Processing method of composite structure stator iron core of magnetic suspension type permanent magnet motor

Abstract

The invention discloses a processing method of a composite structure stator core of a magnetic suspension type permanent magnet motor. The processing method comprises the following steps: S1, respectively manufacturing a half-tooth stator core made of a magnetic conductive material, and a half-tooth end cover and a first end cover which are both made of a non-magnetic conductive material; s2, inserting an end cover with half teeth from one end of the half-tooth stator core, enabling a second end cover to be fixedly matched with one end of the stator yoke, and enabling a plurality of second half teeth to be attached to the inner sides of a plurality of first half teeth in a one-to-one correspondence manner at the same time, so as to form a plurality of radially distributed stator teeth in a splicing manner in the stator yoke; and S3, fixedly covering the other end of the half-tooth stator core with a first end cover, and positioning the plurality of second half teeth one by one through the first end cover. The stator teeth of the stator iron core obtained through machining are of a composite structure, the magnetic attraction force between the stator iron core and the rotor is reduced, the burden of the magnetic suspension bearing is reduced, and meanwhile the machining method is simple in assembly process, easy to operate and high in production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a method for processing a stator core of a composite structure of a magnetic suspension permanent magnet motor. Background Art

[0002] In the field of modern medical technology, blood pumps, as an important medical device, play a key role in cardiac assistance and blood circulation support. Due to the presence of mechanical bearings in the second-generation blood pumps, blood cells are destroyed, causing hemolysis and thrombosis. The development of blood pumps will inevitably enter the era of third-generation blood pumps that use suspension bearings to replace mechanical bearings. For example, the Chinese utility model patent with announcement number CN221243738U and announcement date 2024.07.02 discloses a magnetic suspension bearing for radial suspension of the rotor. The magnetic suspension motor is a landmark component of the third-generation blood pump. The permanent magnet motor is promoted because of its small size, light weight, and less invasive implantation surgery.

[0003] However, since the rotor of the magnetic suspension permanent magnet motor has no fixed constraints in the radial direction, the air gap between the rotor and the stator will allow the rotor to deviate to a certain extent during operation. The strong unbalanced magnetic pull between the permanent magnet tiles of the rotor and the stator core will cause the rotor to be attracted to one side, further increasing the offset distance, bringing a greater burden to the magnetic suspension bearing, forcing the magnetic suspension bearing structure to be large in size, which is contrary to the implantation requirements of small size, light weight, and low surgical invasiveness. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a method for processing a composite structure stator core of a magnetic suspension permanent magnet motor, so as to overcome the defect that a strong attraction exists between the rotor and the stator core in the existing permanent magnet motor, causing a large burden on the magnetic suspension bearing.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for processing a stator core of a composite structure of a magnetic levitation permanent magnet motor, comprising the following steps:

[0006] S1, respectively manufacturing a half-toothed stator core, a half-toothed end cover and a first end cover;

[0007] Wherein, the half-toothed stator core is made of a magnetic conductive material, and includes a stator yoke and a plurality of first half teeth arranged in a ring shape and at equal intervals on the inner wall of the stator yoke; the half-toothed end cover and the first end cover are both made of a non-magnetic conductive material, and the half-toothed end cover includes a second end cover and a plurality of second half teeth integrally connected to the second end cover, and the plurality of second half teeth are the same in number and correspond one to one with the plurality of first half teeth;

[0008] S2, inserting the half-toothed end cover from one end of the half-toothed stator core, and fixing the second end cover to one end of the stator yoke, and making a plurality of the second half teeth correspondingly abut against the inner sides of a plurality of the first half teeth, so as to form a plurality of radially distributed stator teeth in the interior of the stator yoke;

[0009] S3, fixing the first end cover on the other end of the half-tooth stator core, and positioning the plurality of second half teeth one by one through the first end cover.

[0010] As a further improvement of the present invention, the first end cover includes a first fixing ring and a plurality of first winding skeletons arranged in an annular shape and at equal intervals on the inner wall of the first fixing ring, and the plurality of first winding skeletons are the same in number and correspond one to one with the plurality of second half teeth;

[0011] In S3, positioning is achieved by providing a first positioning structure between each of the first winding skeletons and a corresponding second half tooth.

[0012] As a further improvement of the present invention, the first positioning structure includes a first positioning column and a first positioning groove, and the first positioning column and the first positioning groove are respectively arranged on the end faces of the second half tooth and the first winding skeleton facing each other and are plugged into each other.

[0013] As a further improvement of the present invention, a first annular step is provided on the top of the first fixing ring, and a first annular step groove is provided on the other end of the stator yoke;

[0014] In S3, the first step is interference-fitted into the first step groove to fix the first end cover to the other end of the stator yoke and to axially position the first end cover.

[0015] As a further improvement of the present invention, a second positioning structure is arranged between the first end cover and the half-tooth stator core. When the first end cover is fixedly covered at the other end of the half-tooth stator core, the second positioning structure is used to enable the plurality of first winding skeletons and the plurality of second half teeth to be arranged one by one relative to each other.

[0016] As a further improvement of the present invention, the second end cover includes a second fixing ring and a plurality of second winding skeletons arranged in a ring shape and at equal intervals on the inner wall of the second fixing ring. The plurality of second half teeth are connected to the plurality of second winding skeletons one by one and extend axially.

[0017] As a further improvement of the present invention, the first winding bobbin is provided with a first skeleton body and a first skeleton boot integrally connected to the inner side of the first skeleton body, the second winding bobbin is provided with a second skeleton body and a second skeleton boot integrally connected to the inner side of the second skeleton body, the first skeleton body and the second skeleton body are respectively attached to the two ends of the first half tooth; the inner side of the second half tooth is provided with a half-tooth boot, the first skeleton boot, the second skeleton boot and the half-tooth boot are jointly spliced ​​to form a coil limiting boot, and the coil limiting boot protrudes outward from the stator teeth on all sides.

[0018] As a further improvement of the present invention, a second annular step is provided at the bottom of the second fixing ring, and a second annular step groove is provided at one end of the stator yoke;

[0019] In S2, the second step is interference-fitted into the second stepped groove to fix the second end cover on one end of the stator yoke and to axially position the second end cover.

[0020] As a further improvement of the present invention, a third positioning structure is arranged between the second end cover and the half-toothed stator core. When the half-toothed end cover is assembled on the half-toothed stator core, the third positioning structure enables the plurality of second half teeth to be arranged one by one opposite to the plurality of first half teeth.

[0021] As a further improvement of the present invention, the half-toothed stator core is formed by machining a plurality of stacked silicon steel sheets; the half-toothed end cover and the first end cover are both formed by machining or die-casting of aluminum material.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention provides a method for processing a composite structure stator core of a magnetic levitation permanent magnet motor. The stator teeth of the stator core processed by the method are of a composite structure, that is, the outer section of the stator teeth is a first half tooth that is magnetically conductive, and the inner section is a second half tooth that is non-magnetic. When the coil is energized, the rotating magnetic field generated by the stator teeth can meet the torque required for normal operation, while reducing the magnetic attraction between the stator core and the rotor, reducing the eccentric unbalanced magnetic pull between the stator core and the rotor, reducing the burden on the magnetic levitation bearing, and ensuring the stable operation of the product;

[0024] 2. The composite structure stator core of the magnetic suspension permanent magnet motor of the present invention comprises three components, namely, a half-tooth stator core, a half-tooth end cover and a first end cover. The half-tooth end cover and the first end cover are pressed on both ends of the half-tooth stator core and form an interference fit to achieve fixation without gluing or other methods, thereby simplifying the assembly process, being easy to operate and having high production efficiency.

[0025] 3. The present invention provides positioning structures between the half-toothed end cover, the first end cover and the half-toothed stator core to prevent the second half-tooth from moving in sequence and ensure the accuracy of the second half-tooth and the first half-tooth being spliced ​​into the stator teeth;

[0026] 4. The half-toothed end cover and the first end cover in the present invention are both made of aluminum material which is non-magnetic but has better thermal conductivity than silicon steel sheets, which can help the permanent magnet motor to dissipate heat quickly and increase its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flowchart of the steps of the method for processing the stator core of the composite structure of the magnetic suspension permanent magnet motor of the present invention;

[0028] Figure 2 It is a three-dimensional diagram of the stator core of the composite structure of the magnetic suspension permanent magnet motor of the present invention;

[0029] Figure 3 A three-dimensional diagram of the stator core of the composite structure of the magnetic suspension permanent magnet motor of the present invention from another perspective;

[0030] Figure 4 A top view of the stator core of the composite structure of the magnetic suspension permanent magnet motor of the present invention;

[0031] Figure 5 It is an exploded view of the stator core of the composite structure of the magnetic suspension permanent magnet motor of the present invention;

[0032] Figure 6 It is a half-cutaway perspective view of the stator core of the composite structure of the magnetic suspension permanent magnet motor of the present invention;

[0033] Figure 7 A three-dimensional diagram of the assembly of a half-toothed stator core and a half-toothed end cover in the present invention;

[0034] Figure 8 A three-dimensional diagram of an end cover with half teeth in the present invention;

[0035] Fig. 9 A three-dimensional diagram of the end cover with half teeth in the present invention from another perspective;

[0036] Fig.10 It is a three-dimensional diagram of the first end cover in the present invention.

[0037] Combined with the attached drawings, the following description is given:

[0038] 1. half-tooth stator core; 10. stator teeth; 11. stator yoke; 111. first step slot; 112. second step slot; 12. first half tooth; 121. second positioning slot; 122. third positioning slot; 123. coil limit shoe;

[0039] 2. End cap with half teeth; 21. Second end cap; 211. Second fixing ring; 2111. Second step; 212. Second winding frame; 2121. Second frame body; 2122. Second frame boot; 2123. Third positioning column; 22. Second half teeth; 221. First positioning column; 23. Half-tooth boot; 203. Outlet notch;

[0040] 3. First end cover; 31. First fixing ring; 311. First step; 32. First winding frame; 321. First positioning groove; 322. First frame body; 323. First frame boot; 324. Second positioning column. DETAILED DESCRIPTION

[0041] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

[0042] See also Figures 1 to 10 The present invention provides a method for processing a stator core of a composite structure of a magnetic levitation permanent magnet motor, comprising steps S1 to S3.

[0043] S1, respectively manufacture a half-tooth stator core 1, a half-tooth end cover 2 and a first end cover 3, the specific structure is as follows Figure 5 shown.

[0044] The half-tooth stator core 1 is made of magnetic conductive material. In this embodiment, the half-tooth stator core 1 is formed by machining a plurality of stacked silicon steel sheets. Of course, in other embodiments of the present invention, the half-tooth stator core 1 can also be made of replaceable materials such as ferrite.

[0045] The half-tooth stator core 1 includes a stator yoke 11 and a plurality of first half teeth 12 arranged in an annular shape and at equal intervals on the inner wall of the stator yoke 11. The stator yoke 11 is generally cylindrical, and the plurality of first half teeth 12 are radially connected to the inner circumferential wall of the stator yoke 11. The number of the first half teeth 12 is not limited in the present invention, and is specifically set to 12 in this embodiment.

[0046] The half-toothed end cover 2 and the first end cover 3 are both made of non-magnetic materials. The half-toothed end cover 2 includes a second end cover 21 and a plurality of second half teeth 22 integrally connected to the second end cover 21. The number of the plurality of second half teeth 22 is the same as the number of the plurality of first half teeth 12 and corresponds one to one.

[0047] S2, insert the half-toothed end cover 2 from the upper end of the half-toothed stator core 1, and make the second end cover 21 fixedly fit to the upper end of the stator yoke 11, and make the plurality of second half teeth 22 correspondingly abut against the inner sides of the plurality of first half teeth 12, so as to form a plurality of radially distributed stator teeth 10 (such as Figure 7 shown).

[0048] The gap between two adjacent stator teeth 10 is a winding slot, and the coil is wound around the stator teeth 10 in the winding slot.

[0049] S3, the first end cover 3 is fixedly mounted on the lower end of the half-tooth stator core 1, and the plurality of second half teeth 22 are positioned one by one through the first end cover 3, thereby completing the processing of the composite structure stator core (such as Figure 2 and Figure 3 shown).

[0050] The stator teeth 10 of the stator core processed by the above method of the present invention are of a composite structure, that is, the outer section of the stator tooth 10 is a magnetic first half tooth 12, and the inner section is a non-magnetic second half tooth 22. When the coil is energized, the rotating magnetic field generated by the stator tooth 10 can meet the torque required for normal operation, while reducing the magnetic attraction between the stator core and the rotor, reducing the eccentric unbalanced magnetic pull between the stator core and the rotor, reducing the burden of the magnetic suspension bearing, and ensuring stable operation of the product. At the same time, the present invention adopts this processing method with fewer assembly steps, easy operation, and high production efficiency.

[0051] It should be noted that the radial thickness of the first half tooth 12 can be determined by experiments, so that it can achieve the torque required for normal operation while reducing the magnetic attraction of the stator core to the rotor. The overall radial thickness of the stator tooth 10 is determined according to the product size, and the radial thickness of the second half tooth 22 is determined according to the first half tooth 12 and the stator tooth 10.

[0052] Preferably, the half-toothed end cover 2 and the first end cover 3 are both made of aluminum material by machining or die-casting. Aluminum has good thermal conductivity and can be beneficial to the internal heat dissipation of the permanent magnet motor.

[0053] Of course, if heat dissipation is not considered, in other embodiments of the present invention, the half-toothed end cover 2 and the first end cover 3 may also be injection molded using high-temperature resistant, mechanically high-strength engineering plastics, such as polyetheretherketone.

[0054] See also Fig.10 The first end cover 3 includes a first fixing ring 31 and a plurality of first winding skeletons 32 arranged in an annular shape and at equal intervals on the inner wall of the first fixing ring 31. The plurality of first winding skeletons 32 are the same in number and correspond one to one with the plurality of second half teeth 22. In S3, a first positioning structure is provided between each first winding skeleton 32 and a corresponding second half tooth 22, so as to realize one-to-one positioning of the plurality of second half teeth 22.

[0055] See also Figure 6 , Figure 7 and Fig.10The first positioning structure specifically includes a first positioning column 221 and a first positioning groove 321. The first positioning column 221 and the first positioning groove 321 are respectively arranged on the end faces of the second half-tooth 22 and the first winding skeleton 32 that are opposite to each other and are plugged into each other. In this embodiment, the lower end face of each second half-tooth 22 is provided with a first positioning column 221, and the upper end face of each first winding skeleton 32 is provided with a first positioning groove 321. The first positioning column 221 and the first positioning groove 321 are plugged into one by one. Of course, in other embodiments of the present invention, the lower end face of each second half-tooth 22 may be provided with a first positioning groove 321, and the upper end face of each first winding skeleton 32 may be provided with a first positioning column 221. The first positioning column 221 and the first positioning groove 321 are plugged into one by one, and the multiple second half-teeth 22 can also be positioned one by one. The present invention adopts this positioning method to prevent the positions of the plurality of second half teeth 22 from shifting, thereby ensuring the accuracy of splicing the plurality of second half teeth 22 and the plurality of first half teeth 12 into the stator teeth 10 .

[0056] In order to facilitate plug-in fitting, chamfers may be provided along the edges of the first positioning pillars 221 .

[0057] In addition, a second positioning structure is arranged between the first end cover 3 and the half-tooth stator core 1. In S3, when the first end cover 3 is fixedly covered on the other end of the half-tooth stator core 1, the second positioning structure is used to enable multiple first winding frames 32 and multiple second half teeth 22 to be arranged one by one opposite to each other.

[0058] Continue reading Figure 6 , Figure 7 and Fig.10 The second positioning structure specifically includes a second positioning column 324 and a second positioning groove 121. In the present embodiment, the second positioning column 324 is disposed on the upper end surface of one of the first winding skeletons 32, and the second positioning groove 121 is disposed on the lower end surface of a corresponding first half tooth 12. The second positioning column 324 and the second positioning groove 121 are plugged in and matched with each other to realize the positioning of the first end cover 3, so as to facilitate the one-to-one corresponding plugging and matching of the multiple first winding skeletons 32 on the first end cover 3 and the multiple second half teeth 22 on the half-toothed end cover 2. Of course, in other embodiments of the present invention, the positions of the second positioning column 324 and the second positioning groove 121 can also be swapped, that is, the second positioning column 324 is disposed on the lower end surface of one of the first half teeth 12, and the second positioning groove 121 is disposed on the upper end surface of a corresponding first winding skeleton 32. The second positioning column 324 and the second positioning groove 121 are plugged in and matched with each other, which can also realize the positioning of the first end cover 3.

[0059] In this embodiment, preferably, the inner and outer diameters of the first fixing ring 31 are consistent with those of the stator yoke 11 .

[0060] See also Fig.10The inner ring portion of the top of the first fixing ring 31 extends axially upward to form an annular first step 311. Figure 5 A first annular stepped groove 111 is provided along the inner wall of the lower end of the stator yoke 11 , and the inner diameter of the first stepped groove 111 is smaller than the outer diameter of the first step 311 .

[0061] like Figure 6 As shown, in S3, by pressing the first step 311 into the first step groove 111, the interference fit between the first step 311 and the first step groove 111 is utilized to realize the fixing cover of the first end cover 3 to the lower end of the stator yoke 11. At the same time, the first step 311 stops at the bottom of the first step groove 111 to realize the axial positioning of the first end cover 3. The first end cover 3 and the stator yoke 11 of the present invention are fixed by this press-fit interference fit method, without gluing or other methods, simplifying the assembly process, and the subsequent curing such as coil winding and varnishing can ensure firm and reliable fixation.

[0062] See also Figure 8 and Fig. 9 The second end cover 21 includes a second fixing ring 211 and a plurality of second winding skeletons 212 arranged in an annular shape and at equal intervals on the inner wall of the second fixing ring 211. The second winding skeleton 212 has the same shape as the first winding skeleton 32. The plurality of second half teeth 22 are integrally connected to the lower end surfaces of the plurality of second winding skeletons 212 in a one-to-one correspondence and all extend in the axial direction.

[0063] In this embodiment, the inner and outer diameters of the second fixing ring 211 are preferably the same as those of the stator yoke 11. Fig. 9 The inner ring portion of the bottom of the second fixing ring 211 extends axially downward to form an annular second step 2111. Figure 6 An annular second stepped groove 112 is provided along the inner wall of the upper end of the stator yoke 11 , and the inner diameter of the second stepped groove 112 is smaller than the outer diameter of the second step 2111 .

[0064] like Figure 6 As shown, in S2, by pressing the second step 2111 into the second step groove 112, the interference fit between the second step 2111 and the second step groove 112 is utilized to realize the fixing cover of the second end cover 21 on the upper end of the stator yoke 11. At the same time, the second step 2111 stops at the bottom of the second step groove 112 to realize the axial positioning of the second end cover 21. The second end cover 21 of the present invention is fixed to the stator yoke 11 by such a press-fit interference fit method, without gluing or other methods, simplifying the assembly process, and the subsequent curing such as coil winding and varnishing can ensure a firm and reliable fixation.

[0065] It is worth mentioning that a third positioning structure is arranged between the second end cover 21 and the half-tooth stator core 1. In S2, when the half-tooth end cover 2 is assembled on the half-tooth stator core 1, the third positioning structure is used to enable the plurality of second half teeth 22 to be arranged one by one opposite to the plurality of first half teeth 12.

[0066] Please refer again Figure 6 , the third positioning structure specifically includes a third positioning column 2123 and a third positioning groove 122. In this embodiment, the third positioning column 2123 is arranged on the lower end surface of one of the second winding skeletons 212, and the third positioning groove 122 is arranged on the upper end surface of a corresponding first half tooth 12. The third positioning column 2123 and the third positioning groove 122 are plugged in and matched to achieve the positioning of the half-toothed end cover 2, so as to ensure that the multiple second half teeth 22 on the half-toothed end cover 2 and the multiple first half teeth 12 on the half-toothed stator core 1 are arranged one by one. Similarly, in other embodiments of the present invention, the positions of the third positioning column 2123 and the third positioning groove 122 can also be swapped, that is, the third positioning column 2123 is arranged on the upper end surface of one of the first half teeth 12, the third positioning groove 122 is arranged on the lower end surface of a corresponding second winding skeleton 212, and the second positioning column 324 is plugged in and matched with the second positioning groove 121, which can also achieve the positioning of the half-toothed end cover 2.

[0067] See also Figures 5 to 10 The first winding frame 32 includes a first frame body 322 and a first frame boot 323 integrally connected to the inner side of the first frame body 322; Figure 8 The second winding bobbin 212 is provided with a second bobbin body 2121 and a second bobbin boot 2122 integrally connected to the inner side of the second bobbin body 2121; the first bobbin body 322 and the second bobbin body 2121 are respectively attached to the two ends of the first half tooth 12. A half tooth boot 23 is provided on the inner side of the second half tooth 22, and the first bobbin boot 323, the second bobbin boot 2122 and the half tooth boot 23 are spliced ​​together to form a coil limiting boot 123, and the surrounding of the coil limiting boot 123 protrudes outward from the stator tooth 10. The coil limiting boot 123 is used to reduce the notch of the winding slot to limit the coil wound on the stator tooth 10 and the first winding bobbin 32 and the second winding bobbin 212, effectively improving the winding efficiency and reducing the winding difficulty.

[0068] See also Figure 2 and Figure 3 The half-toothed end cover 2 and the first end cover 3 are both provided with a wire outlet notch 203 for leading the coil terminal outward to protect the coil from damage.

[0069] It can be understood that the axial direction and radial direction described in this article are all based on the composite structure stator core as a reference object.

[0070] It can be seen that the present invention provides a method for processing a composite structure stator core of a magnetic levitation permanent magnet motor. The stator teeth 10 of the stator core processed by the present method are of a composite structure, that is, the outer section of the stator tooth 10 is a magnetic first half tooth 12, and the inner section is a non-magnetic second half tooth 22. When the coil is energized, the rotating magnetic field generated by the stator tooth 10 can meet the torque required for normal operation, while reducing the magnetic attraction between the stator core and the rotor, reducing the eccentric unbalanced magnetic pull between the stator core and the rotor, reducing the burden of the magnetic levitation bearing, and ensuring the stable operation of the product. The composite structure stator core of the magnetic levitation permanent magnet motor of the present invention includes three components, namely, a half-tooth stator. The iron core 1, the half-toothed end cover 2 and the first end cover 3, the half-toothed end cover 2 and the first end cover 3 are all pressed on the two ends of the half-toothed stator iron core 1 and form an interference fit to achieve fixation, without gluing or other methods, simplifying the assembly process, easy operation, and high production efficiency; at the same time, the present invention is provided with a positioning structure between the half-toothed end cover 2, the first end cover 3 and the half-toothed stator iron core 1 to prevent the position of the second half tooth 22 from moving in sequence, ensuring the accuracy of the second half tooth 22 and the first half tooth 12 being spliced ​​into the stator tooth 10; in addition, the half-toothed end cover 2 and the first end cover 3 in the present invention are both made of aluminum material that is not magnetic but has better thermal conductivity than silicon steel sheets, which can help the permanent magnet motor to quickly dissipate heat and improve its service life.

[0071] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A method for processing a composite structure stator core of a magnetic levitation permanent magnet motor, characterized in that: The following steps are involved: S1, respectively manufacturing a half-toothed stator core (1), a half-toothed end cover (2), and a first end cover (3); The half-toothed stator core (1) is made of a magnetically conductive material, comprising a stator yoke (11) and a plurality of first half teeth (12) arranged in a ring-shaped manner and at equal intervals on the inner wall of the stator yoke (11); the half-toothed end cover (2) and the first end cover (3) are both made of non-magnetic conductive materials, the half-toothed end cover (2) comprises a second end cover (21) and a plurality of second half teeth (22) integrally connected to the second end cover (21), and the number of the plurality of second half teeth (22) is the same as the number of the plurality of first half teeth (12) and corresponds one to one; S2, inserting the half-toothed end cover (2) from one end of the half-toothed stator core (1), and making the second end cover (21) fixedly fit to one end of the stator yoke (11), and making a plurality of the second half teeth (22) correspondingly abut against the inner sides of a plurality of the first half teeth (12) one by one, so as to form a plurality of radially distributed stator teeth (10) by splicing inside the stator yoke (11); S3, fixing the first end cover (3) on the other end of the half-tooth stator core (1), and positioning the plurality of second half teeth (22) one by one through the first end cover (3).

2. The method for processing the composite structure stator core of the magnetic levitation permanent magnet motor according to claim 1 is characterized in that: The first end cover (3) comprises a first fixing ring (31) and a plurality of first winding skeletons (32) arranged in an annular shape and at equal intervals on the inner wall of the first fixing ring (31), wherein the number of the plurality of first winding skeletons (32) is the same as the number of the plurality of second half teeth (22) and corresponds one to one; In S3, positioning is achieved by providing a first positioning structure between each of the first winding skeletons (32) and a corresponding second half tooth (22).

3. The method for processing the stator core of the composite structure of the magnetic levitation permanent magnet motor according to claim 2 is characterized in that: The first positioning structure comprises a first positioning column (221) and a first positioning groove (321), wherein the first positioning column (221) and the first positioning groove (321) are respectively arranged on the end surfaces of the second half tooth (22) and the first winding frame (32) which are opposite to each other and are plugged into and matched with each other.

4. The method for processing the stator core of the composite structure of the magnetic levitation permanent magnet motor according to claim 2 is characterized in that: A first annular step (311) is provided at the top of the first fixing ring (31), and a first annular step groove (111) is provided at the other end of the stator yoke (11); In S3, the first step (311) is interference-fitted into the first step groove (111) to achieve the first end cover (3) being fixedly arranged on the other end of the stator yoke (11) and the first end cover (3) being axially positioned.

5. The method for processing the composite structure stator core of the magnetic levitation permanent magnet motor according to claim 2, characterized in that: A second positioning structure is provided between the first end cover (3) and the half-tooth stator core (1); when the first end cover (3) is fixedly provided on the other end of the half-tooth stator core (1), the second positioning structure enables a plurality of the first winding skeletons (32) and a plurality of the second half teeth (22) to be arranged one by one in opposition to each other.

6. The method for processing the composite structure stator core of the magnetic levitation permanent magnet motor according to claim 2, characterized in that: The second end cover (21) comprises a second fixing ring (211) and a plurality of second winding skeletons (212) arranged in an annular shape and at equal intervals on the inner wall of the second fixing ring (211); the plurality of second half teeth (22) are connected to the plurality of second winding skeletons (212) in a one-to-one correspondence and all extend in the axial direction.

7. The method for processing the composite structure stator core of the magnetic levitation permanent magnet motor according to claim 6, characterized in that: The first winding frame (32) is provided with a first frame body (322) and a first frame boot (323) integrally connected to the inner side of the first frame body (322); the second winding frame (212) is provided with a second frame body (2121) and a second frame boot (2122) integrally connected to the inner side of the second frame body (2121); the first frame body (322) and the second frame body (2121) are respectively attached to the two ends of the first half tooth (12); the inner side of the second half tooth (22) is provided with a half tooth boot (23); the first frame boot (323), the second frame boot (2122) and the half tooth boot (23) are jointly spliced ​​to form a coil limiting boot (123); the coil limiting boot (123) protrudes outwardly from the stator tooth (10) on all sides.

8. The method for processing the composite structure stator core of the magnetic levitation permanent magnet motor according to claim 6, characterized in that: The bottom of the second fixing ring (211) is provided with an annular second step (2111), and one end of the stator yoke (11) is provided with an annular second step groove (112); In S2, the second step (2111) is interference-fitted into the second step groove (112) so as to fix the second end cover (21) on one end of the stator yoke (11) and axially position the second end cover (21).

9. The method for processing a composite structure stator core of a magnetic levitation permanent magnet motor according to claim 1, characterized in that: A third positioning structure is provided between the second end cover (21) and the half-toothed stator core (1); when the half-toothed end cover (2) is assembled on the half-toothed stator core (1), the third positioning structure enables a plurality of the second half teeth (22) to be arranged one by one opposite to a plurality of the first half teeth (12).

10. The method for processing a composite structure stator core of a magnetic levitation permanent magnet motor according to claim 1, characterized in that: The half-toothed stator core (1) is formed by machining a plurality of stacked silicon steel sheets; the half-toothed end cover (2) and the first end cover (3) are both formed by machining or die-casting of aluminum material.

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