Magnetic suspension motor detection device and magnetic suspension motor control system

Abstract

The invention is mainly used in the technical field of magnetic suspension motors. The invention discloses a magnetic suspension motor detection device and a magnetic suspension motor control system. The magnetic suspension motor detection device comprises a main body module and a sensor module. The main body module is arranged on a stator of the magnetic suspension motor and comprises a connecting part and a fixing part; the connecting part is used for connecting a stator of the magnetic suspension motor to fix the main body module; the sensor module is arranged on the fixing part, and the fixing part is used for fixing the sensor module; the sensor module is used for detecting the rotation state of a rotor of the magnetic suspension motor to obtain a rotor rotation signal. According to the invention, the rotor rotation signal of the magnetic suspension motor can be directly detected, and the frequency of the magnetic suspension motor can be measured and calculated more accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic levitation motors, and in particular to a magnetic levitation motor detection device and a magnetic levitation motor control system. Background Art

[0002] The magnetic levitation motor is a new type of motor that uses magnetic bearings to suspend the motor rotor, thereby achieving frictionless and contactless rotation. This motor has the following advantages: no wear, long service life, high rotor circumferential linear speed, no need for lubrication and sealing, low heat generation, low power consumption, strong environmental adaptability, and can work in vacuum and corrosive media. In view of these advantages, magnetic levitation motors, especially magnetic levitation high-speed motors, have been increasingly widely used in high-speed blowers, compressors, energy storage flywheels, vacuum molecular pumps, and high-speed gas turbine distributed power generation.

[0003] However, there are some technical problems when the magnetic levitation motor runs at high speed. For example, the magnetic levitation motor cannot detect frequency feedback when running at high speed, and can only feedback the frequency through the frequency converter. This is because there is no contact between the rotor and stator of the magnetic levitation motor. Traditional mechanical sensors cannot directly detect the frequency of the magnetic levitation motor and can only rely on the feedback signal of the frequency converter to indirectly obtain frequency information. Summary of the invention

[0004] The present invention provides a magnetic levitation motor detection device and a magnetic levitation motor control system, which can directly detect the rotor rotation signal of the magnetic levitation motor and are conducive to more accurately measuring the frequency of the magnetic levitation motor.

[0005] The present invention provides a magnetic levitation motor detection device, the device comprising a main body module and a sensor module; The main body module is arranged on the stator of the magnetic levitation motor, and the main body module comprises a connecting part and a fixing part; The connecting portion is used to connect the stator of the magnetic levitation motor to fix the main body module; The sensor module is arranged on the fixing portion, and the fixing portion is used to fix the sensor module; The sensor module is used to detect the rotation state of the rotor of the magnetic levitation motor to obtain a rotor rotation signal.

[0006] Furthermore, the main body module includes a plurality of the connecting parts, the main body module is a circular ring, and each of the connecting parts is evenly distributed on the circular ring; The circular ring is used to be nested between the stator of the magnetic levitation motor and the rotor of the magnetic levitation motor; The fixing portion is a groove on the ring, and the sensor module is arranged in the groove.

[0007] Further, the sensor module includes a control board and a detector; The control panel is located on the circular ring, and the surface of the control panel is in contact with the surface of the circular ring; The groove is located on the inner ring surface of the ring, and the groove includes a first notch and a second notch; The detector is located in the groove, the detector collects the rotor rotation signal through the first notch, and the detector is connected to the control board through the second notch.

[0008] The present invention further provides a magnetic levitation motor control system, the system comprising a controller unit and any one of the magnetic levitation motor detection devices described above, the controller unit being connected to the magnetic levitation motor detection device; The controller unit is used to: Acquiring a rotor rotation signal detected by the magnetic levitation motor detection device; The frequency of the magnetic levitation motor is determined according to the rotor rotation signal.

[0009] Furthermore, the controller unit is also used for: When it is detected that the rotor rotation signal is not equal to a preset signal, the magnetic suspension motor is controlled to be in a stopped state.

[0010] Furthermore, the controller unit is also used for: updating the current rotor rotation speed according to the rotor rotation signal; Obtaining a given speed of a frequency converter of the magnetic levitation motor; When the updated rotor rotation speed is not equal to the given speed, the magnetic levitation motor is controlled to be in a stopped state.

[0011] Furthermore, the specific implementation of controlling the magnetic levitation motor to be in a stopped state includes: When a fault signal is detected or the magnetic levitation motor is in a stopped state, if the current rotor rotation speed is greater than zero, the magnetic levitation motor is controlled to reduce the frequency of the magnetic levitation motor within a preset time period until the magnetic levitation motor stops running.

[0012] Furthermore, the controller unit is also used for: When the rotor rotation signal is not detected within a preset rotation period, a fault signal indicating that the sensor stops working is generated and an alarm notification is issued.

[0013] Furthermore, the controller unit is also used for: When it is detected that the voltage of the magnetic levitation motor is not within a first preset value range or the current of the magnetic levitation motor is not within a second preset value range, a fault signal indicating that the power supply stops working is generated and an alarm notification is issued.

[0014] Further, the control unit includes a first controller and a second controller; The first controller is arranged outside the magnetic levitation motor, and the second controller is arranged inside the magnetic levitation motor; The first controller is used to control the magnetic levitation motor; The second controller is used to control the magnetic levitation motor to a stopped state when a fault signal indicating that the first controller stops working is detected.

[0015] The present invention has at least the following beneficial effects: Traditional mechanical sensors cannot directly detect the frequency because there is no contact between the rotor and stator of the magnetic levitation motor. However, the sensor module of the magnetic levitation motor detection device in the technical solution of this application is set in the fixed part of the main module, and the main module is fixed on the stator of the magnetic levitation motor through the connecting part, so that the sensor module can stably detect the rotation state of the rotor. The sensor module can directly obtain the rotation signal of the rotor by a non-contact detection method, thereby obtaining accurate frequency information, and no longer relies on the feedback signal of the frequency converter to indirectly obtain the frequency, thereby improving the accuracy and reliability of the detection.

[0016] The magnetic levitation motor control system is connected to the detection device through the controller unit, and can obtain the rotor rotation signal detected by the detection device. Since the sensor module in the detection device can directly detect the rotor rotation state, the controller unit can accurately determine the frequency of the magnetic levitation motor based on this, and no longer rely on the inverter feedback frequency, thereby realizing direct and accurate detection of the magnetic levitation motor frequency, improving the reliability and real-time performance of frequency detection, and providing a strong guarantee for the stable operation and precise control of the magnetic levitation motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0018] Figure 1 is a structural schematic diagram of a magnetic levitation motor detection device provided in this embodiment; Figure 2 It is a structural schematic diagram of a magnetic levitation motor control system provided in this embodiment. DETAILED DESCRIPTION

[0019] 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.

[0020] The magnetic levitation motor is a new type of motor that uses magnetic bearings to suspend the motor rotor, thereby achieving frictionless and contactless rotation. This motor has the following advantages: no wear, long service life, high rotor circumferential linear speed, no need for lubrication and sealing, low heat generation, low power consumption, strong environmental adaptability, and can work in vacuum and corrosive media. In view of these advantages, magnetic levitation motors, especially magnetic levitation high-speed motors, have been increasingly widely used in high-speed blowers, compressors, energy storage flywheels, vacuum molecular pumps, and high-speed gas turbine distributed power generation.

[0021] However, there are some technical problems with magnetic levitation motors when they are running at high speeds. First, the magnetic levitation motor cannot detect frequency feedback when it is running at high speed, and can only feedback the frequency through the frequency converter. This is because there is no contact between the rotor and stator of the magnetic levitation motor. Traditional mechanical sensors cannot directly detect the frequency of the rotor and can only rely on the feedback signal of the frequency converter to indirectly obtain frequency information. Secondly, when the magnetic levitation motor loses the control circuit, it will fall during high-speed operation. Magnetic levitation bearings (active magnetic levitation bearings) rely on electrical energy to work. Once the equipment encounters a power outage or control circuit failure during operation, the magnetic levitation bearing will lose control, causing the high-speed rotating rotor to fall, causing destructive losses.

[0022] In order to solve the above problems, the present application provides the following embodiments.

[0023] This embodiment provides a magnetic levitation motor detection device including a main body module and a sensor module.

[0024] The main body module is arranged on the stator of the magnetic levitation motor, and the main body module includes a connecting part and a fixing part; the connecting part is used to connect the stator of the magnetic levitation motor to fix the main body module; the sensor module is arranged on the fixing part, and the fixing part is used to fix the sensor module; the sensor module is used to detect the rotation state of the rotor of the magnetic levitation motor and obtain a rotor rotation signal.

[0025] It is understandable that the traditional mechanical sensor cannot directly detect the frequency because there is no contact between the rotor and the stator of the magnetic levitation motor, while the sensor module in the technical solution of the present application is arranged in the fixed part of the main module, and the main module is fixed on the stator of the magnetic levitation motor through the connecting part, so that the sensor module can stably detect the rotation state of the rotor. The sensor module can adopt a non-contact detection method, such as electromagnetic induction, optics and other principles, to directly obtain the rotation signal of the rotor, thereby obtaining accurate frequency information, and no longer relying on the feedback signal of the inverter to indirectly obtain the frequency, thereby improving the accuracy and reliability of the detection.

[0026] In some embodiments, the connection portion is implemented by screws or bolts. This connection method is firm and reliable, easy to install and disassemble, and can ensure the stability of the sensor module during operation.

[0027] In some embodiments, the rotation direction of the rotor of the magnetic levitation motor is detected. At least two detection devices arranged at intervals along the rotation direction of the rotating shaft are controlled to detect sampling signals when the rotating shaft rotates, and the rotation direction of the rotating shaft is determined according to the sampling signals. By comparing the rotation direction of the rotating shaft with the set rotation direction, if the comparison result is inconsistent, a connection error message is output, so that the user can handle the connection fault in time, thereby reducing the impact of the connection problem of the magnetic levitation motor on the system operation reliability.

[0028] In some embodiments, when an abnormal rotation state of the rotor is detected, such as rotor falling, abnormal speed, excessive axial displacement, etc., the detection device can promptly issue fault diagnosis information and alarm signals to remind the user to take appropriate measures to deal with it, avoid further expansion of the fault, and ensure the safe operation of the magnetic levitation motor.

[0029] In some embodiments, the main body module includes multiple connecting parts, the main body module is a circular ring, and each connecting part is evenly distributed on the circular ring; the circular ring is used to be nested between the stator and the rotor of the magnetic levitation motor; the fixing part is a groove on the circular ring, and the sensor module is arranged in the groove.

[0030] In some embodiments, the sensor module includes a control board and a detector; the control board is located on the ring, and the surface of the control board is in contact with the surface of the ring; the groove is located on the inner ring surface of the ring, and the groove includes a first notch and a second notch; the detector is located in the groove, the detector collects the rotor rotation signal through the first notch, and the detector is connected to the control board through the second notch.

[0031] See also Figure 1The main body module is a circular ring 100, and the connecting portion 110 of the main body module is a screw hole. The main body module is fixed to the stator by screws and screw holes. The fixing portion 120 of the main body module is a groove, and the detector 220 of the sensor module is arranged in the groove. The control board 210 of the sensor module is arranged on the surface of the circular ring 100.

[0032] Please refer to Figure 2 , Figure 2 It is a structural schematic diagram of a magnetic levitation motor control system provided in this embodiment.

[0033] This embodiment provides a magnetic levitation motor control system including a controller unit and the magnetic levitation motor detection device in any one of the above embodiments, and the controller unit is connected to the magnetic levitation motor detection device.

[0034] The controller unit is used for: obtaining the rotor rotation signal detected by the magnetic suspension motor detection device; and determining the frequency of the magnetic suspension motor according to the rotor rotation signal.

[0035] It is understandable that the magnetic levitation motor control system is connected to the detection device through the controller unit, and can obtain the rotor rotation signal detected by the detection device. Since the sensor module in the detection device can directly detect the rotor rotation state, the controller unit can accurately determine the frequency of the magnetic levitation motor based on this, and no longer rely on the inverter feedback frequency, thereby realizing direct and accurate detection of the frequency of the magnetic levitation motor, improving the reliability and real-time performance of frequency detection, and providing a strong guarantee for the stable operation and precise control of the magnetic levitation motor.

[0036] In some embodiments, the controller unit is further configured to: When it is detected that the rotor rotation signal is not equal to the preset signal, the magnetic suspension motor is controlled to be in a stopped state.

[0037] In some embodiments, the controller unit is further configured to: The current rotor rotation speed is updated according to the rotor rotation signal; the given speed of the frequency converter of the magnetic levitation motor is obtained; when the updated rotor rotation speed is not equal to the given speed, the magnetic levitation motor is controlled to be in a stopped state.

[0038] It can be understood that, firstly, the controller unit determines the motor frequency by acquiring the rotor rotation signal of the detection device, and updates the rotor rotation speed in real time, which enables the running state of the motor to be accurately sensed and tracked, provides accurate data support for subsequent control operations, and improves the stability and reliability of the motor operation. Secondly, the controller unit compares the updated rotor rotation speed with the given speed of the inverter, and when the two are inconsistent, controls the motor to stop working in time. This control mechanism based on speed feedback can effectively avoid problems such as motor overload and damage caused by speed deviation, and enhances the safety and protection performance of the system. At the same time, this precise speed control also helps to improve the operating efficiency of the motor, ensure that the motor runs in the best working state, thereby reducing energy consumption and improving the overall performance of the system. In addition, the control system reduces manual intervention, reduces the difficulty of operation and the error rate through automated monitoring and control processes, improves the intelligence level and operating efficiency of the system, and provides a strong technical guarantee for the widespread application of magnetic levitation motors.

[0039] In some embodiments, the specific implementation of controlling the magnetic levitation motor to be in a stopped state includes: When a fault signal is detected or the magnetic levitation motor is in a stopped state, if the current rotor rotation speed is greater than zero, the magnetic levitation motor is controlled to reduce the frequency of the magnetic levitation motor within a preset time period until the magnetic levitation motor stops running.

[0040] It is understandable that the specific implementation method of controlling the motor to stop working further optimizes the safety of the system. The controller unit can obtain the rotor rotation signal and determine the motor frequency. When the signal is abnormal, the motor is controlled to stop working. During the stopping process, if the rotor is still rotating, the system will gradually reduce the frequency within a preset time period so that the motor can decelerate smoothly until it stops. This progressive shutdown method avoids the rotor falling and equipment damage caused by sudden shutdown, ensuring the safety and reliability of the system. In addition, when a fault signal is detected or the motor is in a stopped state but the rotor is still rotating, the system will not force the shutdown immediately, but gradually reduce the motor frequency within a preset time period so that the motor can decelerate smoothly until it stops. This progressive shutdown method avoids the impact and vibration caused by sudden shutdown, reduces damage to motor components, and also reduces problems such as system pressure fluctuations that may be caused by shutting down too quickly, further enhancing the stability and safety of the system.

[0041] In some embodiments, the controller unit is further configured to: When the rotor rotation signal is not detected within a preset rotation period, a fault signal indicating that the sensor stops working is generated and an alarm notification is issued.

[0042] In some embodiments, the controller unit is further configured to: When it is detected that the voltage of the magnetic levitation motor is not within the first preset value range or the current of the magnetic levitation motor is not within the second preset value range, a fault signal indicating that the power supply stops working is generated and an alarm notification is issued.

[0043] In some embodiments, the control unit includes a first controller and a second controller.

[0044] The first controller is arranged outside the magnetic levitation motor, and the second controller is arranged inside the magnetic levitation motor; the first controller is used to control the magnetic levitation motor; the second controller is used to control the magnetic levitation motor to be in a stopped state when a fault signal indicating that the first controller stops working is detected.

[0045] It is understandable that the magnetic levitation motor control system significantly improves the reliability and safety of the system by setting up two internal and external controllers. The first controller is located outside the motor and is responsible for daily motor control operations. It can determine the motor frequency and perform corresponding control according to the rotor rotation signal obtained by the detection device to ensure that the motor runs stably under normal working conditions, realize precise regulation of the motor, and improve the operating efficiency and performance of the motor. The second controller is set inside the motor. When a fault signal of stopping working is detected in the first controller, it can quickly take over and control the motor to stop working. This dual-controller design is equivalent to adding a safety line for the operation of the motor. When the first controller fails due to an unexpected fault, the second controller can respond in time to prevent the motor from continuing to run in an out-of-control state, thereby avoiding possible serious consequences such as rotor falling and equipment damage, effectively ensuring the safety of the magnetic levitation motor and related equipment, and reducing maintenance costs and potential economic losses. In addition, the collaborative working mode of the internal and external controllers also enhances the fault tolerance of the system, improves the stability and robustness of the entire magnetic levitation motor control system, enables it to better cope with complex and changeable working environments and emergencies, and provides strong technical support for the widespread application of magnetic levitation motors.

[0046] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application 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 data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, device, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. It should be understood that in the present application, "at least one (item)" refers to one or more, and "a plurality" refers to two or more.

[0047] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0048] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0049] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0050] Although the description of the present application has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the attached claims, taking into account the prior art, so as to effectively cover the intended scope of the present application. In addition, the above description of the present application is based on the embodiments foreseeable by the inventor, and its purpose is to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A magnetic levitation motor detection device, characterized in that: The device comprises a main body module and a sensor module; The main body module is arranged on the stator of the magnetic levitation motor, and the main body module comprises a connecting part and a fixing part; The connecting portion is used to connect the stator of the magnetic levitation motor to fix the main body module; The sensor module is arranged on the fixing portion, and the fixing portion is used to fix the sensor module; The sensor module is used to detect the rotation state of the rotor of the magnetic levitation motor to obtain a rotor rotation signal.

2. A magnetic levitation motor detection device according to claim 1, characterized in that: The main body module includes a plurality of the connecting parts, the main body module is a circular ring, and each of the connecting parts is evenly distributed on the circular ring; The circular ring is used to be nested between the stator of the magnetic levitation motor and the rotor of the magnetic levitation motor; The fixing portion is a groove on the ring, and the sensor module is arranged in the groove.

3. A magnetic levitation motor detection device according to claim 2, characterized in that: The sensor module includes a control board and a detector; The control panel is located on the circular ring, and the surface of the control panel is in contact with the surface of the circular ring; The groove is located on the inner ring surface of the ring, and the groove includes a first notch and a second notch; The detector is located in the groove, the detector collects the rotor rotation signal through the first notch, and the detector is connected to the control board through the second notch.

4. A magnetic levitation motor control system, characterized in that: The system comprises a controller unit and the magnetic levitation motor detection device according to any one of claims 1 to 3, wherein the controller unit is connected to the magnetic levitation motor detection device; The controller unit is used to: Acquiring a rotor rotation signal detected by the magnetic levitation motor detection device; The frequency of the magnetic levitation motor is determined according to the rotor rotation signal.

5. A magnetic levitation motor control system according to claim 4, characterized in that: The controller unit is also used for: When it is detected that the rotor rotation signal is not equal to a preset signal, the magnetic suspension motor is controlled to be in a stopped state.

6. A magnetic levitation motor control system according to claim 5, characterized in that: The controller unit is also used for: updating the current rotor rotation speed according to the rotor rotation signal; Obtaining a given speed of a frequency converter of the magnetic levitation motor; When the updated rotor rotation speed is not equal to the given speed, the magnetic levitation motor is controlled to be in a stopped state.

7. A magnetic levitation motor control system according to claim 6, characterized in that: The specific implementation of controlling the magnetic levitation motor to be in a stopped state includes: When a fault signal is detected or the magnetic levitation motor is in a stopped state, if the current rotor rotation speed is greater than zero, the magnetic levitation motor is controlled to reduce the frequency of the magnetic levitation motor within a preset time period until the magnetic levitation motor stops running.

8. A magnetic levitation motor control system according to claim 7, characterized in that: The controller unit is also used for: When the rotor rotation signal is not detected within a preset rotation period, a fault signal indicating that the sensor stops working is generated and an alarm notification is issued.

9. A magnetic levitation motor control system according to claim 7, characterized in that: The controller unit is also used for: When it is detected that the voltage of the magnetic levitation motor is not within a first preset value range or the current of the magnetic levitation motor is not within a second preset value range, a fault signal indicating that the power supply stops working is generated and an alarm notification is issued.

10. The magnetic levitation motor control system according to claim 7, characterized in that: The control unit includes a first controller and a second controller; The first controller is arranged outside the magnetic levitation motor, and the second controller is arranged inside the magnetic levitation motor; The first controller is used to control the magnetic levitation motor; The second controller is used to control the magnetic levitation motor to a stopped state when a fault signal indicating that the first controller stops working is detected.

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