Magnetic levitation bearing, control method thereof, magnetic levitation motor and new fan

Abstract

The application provides a magnetic suspension bearing, a control method thereof, a magnetic suspension motor and a new fan. The magnetic suspension bearing comprises a plurality of stator windings, all of which are arranged in a ring shape; a rotor; a stator winding box; and a replacement device. The magnetic suspension bearing, the control method thereof, the magnetic suspension motor and the new fan provided by the application can replace the damaged stator windings with the replacement device, and the reliable maintenance of the magnetic suspension bearing can be realized by only reducing the rotating speed of the rotor, so that the normal operation of the structure where the magnetic suspension bearing is located is ensured. The problems in the prior art that the device needs to be stopped and manually maintained and the stator windings need to be replaced are overcome, the working efficiency and the maintenance efficiency of the structure where the magnetic suspension bearing is located are effectively improved, the maintenance process and the maintenance difficulty are reduced, the emergency treatment of the magnetic suspension bearing is realized, the magnetic suspension bearing and the magnetic suspension motor are protected, and the safety operation reliability of the structure where the magnetic suspension bearing is located is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, in particular to a magnetic suspension bearing, a control method thereof, a magnetic suspension motor and a new fan. BACKGROUND

[0002] The magnetic suspension motor technology is widely applied to centrifugal compressors and other products due to its high efficiency, low noise and no loss. The stable operation of the high-speed rotating magnetic suspension motor is realized by controlling the coil winding in each direction. However, the smooth operation of the motor will be directly damaged or even destroyed due to unexpected damage of the winding.

[0003] In the prior art, the magnetic suspension motor is directly controlled to stop running after the magnetic suspension bearing is damaged. Moreover, the operator needs to judge, disassemble and replace the damaged winding, which is complicated and low in work efficiency, resulting in low work efficiency of the structure where the magnetic suspension motor is located and long maintenance process, thereby affecting the user experience. SUMMARY

[0004] In order to solve the technical problem that the magnetic suspension bearing needs to be repaired after damage in the prior art, thereby affecting the user experience, a magnetic suspension bearing, a control method thereof, a magnetic suspension motor and a new fan are provided, which can replace the damaged stator winding without stopping running to ensure work efficiency and shorten the maintenance process.

[0005] A magnetic suspension bearing comprises:

[0006] A plurality of stator windings, all of which are arranged in a ring shape.

[0007] A rotor, which is rotatably arranged in the ring-shaped interior.

[0008] A stator winding box, in which a to-be-replaced winding is prearranged.

[0009] A replacement device, which can replace the stator winding with the to-be-replaced winding.

[0010] The magnetic suspension bearing further comprises a winding mounting structure, the rotor is arranged in the winding mounting structure, all of the stator windings are arranged on the winding mounting structure, and the replacement device can move the stator winding on the winding mounting structure into the stator winding box, and the replacement device can also move the to-be-replaced winding in the stator winding box to the winding mounting structure.

[0011] The stator winding is provided with a winding electrode, and the stator winding is electrically connected to the winding mounting structure through the winding electrode.

[0012] The winding installation structure is provided with a first guide rail, and the replacement device can drive any one of the stator windings or any one of the windings to be replaced to move along the first guide rail.

[0013] The stator winding box is provided with a second guide rail, the replacement device can drive the stator winding in the stator winding box to move along the second guide rail, and the second guide rail is connected with the first guide rail.

[0014] The stator winding box comprises a damaged area and a replacement area, the winding to be replaced is arranged in the replacement area, and the second guide rail is connected with the damaged area and the replacement area.

[0015] The magnetic suspension bearing further comprises a detection device, the detection device can obtain the working state of all the stator windings, and the detection device is electrically connected with the replacement device.

[0016] The replacement device comprises a moving motor, the moving motor corresponds to the stator winding one by one, and the stator winding can be moved under the driving of the corresponding moving motor.

[0017] The magnetic suspension bearing further comprises a protection winding, the protection winding is located above the rotor, and the protection winding covers all the stator windings.

[0018] A control method of the above-mentioned magnetic suspension bearing, comprising:

[0019] Step S1, obtaining the working state of all the stator windings, and determining the stator winding in the damaged state as a damaged winding;

[0020] Step S2, controlling the replacement device to work to replace the damaged winding in step S1 with the winding to be replaced.

[0021] The magnetic suspension bearing further comprises a winding installation structure, all the stator windings are arranged on the winding installation structure, and in step S2, further comprising:

[0022] a. moving the damaged winding in step S1 from the winding installation structure to the stator winding box;

[0023] b. moving the winding to be replaced in the stator winding box to the winding installation structure.

[0024] All the stator windings are arranged symmetrically with respect to the axis of the rotor, and before step S2, further comprising:

[0025] Turning off the stator winding opposite to the damaged winding in step S1.

[0026] After step S1, further comprising:

[0027] reducing the rotation speed of the rotor.

[0028] The magnetic bearing further comprises a protection winding, the protection winding is located above the rotor, and the protection winding covers all the stator windings, and further comprising the following steps after step S1:

[0029] obtaining the number n of damaged windings, and comparing n with a preset value n0;

[0030] if n≥n0, controlling the protection winding to work;

[0031] controlling all the stator windings to be closed and performing step S2;

[0032] or, controlling the structure where the magnetic bearing is located to stop.

[0033] The preset value n0 is in the range of 2 to 1 / 2N, and N is the number of all stator windings of the magnetic bearing.

[0034] A magnetic suspension motor comprising the magnetic bearing or applying the control method of the magnetic bearing.

[0035] A new fan comprising the magnetic bearing or applying the control method of the magnetic bearing.

[0036] The magnetic bearing, the control method thereof, the magnetic suspension motor and the new fan provided by the application replace the damaged stator winding with the to-be-replaced winding pair by using the replacing device, and only the rotation speed of the rotor needs to be reduced to realize reliable maintenance of the magnetic bearing, ensure normal operation of the structure where the magnetic bearing is located, overcome the problem in the prior art that the device needs to be stopped and manually maintained and the stator winding needs to be replaced, effectively improve the working efficiency and maintenance efficiency of the structure where the magnetic bearing is located, reduce the maintenance process and difficulty, realize emergency treatment of the magnetic bearing, achieve the purpose of protecting the magnetic bearing and the magnetic suspension motor, and improve the safety operation reliability of the structure where the magnetic bearing is located. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A structural schematic diagram of the magnetic bearing provided by the embodiment of the application is shown in the figure;

[0038] Figure 2 Another structural schematic diagram of the magnetic bearing provided by the embodiment of the application is shown in the figure;

[0039] Figure 3 Another structural schematic diagram of the magnetic bearing provided by the embodiment of the application is shown in the figure;

[0040] Figure 4 A structural schematic diagram of the stator winding box provided by the embodiment of the application is shown in the figure;

[0041] Figure 5 A structure diagram of a stator winding provided for an embodiment of the present application is shown in the figure.

[0042] Figure 6 An exploded view of a fresh air machine provided for an embodiment of the present application is shown in the figure.

[0043] Figure 7 A top view of a fresh air machine provided for an embodiment of the present application is shown in the figure.

[0044] Figure 8 A structure diagram of a protection winding provided for an embodiment of the present application is shown in the figure.

[0045] In the figure:

[0046] 1, stator winding; 2, rotor; 3, stator winding box; 11, winding electrode; 4, first guide rail; 5, second guide rail; 6, moving motor; 7, protection winding. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0048] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0049] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0050] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship of "upper", "lower", "left", "right", "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0051] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The magnetic suspension motor technology is widely used in centrifugal compressors and other products due to its high efficiency, low noise, no loss and other characteristics. Through the control of coil winding in various directions, the magnetic suspension motor running smoothly at high speed. However, due to the damage of winding and other unexpected situations, it will directly damage the smooth operation of the motor and even damage the motor. In the prior art, the magnetic suspension motor is directly controlled to stop after the magnetic suspension bearing is damaged, and the operator needs to judge, disassemble and replace the damaged winding, which is complex and low in work efficiency, causing low work efficiency and long maintenance process of the structure where the magnetic suspension motor is located, affecting the user's experience.

[0053] Therefore, the present application provides a magnetic suspension bearing as shown in Figures 1 to 8 The magnetic suspension bearing comprises: a plurality of stator windings 1, all of which are arranged in a ring shape; a rotor 2 rotatably arranged in the ring-shaped interior; a stator winding box 3, which is pre-provided with a to-be-replaced winding; and a replacement device, which can replace the stator winding 1 with the to-be-replaced winding. The replacement device replaces the damaged stator winding 1 with the to-be-replaced winding, which only needs to reduce the speed of the rotor 2 to realize reliable maintenance of the magnetic suspension bearing, ensure the normal operation of the structure where the magnetic suspension bearing is located, overcome the problem of stopping the equipment and manually repairing and replacing the stator winding 1 in the prior art, effectively improve the work efficiency and maintenance efficiency of the structure where the magnetic suspension bearing is located, reduce the maintenance process and difficulty, realize emergency treatment of the magnetic suspension bearing, achieve the purpose of protecting the magnetic suspension bearing and the magnetic suspension motor, and improve the safety and reliability of the operation of the structure where the magnetic suspension bearing is located.

[0054] When one or more stator windings 1 of a magnetic levitation bearing are damaged, the damaged stator winding 1 cannot provide support for the rotor 2, resulting in uneven force on the rotor 2 and unreliable rotation. Therefore, after identifying the damaged stator winding 1, a replacement device is used to disassemble it, and a replacement winding is retrieved from the stator winding box 3 to replace the disassembled stator winding 1. This achieves the goal of protecting the magnetic levitation bearing and its surrounding structure for safe operation. During this process, only the rotor 2's speed needs to be reduced; there is no need to shut down the magnetic levitation bearing structure, avoiding the need for restarting. This effectively ensures the operational reliability of the magnetic levitation bearing structure and eliminates the need for manual inspection, judgment, and replacement of the stator winding 1, improving the maintenance efficiency of the magnetic levitation bearing and enhancing the user experience.

[0055] The magnetic levitation bearing further includes a winding mounting structure. The rotor 2 is disposed within the winding mounting structure, and all the stator windings 1 are disposed on the winding mounting structure. The replacement device can move the stator windings 1 on the winding mounting structure to the stator winding box 3. The replacement device can also move the windings to be replaced in the stator winding box 3 to the winding mounting structure. The stator windings 1 are distributed around the outer periphery of the rotor 2 through the winding mounting structure, ensuring that the distribution of the stator windings 1 can reliably support the rotor 2. The replacement device can also be programmed with a preset path, thereby ensuring the reliability of the replacement device in replacing the stator windings 1. Figure 1 and 2 As shown, the stator winding 1 on the arc-shaped guide rail on the right side of the figure is the damaged stator winding, and this stator winding is in the process of being moved by the replacement device.

[0056] The stator winding 1 is provided with a winding electrode 11. The stator winding 1 is electrically connected to the winding mounting structure through the winding electrode 11. By providing the winding electrode 11, a quick-release connection between the winding mounting structure and the stator winding 1 is realized. At this time, the stator winding 1 can be directly removed from the winding mounting structure and taken away by the replacement device. The replacement winding that has been moved to the preset position by the replacement device can also be quickly installed on the winding mounting structure and can reliably be energized to generate a magnetic field, thereby ensuring the reliability of the magnetic levitation bearing.

[0057] Preferably, the winding mounting structure is provided with a first guide rail 4, and the replacement device can drive any one of the stator windings 1 or any one of the windings to be replaced to move along the first guide rail 4. The movement path of the winding is limited by the first guide rail 4, and the damaged stator winding 1 can move along the first guide rail 4 to the stator winding box 3. Similarly, the winding to be replaced in the stator winding box 3 can move to the removed stator winding 1 through the first guide rail 4, so as to ensure the reliable replacement of the winding by the replacement device. Since the stator windings 1 are arranged in the form of surrounding the rotor 2, the first guide rail 4 is annular, that is, the first guide rail 4 passes through the mounting positions of all the stator windings 1, so that each stator winding 1 can directly enter the first guide rail 4 at the mounting position to move, thereby facilitating the replacement of the stator winding 1.

[0058] Preferably, the first guide rail 4 further comprises an avoiding section, one end of the avoiding section is connected with the annular guide rail section, and the damaged stator winding 1 moves to the avoiding section through the annular guide rail, and then moves to the stator winding box 3 through the avoiding section. The avoiding section is used to avoid the winding mounting structure, the rotor 2 and other stator windings 1 during the movement of the stator winding 1, so as to ensure the reliability of the movement of the stator winding 1. Preferably, the avoiding section is arc-shaped, the arc-shaped section passes through the axis of the rotor 2, and the arc-shaped section protrudes away from the rotor 2, so as to ensure the avoiding effect of the stator winding 1 on the rotor 2.

[0059] The stator winding box 3 is provided with a second guide rail 5, the replacement device can drive the stator winding 1 in the stator winding box 3 to move along the second guide rail 5, and the second guide rail 5 is connected with the first guide rail 4. The second guide rail 5 is used to facilitate the movement of the damaged stator winding 1 to the stator winding box 3 for storage, and also can facilitate the movement of the winding to be replaced in the stator winding box 3 to the first guide rail 4, and finally move to the removed stator winding 1 through the second guide rail 5 for replacement.

[0060] The stator winding box 3 includes a damaged area and a replacement area, the replacement area is provided with the winding to be replaced, and the second guide rail 5 is connected with the damaged area and the replacement area. The damaged stator winding 1 is received in the damaged area, and the winding to be replaced is stored in the replacement area. The damaged stator winding 1 can enter the damaged area along the second guide rail 5, and the winding to be replaced can be moved to the first guide rail 4 along the second guide rail 5 to replace the winding around the rotor 2. Preferably, the damaged area and the replacement area are distributed along the length direction of the stator winding box 3, and the second guide rail 5 is in the shape of a cross. The length section of the cross-shaped second guide rail 5 is arranged along the length direction of the stator winding box 3 and can communicate with the damaged area and the replacement area respectively. The width section of the cross-shaped second guide rail 5 is arranged along the width direction of the stator winding box 3 and can place the damaged stator winding 1 at different positions of the damaged area and can also facilitate the acquisition of different windings to be replaced in the replacement area. Thus, the magnetic suspension bearing can allow the damage of multiple stator windings 1 and improve the reliability of the magnetic suspension bearing.

[0061] The magnetic suspension bearing further comprises a detection device capable of acquiring the working states of all the stator windings 1, and the detection device is electrically connected with the replacement device. The detection device can determine whether the winding around the rotor 2 is damaged, and can control the replacement device to replace the damaged winding according to the detection result.

[0062] As an implementation manner, the replacement device comprises a moving motor 6 corresponding to each stator winding 1, and the stator winding 1 can be moved under the driving of the corresponding moving motor 6. The moving motor 6 is used to move the stator winding 1. The moving motor 6 is connected with the winding to be replaced in the stator winding box 3 after the damaged stator winding 1 is moved into the stator winding box 3, so as to move the winding to be replaced.

[0063] The magnetic suspension bearing further comprises a protection winding 7 located above the rotor 2 and covering all the stator windings 1. When too many stator windings 1 around the rotor 2 are damaged, the working stator windings 1 cannot guarantee the rotation of the rotor 2. At this time, the protection winding 7 is started to generate a magnetic force to suspend the rotor 2. The rotation of the rotor 2 is stopped, and then all the damaged stator windings 1 are replaced in sequence, thereby further improving the reliability of the magnetic suspension bearing.

[0064] A control method of the magnetic suspension bearing, comprising:

[0065] Step S1, obtaining the working state of all stator windings 1, and determining the stator winding 1 in a damaged state as a damaged winding, wherein the damage of the stator winding 1 can be determined according to its current value, etc.

[0066] Step S2, controlling the replacement device to work to replace the damaged winding in step S1 with a standby winding. The damaged stator winding 1 is disassembled by the replacement device, and the standby winding in the stator winding box 3 is used to replace the disassembled stator winding 1, achieving the purpose of protecting the safe operation of the magnetic suspension bearing and the structure thereof. In this process, only the speed of the rotor 2 needs to be reduced, and the magnetic suspension bearing structure does not need to be shut down for processing, avoiding the problem that the magnetic suspension bearing structure needs to be restarted, effectively ensuring the working reliability of the magnetic suspension bearing structure, and avoiding the need for an operator to detect and replace the stator winding 1 in the prior art, improving the maintenance efficiency of the magnetic suspension bearing and improving user experience.

[0067] Specifically, the magnetic suspension bearing further comprises a winding mounting structure, and all the stator windings 1 are arranged on the winding mounting structure. In step S2, further comprising:

[0068] a. moving the damaged winding in step S1 from the winding mounting structure to the stator winding box 3;

[0069] b. moving the standby winding in the stator winding box 3 to the winding mounting structure, that is, first disassembling the damaged stator winding 1, and then placing the disassembled stator winding 1 in the stator winding box 3 for storage, and then moving the good standby winding to the position of the disassembled stator winding 1 for installation, so as to complete the replacement of the winding.

[0070] All the stator windings 1 are arranged symmetrically in pairs with the axis of the rotor 2 as the axis. Before step S2, further comprising:

[0071] The two symmetrical stator windings 1 generate forces in opposite directions to support the rotor 2 when generating magnetic fields, and when one of the stator windings 1 is damaged, the support force generated by the opposite stator winding 1 will cause the rotor 2 to deviate, therefore, the stator winding 1 opposite to the damaged winding in step S1 is closed, thereby ensuring the stability of the rotation of the rotor 2, and allowing the rotor 2 to rotate at a low speed while replacing the stator winding 1, achieving the purpose of maintenance without stopping, overcoming the problem of the prior art that the device needs to be stopped and manually repaired and replaced with the stator winding 1, effectively improving the working efficiency and maintenance efficiency of the structure with the magnetic suspension bearing, reducing the maintenance process and difficulty, achieving emergency processing of the magnetic suspension bearing, achieving the purpose of protecting the magnetic suspension bearing and the magnetic suspension motor, and improving the safety and reliability of the structure with the magnetic suspension bearing.

[0072] After step S1, further comprising:

[0073] The rotation speed of the rotor 2 is reduced to avoid the rotor 2 from generating a large deviation, further ensuring the reliability of the magnetic suspension bearing, and reducing the rotation speed of the rotor 2 without stopping the rotation of the rotor 2, so that the structure with the magnetic suspension bearing can still rotate without stopping, avoiding the problem of restarting the structure with the magnetic suspension bearing, and reducing the energy consumption of the structure with the magnetic suspension bearing.

[0074] The magnetic suspension bearing further comprises a protection winding 7, the protection winding 7 is located above the rotor 2, and the protection winding 7 covers all the stator windings 1, and after step S1, further comprising:

[0075] The number n of damaged windings is obtained, and n is compared with a preset value n0;

[0076] If n≥n0, it is determined that the stator winding 1 that can normally work around the rotor 2 cannot guarantee the rotation of the rotor 2 at this time, and the protection winding 7 is controlled to work at this time, and the protection winding 7 generates a magnetic field to support the rotor 2, avoiding the rotor 2 from colliding with the structure below the rotor 2 under the action of gravity, and ensuring the reliability of the magnetic suspension bearing;

[0077] All stator windings 1 are controlled to be closed and step S2 is executed, so that the damaged stator windings 1 are replaced, overcoming the problem of the prior art that the device needs to be stopped and manually repaired and replaced with the stator winding 1, effectively improving the working efficiency and maintenance efficiency of the structure with the magnetic suspension bearing, reducing the maintenance process and difficulty, achieving emergency processing of the magnetic suspension bearing, achieving the purpose of protecting the magnetic suspension bearing and the magnetic suspension motor, and improving the safety and reliability of the structure with the magnetic suspension bearing.

[0078] Or, the number n of damaged windings is obtained, and n is compared with a preset value n0;

[0079] If n≥n0, it is determined that the stator windings 1 surrounding the rotor 2 and capable of normal operation cannot guarantee the rotation of the rotor 2, and the protection winding 7 is controlled to work, and a magnetic field generated by the protection winding 7 is used to support the rotor 2, so as to avoid the rotor 2 from colliding with the structure below the rotor 2 under the action of gravity, and the reliability of the magnetic suspension bearing is ensured.

[0080] Then, the structure where the magnetic suspension bearing is located is controlled to stop, and an operator needs to confirm whether the structure where the magnetic suspension bearing is located can work, so as to ensure the safety of production and use.

[0081] The preset value n0 is in a range of 2 to 1 / 2N, and N is the number of all stator windings 1 of the magnetic suspension bearing. That is, when the stator windings 1 surrounding the rotor 2 are damaged by half, it is determined that the rotor 2 cannot be reliably supported, and the protection winding 7 needs to be started to protect the rotor 2 and the magnetic suspension bearing. For example, the number of the stator windings 1 surrounding the rotor 2 is 8 (4 pairs), when the number n of damaged stator windings 1 is 1 to 3, the protection winding 7 can not be started, and only the rotor 2 speed is reduced and the stator windings 1 are replaced, and when the number n of damaged stator windings 1 is more than 3, the protection winding 7 is started, and the rotor 2 is controlled to stop, and then the stator windings 1 are replaced or wait for the command of the operator.

[0082] A magnetic suspension motor comprising the magnetic suspension bearing or applying the control method of the magnetic suspension bearing. Preferably, the magnetic field range generated by the protection winding 7 can cover the entire magnetic suspension motor, so as to ensure the reliability of the magnetic suspension motor.

[0083] A new fan comprising the magnetic suspension bearing or applying the control method of the magnetic suspension bearing.

[0084] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A magnetic levitation bearing, characterized in that: include: Multiple stator windings (1), all of which are arranged in a ring shape; Rotor (2), which is rotatably disposed inside the annulus; Stator winding box (3), wherein a winding to be replaced is pre-set in the stator winding box (3); A replacement device that can replace the stator winding (1) using the winding to be replaced; The magnetic levitation bearing also includes a winding mounting structure. The rotor (2) is disposed in the winding mounting structure. All the stator windings (1) are disposed on the winding mounting structure. The replacement device can move the stator windings (1) on the winding mounting structure to the stator winding box (3). The replacement device can also move the winding to be replaced in the stator winding box (3) to the winding mounting structure. The winding mounting structure is provided with a first guide rail (4), and the replacement device can drive any one of the stator windings (1) or any one of the windings to be replaced to move along the first guide rail (4). The stator winding box (3) is provided with a second guide rail (5). The replacement device can drive the stator winding (1) in the stator winding box (3) to move along the second guide rail (5), and the second guide rail (5) is connected to the first guide rail (4).

2. The magnetic levitation bearing according to claim 1, characterized in that: The stator winding (1) is provided with a winding electrode (11), and the stator winding (1) is electrically connected to the winding mounting structure through the winding electrode (11).

3. The magnetic levitation bearing according to claim 1, characterized in that: The stator winding box (3) includes a damaged area and a replacement area. The replacement area contains the winding to be replaced. The second guide rail (5) is connected to both the damaged area and the replacement area.

4. The magnetic levitation bearing according to claim 1, characterized in that: The magnetic levitation bearing also includes a detection device, which is capable of acquiring the working status of all the stator windings (1), and the detection device is electrically connected to the replacement device.

5. The magnetic levitation bearing according to claim 1, characterized in that: The replacement device includes a moving motor (6), which corresponds one-to-one with the stator winding (1), and the stator winding (1) can move under the drive of the corresponding moving motor (6).

6. The magnetic levitation bearing according to claim 1, characterized in that: The magnetic levitation bearing also includes a protective winding (7) located above the rotor (2) and covering all the stator windings (1).

7. A control method for a magnetic levitation bearing according to any one of claims 1 to 6, characterized in that: include: Step S1: Obtain the working status of all stator windings (1) and identify the stator windings (1) that are in a damaged state as damaged windings; Step S2: Control the replacement device to operate so as to replace the damaged winding in step S1 with the winding to be replaced.

8. The control method for a magnetic levitation bearing according to claim 7, characterized in that: The magnetic levitation bearing further includes a winding mounting structure, on which all the stator windings (1) are mounted. In step S2, the bearing further includes: a. Move the damaged winding from the winding mounting structure in step S1 to the stator winding box (3); b. Move the winding to be replaced in the stator winding box (3) to the winding mounting structure.

9. The control method for a magnetic levitation bearing according to claim 7, characterized in that: All the stator windings (1) are arranged symmetrically in pairs with the axis of the rotor (2) as the axis. Before step S2, the method further includes: Close the stator winding (1) opposite to the damaged winding in step S1.

10. The control method for a magnetic levitation bearing according to claim 7, characterized in that: Following step S1, the following is also included: Reduce the speed of rotor (2).

11. The control method for a magnetic levitation bearing according to claim 7, characterized in that: The magnetic levitation bearing further includes a protective winding (7) located above the rotor (2) and covering all the stator windings (1). After step S1, the bearing further includes: Obtain the number of damaged windings n, and compare n with the preset value n0; If n≥n0, then the control protection winding (7) will work; Control all stator windings (1) to shut down and execute step S2; Alternatively, the structure containing the magnetic levitation bearing may be shut down.

12. The control method for a magnetic levitation bearing according to claim 11, characterized in that: The preset value n0 ranges from 2 to 1 / 2N, where N is the number of all stator windings (1) of the magnetic levitation bearing.

13. A magnetic levitation motor, characterized in that: The magnetic bearing includes any one of claims 1 to 6, or the control method for the magnetic bearing described in any one of claims 7 to 12.

14. A fresh air ventilator, characterized in that: The magnetic bearing includes any one of claims 1 to 6, or the control method for the magnetic bearing described in any one of claims 7 to 12.

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