A magnetic levitation motor

Abstract

This disclosure provides a magnetic levitation motor, comprising: a motor rotor; a reduction stator configured to, after the magnetic levitation motor switches from a first preset state to a second preset state, apply a magnetic field force in a preset direction to the motor rotor to generate resistance and decelerate the motor rotor; and a control system configured to be electrically connected to the reduction stator, wherein when the magnetic levitation motor is in the first preset state, the control system controls the rotation of the motor rotor; and after the magnetic levitation motor switches from the first preset state to the second preset state, the control system controls the reduction stator to decelerate the motor rotor. The addition of a reduction stator and optimized control logic in the magnetic levitation motor provide protection, preventing damage to motor components caused by unexpected power outages, improving product quality, ensuring the reliability of the high-speed magnetic levitation motor, eliminating potential risks from unexpected power outages, and reducing losses.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and in particular to a magnetic levitation motor. Background Technology

[0002] Among related technologies, magnetic levitation motors are widely used in various products such as blowers, vacuum pumps, and refrigerant compressors due to their high energy efficiency, low noise, environmental friendliness, and maintenance-free operation. They are also continuously expanding into other fields, showing a broad market prospect. Under normal operating conditions, high-speed rotating magnetic levitation motors run smoothly. However, certain unexpected situations can directly lead to varying degrees of damage to the magnetic levitation motor and other components. For example, unexpected power outages may damage the magnetic levitation motor, motor inverter, and other components. Therefore, unexpected power outages significantly affect the widespread application of high-speed magnetic levitation motors and require improvement. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail in this disclosure. This overview is not intended to limit the scope of the claims.

[0004] This disclosure provides a magnetic levitation motor to at least solve one of the above-mentioned technical problems.

[0005] According to a first aspect of the present disclosure, a magnetic levitation motor is provided, the magnetic levitation motor comprising:

[0006] Motor rotor;

[0007] The deceleration stator device is configured to decelerate the motor rotor by applying a magnetic field force in a preset direction to the motor rotor to generate resistance after the magnetic levitation motor switches from a first preset state to a second preset state.

[0008] The control system is configured to be electrically connected to the deceleration stator device, wherein when the magnetic levitation motor is in the first preset state, it controls the rotation of the motor rotor; and after the magnetic levitation motor switches from the first preset state to the second preset state, it controls the deceleration stator device to decelerate the motor rotor.

[0009] According to some embodiments of this disclosure, the speed reduction stator device includes:

[0010] A reduction stator, which is sleeved on the outside of the motor rotor;

[0011] A speed-reducing frequency converter is configured to stop the rotation of the motor rotor when the magnetic levitation motor is in a second preset state.

[0012] The control system is also configured to control the speed reducer to stop the rotation of the motor rotor when the magnetic levitation motor is in a second preset state.

[0013] According to some embodiments of this disclosure, the magnetic levitation motor further includes:

[0014] The backup power supply is configured to supply power to the control system and the geared frequency converter when the magnetic levitation motor is in a second preset state.

[0015] The converter is configured to transform the electrical energy transmitted by the magnetic levitation motor and transmit it to the backup power source when the magnetic levitation motor is in the second preset state.

[0016] According to some embodiments of this disclosure

[0017] The backup power supply is also configured to charge the magnetic levitation motor through the working power supply of the magnetic levitation motor when the magnetic levitation motor is in a first preset state, and to disconnect from the working power supply of the magnetic levitation motor when the magnetic levitation motor is in a second preset state.

[0018] According to some embodiments of this disclosure, the magnetic levitation motor further includes:

[0019] The frequency converter is configured to drive the rotor of the magnetic levitation motor to rotate when the magnetic levitation motor is in a first preset state;

[0020] The control system is further configured to be electrically connected to the frequency converter when the magnetic levitation motor is in the first preset state, so as to control the frequency converter to drive the motor rotor to rotate.

[0021] According to some embodiments of this disclosure, the magnetic levitation motor further includes: a magnetic bearing for suspending the motor rotor; and an auxiliary bearing for supporting the motor rotor when the motor rotor is not in a suspended state.

[0022] The control system is further configured to control the magnetic bearing to continue suspending the motor rotor after the magnetic levitation motor switches from a first preset state to a second preset state.

[0023] According to some embodiments of this disclosure

[0024] The first preset state includes: the control system is powered by the working power supply of the magnetic levitation motor; the frequency converter is electrically connected to the stator of the magnetic levitation motor; and the converter is disconnected from the stator of the magnetic levitation motor.

[0025] The second preset state includes: the control system is powered by the backup power supply; the backup power supply is electrically connected to the geared frequency converter; the geared frequency converter is electrically connected to the stator of the magnetic levitation motor; the frequency converter is disconnected from the stator of the magnetic levitation motor; and the converter is electrically connected to the stator of the magnetic levitation motor.

[0026] According to some embodiments of this disclosure, the magnetic levitation motor further includes: a speed detection device for detecting the speed of the motor rotor.

[0027] According to some embodiments of this disclosure

[0028] The control system is further configured to control the magnetic bearing of the magnetic levitation motor to stop leviting the motor rotor when the magnetic levitation motor is in the second preset state and the rotational speed of the motor rotor is within a preset rotational speed range.

[0029] According to some embodiments of this disclosure

[0030] The control system is further configured to disconnect the geared inverter from the stator of the magnetic levitation motor when the motor rotor speed is 0.

[0031] Beneficial effects: The magnetic levitation motor provided in this disclosure is equipped with a speed reduction stator device, and the corresponding control logic is optimized to protect the magnetic levitation motor. This can prevent damage to components such as the magnetic levitation motor, motor frequency converter, and auxiliary bearings caused by accidental power outages, improve product quality, ensure the reliability of high-speed magnetic levitation motors, eliminate the hidden dangers caused by accidental power outages, and reduce losses.

[0032] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of these embodiments. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present disclosure, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without inventive effort.

[0034] Figure 1 This is a schematic diagram of the structure of a magnetic levitation motor according to an exemplary embodiment;

[0035] Figure 2 This is a logic diagram of a control system for a magnetic levitation motor, illustrated according to an exemplary embodiment.

[0036] Figure 3 This is a schematic diagram illustrating the power-off protection technology of a magnetic levitation motor according to an exemplary embodiment.

[0037] In the diagram: 1-Motor rotor; 2-Auxiliary bearing end cover; 3-Front auxiliary bearing; 4-Front auxiliary bearing housing; 5-Front sensor; 6-Front radial magnetic bearing; 7-Front radial magnetic bearing housing; 8-Motor stator; 9-Stator sleeve; 10-Reduction stator; 11-Rear radial magnetic bearing; 12-Rear radial magnetic bearing housing; 13-Rear sensor; 14-Front axial magnetic bearing; 15-Axial limit stop; 16-Rear axial magnetic bearing; 17-Rear axial magnetic bearing housing; 18-Rear auxiliary bearing housing; 19-Rear cover; 20-Rear auxiliary bearing. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions in the disclosed embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be arbitrarily combined with each other.

[0039] Among related technologies, magnetic levitation motors are widely used in various products such as blowers, vacuum pumps, and refrigerant compressors due to their high energy efficiency, low noise, environmental friendliness, and maintenance-free operation. They are also continuously expanding into other fields, showing a broad market prospect. Under normal operating conditions, high-speed magnetic levitation motors run smoothly; however, certain unexpected situations can directly lead to varying degrees of damage to the magnetic levitation motor and other components.

[0040] In practical applications, unexpected power outages are the most common cause of damage to components such as magnetic levitation motors and frequency converters. The main reason is that after a power outage, the magnetic bearings in the high-speed magnetic levitation motor lose power and can no longer levitate the rotor, which travels at speeds up to 30,000 revolutions per minute. The rotor then falls onto the auxiliary bearings at both ends of the motor. Since the maximum speed that the auxiliary bearings can withstand is 10,000 revolutions per minute, the 30,000 revolutions per minute rotor cannot withstand the load for long, leading to rapid friction, overheating, and seizing. This can damage the auxiliary bearings or, in severe cases, destroy the motor rotor. Furthermore, high-speed magnetic levitation motors require frequency converter control for operation. When an unexpected power outage occurs, the high-speed rotation of the motor rotor causes the high-speed magnetic levitation motor to generate electricity in reverse, resulting in power input to the frequency converter output and potentially burning out the frequency converter. Therefore, unexpected power outages significantly hinder the widespread application of high-speed magnetic levitation motors.

[0041] Based on this, this disclosure proposes a magnetic levitation motor, which incorporates a speed-reducing stator device and optimizes the control system. When the magnetic levitation motor is in a first preset state, the control system controls the motor rotor to rotate. When the magnetic levitation motor switches from the first preset state to a second preset state, the control system controls the speed-reducing stator device to apply a preset-direction magnetic field force to the motor rotor, creating resistance to decelerate the rotor. The magnetic levitation motor provided by this disclosure can quickly reduce the rotor speed in the event of an unexpected power outage, thereby preventing damage to components such as the magnetic levitation motor, motor inverter, and auxiliary bearings caused by the unexpected power outage. This improves product quality, ensures the reliability of the high-speed magnetic levitation motor, eliminates potential hazards caused by unexpected power outages, and reduces losses.

[0042] The following is combined Figures 1-3 The present disclosure will be described in detail with reference to specific embodiments.

[0043] Exemplary embodiments of this disclosure provide a magnetic levitation motor, such as Figure 1 As shown, Figure 1 This is a schematic diagram illustrating the structure of a magnetic levitation motor according to an exemplary embodiment. The magnetic levitation motor includes:

[0044] Motor rotor 1;

[0045] The deceleration stator device is configured to decelerate the motor rotor 1 by applying a magnetic field force in a preset direction to the motor rotor 1 to form resistance after the magnetic levitation motor switches from a first preset state to a second preset state.

[0046] The control system is configured to be electrically connected to the deceleration stator device, wherein when the magnetic levitation motor is in a first preset state, the control system controls the motor rotor 1 to rotate; after the magnetic levitation motor switches from the first preset state to the second preset state, the control system controls the deceleration stator device to decelerate the motor rotor 1.

[0047] Considering that a high rotor speed in a magnetic levitation motor during an unexpected power outage could damage components such as auxiliary bearings, it is necessary to reduce the rotor speed as quickly as possible to prevent damage. In this exemplary embodiment, by adding a speed reduction stator device to the magnetic levitation motor, the rotor speed can be reduced in the event of an unexpected power outage. This improves the reliability of the magnetic levitation motor, eliminates potential hazards caused by unexpected power outages, and reduces losses.

[0048] In some exemplary embodiments, such as Figure 1 As shown, the speed reduction stator assembly includes:

[0049] The reduction stator 10 is sleeved on the outside of the motor rotor 1;

[0050] The speed-reducing frequency converter is configured to stop the rotation of the motor rotor 1 when the magnetic levitation motor is in a second preset state;

[0051] The control system is also configured to control the speed reducer to stop the rotation of the motor rotor 1 when the magnetic levitation motor is in a second preset state.

[0052] In this exemplary embodiment, upon receiving a power outage signal, the control system controls the corresponding switch to switch from a first preset state to a second preset state. Then, the control system drives the reduction stator 10 by controlling the reduction inverter, applying a preset magnetic field force to the motor rotor 1 to create resistance and prevent further rotation. This ultimately reduces the speed of the motor rotor 1 to a preset speed, thus protecting the auxiliary bearing in the magnetic levitation motor. For example, this preset speed is less than the maximum safe speed that the auxiliary bearing of the magnetic levitation motor can withstand; the preset speed could be 0.

[0053] Furthermore, in the event of an unexpected power outage, the motor rotor 1 in the magnetic levitation motor may have different initial speeds. To ensure that the speed of the motor rotor 1 is reduced within a preset time (a safe allowable time that will not cause damage to the corresponding components of the motor), when applying a magnetic field force in a preset direction to the motor rotor 1 to form resistance, a matching resistance can also be applied to the motor rotor 1 based on the deceleration stator 10. That is, a larger resistance is applied in the early stage of decelerating the motor rotor 1, and a relatively smaller resistance is applied in the later stage, so that the motor rotor 1 decelerates smoothly and avoids problems such as vibration and noise during the deceleration process.

[0054] In some exemplary embodiments, the magnetic levitation motor further includes:

[0055] The frequency converter is configured to drive the motor rotor 1 to rotate when the magnetic levitation motor is in a first preset state;

[0056] The control system is also configured to be electrically connected to the frequency converter when the magnetic levitation motor is in a first preset state, so as to control the frequency converter to drive the rotation of the motor rotor 1.

[0057] When the magnetic levitation motor is in the first preset state, the control system controls the inverter to drive the motor rotor 1 to rotate at a preset speed. In this exemplary embodiment, when the magnetic levitation motor is in the first preset state, it means that the power supply can normally supply power to the magnetic levitation motor. At this time, the magnetic levitation motor can work normally, that is, it controls the inverter to drive the motor rotor 1 to rotate according to the corresponding program instructions.

[0058] In some exemplary embodiments, the magnetic levitation motor further includes a magnetic bearing for levitizing the motor rotor 1. To ensure the stability of the motor rotor 1 in its levitation state, the magnetic bearing, exemplarily, includes a radial magnetic bearing and an axial magnetic bearing, which cooperate to levit the motor rotor 1. Further, the magnetic levitation motor also includes an auxiliary bearing for supporting the motor rotor 1 when it is not in a levitation state. To ensure the stability of the motor rotor 1 when it is not in a levitation state, the auxiliary bearing, exemplarily, includes a front auxiliary bearing 3 and a rear auxiliary bearing, which cooperate to support the motor rotor 1.

[0059] In this exemplary embodiment, after the magnetic levitation motor switches from the first preset state to the second preset state, the control system of the magnetic levitation motor controls the magnetic bearing to continue levitizing the motor rotor 1; when the magnetic levitation motor is in the second preset state and the rotational speed of the motor rotor 1 is within a preset rotational speed range, the control system of the magnetic levitation motor controls the magnetic bearing of the magnetic levitation motor to stop levitizing the motor rotor 1.

[0060] In some exemplary embodiments, considering that the motor rotor 1 still has a high rotational speed after an unexpected power outage, the control system needs to control the magnetic bearing to keep the motor rotor 1 levitating for a period of time. Therefore, the control system must remain operational. To ensure the normal operation of the control system, the magnetic levitation motor also includes:

[0061] The backup power supply is configured to supply power to the control system and the geared frequency converter when the magnetic levitation motor is in a second preset state.

[0062] In this exemplary embodiment, after the magnetic levitation motor switches from a first preset state to a second preset state, the backup power supply for the magnetic levitation motor supplies power to the control system. This power failure protection method ensures that the deceleration process of the magnetic levitation motor can be executed smoothly, improving the stability and reliability of the deceleration process.

[0063] In some exemplary embodiments, the magnetic levitation motor further includes:

[0064] The converter is configured to transform the electrical energy transmitted by the magnetic levitation motor and transmit it to the backup power supply when the magnetic levitation motor is in a second preset state.

[0065] Considering that the high-speed rotating magnetic levitation motor requires inverter drive control during operation, when an unexpected power outage occurs, the high-speed rotation of the motor rotor 1 will cause the high-speed magnetic levitation motor to generate electricity in reverse, resulting in power input to the inverter output terminal and burning out the inverter. In this exemplary embodiment, a converter is provided inside the magnetic levitation motor. After the magnetic levitation motor switches from a first preset state to a second preset state, the converter controlling the magnetic levitation motor transforms the electrical energy generated by the magnetic levitation motor and transmits it to the backup power supply. This ensures protection for components such as the inverter in the event of an unexpected power outage of the magnetic levitation motor, further improving the safety and reliability of the magnetic levitation motor to a certain extent.

[0066] In some exemplary embodiments, the backup power supply is further configured to charge the magnetic levitation motor through the working power supply of the magnetic levitation motor when the magnetic levitation motor is in a first preset state, and to disconnect from the working power supply of the magnetic levitation motor when the magnetic levitation motor is in a second preset state.

[0067] In this exemplary embodiment, the backup power supply is charged in real time by the working power supply under normal power supply conditions, so that the backup power supply has sufficient power. Therefore, in the event of an unexpected power outage of the magnetic levitation motor, the backup power supply is sufficient to meet the power supply needs of components such as the control system.

[0068] In some exemplary embodiments, the magnetic levitation motor further includes a speed detection device for detecting the speed of the motor rotor 1. In this exemplary embodiment, by detecting the speed of the motor rotor 1 through the speed detection device, the speed of the motor rotor 1 can be adjusted in real time based on the detection structure. Furthermore, in conjunction with the detection structure of the speed detection device, deceleration control of the motor rotor 1 can be performed after an unexpected power outage. Further, the control system of the magnetic levitation motor is also configured to disconnect the geared inverter from the motor stator 8 of the magnetic levitation motor when the speed of the motor rotor 1 is 0.

[0069] In this exemplary embodiment, the rotational speed detection device can detect the speed of the motor rotor 1 of the magnetic levitation motor. When the magnetic levitation motor is in a first preset state, normal speed detection is performed, and the speed control of the magnetic levitation motor in the working state is performed based on the detection results. When the magnetic levitation motor is in a second preset state, the deceleration stator device is controlled to decelerate the motor rotor 1 in an unexpected power failure state according to the detection results, which can achieve more precise control of the deceleration process. For example, the speed detection device is a speed sensor.

[0070] In some exemplary embodiments, the first preset state is the state when the magnetic levitation motor is operating normally, including: the control system is powered by the working power supply of the magnetic levitation motor; the frequency converter is electrically connected to the motor stator 8 of the magnetic levitation motor; and the converter is disconnected from the motor stator 8 of the magnetic levitation motor. The second preset state is the state after the magnetic levitation motor experiences an unexpected power outage, including: the control system is powered by a backup power supply; the backup power supply is electrically connected to the geared frequency converter; the geared frequency converter is electrically connected to the motor stator 8 of the magnetic levitation motor; the frequency converter is disconnected from the motor stator 8 of the magnetic levitation motor; and the converter is electrically connected to the motor stator 8 of the magnetic levitation motor.

[0071] The magnetic levitation motor described in the exemplary embodiments of this disclosure is equipped with a speed reduction stator device and an optimized control system, which can prevent damage to components such as the magnetic levitation motor, frequency converter, and auxiliary bearings caused by accidental power outages, improve product quality, ensure the reliability of the high-speed magnetic levitation motor, eliminate the hidden dangers of accidental power outages to the product, and reduce losses.

[0072] like Figure 2 As shown, Figure 2 This is a logic diagram of a control system for a magnetic levitation motor according to an exemplary embodiment. The control process of the magnetic levitation motor under two states—normal operation and unexpected power failure—will be described below in conjunction with the control logic of the magnetic levitation motor control system. The controller integrates the control functions of the aforementioned control system.

[0073] When the magnetic levitation motor is working normally, the magnetic levitation motor is connected to the working power supply, and the frequency converter is electrically connected to the motor stator 8 of the magnetic levitation motor. When the converter is disconnected from the motor stator 8 of the magnetic levitation motor, the controller controls the magnetic bearing levitation motor rotor 1, and at the same time controls the frequency converter to drive the motor rotor 1 of the magnetic levitation motor to rotate. The backup power supply is in the charging state.

[0074] When the magnetic levitation motor experiences an unexpected power outage, the connection between the magnetic levitation motor and the frequency converter is disconnected to prevent reverse power generation from damaging the frequency converter. At this time, the magnetic levitation motor rotor 1 rotates at high speed under the action of inertia, generating electricity in reverse. The generated electrical energy is transformed by the converter and continues to supply power to the backup power supply. The controller is connected to the backup power supply and is always in working state. Through the monitoring of the motor rotor 1 by corresponding sensors (such as speed sensors set at both ends of the motor rotor 1), the controller continues to control the magnetic bearings (radial magnetic bearings and axial magnetic bearings) to levitate the motor rotor 1. After the unexpected power outage, the controller controls the backup power supply to connect to the reduction frequency converter 2, driving the reduction stator 10 to control the motor rotor 1 to decelerate smoothly. When the speed of the motor rotor 1 reaches the set value (such as the speed is 0), the magnetic levitation bearings no longer levitate the motor rotor 1, and the motor rotor 1 falls onto the auxiliary bearing. This avoids the motor rotor 1 falling onto the auxiliary bearing when rotating at high speed, which would damage the motor rotor 1 and the auxiliary bearing. This achieves the function of protecting the motor and its components after an unexpected power outage.

[0075] To further explain the structure of the magnetic levitation motor and its circulating water regulating and deceleration device in this exemplary embodiment, the following will be combined with... Figure 3 To explain, Figure 3 This is a schematic diagram illustrating the power-off protection technology of a magnetic levitation motor according to an exemplary embodiment.

[0076] like Figure 1 , Figure 3 As shown, the magnetic levitation motor includes: motor rotor 1, auxiliary bearing end cover 2, front auxiliary bearing 3, front auxiliary bearing seat 4, front sensor 5, front radial magnetic bearing 6, front radial magnetic bearing seat 7, motor stator (M1) 8, stator sleeve 9, reduction stator (M2) 10, rear radial magnetic bearing 11, rear radial magnetic bearing seat 12, rear sensor 13, front axial magnetic bearing 14, axial limit block 15, rear axial magnetic bearing 16, rear axial magnetic bearing seat 17, rear auxiliary bearing seat 18, rear cover 19, rear auxiliary bearing 20, frequency converter, reduction frequency converter, converter, backup power supply, controller, etc.

[0077] Install and connect the motor rotor 1, auxiliary bearing end cover 2, front auxiliary bearing 3, front auxiliary bearing housing 4, front sensor 5, front radial magnetic bearing 6, front radial magnetic bearing housing 7, motor stator (M1) 8, stator sleeve 9, reduction stator (M2) 10, rear radial magnetic bearing 11, rear radial magnetic bearing housing 12, rear sensor 13, front axial magnetic bearing 14, axial limit block 15, rear axial magnetic bearing 16, rear axial magnetic bearing housing 17, rear auxiliary bearing housing 18, rear cover 19, rear auxiliary bearing 20, frequency converter, reduction frequency converter, converter, backup power supply, controller, etc., as shown in the diagram. To achieve the levitation function of the motor rotor 1, the front and rear radial magnetic bearings in the magnetic bearing system work together to provide a radial magnetic field force to levitate the motor rotor 1. Simultaneously, the front and rear axial magnetic bearings in the magnetic bearing system provide an axial magnetic field force to stabilize the motor rotor 1 in the axial direction. Furthermore, in this exemplary embodiment, front radial magnetic bearing seats and rear radial magnetic bearing seats are respectively provided for limiting and fixing the corresponding front radial magnetic bearing and rear radial magnetic bearing, and axial limiting blocks 15 and rear axial magnetic bearing seats 17 are respectively provided for limiting and fixing the corresponding front axial magnetic bearing 14 and rear axial magnetic bearing 16. To achieve support for the motor rotor 1 when it is not suspended, it can be achieved by the cooperation of the front auxiliary bearing 3 provided at the front end of the motor rotor 1 and the rear auxiliary bearing 20 provided at the rear end of the motor rotor 1. The front auxiliary bearing 3 is limited and fixed by the cooperation of the auxiliary bearing end cover 2 and the front auxiliary bearing seat 4, and the rear auxiliary bearing 20 is limited and fixed by the cooperation of the rear auxiliary bearing seat 18 and the rear cover 19. The motor stator (M1) 8 and the reduction stator (M2) 10 are coaxially sleeved on the motor rotor 1, and the motor stator (M1) 8 and the reduction stator (M2) 10 are externally sleeved with stator sleeves 9.

[0078] like Figure 3 As shown, when the magnetic levitation motor needs to work, switch QS is turned on, the equipment is powered on, relay KM is energized, the normally open contact KM between the stator 8 of the magnetic levitation motor and the frequency converter closes, and the stator 8 of the magnetic levitation motor is connected to the frequency converter; the normally closed contact KM between the stator 8 of the magnetic levitation motor and the converter opens, and the stator 8 of the magnetic levitation motor is disconnected from the converter; after setting all parameters, the equipment is started. The controller first controls the front radial magnetic bearing (KM1) 6, the rear radial magnetic bearing (KM2) 11, the front axial magnetic bearing (KM3) 14, and the rear axial magnetic bearing (KM4) 16 to levitate the motor rotor 1. The levitation accuracy of the motor rotor 1 is adjusted in real time based on the information fed back by the front position sensor (Q1) 5 and the rear position sensor (Q2) 13. After the motor meets the working requirements, the controller controls the frequency converter to work, the stator 8 of the magnetic levitation motor is energized, and the motor rotor 1 drives the load to rotate. At this time, the magnetic levitation motor works normally, and the backup power supply is always in a charging standby state.

[0079] based on Figure 3 In the illustrated embodiment, L1, L2, and L3 are de-energized. At this time, relay KM is de-energized, and the normally open contact KM between the stator 8 of the magnetic levitation motor and the frequency converter is disconnected. The stator 8 of the magnetic levitation motor is disconnected from the frequency converter, thus preventing the motor rotor 1 from continuing to rotate at high speed and causing the frequency converter to burn out due to reverse power generation by the magnetic levitation motor.

[0080] When relay KM is de-energized, the backup power supply disconnects from the main line (the working power supply of the magnetic levitation motor) for charging. The normally closed contact KM between the stator 8 terminal of the magnetic levitation motor and the converter closes. At this time, the stator 8 terminal of the magnetic levitation motor is connected to the converter, and the motor rotor 1 rotates at high speed. This causes the electricity generated by the magnetic levitation motor in reverse direction to be converted by the converter and supplied to the backup power supply, ensuring that the backup power supply is always in a charging state and avoiding the risk of running out of power before the protection is completed. The controller continues to control the front radial magnetic bearing (KM1) 6, the rear radial magnetic bearing (KM2) 11, the front axial magnetic bearing (KM3) 14, and the rear axial magnetic bearing (KM4) 16 to levitate the motor rotor 1. The geared frequency converter is connected to the backup power supply, driving the geared stator (M2) 10 to work. Based on the detected actual speed of the motor rotor 1, the controller controls the geared frequency converter to smoothly decelerate the geared stator (M2) 10, avoiding the impact of rapid deceleration on the magnetic levitation motor. When the controller detects that the speed of the motor rotor 1 is zero via a sensor, the converter stops working, the controller is powered off, the geared frequency converter is disconnected from the geared stator (M2) 10, and the geared stator (M2) 10 stops working. The front radial magnetic bearing (KM1) 6, the rear radial magnetic bearing (KM2) 11, the front axial magnetic bearing (KM3) 14, and the rear axial magnetic bearing (KM4) 16 will no longer levitate the motor rotor 1, and the motor rotor 1 will fall onto the front auxiliary bearing 3 and the rear auxiliary bearing 20. This achieves protection for the motor rotor 1, the frequency converter, and the auxiliary bearings, preventing damage to the high-speed magnetic levitation motor and its components caused by accidental power outages.

[0081] In this disclosure, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase “comprising…” does not exclude the presence of additional identical elements in the article or device that includes that element.

[0082] Although preferred embodiments of the present disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0083] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, the intent of this disclosure also includes these modifications and variations.

Claims

1. A magnetic levitation motor, characterized by, The magnetic suspension motor comprises: a motor rotor; a deceleration stator device configured to form a resistance to decelerate the motor rotor based on exerting a preset direction magnetic field force on the motor rotor after the magnetic suspension motor is switched from a first preset state to a second preset state; a control system electrically connected with the deceleration stator device, wherein the control system controls the motor rotor to rotate when the magnetic suspension motor is in the first preset state, and controls the deceleration stator device to decelerate the motor rotor after the magnetic suspension motor is switched from the first preset state to the second preset state; the deceleration stator device comprises a deceleration stator sleeved outside the motor rotor and a deceleration frequency converter configured to stop the motor rotor from rotating when the magnetic suspension motor is in the second preset state; and the control system is further configured to control the deceleration frequency converter to stop the motor rotor from rotating when the magnetic suspension motor is in the second preset state; the first preset state comprises that the control system is powered by a working power supply of the magnetic suspension motor, a frequency converter of the magnetic suspension motor is electrically connected with a motor stator of the magnetic suspension motor, and a converter of the magnetic suspension motor is disconnected with the motor stator of the magnetic suspension motor; the second preset state comprises that the control system is powered by a backup power supply of the magnetic suspension motor, the backup power supply is electrically connected with the deceleration frequency converter, the deceleration frequency converter is electrically connected with the motor stator of the magnetic suspension motor, the frequency converter is disconnected with the motor stator of the magnetic suspension motor, and the converter is electrically connected with the motor stator of the magnetic suspension motor.

2. The magnetic levitation motor of claim 1, wherein, The magnetic suspension motor further comprises: a backup power supply configured to supply power to the control system and the deceleration frequency converter when the magnetic suspension motor is in the second preset state; a converter configured to transmit electric energy transmitted by the magnetic suspension motor to the backup power supply after the electric energy is transformed by the converter when the magnetic suspension motor is in the second preset state.

3. The magnetic suspension motor of claim 2, wherein the backup power supply is further configured to be charged by the working power supply of the magnetic suspension motor when the magnetic suspension motor is in the first preset state, and is disconnected with the working power supply of the magnetic suspension motor when the magnetic suspension motor is in the second preset state.

4. The magnetic levitation motor of claim 2, wherein, The magnetic suspension motor further comprises: a frequency converter configured to drive the motor rotor to rotate when the magnetic suspension motor is in the first preset state; the control system is further configured to be electrically connected with the frequency converter to control the frequency converter to drive the motor rotor to rotate when the magnetic suspension motor is in the first preset state.

5. The magnetic levitation motor of claim 4, wherein, The magnetic suspension motor further comprises a magnetic bearing for suspending the motor rotor and an auxiliary bearing for supporting the motor rotor when the motor rotor is not in a suspended state; the control system is further configured to control the magnetic bearing to continue to suspend the motor rotor after the magnetic suspension motor is switched from the first preset state to the second preset state.

6. The magnetic levitation motor of claim 1, wherein, The magnetic suspension motor further comprises a rotating speed detection device configured to detect the rotating speed of the motor rotor. 7.The magnetic suspension motor of claim 1, wherein, The control system is further configured to control the magnetic bearing of the magnetic suspension motor to stop suspending the motor rotor when the magnetic suspension motor is in the second preset state and the rotating speed of the motor rotor is in a preset rotating speed interval value. 8.The magnetic suspension motor of claim 7, wherein, The control system is further configured to control the deceleration frequency converter to be disconnected from the motor stator of the magnetic suspension motor when the rotating speed of the motor rotor is 0.

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