Stator structure and bearingless magnetic suspension motor

Abstract

The invention belongs to the technical field of magnetic suspension, and particularly relates to a stator structure and a bearingless magnetic suspension motor. The stator structure is applied to the magnetic suspension device and comprises a suspension assembly and a torque assembly, the suspension assembly and the torque assembly are arranged at intervals in the axial direction of the stator structure, the suspension assembly comprises a suspension iron core and a suspension coil, and the torque assembly comprises a torque iron core and a torque coil; the suspension iron core comprises a plurality of first winding teeth distributed at intervals in the circumferential direction of the suspension iron core, each first winding tooth is provided with a suspension coil, the torque iron core comprises a plurality of second winding teeth distributed at intervals in the circumferential direction of the torque iron core, and each second winding tooth is provided with a torque coil. After the structure is adopted, the suspension magnetic circuit and the torque magnetic circuit do not interfere with each other, the control is simple, the torque is increased, the shaft diameter ratio of the rotor is increased, the overturning stability can be improved, and the problem that the control precision of an existing magnetic suspension device on the rotor is low can be solved.

Description

Technical Field

[0001] The present application belongs to the field of magnetic levitation technology, and specifically relates to a stator structure and a bearingless magnetic levitation motor. Background Art

[0002] In recent years, magnetic levitation motors have been increasingly widely used in aerospace, petrochemical, industrial equipment and other fields. Magnetic levitation motors are a high-efficiency motor technology that uses permanent magnets or electromagnets to generate a magnetic field and uses the interaction of the magnetic field to achieve suspension and rotation between the rotor and stator, thereby eliminating friction and wear.

[0003] In the related art, the stator of the magnetic levitation motor includes an iron core, on which a levitation coil and a torque coil are wound, and the levitation coil is used to suspend the rotor, and the torque coil is used to rotate the rotor. However, the magnetic levitation motor of the related art has low control accuracy on the rotor. Summary of the invention

[0004] The purpose of the present application is to provide a stator structure and a bearingless magnetic levitation motor, which can solve the problem of low control accuracy of the rotor by magnetic levitation devices such as current magnetic levitation motors.

[0005] In order to solve the above technical problems, this application is implemented as follows: In a first aspect, the present application provides a stator structure, which is applied to a magnetic suspension device, and includes a suspension component and a torque component, wherein the suspension component and the torque component are arranged at intervals along the axial direction of the stator structure, the suspension component includes a suspension core and a suspension coil, and the torque component includes a torque core and a torque coil; The suspension core comprises a plurality of first winding teeth spaced apart along its circumference, each of which is provided with a suspension coil; the torque core comprises a plurality of second winding teeth spaced apart along its circumference, each of which is provided with a torque coil.

[0006] In some embodiments, along the radial direction of the stator structure, an extension length of the first winding tooth is greater than an extension length of the second winding tooth.

[0007] In some embodiments, the number of the first winding teeth is less than the number of the second winding teeth, the suspension core further includes a first yoke, each of the first winding teeth is connected to the first yoke and distributed on the outer periphery of the first yoke, the torque core further includes a second yoke, each of the second winding teeth is connected to the second yoke and distributed on the outer periphery of the second yoke, and the outer edge of the first winding teeth is flush with the outer edge of the second winding teeth; and / or, In a radial direction of the stator structure, an extension length of the suspension coil is greater than an extension length of the torque coil.

[0008] In some embodiments, along the radial direction of the stator structure, two ends of the suspension coil respectively extend beyond two ends of the torque coil.

[0009] In some embodiments, the stator structure is an inner stator structure, and along the radial direction of the inner stator structure, the minimum distance that the outer end of the suspension coil extends beyond the outer end of the torque coil is a first distance, and the minimum distance that the inner end of the suspension coil extends beyond the inner end of the torque coil is a second distance, and the second distance is greater than the first distance.

[0010] In some embodiments, along the axial direction of the stator structure, the thickness of the first winding tooth is greater than the thickness of the second winding tooth.

[0011] In some embodiments, the winding thickness of the suspension coil is smaller than the winding thickness of the torque coil.

[0012] In some embodiments, the torque core and the suspension core are coaxially arranged, and in the axial direction of the stator structure, the center line of the first winding tooth and the center line of the second winding tooth are staggered.

[0013] In some embodiments, the stator structure further includes a rotation stopper, wherein the rotation stopper is located between the suspension core and the torque core; A plurality of first stop posts are provided on the side of the stop member facing the suspension core, and each of the first stop posts extends into the first core slot between each adjacent two of the first winding teeth, and is respectively in limiting contact with the two adjacent first winding teeth; and / or a plurality of second stop posts are provided on the side of the stop member facing the torque core, and each of the second stop posts extends into the second core slot between each adjacent two of the second winding teeth, and is respectively in limiting contact with the two adjacent second winding teeth.

[0014] In a second aspect, the present application provides a bearingless magnetic levitation motor, comprising the above-mentioned stator structure.

[0015] The beneficial technical effects of this application are as follows: In the present application, the stator structure includes two independent and spaced suspension cores and torque cores, and the suspension coils are wound on the multiple first winding teeth of the suspension core, and the torque coils are wound on the multiple second winding teeth of the torque core. It can be seen that the present application realizes the structural decoupling design of the stator structure in terms of suspension and rotation by separately setting the suspension core and the torque core. The decoupling design can reduce the mutual influence between the suspension magnetic circuit and the torque magnetic circuit, thereby improving the control accuracy of the rotor and making the displacement accuracy of the rotor higher; and through the decoupling design, the suspension and rotation of the rotor can be controlled independently, which can simplify the control algorithm.

[0016] In addition, the radial extension length of the first winding tooth of the present application is greater than the radial extension length of the second winding tooth, so the area of ​​the core slot between two adjacent first winding teeth is larger, which not only provides a larger operating space for winding the suspension coil and facilitates the winding of the suspension coil, but also increases the number of turns of the suspension coil to increase the suspension force applied to the rotor, thereby improving the stability and anti-interference of the rotor suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure of the stator structure disclosed in the embodiment of this application is shown in FIG. Figure 1 ; Figure 2 An exploded schematic diagram of a stator structure disclosed in an embodiment of the present application; Figure 3 The structure of the stator structure disclosed in the embodiment of this application is shown in FIG. Figure 2 ; Figure 4 For this application Figure 3 The enlarged schematic diagram of point A in the middle; Figure 5 This is a schematic diagram of the structure of a bearingless magnetic levitation motor disclosed in an embodiment of the present application.

[0018] Description of reference numerals: 100, suspension assembly; 110, suspension core; 111, first winding tooth; 112, first magnetic yoke; 120, suspension coil; 200, torque assembly; 210, torque core; 211, second winding tooth; 212, second magnetic yoke; 220, torque coil; 300, stopper; 310, first stop post; 320, second stop post; 400, rotor; 500, magnetic isolation ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0021] The stator structure and the bearingless magnetic levitation motor provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0022] In the related art, the suspension coil and the torque coil are arranged on the same iron core, so the suspension magnetic circuit generated by the suspension coil and the torque magnetic circuit generated by the torque coil will have mutual influence, which will obviously reduce the control accuracy of the rotor. In addition, the shaft-to-diameter ratio of the rotor in the related art is small, that is, the ratio of the axial length of the rotor permanent magnet to the outer diameter of the rotor permanent magnet has an applicable range, and the axial length is smaller than the outer diameter, which will lead to such bearingless magnetic suspension motors with small output torque and poor flipping stability; from the control point of view, the control of such bearingless magnetic suspension motors is relatively complex.

[0023] like Figures 1 to 4 As shown, an embodiment of the present application discloses a stator structure, which is applied to a magnetic levitation device. The magnetic levitation device here can be a magnetic levitation motor, a bearingless magnetic levitation motor and other devices. The magnetic levitation device includes a suspension component 100 and a torque component 200. The suspension component 100 and the torque component 200 are arranged at intervals along the axial direction of the stator structure. The suspension component 100 includes a suspension core 110 and a suspension coil 120, and the torque component 200 includes a torque core 210 and a torque coil 220.

[0024] The suspension core 110 includes a plurality of first winding teeth 111 spaced apart along its circumference, and each first winding tooth 111 is provided with a suspension coil 120. The torque core 210 includes a plurality of second winding teeth 211 spaced apart along its circumference, and each second winding tooth 211 is provided with a torque coil 220. For example, the number of the first winding teeth 111 can be 4, 8, etc.; the number of the second winding teeth 211 can be 8 in the case of two phases; 6, 12, etc. in the case of three phases. The present application does not limit the number of the first winding teeth 111 and the second winding teeth 211.

[0025] In the present application, the stator structure includes two independent and spaced suspension cores 110 and torque cores 210, and the suspension coils 120 are wound on the multiple first winding teeth 111 of the suspension core 110, and the torque coils 220 are wound on the multiple second winding teeth 211 of the torque core 210. It can be seen that the present application realizes the structural decoupling design of the stator structure in terms of suspension and rotation by separately arranging the suspension core 110 and the torque core 210. The decoupling design can reduce the mutual influence between the suspension magnetic circuit and the torque magnetic circuit, thereby improving the control accuracy of the rotor 400, so that the displacement accuracy of the rotor 400 is higher; and through the decoupling design, the suspension and rotation of the rotor 400 can be independently controlled, which can simplify the control algorithm, increase the torque, expand the rotor shaft diameter ratio, and improve the flipping stability.

[0026] In an optional embodiment, along the radial direction of the stator structure, the extension length of the first winding tooth 111 is greater than the extension length of the second winding tooth 211. Specifically, the radial direction of the stator structure refers to a direction perpendicular to the axial direction of the stator structure, and the extension length of the first winding tooth 111 along the radial direction of the stator structure is Figure 2 The size indicated by L1 in the figure.

[0027] The radial extension length of the first winding tooth 111 of the present application is greater than the radial extension length of the second winding tooth 211, so the area of ​​the core slot between two adjacent first winding teeth 111 is larger, which not only provides a larger operating space for winding the suspension coil 120 and facilitates the winding of the suspension coil 120, but also increases the number of turns of the suspension coil 120 to increase the suspension force applied to the rotor 400, thereby improving the stability and anti-interference of the suspension of the rotor 400.

[0028] In an optional embodiment, the number of first winding teeth 111 is less than the number of second winding teeth 211, the suspension core 110 also includes a first magnetic yoke 112, each first winding tooth 111 is connected to the first magnetic yoke 112 and distributed on the periphery of the first magnetic yoke 112, the torque core 210 also includes a second magnetic yoke 212, each second winding tooth 211 is connected to the second magnetic yoke 212 and distributed on the periphery of the second magnetic yoke 212, and the outer edge of the first winding tooth 111 is flush with the outer edge of the second winding tooth 211.

[0029] In this embodiment, the outer edge of the first winding tooth 111 is flush with the outer edge of the second winding tooth 211, and the length of the first winding tooth 111 is greater than the length of the second winding tooth 211. This allows the first magnetic yoke 112 to have a smaller size to reduce the weight of the suspension core 110. The lighter suspension core 110 can respond to the control signal faster to improve the response sensitivity of the magnetic suspension device. It should be noted that, since the number of the first winding teeth 111 is less than the number of the second winding teeth 211, the sum of the cross-sectional areas of the first winding teeth 111 is less than the sum of the cross-sectional areas of the second winding teeth 211, and the mixed magnetic flux of the suspension core 110 is also less than the mixed magnetic flux of the torque core 210, so that the mixed magnetic flux on the first magnetic yoke 112 of the suspension core 110 is also less than the mixed magnetic flux on the second magnetic yoke 212 of the torque core 210, that is, the magnetic saturation on the first magnetic yoke 112 is low, so even if the size of the first magnetic yoke 112 is set to be small, the magnetic saturation on the first magnetic yoke 112 will not be too high, thereby avoiding serious heating of the first magnetic yoke 112. It can be seen that this embodiment can not only reduce the weight of the stator assembly, but also improve the response sensitivity of the magnetic suspension device while avoiding serious heating of the suspension core 110.

[0030] Generally speaking, the number of first winding teeth 111 is less than the number of second winding teeth 211, so the mixed magnetic flux of the suspension core 110 is also smaller than the mixed magnetic flux of the torque core 210. In order to increase the mixed magnetic flux of the suspension core 110, in an optional embodiment, along the radial direction of the stator structure, the extension length of the suspension coil 120 is greater than the extension length of the torque coil 220.

[0031] In this embodiment, the extension length of the suspension coil 120 is greater than the extension length of the torque coil 220, which can increase the magnetic flux of the suspension core 110, so that the rotor 400 can be suspended more stably. In addition, the longer suspension coil 120 can provide a larger magnetic flux variation range, which makes the magnetic flux variation generated by the suspension coil 120 more significantly affected by the suspension force, thereby improving the control accuracy of the position of the rotor 400. It should be noted that, since the first winding tooth 111 of the present application has a larger length, even if the suspension coil 120 is longer, the suspension coil 120 can be conveniently wound onto the first winding tooth 111.

[0032] In an optional embodiment, along the radial direction of the stator structure, two ends of the suspension coil 120 extend beyond two ends of the torque coil 220 .

[0033] If one end of the suspension coil 120 is located between the two ends of the torque coil 220, or all parts of the suspension coil 120 are located on one side of the torque coil 220, the suspension coil 120 is either too far from the first magnetic yoke 112 of the suspension core 110 or too far from the rotor 400. If the suspension coil 120 is too far from the first magnetic yoke 112 of the suspension core 110, the magnetic path from the suspension coil 120 to the first magnetic yoke 112 of the suspension core 110 will be too long, which may increase the magnetic leakage and thus have a negative impact on the suspension of the rotor 400; if the suspension coil 120 is too far from the rotor 400, the magnetic force applied by the suspension coil 120 to the rotor 400 will be reduced, thus having a negative impact on the suspension of the rotor 400. Therefore, in this embodiment, the two ends of the suspension coil 120 are respectively beyond the two ends of the torque coil 220, so that the suspension coil 120 can be prevented from being too far away from the first magnetic yoke 112 of the suspension core 110 and the rotor 400, that is, the distance between the suspension coil 120 and the first magnetic yoke 112 of the suspension core 110 is moderate, and the distance between the suspension coil 120 and the rotor 400 is also moderate, which can not only reduce the leakage magnetic amount, but also enable the suspension coil 120 to exert a larger magnetic force on the rotor 400, thereby improving the stability of the suspension of the rotor 400.

[0034] In an alternative embodiment, see Figure 4 , the stator structure is an inner stator structure, and along the radial direction of the inner stator structure, the minimum distance between the outer end of the suspension coil 120 and the outer end of the torque coil 220 is a first distance (given by Figure 4 As shown in D1 in FIG. 1 ), the minimum distance by which the inner end of the suspension coil 120 exceeds the inner end of the torque coil 220 is the second distance (given by Figure 4 As shown in D2 in FIG. 1 ), the second distance is greater than the first distance.

[0035] In this embodiment, the second distance that the inner end of the suspension coil 120 extends out of the torque coil 220 is greater than the first distance that the outer end of the suspension coil 120 extends out of the torque coil 220, which can further reduce the distance between the suspension coil 120 and the first magnetic yoke 112 of the suspension core 110, thereby further shortening the magnetic path between the suspension coil 120 and the first magnetic yoke 112, so as to further reduce the magnetic leakage, so that the rotor 400 can be suspended more stably. In addition, the suspension coil 120 of this embodiment has a larger inner extension than the torque coil 220. This design can make the suspension electromagnetic field more evenly distributed inside the first magnetic yoke 112, so as to reduce the distortion and irregularity of the suspension electromagnetic field, which helps to reduce electromagnetic energy loss and electromagnetic interference, thereby improving the overall efficiency of the magnetic suspension device.

[0036] In an optional embodiment, along the axial direction of the stator structure, the thickness of the first winding tooth 111 is greater than the thickness of the second winding tooth 211. Specifically, the thickness of the first winding tooth 111 along the axial direction is Figure 2 D3 is shown in FIG.

[0037] In this embodiment, the thickness of the first winding tooth 111 is greater than the thickness of the second winding tooth 211, which allows the first winding tooth 111 to have a larger cross-sectional area. When the suspension coil 120 is wound onto the first winding tooth 111, the suspension coil 120 has a larger inner diameter, which can increase the magnetic flux on the suspension core 110, thereby increasing the suspension force applied to the rotor 400; and increasing the thickness of the first winding tooth 111 helps to optimize the magnetic circuit design, making the distribution of the magnetic lines of force more uniform, reducing magnetic flux concentration and saturation, and improving the performance of the magnetic suspension device.

[0038] In an optional embodiment, the winding thickness of the suspension coil 120 is less than the winding thickness of the torque coil 220. Specifically, the winding thickness of the suspension coil 120 is the height of the suspension coil 120 protruding from the outer circumference of the first winding tooth 111; similarly, the winding thickness of the torque coil 220 is the height of the torque coil 220 protruding from the outer circumference of the second winding tooth 211.

[0039] In this embodiment, the winding thickness of the suspension coil 120 is small, and it is more sensitive to the current change, so when the suspension force needs to be quickly adjusted to respond to external disturbances, the magnetic suspension device can respond more quickly. In addition, the thinner winding of the suspension coil 120 can make the magnetic flux distribution more concentrated, thereby generating a stronger magnetic field in the suspension core 110, which can improve the suspension force and reduce magnetic force fluctuations.

[0040] In an optional embodiment, the torque core 210 is coaxially arranged with the suspension core 110, and in the axial direction of the stator structure, the center line of the first winding tooth 111 is offset from the center line of the second winding tooth 211. Specifically, the center line of the first winding tooth 111 is parallel to the extension direction of the first winding tooth 111, and the center line of the second winding tooth 211 is parallel to the direction of the second winding tooth 211; see Figure 3 , the center line of the first winding tooth 111 is Figure 3 The dotted line located at the lower side of the two dotted lines, the center line of the second winding tooth 211 is Figure 3 The upper one of the two dot-dash lines.

[0041] In this embodiment, the center line of the first winding tooth 111 and the center line of the second winding tooth 211 are offset, which can make the suspension coil 120 wound on the first winding tooth 111 and the torque coil 220 wound on the second winding tooth 211 staggered with each other, that is, there is no situation where the suspension coil 120 and the torque coil 220 are directly opposite to each other, which can reduce the magnetic interference between the suspension coil 120 and the torque coil 220, thereby ensuring the control accuracy of the rotor 400 and making the displacement accuracy of the rotor higher.

[0042] In an optional embodiment, the stator structure further includes a rotation stopper 300 , and the rotation stopper 300 is located between the suspension core 110 and the torque core 210 .

[0043] A plurality of first stop posts 310 are provided on the side of the stop member 300 facing the suspension core 110, and each first stop post 310 extends into the first core slot between each two adjacent first winding teeth 111, and is respectively in position-limiting contact with the two adjacent first winding teeth 111. Specifically, a first core slot is formed between any two adjacent first winding teeth 111, and each first stop post 310 extends into each first core slot, and each first stop post 310 cooperates with the two adjacent first winding teeth 111 in the circumferential upper limit of the suspension core 110.

[0044] In this embodiment, the suspension core 110 is limited in its own circumferential direction by the first anti-rotation column 310 to prevent the suspension core 110 from rotating relative to the torque core 210, thereby preventing the first winding teeth 111 from being directly opposite to the second winding teeth 211 on the suspension core 110, so as to ensure the control accuracy of the rotor 400. In addition, the plurality of first anti-rotation columns 310 define a unique position between the anti-rotation member 300 and the suspension core 110, so as to ensure that the suspension core 110 and the torque core 210 are staggered at a certain angle, thereby reducing the magnetic interference between the suspension coil 120 and the torque coil 220.

[0045] In a further embodiment, the anti-rotation member 300 is made of magnetic isolation material, which can further reduce the magnetic interference between the suspension coil 120 and the torque coil 220 .

[0046] And / or, a plurality of second stop posts 320 are provided on the side of the stop member 300 facing the torque core 210, and each second stop post 320 extends into the second core slot between each two adjacent second winding teeth 211, and is respectively in position-limiting contact with two adjacent second winding teeth 211. Specifically, a second core slot is formed between any two adjacent second winding teeth 211, and each second stop post 320 extends into each second core slot, and each second stop post 320 cooperates with two adjacent second winding teeth 211 at the circumferential upper limit of the torque core 210.

[0047] In this embodiment, the torque core 210 is limited in its own circumferential direction by the second stopper 320 to prevent the torque core 210 from rotating relative to the suspension core 110, thereby preventing the second winding teeth 211 from being directly opposite to the first winding teeth 111 on the torque core 210, so as to ensure the control accuracy of the rotor 400. In addition, the plurality of second stopper 320 defines a unique position between the stopper 300 and the torque core 210, so as to ensure that the torque core 210 and the suspension core 110 are staggered at a certain angle, thereby reducing the magnetic interference between the suspension coil 120 and the torque coil 220.

[0048] like Figure 5 As shown, the embodiment of the present application also discloses a bearingless magnetic levitation motor, including the stator structure described in any of the above embodiments, so that the bearingless magnetic levitation motor also has the beneficial effects of the above stator structure, which will not be repeated here. Optionally, the bearingless magnetic levitation motor also includes a rotor 400, the rotor 400 is sleeved with the stator, and a levitation magnet and a torque magnet are provided on the rotor 400. The levitation magnet is arranged corresponding to the levitation coil 120, and the torque magnet is arranged corresponding to the torque coil 220. The levitation of the rotor 400 can be controlled by the levitation magnetic field generated between the levitation coil 120 and the levitation magnet, and the rotation of the rotor 400 can be controlled by the rotating magnetic field generated between the torque coil 220 and the torque magnet. Further, the stator structure is an inner stator structure, and the rotor 400 is sleeved outside the inner stator structure.

[0049] In an optional embodiment, the bearingless magnetic levitation motor further includes a magnetic isolation ring 500, the levitation magnet and the torque magnet are spaced apart in the axial direction, and the magnetic isolation ring 500 is arranged between the levitation magnet and the torque magnet, thereby reducing magnetic interference between the levitation magnet and the torque magnet.

[0050] The above embodiments of the present application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims

1. A stator structure, applied to a magnetic suspension device, characterized in that: The invention comprises a suspension component (100) and a torque component (200), wherein the suspension component (100) and the torque component (200) are arranged at intervals along the axial direction of the stator structure, the suspension component (100) comprises a suspension iron core (110) and a suspension coil (120), and the torque component (200) comprises a torque iron core (210) and a torque coil (220); The suspension iron core (110) comprises a plurality of first winding teeth (111) spaced apart along its own circumference, each of the first winding teeth (111) being provided with the suspension coil (120), and the torque iron core (210) comprises a plurality of second winding teeth (211) spaced apart along its own circumference, each of the second winding teeth (211) being provided with the torque coil (220).

2. The stator structure according to claim 1, characterized in that: In the radial direction of the stator structure, the extension length of the first winding tooth (111) is greater than the extension length of the second winding tooth (211).

3. The stator structure according to claim 2, characterized in that: The number of the first winding teeth (111) is less than the number of the second winding teeth (211); the suspension core (110) further comprises a first magnetic yoke (112); each of the first winding teeth (111) is connected to the first magnetic yoke (112) and is distributed on the outer periphery of the first magnetic yoke (112); the torque core (210) further comprises a second magnetic yoke (212); each of the second winding teeth (211) is connected to the second magnetic yoke (212) and is distributed on the outer periphery of the second magnetic yoke (212); and the outer edge of the first winding teeth (111) is flush with the outer edge of the second winding teeth (211); and / or, In the radial direction of the stator structure, the extension length of the suspension coil (120) is greater than the extension length of the torque coil (220).

4. The stator structure according to claim 3, characterized in that: In the radial direction of the stator structure, two ends of the suspension coil (120) respectively extend beyond two ends of the torque coil (220).

5. The stator structure according to claim 4, characterized in that: The stator structure is an inner stator structure; along the radial direction of the inner stator structure, the minimum distance by which the outer end of the suspension coil (120) exceeds the outer end of the torque coil (220) is a first distance, and the minimum distance by which the inner end of the suspension coil (120) exceeds the inner end of the torque coil (220) is a second distance, and the second distance is greater than the first distance.

6. The stator structure according to any one of claims 3 to 5, characterized in that: Along the axial direction of the stator structure, the thickness of the first winding tooth (111) is greater than the thickness of the second winding tooth (211).

7. The stator structure according to claim 6, characterized in that: The winding thickness of the suspension coil (120) is smaller than the winding thickness of the torque coil (220).

8. The stator structure according to any one of claims 2 to 5, characterized in that: The torque iron core (210) and the suspension iron core (110) are coaxially arranged, and in the axial direction of the stator structure, the center line of the first winding tooth (111) and the center line of the second winding tooth (211) are staggered.

9. The stator structure according to claim 8, characterized in that: The stator structure further comprises a rotation stopper (300), wherein the rotation stopper (300) is located between the suspension iron core (110) and the torque iron core (210); A plurality of first stop posts (310) are provided on a side of the stop member (300) facing the suspension core (110), and each of the first stop posts (310) extends into a first core slot between two adjacent first winding teeth (111) and is in position-limiting contact with two adjacent first winding teeth (111); and / or a plurality of second stop posts (320) are provided on a side of the stop member (300) facing the torque core (210), and each of the second stop posts (320) extends into a second core slot between two adjacent second winding teeth (211) and is in position-limiting contact with two adjacent second winding teeth (211).

10. A bearingless magnetic levitation motor, characterized in that: The invention comprises a stator structure as claimed in any one of claims 1 to 9.

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