products pursue lightweight and multifunctional integration, and industrial equipment emphasizes high efficiency and energy saving. The existing motor stators made of a single soft magnetic material cannot take into account the needs of different working conditions, and it is difficult to balance factors such as electromagnetic performance, cost, and processing convenience. Based on this, it is urgent to develop a technical solution that can combine the advantages of multiple soft magnetic materials and form a motor stator through clever splicing. It can not only accurately match the complex and changeable working frequency and magnetic field strength requirements, but also meet the development trend of reducing costs and increasing efficiency and optimizing equipment performance in various industries, filling the gap in the application of existing motor stator materials.

[0009] Therefore, it is urgent to propose a motor stator splicing method based on multiple soft magnetic materials to solve the above technical problems. Summary of the invention

[0010] In order to solve the above problems, a motor stator and a splicing method based on multiple soft magnetic materials are provided. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0011] The technical solution of the present invention:

[0012] Splicing method for the stator of an electric motor based on splicing of multiple soft magnetic materials. First, cut out stator yoke laminations, tooth body laminations, and tooth tip laminations on the base material respectively. Connection buckles (connection protrusions) are reserved on the stator yoke laminations, tooth body laminations, and tooth tip laminations.

[0013] And splicing grooves (connection grooves) are structured;

[0014] Stack and press the stator yoke laminations, tooth body laminations, and tooth tip laminations respectively to form a stator yoke module, a stator tooth body module, and a stator tooth tip module. Then, splice multiple modules meshingly and supplement with an adhesive to achieve firm connection to form a complete stator structure; or weld the corresponding interface positions of the stator yoke laminations, tooth body laminations, and tooth tip laminations to form a complete single-layer stator lamination, and then stack and press to stack out a complete stator structure.

[0015] Preferably: The stator tooth body module uses cobalt-based soft magnetic materials (soft magnetic materials with high saturation magnetic flux density), the stator yoke module uses conventional silicon steel sheets, and the stator tooth tip module uses silicon steel sheets with high silicon content (low-loss soft magnetic materials) or conventional silicon steel sheets.

[0016] For the stator of an electric motor spliced with multiple soft magnetic materials, a splicing method for the stator of an electric motor spliced with multiple soft magnetic materials is adopted, including a stator yoke module, a stator tooth body module, and a stator tooth tip module. The two sides of the stator tooth body module are respectively connected to the stator tooth tip module and the stator yoke module to form a stator unit, and several stator units are arranged in a circumferential array; The stator core is composed of multiple soft magnetic materials spliced together; The stator core is composed of multiple stator core modules spliced together; Each stator core module is composed of a stator yoke, a stator tooth body, and a stator tooth tip; The stator tooth body uses soft magnetic materials with high saturation magnetic flux density; The stator yoke can use conventional silicon steel sheets; The stator tooth tip can use low-loss soft magnetic materials or conventional silicon steel sheets; The stator structure proposed by the present invention can improve the utilization rate of soft magnetic materials with high saturation magnetic flux density and reduce costs; Using soft magnetic materials with high saturation magnetic flux density as the stator teeth is beneficial to reducing the tooth body width and increasing the slot area, thereby reducing the copper loss of the motor; Using low-loss soft magnetic materials for the stator tooth tip can reduce the iron loss; The present invention can effectively increase the torque density and power density of the motor while taking into account the material cost;

[0017] The stator yoke module includes stator yoke laminations, the stator tooth body module includes tooth body laminations, and the stator tooth tip module includes tooth tip laminations. The number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than or equal to one. When the number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than one, the stator yoke laminations are stacked axially, the tooth body laminations are stacked axially, and the tooth tip laminations are stacked axially;

[0018] The stator yoke laminations are the first stator yoke laminations, the stator tooth body modules are the first tooth body laminations, and the tooth tip laminations are the first tooth tip laminations; the inner and outer radial ends of the first tooth body laminations are respectively connected to the first tooth tip laminations and the first stator yoke laminations, and the center lines of the first stator yoke laminations, the first tooth body laminations, and the first tooth tip laminations coincide; a number of first tooth tip laminations form an inner ring, and there are gaps between adjacent first tooth tip laminations; a number of first stator yoke laminations form an outer ring; first connection buckles and first splicing grooves are respectively machined at the circumferential two ends of the first stator yoke laminations, the shapes of the first connection buckles and the first splicing grooves correspond to each other, the first connection buckle at one end of the first stator yoke lamination is connected to the first splicing groove at the other end of the adjacent first stator yoke lamination, and a number of first stator yoke laminations are sequentially connected circumferentially to form an outer ring type.

[0019] Preferably: a first connection groove is machined on the inner side in the radial direction of the first stator yoke lamination, second connection grooves and first connection protrusions are respectively machined at the inner and outer radial ends of the first tooth body lamination, a second connection protrusion is machined on the outer side in the radial direction of the first tooth tip lamination, the first connection protrusion and the first connection groove are correspondingly arranged and spliced to connect the first tooth body lamination and the first stator yoke lamination, and the second connection groove and the second connection protrusion are correspondingly arranged and spliced to connect the first tooth body lamination and the first tooth tip lamination.

[0020] Preferably: the first tooth body lamination is square or trapezoidal. When the first tooth body lamination is trapezoidal, the hypotenuse edges of adjacent trapezoids are arranged in parallel, and the outer end faces in the radial direction of the first stator yoke lamination and the first tooth body lamination are arc-shaped or flat.

[0021] Preferably: the inner side surface of the first stator yoke lamination and the outer side surface of the first tooth body lamination are welded to form a first interface, and the inner side surface of the first tooth body lamination stack and the outer side surface of the first tooth tip lamination are welded to form a second interface. The welding can adopt full splicing, full welding or a combination of splicing and welding.

[0022] Based on a motor stator spliced with a variety of soft magnetic materials, using a splicing method for a motor stator spliced with a variety of soft magnetic materials, the stator yoke laminations are the second stator yoke laminations, the stator tooth body modules are the second tooth body laminations, and the tooth tip laminations are the second tooth tip laminations; the inner side in the radial direction of the second tooth body lamination is connected to the second tooth tip lamination, and the center lines of the connection between the inner side in the radial direction of the second tooth body lamination and the second tooth tip lamination coincide; the number of the second tooth body laminations is the same as that of the second stator yoke laminations, and the second tooth body laminations and the second stator yoke laminations are arranged alternately in the circumferential direction.

[0023] Preferably: Third connection protrusions and third connection grooves are respectively machined on two circumferential side surfaces at the radially outer end of the second tooth body lamination; fourth connection protrusions and fourth connection grooves are respectively machined on two circumferential side surfaces of the second stator yoke lamination; the third connection protrusions and the fourth connection grooves are correspondingly arranged and fitted together, and the third connection grooves and the fourth connection protrusions are correspondingly arranged and fitted together, so that the alternately arranged second tooth body laminations and second stator yoke laminations are sequentially connected.

[0024] Preferably: The radially outer end faces of the second tooth body lamination and the second stator yoke lamination are arc surfaces or flat surfaces; the second tooth body lamination is square or trapezoidal; a fifth connection groove is machined on the radially inner end face of the second tooth body lamination, and a fifth connection protrusion is machined on the radially outer end face of the second tooth top lamination; the fifth connection groove and the fifth connection protrusion are correspondingly arranged and fitted together, so that the second tooth body lamination and the second tooth top lamination are connected.

[0025] Preferably: The two circumferential sides of the second tooth body lamination are respectively welded to the second stator yoke lamination to form a third interface and a fourth interface, and the welding can adopt full splicing, full welding or a combination of splicing and welding.

[0026] The present invention has the following beneficial effects:

[0027] The stator structure proposed by the present invention can improve the utilization rate of cobalt-based soft magnetic materials and reduce costs; using cobalt-based soft magnetic materials as stator teeth is beneficial to reducing the tooth body width and increasing the slot area, thereby reducing the copper loss of the motor; using silicon steel sheets with a high silicon content for the stator tooth top can reduce the iron loss; the present invention can effectively increase the torque density and power density of the motor while taking into account the material cost. Description of the Drawings

[0028] Figure 1 Schematic diagram of a stator with yoke splicing, tooth part welding, and parallel teeth stacking;

[0029] Figure 2 Schematic diagram of lamination of a stator module with yoke splicing, tooth part welding, and parallel teeth;

[0030] Figure 3 Schematic diagram of a stator module with yoke splicing, tooth part welding, and parallel teeth stacking;

[0031] Figure 4 Schematic diagram of a stator with yoke splicing, tooth part welding, and parallel slots stacking;

[0032] Figure 5 Schematic diagram of lamination of a stator module with yoke splicing, tooth part welding, and parallel slots;

[0033] Figure 6 Schematic diagram of a stator module with yoke splicing, tooth part welding, and parallel slots stacking;

[0034] Figure 7 Schematic diagram of the splicing method of a fully spliced parallel tooth stacked stator;

[0035] Figure 8 Schematic diagram of a fully welded extended parallel tooth stacked stator;

[0036] Figure 9 Schematic diagram of a fully welded extended parallel tooth stator lamination;

[0037] Figure 10 Schematic diagram of a stator lamination with a yoke splicing and tooth welding extended parallel tooth;

[0038] Figure 11 Schematic diagram of a fully spliced extended parallel tooth stator lamination;

[0039] Figure 12 Schematic diagram of a fully welded extended parallel tooth trapezoidal segmented yoke stacked stator;

[0040] Figure 13 Schematic diagram of a fully welded extended parallel tooth trapezoidal segmented yoke stator lamination;

[0041] Figure 14 Schematic diagram of a fully welded parallel slot extended tooth rectangular segmented yoke stacked stator;

[0042] Figure 15 Schematic diagram of a fully welded parallel slot extended tooth rectangular segmented yoke stator lamination;

[0043] Figure 16 Schematic diagram of a stator lamination with a yoke splicing and tooth welding parallel slot extended tooth;

[0044] Figure 17 Schematic diagram of a fully spliced parallel slot extended tooth stator lamination;

[0045] Figure 18 Schematic diagram of a rectangular stator tooth body lamination cutting;

[0046] Figure 19 Schematic diagram of a trapezoidal stator tooth body lamination cutting;

[0047] Figure 20 Schematic diagram of a stator tooth body lamination cutting for full splicing;

[0048] Figure 21 Schematic diagram of a lengthened rectangular stator tooth body lamination cutting for yoke splicing and tooth welding;

[0049] Figure 22 Schematic diagram of a lengthened trapezoidal stator tooth body lamination cutting for yoke splicing and tooth welding;

[0050] Figure 23 Schematic diagram of a lengthened trapezoidal stator tooth body lamination cutting for yoke splicing and tooth welding after improvement.

[0051] In the figure: 1 - First stator yoke lamination, 2 - First tooth body lamination, 3 - First tooth tip lamination, 4 - First interface, 5 - Second interface, 6 - First connecting buckle, 7 - First splicing groove, 101 - First connecting groove, 201 - First connecting protrusion, 202 - Second connecting groove, 301 - Second connecting protrusion, 11 - Second stator yoke lamination, 12 - Second tooth body lamination, 13 - Second tooth tip lamination, 16 - Third connecting protrusion, 17 - Third connecting groove, 18 - Fourth connecting protrusion, 19 - Fourth connecting groove, 121 - Fifth connecting groove, 131 - Fifth connecting protrusion. Detailed implementation mode

[0052] To make the objectives, technical solutions and advantages of the present invention clearer and more explicit, the present invention will be described below through specific embodiments shown in the attached drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0053] Detailed implementation mode one: In combination with Figure 1-23 To illustrate this implementation mode, the splicing method of the motor stator spliced with multiple soft magnetic materials in this implementation mode first cuts out the stator yoke lamination, tooth body lamination, and tooth tip lamination on the base material respectively. Connection buckles (connecting protrusions) and splicing grooves (connecting grooves) are reserved on the stator yoke lamination, tooth body lamination, and tooth tip lamination; the stator tooth body module is first cut from a high saturation magnetic density soft magnetic material and then formed by lamination and fastening. Utilizing its high saturation magnetic density characteristics, when keeping the magnetic flux flowing through the stator teeth unchanged, the width of the tooth body can be designed to be smaller, so that the slot area increases, effectively reducing the copper loss of the motor, helping to increase the electric load of the motor, and thus increasing the power density and torque density of the motor;

[0054] The stator yoke lamination, tooth body lamination, and tooth tip lamination are respectively laminated and formed to form a stator yoke module, a stator tooth body module, and a stator tooth tip module. Then, multiple modules are meshed and spliced, and an adhesive is used to achieve fastening connection to form a complete stator structure; or the corresponding interface positions of the stator yoke lamination, tooth body lamination, and tooth tip lamination are welded to form a complete single-layer stator lamination, and then laminated and formed to stack out a complete stator structure; it is applicable to both the stator with parallel teeth structure and the stator with parallel slot structure; it is applicable to both integral slots and fractional slots, is easy to operate, and has good applicability.

[0055] Detailed implementation mode two: In combination with Figure 1-7To describe this embodiment, the motor stator based on the splicing of multiple soft magnetic materials in this embodiment includes a stator yoke module, a stator tooth body module, and a stator tooth tip module. The two sides of the stator tooth body module are respectively connected to the stator tooth tip module and the stator yoke module to form a stator unit. A number of stator units are arranged in a circumferential array. The stator yoke module, the stator tooth body module, and the stator tooth tip module are initially formed by meshing, bonding, or welding. The stator tooth body modules are sequentially and equally spaced along the circumferential direction and spliced on the stator yoke module. Each stator tooth body module has the same size, and its axial length is equal to the axial length of the stator core yoke. The stator tooth body modules are sequentially and equally spaced along the circumferential direction and rotated and extended along a fixed direction and spliced on the complete stator core yoke, so that the difference between two adjacent stator tooth body modules is 360 / Q degrees, where Q is the number of slots of the motor stator. By using the modular stator assembly for assembly, the problem of difficult winding insertion is solved. The motor winding can be pre-wound on the assembled stator tooth module and then spliced on the stator yoke module, which improves the slot fill factor of the motor. Moreover, the design of a smaller slot opening width is beneficial to reducing the cogging torque and torque ripple of the motor.

[0056] The stator tooth body module uses cobalt-based soft magnetic materials (soft magnetic materials with high saturation magnetic density), the stator yoke module uses conventional silicon steel sheets, and the stator tooth tip module uses silicon steel sheets with a high silicon content (low-loss soft magnetic materials) or conventional silicon steel sheets. The stator structure proposed by the present invention can improve the utilization rate of cobalt-based soft magnetic materials and reduce costs. Using cobalt-based soft magnetic materials as stator teeth is beneficial to reducing the tooth body width and increasing the slot area, thereby reducing the copper loss of the motor. Using silicon steel sheets with a high silicon content for the stator tooth tip can reduce the iron loss.

[0057] The stator yoke module includes stator yoke laminations, the stator tooth body module includes tooth body laminations, and the stator tooth tip module includes tooth tip laminations. The number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than or equal to one. When the number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than one, the stator yoke laminations are stacked axially, the tooth body laminations are stacked axially, and the tooth tip laminations are stacked axially. The stator yoke laminations, tooth body laminations, and tooth tip laminations are all made of soft magnetic materials. The stator yoke module is cut and laminated from non-oriented electrical steel sheets; the stator tooth body module is cut and laminated from soft magnetic materials with high saturation magnetic density; the stator tooth tip module is cut and laminated from low-loss soft magnetic materials or conventional silicon steel sheets; the stator yoke module is first cut from conventional silicon steel sheets and then laminated and fastened. Compared with soft magnetic materials, its cost is lower and the processing and manufacturing are more convenient. The stator tooth body is made of soft magnetic materials with high saturation magnetic density. Using its high saturation magnetic density characteristics, the width of the tooth body can be designed smaller while keeping the magnetic flux flowing through the stator tooth unchanged, increasing the slot area, effectively reducing the copper loss of the motor, improving the electrical load of the motor, and increasing the torque density and power density of the motor; the stator tooth tip can be made of low-loss soft magnetic materials or conventional silicon steel sheets. Using low-loss soft magnetic materials for the stator tooth tip can reduce iron loss and thus reduce the temperature rise of the motor; the stator yoke lamination is the first stator yoke lamination 1, the stator tooth body module is the first tooth body lamination 2, and the tooth tip lamination is the first tooth tip lamination 3; the inner and outer radial ends of the first tooth body lamination 2 are respectively connected to the first tooth tip lamination 3 and the first stator yoke lamination 1. The center lines of the first stator yoke lamination 1, the first tooth body lamination 2, and the first tooth tip lamination 3 coincide. A number of first tooth tip laminations 3 form an inner ring, and there are gaps between adjacent first tooth tip laminations 3. A number of first stator yoke laminations 1 form an outer ring; first connection buckles 6 and first splicing grooves 7 are respectively processed at the circumferential two ends of the first stator yoke lamination 1. The shapes of the first connection buckles 6 and the first splicing grooves 7 correspond to each other. The first connection buckle 6 at one end of the first stator yoke lamination 1 is connected to the first splicing groove 7 at the other end of the adjacent first stator yoke lamination 1. A number of first stator yoke laminations 1 are sequentially connected circumferentially to form an outer ring type;

[0058] Except for the connection buckle and splicing groove structures, the other sides are flat. The inner side is close to the slot space for placing the motor winding, and its arc length is less than the arc length of the outer side, which can be used for splicing with the stator tooth module;

[0059] A first connection groove 101 is processed on the radial inner side of the first stator yoke lamination 1. Second connection grooves 202 and first connection protrusions 201 are respectively processed at the inner and outer radial ends of the first tooth body lamination 2. A second connection protrusion 301 is processed on the radial outer side of the first tooth tip lamination 3. The first connection protrusion 201 corresponds to the first connection groove 101 and is spliced in cooperation to connect the first tooth body lamination 2 and the first stator yoke lamination 1. The second connection groove 202 corresponds to the second connection protrusion 301 and is spliced in cooperation to connect the first tooth body lamination 2 and the first tooth tip lamination 3;

[0060] The first tooth body lamination 2 is square or trapezoidal. When the first tooth body lamination 2 is trapezoidal, the hypotenuses of adjacent trapezoids are arranged in parallel. The radially outer end faces of the first stator yoke lamination 1 and the first tooth body lamination 2 are arc-shaped or flat.

[0061] Specific Embodiment 3: In combination with Figure 8-17 This embodiment is described. The motor stator based on splicing of multiple soft magnetic materials in this embodiment includes a stator yoke module, a stator tooth body module, and a stator tooth tip module. The two sides of the stator tooth body module are respectively connected to the stator tooth tip module and the stator yoke module to form a stator unit. A number of stator units are arranged in a circumferential array. The stator yoke module, the stator tooth body module, and the stator tooth tip module are initially formed by meshing, bonding, or welding. The stator tooth body modules are sequentially and equidistantly extended and spliced on the stator yoke module along the circumferential direction. Each stator tooth body module has the same size, and its axial length is equal to the axial length of the stator core yoke. The stator tooth body modules are sequentially and equidistantly rotated and extended along a fixed direction and spliced on the complete stator core yoke, so that the adjacent two stator tooth body modules differ by 360 / Q degrees, where Q is the number of slots of the motor stator. The use of a modular stator assembly for assembly solves the problem of difficult winding insertion. The motor winding can be pre-wound on the assembled stator tooth module and then spliced on the stator yoke module, improving the slot fill factor of the motor. And the design of a smaller slot width is beneficial to reducing the cogging torque and torque ripple of the motor.

[0062] The stator yoke module includes stator yoke laminations, the stator tooth body module includes tooth body laminations, and the stator tooth tip module includes tooth tip laminations. The number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than or equal to one. When the number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than one, the stator yoke laminations are stacked axially, the tooth body laminations are stacked axially, and the tooth tip laminations are stacked axially. The stator yoke laminations, tooth body laminations, and tooth tip laminations are all made of soft magnetic materials. The stator yoke module is cut and laminated from non-oriented electrical steel sheets; the stator tooth body module is cut and laminated from soft magnetic materials with a high saturation magnetic density; the stator tooth tip module is cut and laminated from low-loss soft magnetic materials or conventional silicon steel sheets. The stator yoke module is first cut from conventional silicon steel sheets and then laminated and fastened, which has a lower cost and is more convenient for processing and manufacturing compared to soft magnetic materials. The stator tooth body is made of soft magnetic materials with a high saturation magnetic density, that is, the stator tooth body is made of cobalt-based soft magnetic materials. The saturation magnetic induction intensity of cobalt-based materials (usually above 2.0 T) is higher than that of many other soft magnetic materials (such as ferrites and permalloys). Using its high saturation magnetic density characteristics, when the magnetic flux flowing through the stator teeth remains unchanged, the width of the tooth body can be designed to be smaller, increasing the slot area, effectively reducing the copper loss of the motor, improving the electric loading of the motor, and increasing the torque density and power density of the motor; the stator tooth tip module can be first cut from low-loss soft magnetic materials or conventional silicon steel sheets and then laminated and fastened, that is, the stator tooth tip can use high-silicon-content silicon steel sheets (the silicon content is usually 6.(about 5%) or conventional silicon steel sheets (usually with a silicon content of about 3%). The main advantages brought by high-silicon-content silicon steel include an increase in resistivity, which reduces eddy current losses, especially in high-frequency applications. In addition, high-silicon-content silicon steel has the characteristics of high magnetic permeability and low coercivity, which can improve the magnetization efficiency of the motor. The magnetic hysteresis loop is narrower, resulting in a further reduction in magnetic hysteresis losses. Finally, by reducing magnetic hysteresis losses and eddy current losses, the iron loss and temperature rise of the motor are reduced. Therefore, the material selection of the present invention solves the problem of high losses at the top of the stator teeth. Applying a low-loss soft magnetic material to the top of the stator teeth can effectively reduce the iron loss at the top of the stator teeth and lower the temperature rise of the motor. The motor stator yoke module is formed by cutting conventional silicon steel sheets first and then stacking and fastening them. Compared with using high-performance soft magnetic materials, its eddy current losses will not increase significantly, and the cost is reduced without affecting the performance of the motor. The creative combination application of multiple materials optimizes the material of the stator yoke module and reduces the cost without affecting the performance of the motor. The material selection of the stator tooth body module increases the slot area, reduces copper losses, and improves the electric load of the motor. After optimization, the torque and power density of the motor increase, improving the performance and power output of the motor. Further, the present invention increases the slot area through material selection. Under the technical means of material selection and slot area optimization, the material of the tooth top is optimized again. Utilizing its high resistivity characteristics, it not only reduces eddy current losses but also has high magnetic permeability and low coercivity, improving the magnetization efficiency and reducing losses. Through comprehensive consideration of multiple steps, the present invention synchronizes the material selection process with the structural improvement and optimization, making the two complement each other, achieving the effect of effectively increasing the torque density and power density of the motor while taking into account the material cost of the present invention.

[0063] Except for the connection protrusion and connection groove structures, the remaining sides are flat. The inner side is close to the slot space for placing the motor winding, and its arc length is less than the arc length of the outer side, and it can be used for splicing with the stator tooth module;

[0064] The stator yoke lamination is the second stator yoke lamination 11, the stator tooth body module is the second tooth body lamination 12, and the tooth top lamination is the second tooth top lamination 13; the radial inner side of the second tooth body lamination 12 is connected to the second tooth top lamination 13, and the center line of the connection between the radial inner side of the second tooth body lamination 12 and the second tooth top lamination 13 is set to coincide. The number of the second tooth body laminations 12 is the same as that of the second stator yoke laminations 11, and the second tooth body laminations 12 and the second stator yoke laminations 11 are arranged alternately in the circumferential direction to form a ring. The side surfaces of the connection parts of adjacent second tooth body laminations 12 and second stator yoke laminations 11 are in contact. A number of second tooth top laminations 13 form an inner ring, and there are gaps between adjacent second tooth top laminations 13;

[0065] On two circumferential sides of the radially outer end of the second tooth body lamination 12, a third connecting protrusion 16 and a third connecting groove 17 are respectively machined. On two circumferential sides of the second stator yoke lamination 11, a fourth connecting protrusion 18 and a fourth connecting groove 19 are respectively machined. The third connecting protrusion 16 and the fourth connecting groove 19 are correspondingly arranged and spliced, and the third connecting groove 17 and the fourth connecting groove 19 are correspondingly arranged and spliced, so that the alternately arranged second tooth body laminations 12 and second stator yoke laminations 11 are sequentially connected;

[0066] The radially outer end faces of the second tooth body lamination 12 and the second stator yoke lamination 11 are arc surfaces or flat surfaces; both the inner and outer side surfaces of the stator core yoke are curved surfaces or flat surfaces, and the remaining side surfaces are flat surfaces. The inner side surface is close to the slot space for placing the motor winding. The arc length of the inner side surface is less than that of the outer side surface. The inner side surface can be used for splicing with the modular stator teeth, and at the same time, reasonable cutting and arrangement can save materials; the second tooth body lamination 12 is square or trapezoidal, and the second stator yoke lamination 11 is a corresponding trapezoid or square, so that the side surfaces are fitted. When the second tooth body lamination 2 is trapezoidal, the hypotenuses of adjacent trapezoids are arranged in parallel; a fifth connecting groove 121 is machined on the radially inner end face of the second tooth body lamination 12, and a fifth connecting protrusion 131 is machined on the radially outer end face of the second tooth top lamination 13. The fifth connecting groove 121 and the fifth connecting protrusion 131 are correspondingly arranged and spliced, so that the second tooth body lamination 12 and the second tooth top lamination 13 are connected; the present invention can effectively improve the saturation magnetic density of the motor stator teeth, reduce the width of the stator tooth body, increase the slot area, reduce the tooth top iron loss and copper loss, reduce the motor temperature rise, help to increase the electric load of the motor, thereby increasing the torque density and power density of the motor, and at the same time taking into account the manufacturing cost.

[0067] Embodiment 1:

[0068] Combined with attached Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 18 、 Figure 19 It is described as follows; first, by cutting the base material, nQ stator yoke module laminations (stator yoke laminations), stator tooth body module laminations (tooth body laminations) and stator tooth top module laminations (tooth top laminations) are respectively machined, where Q is the number of motor stator slots and n is the number of stator stacking layers; Figure 18 and Figure 19Schematic diagram of cutting the first tooth body lamination 2 on the base material. For motors with a parallel tooth structure, the processed first tooth body laminations 2 are all rectangular; for motors with a parallel slot structure, the processed first tooth body laminations 2 are all isosceles trapezoids. Since the stator tooth body module uses a high-saturation magnetic density soft magnetic material with a relatively high price, in order to save costs, a technical solution with straight cutting lines is adopted, avoiding material waste caused by arc cutting. In order to make full use of the base material, the rectangular or trapezoidal first tooth body laminations 2 are respectively arranged in longitudinal and transverse arrays and closely fit. The adjacent two trapezoidal first tooth body laminations 2 in the transverse direction are arranged with a 180-degree flip to maximize the use of materials. From Figure 18 and Figure 19 it can be seen that except for the peripheral areas on both sides of the base material, the base material in other positions is fully utilized. In addition, the first stator yoke lamination 1 is processed by cutting a conventional silicon steel sheet base material, and the first tooth tip lamination 3 is processed by cutting a conventional silicon steel sheet base material or a low-loss soft magnetic material sheet base material. Among them, the outer side profile of the first stator yoke lamination 1 is arc-shaped, the position in the middle of the inner side for docking the first tooth body lamination 2 is flat, and the two sides of the inner side are curved surfaces. A first splicing groove 7 is opened on the left side of the first stator yoke lamination 1, and a first connecting buckle 6 is opened on the right side, which is used for splicing with the first stator yoke laminations 1 or stator yoke modules on the left and right sides. The profiles of the connecting buckle and the splicing groove are both 270-degree arcs, and there are equidistant straight line segments on both the upper and lower sides for connecting the inner side and the outer side of the stator yoke module laminations, thereby forming a complete closed structure. The upper side profile of the first tooth tip lamination 3 is a straight line, which is used for docking with the stator tooth body module lamination on the upper side. The inner side profile is an arc, and the center of the arc coincides with the geometric center point of the motor. The rest of the profile lines are all straight lines, and the structure is symmetric about the left and right. After processing, the inner side of the first stator yoke lamination 1 is welded to the outer side of the first tooth body lamination 2 to form a first interface 4, and the inner side of the first tooth body lamination 2 is welded to the outer side of the first tooth tip lamination 3 to form a second interface 5, obtaining nQ complete stator module laminations. The processed stator module laminations are divided into Q groups, with n in each group, and are respectively stacked to form Q stator modules (stator units), and each stator module is stacked by n stator module laminations. After stacking, the first splicing groove 7 and the first connecting buckle 6 on the stator yoke module are used to splice the Q stator modules circumferentially in pairs to obtain a complete stator structure. The stator modules are evenly distributed circumferentially, and the adjacent two stator modules differ by 360 / Q degrees. The slot structure 8 is located between any two adjacent stator tooth modules, where Q is the number of stator slots of the motor, and the welding can be full splicing, full welding or a combination of splicing and welding.

[0069] Embodiment 2:

[0070] Combined with the attached Figure 7 and Figure 20A description is given; similar to Embodiment 1, the difference is that a full-splicing assembly method is adopted. First, the first stator yoke lamination 1, the first tooth body lamination 2, and the first tooth tip lamination 3 are cut out, and then they are stacked respectively to obtain the stator yoke module, the stator tooth body module, and the stator tooth tip module. Finally, they are spliced and assembled to obtain a complete motor stator. When cutting the base material to manufacture the laminations, a 270-degree arc first connection groove 101 and a first connection protrusion 201 are respectively cut out at the center of the inner side of the first stator yoke lamination 1 and the center of the inner side of the first tooth body lamination 2. A 270-degree arc second connection groove 202 and a second connection protrusion 301 are respectively reserved at the center of the outer side of the first tooth body lamination 2 and the center of the outer side of the first tooth tip lamination 3, so that the splicing groove on the inner side of the first stator yoke lamination 1 at the first interface 4 meshes and splices with the connection buckle on the outer side of the stator tooth body module lamination 2; at the second interface 5, the splicing groove on the inner side of the stator tooth body module lamination 2 meshes and splices with the connection buckle on the outer side of the stator tooth tip module lamination 3. After the first stator yoke lamination 1, the first tooth body lamination 2, and the first tooth tip lamination 3 are manufactured, they are stacked respectively to form a plurality of stator yoke modules, stator tooth body modules, and stator tooth tip modules. Finally, the modules are spliced to obtain a complete motor stator structure. Figure 20 FIG. is a schematic diagram of cutting the first tooth body lamination 2. Since the stator tooth body part uses a high-saturation magnetic density soft magnetic material with a relatively high price, in order to save costs, except for the connection buckle and the splicing groove that need to be cut in an arc, the remaining sides all adopt a straight cutting technical solution, which is similar to the stator tooth body lamination cutting and processing solution in Embodiment 1. For a motor with a parallel tooth structure, the processed tooth body laminations are all rectangular; for a motor with a parallel slot structure, the processed tooth body laminations are all isosceles trapezoids, avoiding material waste caused by arc cutting. For this embodiment, Figure 20 The shown cutting scheme can improve the utilization rate of the base material. Except for the ineffective utilization of the peripheral area of the base material, the internal base material is fully utilized.

[0071] Embodiment 3:

[0072] Combined with the attached Figure 8 、 Figure 9 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 18 、 Figure 19A description is given; it is applicable to the lengthened stator tooth body structure, and the traditional yoke splicing evolves into yoke-tooth-yoke welding; in Embodiments 1-2, the first interface 4 originally for the inner side of the yoke module and the outer side of the tooth part evolves into the third interface 4-1 where the left side of the tooth part is connected to the right side of a yoke module and the fourth interface 4-2 where the right side of the tooth part is connected to the left side of another yoke module. Among them, the third interface 4-1 is located at the upper left end of the second tooth body lamination 12, and the fourth interface 4-2 is located at the upper right end of the second tooth body lamination 12; First, cut out nQ second stator yoke laminations 11, second tooth body laminations 12, and second tooth tip laminations 13 on the base material respectively, where Q is the number of motor stator slots and n is the stacking layer number; Secondly, divide the nQ second stator yoke laminations 11, second tooth body laminations 12, and second tooth tip laminations 13 into n groups, each group having Q second stator yoke laminations 11, second tooth body laminations 12, and second tooth tip laminations 13. Weld each group of second tooth body laminations 12 and second tooth tip laminations 13 pairwise at the second interface 5 to form a total of n groups of Q complete stator tooth module laminations. Then, alternately weld the Q complete stator tooth module laminations in each group and the Q second stator yoke laminations 11 along the circumference to form n groups of Q third interfaces 4-1 and n groups of Q fourth interfaces 4-2. After welding, n complete stator yoke laminations are formed; Finally, stack the n stator yoke laminations axially to obtain a complete stator structure; For motors with a parallel tooth structure, the processed tooth body laminations are all rectangular; For motors with a parallel slot structure, the processed tooth body laminations are all isosceles trapezoids. In addition to the stator tooth body module lamination cutting scheme for saving high saturation magnetic density soft magnetic materials described in Embodiment 1, in order to further improve the utilization rate of the silicon steel base material, the inner and outer sides of the traditional stator yoke module laminations can be improved from curved surfaces to flat surfaces, that is, for motors with a parallel tooth structure, the processed yoke module laminations are all isosceles trapezoids; For motors with a parallel slot structure, the processed yoke module laminations are all rectangular, and the welding can adopt full splicing, full welding, or a combination of splicing and welding.

[0073] Embodiment 4:

[0074] Combined with the attached Figure 10 , Figure 16 , Figure 21 , Figure 22 , Figure 23Description is made; similar to Embodiment 3, this embodiment is applicable to an elongated tooth body structure, and the traditional yoke splicing evolves into yoke-tooth-yoke splicing. The difference from Embodiment 3 is that at the third interface 4-1 and the fourth interface 4-2, welding is changed to the meshing splicing of a connecting buckle and a splicing groove; when cutting the base material to manufacture laminations, a 270-degree arc splicing groove is opened at the upper left end of each second tooth body lamination 12, and a 270-degree arc connecting buckle is reserved at the upper right end, so that the third connecting groove 17 on the upper left side of the stator second tooth body lamination 12 at the third interface 4-1 and the fourth connecting protrusion 18 on the right side of the left stator yoke module lamination (the second stator yoke lamination 11) are meshed and spliced; at the fourth interface 4-2, the connecting buckle third connecting protrusion 16 on the upper right side of the stator tooth body module lamination (the second tooth body lamination 12) and the splicing groove (the fourth connecting groove 19) on the left side of the right stator yoke module lamination are meshed and spliced; First, nQ second stator yoke laminations 11, second tooth body laminations 12, and second tooth tip laminations 13 are respectively cut out on the base material, where Q is the number of motor stator slots and n is the stacking layer number; Secondly, the nQ second tooth body laminations 12 and second tooth tip laminations 13 are evenly divided into n groups, each group having Q stator tooth body module laminations (second tooth body laminations 12) and stator tooth tip module laminations (second tooth tip laminations 13). The stator tooth body module laminations and the stator tooth tip module laminations in each group are welded pairwise at the second interface 5 to form n groups of Q complete stator tooth module laminations, and then the stator tooth module laminations are stacked to obtain Q stator tooth modules, each stator tooth module being stacked by n stator tooth module laminations; The nQ stator yoke module laminations 1 are evenly divided into Q groups, each group having n stator yoke module laminations 1, and are respectively stacked to obtain Q stator yoke modules, each stator yoke module being axially stacked by n second stator yoke laminations 11; Finally, the Q complete stator tooth modules and the Q stator yoke modules are alternately meshed and spliced circumferentially to obtain a complete motor stator; From Figure 21 It can be seen that for a motor with a parallel tooth structure, the utilization rate of the base material is relatively high, and only the right side of the base material is not fully utilized; From Figure 22 It can be seen that for a motor with a parallel slot structure, due to the connecting buckle and splicing groove structures provided on the left and right sides of the stator tooth body, in the cutting process, in addition to the materials in the peripheral area of the base material not being fully utilized, there is also material waste in the left and right junction areas of different stator tooth bodies; more materials are wasted at the junction of the connecting buckles of different stator tooth bodies than at the junction of the splicing grooves. Based on this, for this embodiment, Figure 23The stator tooth body structure shown, that is, for a parallel slot structure motor, both the left and right sides of the stator tooth body adopt a spliced slot structure, and the stator yoke module adopts a structure with connecting buckles on both the left and right sides, avoiding the problem of low utilization rate of the base material of the high saturation magnetic density soft magnetic material at the junction area of the connecting buckles of different trapezoidal stator tooth bodies during the cutting process, improving the utilization rate of the relatively expensive soft magnetic material, thereby reducing the overall processing and manufacturing cost. The welding can adopt full splicing, full welding or a combination of splicing and welding.

[0075] Embodiment 5:

[0076] Combined with the attached Figure 11 、 Figure 17 、 Figure 21 、 Figure 22 、 Figure 23 Explanation is given; similar to Embodiment 4, the difference is that a full splicing assembly method is adopted, that is, except that at the third interface 4-1 and the fourth interface 4-2, the welding is changed to the meshing splicing of the connecting buckle and the spliced slot, and at the second interface 5, the welding is also changed to the meshing splicing of the connecting buckle and the spliced slot. The technical solution is to first cut out the second stator yoke laminations 11, the second tooth body laminations 12 and the second tooth top laminations 13, respectively stack them to obtain the stator yoke module, the stator tooth body module and the stator tooth top module, and finally perform splicing and assembly to obtain a complete motor stator; when manufacturing the laminations by cutting the base material, a 270-degree arc spliced slot (the fourth connecting slot 19, the third connecting slot 17, the fifth connecting slot 121) is respectively reserved at the left side surface of the second stator yoke lamination 11, the upper end of the left side surface of the second tooth body lamination 12 and the center of the inner side surface of the second tooth body lamination 12, and a 270-degree arc connecting buckle (the fourth connecting protrusion 18, the third connecting protrusion 16, the fifth connecting protrusion 131) is respectively reserved at the right side surface of the second stator yoke lamination 11, the upper end of the right side surface of the second tooth body lamination 12 and the center of the outer side surface of the second tooth top lamination 13, so that the spliced slot on the inner side surface of the second tooth body lamination 12 at the second interface 5 meshes and splices with the connecting buckle on the outer side surface of the second tooth top lamination 13; at the third interface 4-1, the spliced slot at the upper end of the left side surface of the second tooth body lamination 12 meshes and splices with the connecting buckle on the right side surface of the left second stator yoke lamination 11; at the fourth interface 4-2, the connecting buckle at the upper end of the right side surface of the second tooth body lamination 12 meshes and splices with the spliced slot on the left side surface of the right stator yoke module lamination. After the stator yoke module laminations (the second stator yoke laminations 11), the stator tooth body module laminations (the second tooth body laminations 12) and the stator tooth top module laminations (the second tooth top laminations 13) are cut and processed, they are respectively stacked to form a plurality of stator yoke modules, stator tooth body modules and stator tooth top modules, and finally the modules are spliced to obtain a complete motor stator structure; in addition, in order to improve the utilization rate of the base material of the high saturation magnetic density soft magnetic material during the cutting process, it can be at Figure 21 、 Figure 22 、 Figure 23On the basis of the cutting process plan, a splicing groove structure is further cut at the center of the inner side of the stator tooth body to obtain the stator tooth body structure of this embodiment.

[0077] It should be noted that the schematic diagram of the overall stator structure after splicing is the stator structure of a 12-slot motor, but this does not mean that this invention is only applicable to 12-slot motors. In fact, motors with any number of slots are applicable to the spliced stator structure proposed by this invention. Due to space limitations, they will not be listed one by one.

[0078] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutations and combinations. Therefore, this invention will no longer describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by this invention.

[0079] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A splicing method for a motor stator spliced with multiple soft magnetic materials, characterized in that: First, cut out stator yoke laminations, tooth body laminations, and tooth tip laminations on the base material respectively. Connection buckles and splicing grooves are reserved on the stator yoke laminations, tooth body laminations, and tooth tip laminations. Stack and press the stator yoke laminations, tooth body laminations, and tooth tip laminations respectively to form a stator yoke module, a stator tooth body module, and a stator tooth tip module. Then, engage and splice multiple modules, and supplement with an adhesive to achieve a firm connection to form a complete stator structure; or weld the corresponding interface positions of the stator yoke laminations, tooth body laminations, and tooth tip laminations to form a complete single-layer stator lamination, and then stack and press it to stack out a complete stator structure.

2. The splicing method of the motor stator spliced based on multiple soft magnetic materials according to claim 1, characterized in that: The stator tooth body uses a cobalt-based soft magnetic material, the stator yoke uses silicon steel sheets, and the stator tooth tip uses silicon steel sheets with a high silicon content or silicon steel sheets.

3. The motor stator is based on the splicing of multiple soft magnetic materials, and is characterized in that: Adopt the splicing method of the motor stator spliced based on multiple soft magnetic materials in claim 2, including a stator yoke module, a stator tooth body module, and a stator tooth tip module. The two sides of the stator tooth body module are respectively connected to the stator tooth tip module and the stator yoke module to form a stator unit, and several stator units are arranged in a circumferential array. The stator yoke module includes stator yoke laminations, the stator tooth body module includes tooth body laminations, and the stator tooth tip module includes tooth tip laminations. The number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than or equal to one. When the number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than one, the stator yoke laminations are stacked, the tooth body laminations are stacked, and the tooth tip laminations are stacked. The stator yoke lamination is the first stator yoke lamination (1), the stator tooth body module is the first tooth body lamination (2), and the tooth tip lamination is the first tooth tip lamination (3); the inner and outer radial ends of the first tooth body lamination (2) are respectively connected to the first tooth tip lamination (3) and the first stator yoke lamination (1); first connection buckles (6) and first splicing grooves (7) are respectively processed at the circumferential two ends of the first stator yoke lamination (1). The shapes of the first connection buckles (6) and the first splicing grooves (7) are correspondingly arranged. The first connection buckle (6) at one end of the first stator yoke lamination (1) is connected to the first splicing groove (7) at the other end of the adjacent first stator yoke lamination (1), and several first stator yoke laminations (1) are sequentially connected in the circumferential direction.

4. The motor stator based on the splicing of multiple soft magnetic materials according to claim 3, wherein: A first connection groove (101) is processed on the inner side of the radial direction of the first stator yoke lamination (1). Second connection grooves (202) and first connection protrusions (201) are respectively processed at the inner and outer radial ends of the first tooth body lamination (2). A second connection protrusion (301) is processed on the outer side of the radial direction of the first tooth tip lamination (3). The first connection protrusion (201) and the first connection groove (101) are correspondingly arranged to connect the first tooth body lamination (2) and the first stator yoke lamination (1), and the second connection groove (202) and the second connection protrusion (301) are correspondingly arranged to connect the first tooth body lamination (2) and the first tooth tip lamination (3).

5. The motor stator based on the splicing of multiple soft magnetic materials according to claim 4, characterized in that: The first tooth body lamination (2) is square or trapezoidal, and the outer radial end faces of the first stator yoke lamination (1) and the first tooth body lamination (2) are arc-shaped or flat.

6. The motor stator based on splicing of multiple soft magnetic materials according to claim 3, wherein: Weld the inner side surface of the first stator yoke lamination (1) to the outer side surface of the first tooth body lamination (2) to form a first interface (4), and weld the inner side surface of the first tooth body lamination (2) to the outer side surface of the first tooth tip lamination (3) to form a second interface (5). The welding can adopt full splicing, full welding or a combination of splicing and welding.

7. The motor stator is spliced based on a variety of soft magnetic materials, characterized in that: Adopt the splicing method of a motor stator spliced based on multiple soft magnetic materials in claim 2, including a stator yoke module, a stator tooth body module and a stator tooth tip module. The two sides of the stator tooth body module are respectively connected to the stator tooth tip module and the stator yoke module to form a stator unit, and several stator units are arranged in a circumferential array. The stator yoke module includes stator yoke laminations, the stator tooth body module includes tooth body laminations, and the stator tooth tip module includes tooth tip laminations. The number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than or equal to one. When the number of stator yoke laminations, tooth body laminations, and tooth tip laminations is greater than one, the stator yoke laminations are stacked, the tooth body laminations are stacked, and the tooth tip laminations are stacked. The stator yoke lamination is the second stator yoke lamination (11), the stator tooth body module is the second tooth body lamination (12), and the tooth tip lamination is the second tooth tip lamination (13); the radial inner side of the second tooth body lamination (12) is connected to the second tooth tip lamination (13), and the center line of the connection between the radial inner side of the second tooth body lamination (12) and the second tooth tip lamination (13) is set to coincide. The number of the second tooth body laminations (12) is the same as that of the second stator yoke laminations (11), and the second tooth body laminations (12) and the second stator yoke laminations (11) are arranged alternately in the circumferential direction.

8. The motor stator based on the splicing of multiple soft magnetic materials according to claim 7, wherein: Third connecting protrusions (16) and third connecting grooves (17) are respectively machined on the two side surfaces of the second tooth body lamination (12), and fourth connecting protrusions (18) and fourth connecting grooves (19) are respectively machined on the two side surfaces of the second stator yoke lamination (11). The third connecting protrusion (16) is correspondingly arranged with the fourth connecting groove (19), and the third connecting groove (17) is correspondingly arranged with the fourth connecting protrusion (18), so that the alternately arranged second tooth body laminations (12) and second stator yoke laminations (11) are sequentially connected.

9. The motor stator based on the splicing of multiple soft magnetic materials according to claim 8, wherein: The radially outer end surfaces of the second tooth body lamination (12) and the second stator yoke lamination (11) are arc surfaces or flat surfaces; the second tooth body lamination (12) is square or trapezoidal; a fifth connecting groove (121) is machined on the radially inner end surface of the second tooth body lamination (12), and a fifth connecting protrusion (131) is machined on the radially outer end surface of the second tooth tip lamination (13). The fifth connecting groove (121) is correspondingly arranged with the fifth connecting protrusion (131), so that the second tooth body lamination (12) is connected to the second tooth tip lamination (13).

10. The motor stator based on the splicing of multiple soft magnetic materials according to claim 7, wherein: The two circumferential sides of the second tooth body lamination (12) are respectively welded to the second stator yoke lamination (11) to form a third interface (4-1) and a fourth interface (4-2). The welding can adopt full splicing, full welding or a combination of splicing and welding.

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