Magnetic suspension bearing and control method thereof, magnetic suspension motor and fresh air ventilator

Abstract

The invention provides a magnetic suspension bearing and a control method thereof, a magnetic suspension motor and a fresh air ventilator. The magnetic suspension bearing comprises a plurality of stator windings which are annularly distributed; a rotor; a stator winding box; and replacing the device. According to the magnetic suspension bearing and the control method thereof, the magnetic suspension motor and the fresh air ventilator, the damaged stator winding of the winding to be replaced is replaced through the replacement device, reliable maintenance of the magnetic suspension bearing can be achieved only by reducing the rotating speed of the rotor, normal operation of the structure where the magnetic suspension bearing is located is guaranteed, and the service life of the magnetic suspension bearing is prolonged. The problem that equipment needs to be shut down and a stator winding needs to be manually overhauled and replaced in the prior art is solved, the working efficiency and the overhaul efficiency of the structure where the magnetic suspension bearing is located are effectively improved, the maintenance process and the maintenance difficulty are reduced, emergency treatment on the magnetic suspension bearing is achieved, and the purpose of protecting the magnetic suspension bearing and a magnetic suspension motor is achieved. And the safe operation reliability of the structure of the magnetic suspension bearing is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a magnetic suspension bearing and a control method thereof, a magnetic suspension motor, and a fresh air blower. Background Art

[0002] Magnetic levitation motor technology is widely used in centrifugal compressors and other products due to its high efficiency, low noise, and zero loss. By controlling the coil windings in all directions, the high-speed rotating magnetic levitation motor runs smoothly. However, the occurrence of unexpected situations such as winding damage will directly disrupt the smooth operation of the motor or even damage the motor.

[0003] In the prior art, the magnetic levitation motor is directly shut down after the magnetic levitation bearing is damaged, and the operator is required to identify, disassemble and replace the damaged winding. The operation is complicated and the work efficiency is low, resulting in low work efficiency and a long maintenance process for the structure where the magnetic levitation motor is located, affecting the user experience. Summary of the invention

[0004] In order to solve the technical problem in the prior art that damaged magnetic bearings require shutdown for maintenance, which affects the user experience, a magnetic bearing and its control method, a magnetic motor, and a fresh air fan are provided, which utilize a replacement device to replace damaged stator windings without stopping the machine to ensure work efficiency and shorten the maintenance process.

[0005] A magnetic suspension bearing, comprising:

[0006] A plurality of stator windings, all of the stator windings are arranged in a ring-shaped distribution;

[0007] A rotor rotatably disposed inside the ring;

[0008] A stator winding box, wherein the stator winding box is preset with a winding to be replaced;

[0009] A replacement device is provided, wherein the replacement device can replace the stator winding with the winding to be replaced.

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

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

[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] A second guide rail is arranged in the stator winding box, and 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 to the first guide rail.

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

[0015] The magnetic bearing further comprises a detection device, which is capable of acquiring the working status of all the stator windings, and the detection device is electrically connected to the replacement device.

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

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

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

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

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

[0021] The magnetic bearing further includes a winding installation structure, and all the stator windings are arranged on the winding installation structure. In step S2, it also includes:

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

[0023] b. Move the winding to be replaced in the stator winding box to the winding mounting structure.

[0024] All the stator windings are symmetrically arranged in pairs with the axis of the rotor as the axis, and before step S2, the method further includes:

[0025] The stator winding opposite to the damaged winding in step S1 is turned off.

[0026] After step S1, the method further includes:

[0027] Reduce the rotor speed.

[0028] The magnetic bearing further includes a protection winding, which is located above the rotor and covers all the stator windings. After step S1, the method further includes:

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

[0030] If n≥n0, the protection winding is controlled to work;

[0031] Control all stator windings to close and execute step S2;

[0032] Or, the structure where the magnetic bearing is located is controlled to shut down.

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

[0034] A magnetic levitation motor comprises the above-mentioned magnetic levitation bearing or a control method using the above-mentioned magnetic levitation bearing.

[0035] A new air blower comprises the above-mentioned magnetic suspension bearing or a control method using the above-mentioned magnetic suspension bearing.

[0036] The magnetic bearing and its control method, magnetic motor and fresh air blower provided by the present invention utilize a replacement device to replace the damaged stator winding with the winding to be replaced. The magnetic bearing can be reliably repaired only by reducing the rotation speed of the rotor, thereby ensuring the normal operation of the structure where the magnetic bearing is located. The problem in the prior art that the equipment needs to be shut down for manual maintenance and replacement of the stator winding is overcome, and the working efficiency and maintenance efficiency of the structure where the magnetic bearing is located are effectively improved, the maintenance process and the difficulty of maintenance are reduced, and emergency treatment of the magnetic bearing is realized, thereby achieving the purpose of protecting the magnetic bearing and the magnetic motor and improving the safe operation reliability of the structure where the magnetic bearing is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of a magnetic bearing provided by an embodiment of the present invention;

[0038] Figure 2 Another schematic diagram of the structure of the magnetic bearing provided by an embodiment of the present invention;

[0039] Figure 3 Another schematic diagram of the structure of the magnetic bearing provided by an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the structure of a stator winding box provided in an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the structure of a stator winding provided in an embodiment of the present invention;

[0042] Figure 6 An exploded view of a new air fan provided by an embodiment of the present invention;

[0043] Figure 7 A top view of a fresh air fan provided by an embodiment of the present invention;

[0044] Figure 8 A schematic diagram of the structure of a protection winding provided in an embodiment of the present invention;

[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. Mobile motor; 7. Protective winding. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

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

[0050] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Magnetic levitation motor technology is widely used in many products such as centrifugal compressors due to its high efficiency, low noise, and no loss. The high-speed rotating magnetic levitation motor runs smoothly through coil winding control in all directions. However, unexpected situations such as winding damage will directly disrupt the smooth operation of the motor or even damage the motor. In the existing technology, the magnetic levitation motor is directly controlled to shut down after the magnetic levitation bearing is damaged, and the operator is required to judge, disassemble and replace the damaged winding. The operation is complicated and the work efficiency is low, resulting in low work efficiency and long maintenance process of the structure where the magnetic levitation motor is located, affecting the user experience.

[0053] To this end, the present application provides a Figures 1 to 8 The magnetic bearing shown comprises: a plurality of stator windings 1, all of which are arranged in an annular distribution; a rotor 2, which is rotatably arranged inside the annular ring; a stator winding box 3, in which a winding to be replaced is preset; and a replacement device, which can replace the stator winding 1 with the winding to be replaced. The replacement device is used to replace the damaged stator winding 1 with the winding to be replaced, and the magnetic bearing can be reliably repaired by only reducing the rotation speed of the rotor 2, ensuring the normal operation of the structure where the magnetic bearing is located, overcoming the problem in the prior art that the equipment needs to be shut down and manually inspected and replaced with the stator winding 1, effectively improving the working efficiency and inspection efficiency of the structure where the magnetic bearing is located, reducing the maintenance process and the difficulty of maintenance, realizing the emergency treatment of the magnetic bearing, achieving the purpose of protecting the magnetic bearing and the magnetic motor, and improving the safety and reliability of the structure where the magnetic bearing is located.

[0054] When one or more stator windings 1 of the magnetic bearing are damaged, the damaged stator winding 1 cannot generate supporting force for the rotor 2, and the rotor 2 is unevenly stressed and has the problem of unreliable rotation. Therefore, after determining the damaged stator winding 1, the damaged stator winding 1 is disassembled by using a replacement device, and the winding to be replaced is obtained from the stator winding box 3 to replace the disassembled stator winding 1, so as to achieve the purpose of protecting the safe operation of the magnetic bearing and the structure where the magnetic bearing is located. In this process, it is only necessary to reduce the rotation speed of the rotor 2, and there is no need to shut down the structure where the magnetic bearing is located, thereby avoiding the problem that the structure where the magnetic bearing is located needs to be restarted, effectively ensuring the working reliability of the structure where the magnetic bearing is located, and avoiding manual detection, judgment and replacement of the stator winding 1, thereby improving the maintenance efficiency of the magnetic bearing and improving user experience.

[0055] Wherein, the magnetic bearing also includes a winding installation structure, the rotor 2 is arranged in the winding installation structure, all the stator windings 1 are arranged on the winding installation structure, and the replacement device can move the stator winding 1 on the winding installation structure to the stator winding box 3, and the replacement device can also move the winding to be replaced in the stator winding box 3 to the winding installation structure. The stator winding 1 is distributed on the periphery of the rotor 2 through the winding installation structure to ensure that the distribution of the stator winding 1 can reliably support the rotor 2, and the replacement device can also preset a path to ensure the reliability of the replacement device in replacing the stator winding 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 a 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, and 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 achieved. At this time, the stator winding 1 can be directly removed from the winding mounting structure and taken away by the replacement device, and the winding to be replaced that has been moved to a preset position by the replacement device can also be quickly installed on the winding mounting structure, and can reliably obtain electricity to generate a magnetic field, thereby ensuring the reliability of the magnetic suspension bearing.

[0057] Preferably, the winding installation 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 first guide rail 4 is used to limit the movement path of the winding, and the damaged stator winding 1 can move along the first guide rail 4 toward the stator winding box 3. Similarly, the winding to be replaced in the stator winding box 3 can be moved to the removed stator winding 1 through the first guide rail 4, ensuring that the replacement device can replace the winding reliably. Since the stator winding 1 is distributed in the form of surrounding the rotor 2, the shape of the first guide rail 4 is annular, that is, the first guide rail 4 passes through the installation positions of all stator windings 1, so that each stator winding 1 can directly enter the first guide rail 4 at its installation position for movement, thereby facilitating the replacement of the stator winding 1.

[0058] The first guide rail 4 further includes an avoidance section, one end of which is connected to the annular guide rail portion. The damaged stator winding 1 is moved to the avoidance section through the annular guide rail, and then moved to the stator winding box 3 through the avoidance section. The avoidance section enables the stator winding 1 to avoid the winding installation structure, the rotor 2 and other stator windings 1 during the movement, thereby ensuring the movement reliability of the stator winding 1. Preferably, the avoidance section is in the shape of an arc, which passes through the axis of the rotor 2 and bulges in the direction away from the rotor 2, thereby ensuring the avoidance effect of the stator winding 1 on the rotor 2.

[0059] The stator winding box 3 is provided with a second guide rail 5, and 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. The second guide rail 5 facilitates the damaged stator winding 1 to be moved to the stator winding box 3 for storage, and also facilitates the winding to be replaced in the stator winding box 3 to be moved to the first guide rail 4, and finally moved to the disassembled 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 to both the damaged area and the replacement area. The damaged stator winding 1 is stored in the damaged area, and the replacement area stores the pre-stored winding to be replaced. The damaged stator winding 1 can enter the damaged area along the second guide rail 5, and the winding to be replaced is moved along the second guide rail 5 to the first guide rail 4 for replacement, thereby realizing the replacement of the winding surrounding the rotor 2. Preferably, the damaged zone and the replacement zone are distributed along the length direction of the stator winding box 3, and the second guide rail 5 is cross-shaped. The cross-shaped second guide rail 5 includes a length segment and a width segment. The length segment is arranged along the length direction of the stator winding box 3 and can be connected with the damaged zone and the replacement zone respectively, while the width segment is arranged along the width direction of the stator winding box 3, and the damaged stator winding 1 can be placed at different positions in the damaged zone, and different windings to be replaced in the replacement zone can also be easily obtained, so that the magnetic bearing can allow damage to multiple stator windings 1, thereby improving the reliability of the magnetic bearing.

[0061] The magnetic bearing further comprises a detection device, which can obtain the working status of all the stator windings 1, and the detection device is electrically connected to the replacement device. The detection device is used to determine whether the windings around the rotor 2 are damaged, and the replacement device can be controlled to replace the damaged windings according to the detection results.

[0062] As an embodiment, the replacement device includes a moving motor 6, and the moving motor 6 corresponds to the stator winding 1 one by one, and the stator winding 1 can be moved under the drive of the corresponding moving motor 6. The movement of the stator winding 1 is achieved by the drive of the moving motor 6, wherein the winding to be replaced in the stator winding box 3 is also provided with a moving motor 6, or the moving motor 6 can be connected with the winding to be replaced in the stator winding box 3 after moving the damaged stator winding 1 into the stator winding box 3, so as to achieve the movement of the winding to be replaced.

[0063] The magnetic bearing further includes a protective winding 7, which is located above the rotor 2 and covers all the stator windings 1. When the stator windings 1 surrounding the rotor 2 are damaged too much, the working stator windings 1 can no longer guarantee the rotation of the rotor 2. At this time, the protective winding 7 is started, and the magnetic force generated by the protective winding 7 is used to suspend the rotor 2. At this time, the rotor 2 is controlled to stop rotating, and then all damaged stator windings 1 can be replaced in sequence, thereby further ensuring the reliability of the magnetic bearing.

[0064] A control method of the above-mentioned magnetic suspension bearing comprises:

[0065] Step S1, obtaining the working status 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 based on its current value, etc.;

[0066] Step S2, control the replacement device to work so as to replace the damaged winding in step S1 with the winding to be replaced. The damaged stator winding 1 is disassembled by using the replacement device, and the winding to be replaced is obtained from the stator winding box 3 to replace the stator winding 1 that has been disassembled, so as to achieve the purpose of protecting the safe operation of the magnetic suspension bearing and the structure where the magnetic suspension bearing is located. In this process, it is only necessary to reduce the rotation speed of the rotor 2, and there is no need to shut down the structure where the magnetic suspension bearing is located, thus avoiding the problem that the structure where the magnetic suspension bearing is located needs to be restarted, effectively ensuring the working reliability of the structure where the magnetic suspension bearing is located, and avoiding the need for operators to detect, judge and replace the stator winding 1 in the prior art, thereby improving the maintenance efficiency of the magnetic suspension bearing and improving the user experience.

[0067] Specifically, the magnetic bearing further includes a winding installation structure, and all the stator windings 1 are arranged on the winding installation structure. In step S2, it also includes:

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

[0069] b. Move the winding to be replaced in the stator winding box 3 to the winding installation structure, that is, first remove the damaged stator winding 1, and put the removed stator winding 1 into the stator winding box 3 for storage, and then move the good winding to be replaced to the position of the removed stator winding 1 for installation, and the replacement of the winding can be completed.

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

[0071] When the stator winding 1 generates a magnetic field, the two symmetrical stator windings 1 will generate two forces in completely opposite directions to support the rotor 2. When one of the stator windings 1 is damaged, the supporting force generated by the other 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 to ensure the rotation stability of the rotor 2. It can also ensure that when there is a damaged stator winding 1, the rotor 2 is allowed to rotate at a low speed while the stator winding 1 is replaced, thereby achieving the purpose of non-stop maintenance, overcoming the problem of the prior art that the equipment needs to be shut down for manual maintenance and replacement of the stator winding 1, effectively improving the working efficiency and maintenance efficiency of the structure where the magnetic suspension bearing is located, reducing the maintenance process and maintenance difficulty, realizing emergency treatment of the magnetic suspension bearing, achieving the purpose of protecting the magnetic suspension bearing and the magnetic suspension motor, and improving the safe operation reliability of the structure where the magnetic suspension bearing is located.

[0072] After step S1, the method further includes:

[0073] The rotation speed of the rotor 2 is reduced. By reducing the rotation speed of the rotor 2, a large deviation of the rotor 2 is avoided, thereby further ensuring the reliability of the magnetic bearing. At the same time, reducing the rotation speed of the rotor 2 does not require stopping the rotation of the rotor 2, so that the structure where the magnetic bearing is located can still rotate to a certain extent without stopping, avoiding the problem of restarting the structure where the magnetic bearing is located, and reducing the energy consumption of the structure where the magnetic bearing is located.

[0074] The magnetic bearing further includes a protective winding 7, which is located above the rotor 2 and covers all the stator windings 1. After step S1, the method further includes:

[0075] Obtain the number n of damaged windings, and compare n with a preset value n0;

[0076] If n≥n0, it is determined that the stator winding 1 that surrounds the rotor 2 and can work normally can no longer guarantee the rotation of the rotor 2. At this time, the protection winding 7 is controlled to work, and the protection winding 7 is used to generate a magnetic field to support the rotor 2, so as to prevent the rotor 2 from colliding with the structure below the rotor 2 due to the effect of gravity, thereby ensuring the reliability of the magnetic bearing;

[0077] All stator windings 1 are controlled to be closed and step S2 is executed, so that all damaged stator windings 1 are replaced, which overcomes the problem in the prior art that the equipment needs to be shut down for manual maintenance and replacement of the stator windings 1, effectively improves the working efficiency and maintenance efficiency of the structure where the magnetic levitation bearing is located, reduces the maintenance process and maintenance difficulty, realizes emergency treatment of the magnetic levitation bearing, achieves the purpose of protecting the magnetic levitation bearing and the magnetic levitation motor, and improves the safe operation reliability of the structure where the magnetic levitation bearing is located.

[0078] Alternatively, 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 winding 1 that surrounds the rotor 2 and can work normally can no longer guarantee the rotation of the rotor 2. At this time, the protection winding 7 is controlled to work, and the protection winding 7 is used to generate a magnetic field to support the rotor 2, so as to prevent the rotor 2 from colliding with the structure below the rotor 2 due to the effect of gravity, thereby ensuring the reliability of the magnetic bearing;

[0080] Then the structure where the magnetic bearing is located is controlled to shut down. At this time, the operator is required to confirm whether the structure where the magnetic bearing is located can work to ensure the safety of production and use.

[0081] The numerical range of the preset value n0 is 2 to 1 / 2N, where N is the number of all stator windings 1 of the magnetic bearing. That is, when half of the stator windings 1 surrounding the rotor 2 are damaged, it can be determined that the rotor 2 cannot be reliably supported at this time, and the protective winding 7 needs to be started to protect the rotor 2 and the magnetic bearing. For example, the number of stator windings 1 surrounding the rotor 2 is 8 (4 pairs). When the number of damaged stator windings 1 n is 1 to 3, the protective winding 7 can be left unactivated and only the speed of the rotor 2 can be reduced and the stator winding 1 can be replaced. When the number of damaged stator windings 1 n exceeds 3, the protective winding 7 is started, and the rotor 2 is controlled to stop rotating, and then the stator winding 1 is replaced or the operator's command is waited for.

[0082] A magnetic levitation motor comprises the above-mentioned magnetic levitation bearing or a control method using the above-mentioned magnetic levitation bearing. Preferably, the magnetic field generated by the protection winding 7 can cover the entire magnetic levitation motor, thereby ensuring the reliability of the magnetic levitation motor.

[0083] A new air blower comprises the above-mentioned magnetic suspension bearing or a control method using the above-mentioned magnetic suspension bearing.

[0084] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A magnetic bearing, characterized in that: include: A plurality of stator windings (1), all of the stator windings (1) being arranged in a ring-shaped distribution; A rotor (2), the rotor (2) being rotatably arranged inside the ring; A stator winding box (3), wherein the stator winding box (3) is preset with a winding to be replaced; A replacement device is provided, wherein the replacement device is capable of replacing the stator winding (1) with the winding to be replaced.

2. The magnetic bearing according to claim 1, characterized in that: The magnetic bearing also includes a winding installation structure, the rotor (2) is arranged in the winding installation structure, all the stator windings (1) are arranged on the winding installation structure, and the replacement device can move the stator winding (1) on the winding installation structure into the stator winding box (3), and the replacement device can also move the winding to be replaced in the stator winding box (3) to the winding installation structure.

3. The magnetic bearing according to claim 2, 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 via the winding electrode (11).

4. The magnetic bearing according to claim 2, characterized in that: A first guide rail (4) is provided on the winding installation structure, 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).

5. The magnetic bearing according to claim 4, characterized in that: A second guide rail (5) is provided in the stator winding box (3), and 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).

6. The magnetic bearing according to claim 5, characterized in that: The stator winding box (3) comprises 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 to both the damaged area and the replacement area.

7. The magnetic bearing according to claim 1, characterized in that: The magnetic bearing further comprises 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.

8. The magnetic bearing according to claim 1, characterized in that: The replacement device comprises a moving motor (6), the moving motor (6) corresponds to the stator winding (1) one by one, and the stator winding (1) can be moved under the drive of the corresponding moving motor (6).

9. The magnetic bearing according to claim 1, characterized in that: The magnetic bearing further comprises a protective winding (7), wherein the protective winding (7) is located above the rotor (2), and the protective winding (7) covers all the stator windings (1).

10. A control method for a magnetic bearing according to any one of claims 1 to 9, characterized in that: include: Step S1, obtaining the working status of all stator windings (1), and determining the stator winding (1) in a damaged state as a damaged winding; Step S2, controlling the replacement device to work so as to replace the damaged winding in step S1 with the winding to be replaced.

11. The control method of the magnetic bearing according to claim 10, characterized in that: The magnetic bearing further comprises a winding mounting structure, and all the stator windings (1) are arranged on the winding mounting structure. In step S2, the step further comprises: a. moving the damaged winding in step S1 from the winding mounting structure to the stator winding box (3); b. Move the winding to be replaced in the stator winding box (3) to the winding installation structure.

12. The control method of the magnetic bearing according to claim 10, characterized in that: All the stator windings (1) are symmetrically arranged in pairs with the axis of the rotor (2) as the axis, and before step S2, the method further comprises: The stator winding (1) opposite to the damaged winding in step S1 is turned off.

13. The control method of the magnetic bearing according to claim 10, characterized in that: After step S1, the method further includes: Reduce the speed of the rotor (2).

14. The control method of the magnetic bearing according to claim 10, characterized in that: The magnetic bearing further comprises a protective winding (7), wherein the protective winding (7) is located above the rotor (2), and the protective winding (7) covers all the stator windings (1), and after step S1, further comprises: Obtain the number n of damaged windings, and compare n with a preset value n0; If n≥n0, the protection winding (7) is controlled to operate; Control all stator windings (1) to close and execute step S2; Or, the structure where the magnetic bearing is located is controlled to shut down.

15. The control method of the magnetic bearing according to claim 14, characterized in that: The numerical range of the preset value n0 is 2 to 1 / 2N, where N is the number of all stator windings (1) of the magnetic bearing.

16. A magnetic levitation motor, characterized in that: A control method comprising the magnetic bearing according to any one of claims 1 to 9 or applying the magnetic bearing according to any one of claims 10 to 15.

17. A new air blower, characterized in that: A control method comprising the magnetic bearing according to any one of claims 1 to 9 or applying the magnetic bearing according to any one of claims 10 to 15.

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