WO2021189834A1

WO2021189834A1 - Detection method and apparatus for magnetic levitation system, storage medium, and processor

Info

Publication number: WO2021189834A1
Application number: PCT/CN2020/123143
Authority: WO
Inventors: 贺永玲; 赵聪; 严安顺; 王凡; 李旭明; 朱振宇
Original assignee: 珠海格力电器股份有限公司
Priority date: 2020-03-24
Filing date: 2020-10-23
Publication date: 2021-09-30
Also published as: CN111308252A

Abstract

A detection method and apparatus for a magnetic levitation system, a storage medium, processor, and a magnetic levitation compressor. The magnetic levitation system comprises a spindle (10), a motor (20), an electromagnetic bearing (30), and an auxiliary bearing (40). The motor (20) works to drive the spindle (10) to rotate. The electromagnetic bearing (30) and the auxiliary bearing (40) are separately disposed on the spindle (10), and the radius of the electromagnetic bearing (30) is greater than that of the auxiliary bearing (40). The detection method comprises: detecting whether the electromagnetic bearing stops working (S101); if it is detected that the electromagnetic bearing stops working, controlling the spindle to rotate at a predetermined rotational speed (S102); detecting working current of the motor (S103); and determining the state of the auxiliary bearing according to the working current (S104). Because the blocking or jamming of the auxiliary bearing (40) results in the increase of the working current of the motor (20), the state of the auxiliary bearing (40) can be determined according to the magnitude of the working current of the motor (20), and therefore, the state detection efficiency of the auxiliary bearing (40) is improved, real-time state detection of the auxiliary bearing (40) is realized, and accurate maintenance is achieved.

Description

Detection method, device, storage medium and processor of magnetic levitation system

Cross-references to related applications

This application is based on the application with the CN application number 202010215308.3 and the filing date of March 24, 2020, and claims its priority. The disclosure of the CN application is hereby incorporated into this application as a whole.

Technical field

The present disclosure relates to the field of magnetic levitation technology, and in particular, to a detection method, device, storage medium, processor, and magnetic levitation compressor of a magnetic levitation system.

Background technique

In the magnetic levitation system, the main shaft relies on electromagnetic bearings to achieve levitation operation. When the levitation fails, the main shaft hits the electromagnetic bearing and damages the entire magnetic levitation system. In order to protect the electromagnetic bearing, the magnetic levitation system usually designs auxiliary bearings to protect it.

There are many types of auxiliary bearings, such as ball bearings, sliding bearings and other bearings that can rotate freely and smoothly. When the high-speed main shaft is suspended due to some reasons, the main shaft will fall freely and hit the auxiliary bearing. The auxiliary bearing rotates with the main shaft at high speed to buffer and reduce the impact force of the main shaft to avoid damage to the magnetic levitation system. However, the auxiliary bearing may also fail due to some reasons, unable to rotate freely and smoothly, and the auxiliary bearing is stuck or even stuck, which reduces the function of the auxiliary bearing or completely loses its function. This will greatly reduce the reliability of the magnetic levitation system, reduce the service life, and even cause system damage.

At present, after the auxiliary bearing is assembled into a complex sealed magnetic levitation system, it is impossible to observe and detect the state of the auxiliary bearing. The method known by the inventors of the present disclosure is to regularly carry out the disassembly, inspection and replacement of the auxiliary bearing. However, the disassembly and inspection of the auxiliary bearing has a large amount of work and high cost, which affects the normal use of user equipment and is inefficient.

The above information disclosed in the background technology section is only used to strengthen the understanding of the background technology of the technology described herein. Therefore, the background technology may contain certain information, which does not form the prior art for those skilled in the art. .

Summary of the invention

According to one aspect of the present disclosure, there is provided a detection method of a magnetic levitation system, the magnetic levitation system including a main shaft, a motor, an electromagnetic bearing and an auxiliary bearing, the motor works to drive the main shaft to rotate, the electromagnetic bearing and the auxiliary bearing The bearings are respectively arranged on the main shaft, the radius of the electromagnetic bearing is greater than the radius of the auxiliary bearing, and the detection method includes: detecting whether the electromagnetic bearing stops working; when it is detected that the electromagnetic bearing stops working , Controlling the main shaft to rotate at a predetermined speed; detecting the working current of the motor; and determining the state of the auxiliary bearing according to the working current.

In some embodiments, the magnetic levitation system further includes a bearing controller and a motor controller; the step of controlling the spindle to rotate at a predetermined speed includes: in the case of detecting that the electromagnetic bearing stops working, the bearing The controller sends a detection instruction to the motor controller; and the motor controller controls the operating current of the motor according to the detection instruction so that the main shaft rotates at the predetermined rotation speed.

In some embodiments, the step of determining the state of the auxiliary bearing according to the operating current includes: comparing the operating current and the current threshold of the motor to obtain a comparison result; and determining the auxiliary bearing according to the comparison result status.

In some embodiments, the current threshold includes a first current threshold and a second current threshold; the step of comparing the operating current with the current threshold to obtain a comparison result includes: comparing the operating current with the first current Threshold value to obtain a first comparison result; and comparing the operating current and the second current threshold value to obtain a second comparison result.

In some embodiments, the step of determining the state of the auxiliary bearing according to the comparison result includes: when the first comparison result is that the operating current is less than or equal to the first current threshold and the second current threshold When the comparison result is that the operating current is less than the second current threshold, it is determined that the state of the auxiliary bearing is good; when the first comparison result is that the operating current is greater than the first current threshold and the When the second comparison result is that the operating current is less than or equal to the second current threshold, it is determined that the state of the auxiliary bearing is stuck; and when the first comparison result is that the operating current is greater than the first If the current threshold is current and the second comparison result is that the operating current is greater than the second current threshold, it is determined that the state of the auxiliary bearing is stuck.

In some embodiments, the detection method further includes: sending an early warning signal when the state of the auxiliary bearing is stuck; and sending an alarm signal when the state of the auxiliary bearing is stuck.

In some embodiments, the magnetic levitation system further includes a comparison circuit; the step of comparing the operating current and the current threshold of the motor to obtain a comparison result includes: using the comparison circuit to compare the operating current and the current threshold To get the comparison result.

In some embodiments, the comparison circuit includes a first comparator and a second comparator, and the current threshold includes a first current threshold and a second current threshold; the comparison circuit is used to compare the operating current and the current Threshold value to obtain the comparison result includes: the first comparator compares the operating current with the first current threshold value to output the first comparison result; and the second comparator compares the operating current It is compared with the second current threshold to output a second comparison result.

According to another aspect of the present disclosure, a detection device for a magnetic levitation system is provided. The magnetic levitation system includes a main shaft, a motor, an electromagnetic bearing, and an auxiliary bearing. The motor works to drive the main shaft to rotate, the electromagnetic bearing and the The auxiliary bearings are respectively arranged on the main shaft, the radius of the electromagnetic bearing is greater than the radius of the auxiliary bearing, and the detection device includes: a first control unit for controlling the electromagnetic bearing to stop working so that the main shaft On the auxiliary bearing; a second control unit for controlling the spindle to rotate at a predetermined speed; a detecting unit for detecting the working current of the motor; and a determining unit for determining the working current according to the working current State the state of the auxiliary bearing.

In some embodiments, the second control unit includes: a bearing controller, configured to send a detection instruction to the motor controller when the electromagnetic bearing is detected to stop working; The detection instruction controls the operating current of the motor so that the main shaft rotates at the predetermined rotation speed.

In some embodiments, the determining unit includes: a comparison subunit for comparing the operating current with a current threshold of the motor to obtain a comparison result; and a determining subunit for determining the operating current according to the comparison result The state of the auxiliary bearing.

In some embodiments, the comparison subunit includes a comparison circuit configured to compare the operating current and the current threshold to obtain the comparison result.

In some embodiments, the current threshold includes a first current threshold and a second current threshold, and the comparison subunit includes: a first comparator for comparing the operating current with the first current threshold to Outputting a first comparison electrical signal; and a second comparator for comparing the operating current with the second current threshold to output a second comparison electrical signal.

According to another aspect of the present disclosure, a non-transitory storage medium is provided, the storage medium includes a stored program, wherein the program executes any one of the detection methods.

According to another aspect of the present disclosure, there is provided a processor configured to run a program, wherein any one of the detection methods is executed when the program is running.

According to another aspect of the present disclosure, there is provided a magnetic levitation compressor, including: one or more processors, a memory, and one or more programs, wherein one or more of the programs are stored in the memory, And it is configured to be executed by one or more of the processors, and one or more of the programs include any one of the detection methods.

According to another aspect of the present disclosure, there is provided a magnetic levitation compressor including a detection device of a magnetic levitation system, and the detection device is any one of the detection devices.

Description of the drawings

The drawings of the specification constituting a part of the present disclosure are used to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

Figure 1 shows a schematic structural diagram of a magnetic levitation system according to some embodiments of the present disclosure;

Fig. 2 shows a flowchart of a detection method of a magnetic levitation system according to some embodiments of the present disclosure;

Figure 3 shows a side sectional view of the main shaft and auxiliary bearings in Figure 1;

Figure 4 shows a structural diagram of a magnetic levitation system according to some embodiments of the present disclosure; and

Fig. 5 shows a schematic diagram of a detection device of a magnetic levitation system according to some embodiments of the present disclosure.

Among them, the above drawings include the following reference signs:

10. Spindle; 20. Motor; 21. Motor rotor; 22. Motor stator; 30. Electromagnetic bearing; 40. Auxiliary bearing; 50. Bearing controller; 60. Motor controller; 70. Comparison circuit; 71. First comparison 72, the second comparator; 80, the current detection device; 90, the state monitoring device.

Detailed ways

It should be noted that the following detailed descriptions are all illustrative, and are intended to provide further descriptions of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs.

It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "including" are used in this specification, they indicate There are features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or intervening elements may also be present. Moreover, in the specification and claims, when it is described that an element is "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

One technical problem solved by the present disclosure is that the detection efficiency of the auxiliary bearing state in the technology known to the inventor of the present disclosure is relatively low.

In a typical implementation of the present disclosure, a detection method of a magnetic levitation system is provided. As shown in FIG. 1, the above-mentioned magnetic levitation system includes a main shaft 10, a motor 20, an electromagnetic bearing 30 and an auxiliary bearing 40. The motor 20 operates to drive the spindle 10 to rotate. The electromagnetic bearing 30 and the auxiliary bearing 40 are respectively provided on the main shaft 10. The radius of the electromagnetic bearing 30 is larger than the radius of the auxiliary bearing 40.

Fig. 2 is a flowchart of a detection method of a magnetic levitation system according to an embodiment of the present disclosure. As shown in Fig. 2, the method includes steps S101 to S104.

In step S101, it is detected whether the above-mentioned electromagnetic bearing 30 stops working.

In step S102, when it is detected that the electromagnetic bearing 30 stops working, the main shaft 10 is controlled to rotate at a predetermined speed.

In step S103, the operating current of the above-mentioned motor 20 is detected.

In step S104, the state of the auxiliary bearing 40 is determined according to the operating current.

In the above detection method, firstly detect whether the electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing; then, in the case of detecting that the electromagnetic bearing stops working, control the main shaft to rotate at a predetermined speed, that is, control the main shaft on the auxiliary bearing The upper part rotates at a predetermined speed; then the working current of the motor is detected; finally, the state of the auxiliary bearing is determined according to the working current. Since the auxiliary bearing is stuck or jammed, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the size of the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. In this way, it is possible to detect the status of the auxiliary bearing in real time, perform accurate maintenance, and reduce the maintenance and maintenance cost of the auxiliary bearing. Moreover, this can also try to avoid the problem that the life of the magnetic levitation system is reduced or even damaged due to the failure to replace the failed auxiliary bearing in time, thereby indirectly improving the life and reliability of the magnetic levitation system.

It should be noted that, as shown in FIG. 1, the above-mentioned motor 20 includes a motor rotor 21 and a motor stator 22. The motor rotor 21 is sleeved on the main shaft 10. The motor rotor 21, the electromagnetic bearing 30 and the auxiliary bearing 40 are spaced apart in the axial direction of the main shaft 10. The motor rotor 21 passes through the stator bore of the motor stator 22. The motor 20 operates to drive the spindle 10 to rotate. The specific working process is as follows. The motor stator 22 is powered on to drive the motor rotor 21 to rotate, and the motor rotor 21 rotates to drive the spindle 10 to rotate.

In some embodiments of the present disclosure, as shown in FIG. 1, the above-mentioned magnetic levitation system further includes a bearing controller 50 and a motor controller 60. The step of controlling the main shaft 10 to rotate at a predetermined speed includes: in the case of detecting that the electromagnetic bearing 30 stops working, the bearing controller 50 sends a detection instruction to the motor controller 60; and the motor controller 60 according to the above The detection command controls the operating current of the motor 20 so that the main shaft 10 rotates at the predetermined rotation speed. Specifically, in the case of detecting that the electromagnetic bearing stops working, it is determined that the main shaft falls on the auxiliary bearing, and then the bearing controller sends a detection instruction to the motor controller, and the motor controller controls the working current of the motor to make the main shaft rotate at a predetermined speed so that To detect the working current of the motor to determine the state of the auxiliary bearing.

It should be noted that, as shown in Figure 3, when the electromagnetic bearing is detected to stop working, that is, when the main shaft does not float and falls on the auxiliary bearing, the auxiliary bearing state detection can be performed. For example, in the magnetic suspension system After shutdown, or before starting the magnetic levitation system. More specifically, the status detection can be checked regularly, for example, once every six months or once a year; it can also be checked under certain circumstances, for example, after a failure of the magnetic levitation system.

In some embodiments of the present disclosure, the step of determining the state of the auxiliary bearing according to the working current includes: comparing the working current with the current threshold of the motor to obtain a comparison result; and determining the state of the auxiliary bearing according to the comparison result. Specifically, because the auxiliary bearing is stuck or stuck, the frictional force of the spindle rotation will increase, and the working current of the motor will increase. Therefore, according to the comparison result of the working current and the current threshold of the motor, the auxiliary bearing can be determined state. In addition, those skilled in the art can select an appropriate current threshold of the motor according to the actual situation.

In some embodiments of the present disclosure, the foregoing current threshold includes a first current threshold and a second current threshold. The step of comparing the operating current and the current threshold of the motor to obtain a comparison result includes: comparing the operating current and the first current threshold to obtain a first comparison result; and comparing the operating current and the second current threshold to obtain a second comparison result. Specifically, the operating current is compared with the first current threshold and the second current threshold, and the first comparison result and the second comparison result are obtained respectively, so as to determine the current range corresponding to the operating current, and then determine the corresponding current range according to the current range corresponding to the operating current. The state of the auxiliary bearing. The above-mentioned first current threshold and the second current threshold are both current thresholds of the motor. For example, the first current threshold is 30 amperes. For example, the second current threshold is 100 amperes. These two thresholds are just examples, and the specific thresholds can be determined according to the actual compressor model.

In some embodiments of the present disclosure, the step of determining the state of the auxiliary bearing based on the comparison result includes: when the first comparison result is that the operating current is less than or equal to the first current threshold, and the second comparison result is that the operating current is less than In the case of the second current threshold, it is determined that the condition of the auxiliary bearing is good; the first comparison result is that the operating current is greater than the first current threshold and the second comparison result is that the operating current is less than or equal to the second current In the case of a threshold value, it is determined that the state of the auxiliary bearing is stuck; and when the first comparison result is that the operating current is greater than the first current threshold value and the second comparison result is that the operating current is greater than the second current threshold value Next, make sure that the state of the above-mentioned auxiliary bearing is stuck. Specifically, the above three current ranges correspond to the states of the three auxiliary bearings, and the state of the auxiliary bearings can be determined by determining the current range corresponding to the operating current. Those skilled in the art can select the appropriate first current threshold and second current threshold according to actual conditions to further ensure the accuracy of the detection result.

In some embodiments of the present disclosure, the above detection method further includes: sending an early warning signal when the state of the auxiliary bearing is stuck; and sending an alarm signal when the state of the auxiliary bearing is stuck. In some embodiments, as shown in FIG. 4, the magnetic levitation system further includes a condition monitoring device 90. The state monitoring device 90 can display the state of the auxiliary bearing, and when the state of the auxiliary bearing 40 is stuck, the state monitoring device 90 sends out an early warning signal, and when the state of the auxiliary bearing 40 is stuck, the state monitoring device 90 Send out an alarm signal.

In some embodiments of the present disclosure, as shown in FIG. 4, the above-mentioned magnetic levitation system further includes a comparison circuit 70. The step of comparing the operating current a ₀ with the current threshold of the motor to obtain the comparison result includes: comparing the operating current a ₀ with the current threshold of the motor using a comparison circuit to obtain the comparison result. In some embodiments, as shown in FIG. 4, the magnetic levitation system further includes a current detection device 80. The current detection device 80 detects the operating current a _{0 of the} motor 20 and inputs the detection signal to the comparison circuit 70. The comparison circuit 70 compares the operating current a ₀ with the current threshold of the motor to obtain a comparison result.

In some embodiments of the present disclosure, as shown in FIG. 4, the aforementioned comparison circuit 70 includes a first comparator 71 and a second comparator 72. The above-mentioned current threshold includes a first current threshold a ₁ and a second current threshold a ₂ . The step of using the comparison circuit 70 to compare the operating current a ₀ and the current threshold to obtain the comparison result includes: the first comparator 71 compares the operating current a ₀ with the first current threshold a ₁ to output a first comparison Result; and the second comparator 72 compares the operating current a ₀ with the second current threshold a ₂ to output a second comparison result. Specifically, the detection signal of the current detection device 80 is input to the first comparator 71 and the second comparator 72, the first comparator 71 outputs the first comparison result, and the second comparator 72 outputs the second comparison result. result and the second comparison result to determine the operating current corresponding to the current range of a _0, to determine a corresponding auxiliary bearing state operating current according to a current range corresponding to a _0. The first current threshold a ₁ and the second current threshold a ₂ are both current thresholds of the motor.

In some embodiments of the present disclosure, the step of comparing the working current with the first current threshold by the first comparator to output a first comparison result includes: determining when the working current is less than or equal to the first current threshold The first comparison result is a low level; and when the operating current is greater than the first current threshold, it is determined that the first comparison result is a high level. Specifically, when the working current is less than or equal to the first current threshold, the first comparator outputs a low level, and when the working current is greater than the first current threshold, the first comparator outputs a high level, so that according to The outputted first comparison result determines the magnitude relationship between the working current and the first current threshold.

In some embodiments of the present disclosure, the step of comparing the operating current with the second current threshold by the second comparator to output a second comparison result includes: when the operating current is less than or equal to the second current threshold, determining The second comparison result is a low level; and when the operating current is greater than the second current threshold, it is determined that the second comparison result is a high level. Specifically, when the working current is less than or equal to the second current threshold, the second comparator outputs a low level, and when the working current is greater than the second current threshold, the second comparator outputs a high level, so that according to The output second comparison result determines the magnitude relationship between the operating current and the second current threshold.

In some embodiments of the present disclosure, the step of determining the state of the auxiliary bearing according to the comparison result includes: in the case where the first comparison result and the second comparison result are both low, determining that the state of the auxiliary bearing is Good; when the first comparison result is high and the second comparison result is low, it is determined that the state of the auxiliary bearing is stuck; the first comparison result and the second comparison result are both In the case of high level, it is determined that the state of the above-mentioned auxiliary bearing is stuck. Specifically, when the first comparison result and the second comparison result are both low, that is, the operating current is less than or equal to the first current threshold, it is determined that the state of the auxiliary bearing is good, and the first comparison result is high and When the second comparison result is low, that is, the working current is greater than the first current threshold and less than or equal to the second current threshold, it is determined that the state of the auxiliary bearing is stuck, and the first comparison result and the second comparison result are both high In the case of level, that is, the operating current is greater than the second current threshold, it is determined that the state of the auxiliary bearing is stuck.

It should be noted that the first current threshold and the second current threshold are pre-measured according to the device model of the magnetic levitation system. The range of the first current threshold and the second current threshold is different for different motor power and shaft weight. Those skilled in the art can determine the appropriate first current threshold and the second current threshold according to the actual situation, so as to further ensure the accuracy of the state detection of the auxiliary bearing.

It should also be noted that, depending on the device model of the magnetic levitation system, the above-mentioned predetermined speed range is also different. Those skilled in the art can determine a suitable predetermined rotation speed according to actual conditions, for example, 5r/s to 10r/s. Setting the predetermined rotation speed within the above range can prevent the auxiliary bearing from jamming due to excessive rotation speed and causing mechanical damage, and it can also prevent the rotation speed from being too low, resulting in insignificant changes in current and inaccurate detection.

The embodiment of the present disclosure also provides a detection device of the magnetic levitation system. As shown in FIG. 1, the above-mentioned magnetic levitation system includes a main shaft 10, a motor 20, an electromagnetic bearing 30 and an auxiliary bearing 40. The motor 20 operates to drive the spindle 10 to rotate. The electromagnetic bearing 30 and the auxiliary bearing 40 are respectively provided on the main shaft 10. The radius of the electromagnetic bearing 30 is larger than the radius of the auxiliary bearing 40. It should be noted that the detection device of the magnetic levitation system in the embodiment of the present disclosure may be used to execute the detection method of the magnetic levitation system provided in the embodiment of the present disclosure. The detection device of the magnetic levitation system provided by the embodiment of the present disclosure will be introduced below.

Fig. 5 is a schematic diagram of a detection device of a magnetic levitation system according to an embodiment of the present disclosure. The above detection device includes a first control unit 100, a second control unit 200, a detection unit 300, and a determination unit 400.

The first control unit 100 is used to control the electromagnetic bearing to stop working, so that the main shaft falls on the auxiliary bearing.

The second control unit 200 is used to control the above-mentioned spindle to rotate at a predetermined speed.

The detection unit 300 is used to detect the working current of the above-mentioned motor;

The determining unit 400 is used to determine the state of the auxiliary bearing according to the operating current.

In the detection device, the first control unit detects whether the electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing, and the second control unit controls the main shaft to rotate at a predetermined speed when detecting that the electromagnetic bearing stops working, That is, the main shaft is controlled to rotate at a predetermined speed on the auxiliary bearing, the detection unit detects the working current of the motor, and the determination unit determines the state of the auxiliary bearing according to the working current. Since the auxiliary bearing is stuck or jammed, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the size of the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. This can realize the real-time detection of the auxiliary bearing status, perform accurate maintenance, and reduce the maintenance and maintenance cost of the auxiliary bearing. And this can also try to avoid the problem that the life of the magnetic levitation system is reduced or even damaged due to the failure to replace the failed auxiliary bearing in time, thereby indirectly improving the life and reliability of the magnetic levitation system.

In some embodiments of the present disclosure, as shown in FIGS. 1 and 4, the above-mentioned second control unit includes a bearing controller 50 and a motor controller 60. The bearing controller 50 is used to send a detection command to the motor controller 60 when it is detected that the electromagnetic bearing 30 stops working. The motor controller 60 is configured to control the operating current a _{0 of} the motor 20 according to the detection instruction, so that the main shaft 10 rotates at the predetermined speed. Specifically, when the bearing controller detects that the electromagnetic bearing stops working, it determines that the main shaft falls on the auxiliary bearing, and then sends a detection instruction to the motor controller; the motor controller controls the working current a _{0 of the} motor to make the main shaft rotate at a predetermined speed , In order to detect the working current a _{0 of the} motor to determine the state of the auxiliary bearing.

It should be noted that when it is detected that the electromagnetic bearing stops working, that is, when the main shaft does not float and falls on the auxiliary bearing, the auxiliary bearing status can be detected, for example, after the magnetic levitation system is shut down, or the magnetic levitation system Before starting. More specifically, the status detection can be performed on a regular basis, for example, once every six months or once a year, or can be performed under specific circumstances, for example, after a magnetic levitation system fails.

In some embodiments of the present disclosure, the above determination unit includes a comparison subunit and a determination subunit. The comparison subunit is used to compare the working current with the current threshold of the motor to obtain a comparison result. The determination subunit is used to determine the state of the auxiliary bearing according to the comparison result. Specifically, because the auxiliary bearing is stuck or stuck, the friction force of the spindle rotation will increase, which will lead to the increase of the working current of the motor. According to the comparison result of the working current of the motor and the current threshold of the motor, the auxiliary bearing can be determined state. In addition, those skilled in the art can select an appropriate current threshold of the motor according to the actual situation.

It should be noted that in an actual application process, in some embodiments, the determination subunit may not exist, and the technician can determine the state of the corresponding auxiliary bearing according to the comparison result of the comparison subunit. In some other embodiments, the above-mentioned determining subunit may also be some indirect determining devices. For example, the determining subunit is implemented by a hardware circuit. For example, the determining subunit may include several indicator lights of different colors. Different comparison results will trigger different indicator lights. In this way, the staff can determine the status of the auxiliary bearing through the brightness of different indicator lights. The same is true for the following deterministic modules, which are optional and can be implemented by hardware circuits.

In some embodiments of the present disclosure, the foregoing current threshold includes a first current threshold and a second current threshold. The above comparison subunit includes a first comparison module and a second comparison module. The first comparison module is used to compare the operating current and the first current threshold to obtain a first comparison result. The second comparison module is used to compare the operating current and the second current threshold to obtain a second comparison result. Specifically, the operating current is compared with the first current threshold and the second current threshold, and the first comparison result and the second comparison result are obtained respectively, so as to determine the current range corresponding to the operating current, and then determine the corresponding current range according to the current range corresponding to the operating current. The state of the auxiliary bearing. The above-mentioned first current threshold and the second current threshold are both current thresholds of the motor.

In some embodiments of the present disclosure, the above-mentioned determining subunit includes a first determining module, a second determining module, and a third determining module. The first determining module is configured to determine the state of the auxiliary bearing when the first comparison result is that the operating current is less than or equal to the first current threshold and the second comparison result is that the operating current is less than the second current threshold. For good. The second determining module is configured to determine the state of the auxiliary bearing when the first comparison result is that the operating current is greater than the first current threshold and the second comparison result is that the operating current is less than or equal to the second current threshold. For Caton. The third determining module is configured to determine that the state of the auxiliary bearing is when the first comparison result is that the operating current is greater than the first current threshold and the second comparison result is that the operating current is greater than the second current threshold. Stuck. Specifically, the above three current ranges correspond to the states of the three auxiliary bearings, and the state of the auxiliary bearings can be determined by determining the current range corresponding to the operating current. Those skilled in the art can select the appropriate first current threshold and second current threshold according to actual conditions to further ensure the accuracy of the detection result.

In some embodiments of the present disclosure, the above detection device further includes a prompt unit. The above-mentioned prompting unit includes a first prompting subunit and a second prompting subunit. The first prompting subunit is used to send an early warning signal when the state of the auxiliary bearing is stuck. The second prompting subunit is used to send an alarm signal when the state of the auxiliary bearing is stuck. Specifically, as shown in FIG. 4, the magnetic levitation system further includes a state monitoring device 90. The state monitoring device 90 can display the state of the auxiliary bearing, and when the state of the auxiliary bearing 40 is stuck, the state monitoring device 90 sends out an early warning signal, and when the state of the auxiliary bearing 40 is stuck, the state monitoring device 90 Send out an alarm signal.

In some embodiments of the present disclosure, as shown in FIG. 4, the aforementioned comparison subunit includes a comparison circuit 70. The comparison circuit 70 is used to compare the operating current a ₀ with the current threshold of the motor to obtain the comparison result. Specifically, the magnetic levitation system further includes a current detection device 80. The current detection device 80 detects the working current a _{0 of the} motor 20 and inputs the detection signal to the comparison circuit 70. The comparison circuit 70 compares the working current a ₀ with the current threshold of the motor to obtain a comparison result.

In some embodiments of the present disclosure, as shown in FIG. 4, the aforementioned comparison circuit 70 includes a first comparator 71 and a second comparator 72. The above-mentioned current threshold includes a first current threshold a ₁ and a second current threshold a ₂ . The first comparator 71 is used to compare the operating current with the first current threshold a ₁ to output a first comparison electrical signal. The second comparator 72 is used to compare the operating current a ₀ with the second current threshold a ₂ to output a second comparison electrical signal. Specifically, the detection signal of the current detection device 80 is input to the first comparator 71 and the second comparator 72, the first comparator 71 outputs a first comparative electric signal, and the second comparator 72 outputs a second comparative electric signal, according to the first comparator 71 and the second comparator 72. a comparator comparing a second electrical signal to an electrical signal and determining the operating current corresponding to the current range of a _0, to determine a corresponding auxiliary bearing state operating current according to a current range corresponding to a _0. The first current threshold a ₁ and the second current threshold a ₂ are both current thresholds of the motor.

It should be noted that when the working current is less than or equal to the first current threshold, it is determined that the first comparison electrical signal is at a low level; when the working current is greater than the first current threshold, the second comparison is determined The electrical signal is high. That is to say, when the working current is less than or equal to the first current threshold, the first comparator outputs a low level, and when the working current is greater than the first current threshold, the first comparator outputs a high level, so The magnitude relationship between the working current and the first current threshold is determined according to the output first comparison result.

It should also be noted that in the case where the operating current is less than or equal to the second current threshold, the second comparison electrical signal is determined to be a low level; in the case where the operating current is greater than the second current threshold, it is determined that the second The comparison electrical signal is at a high level. In other words, in the case where the operating current is less than or equal to the second current threshold, the second comparator outputs a low level, and in the case where the operating current is greater than the second current threshold, the second comparator outputs a high level, so The magnitude relationship between the operating current and the second current threshold is determined according to the output second comparison result.

In some embodiments of the present disclosure, the aforementioned determining subunit includes a fourth determining module, a fifth determining module, and a sixth determining module. The fourth determining module is configured to determine that the state of the auxiliary bearing is good when the first comparison result and the second comparison electrical signal are both low. The fifth determining module is configured to determine that the state of the auxiliary bearing is stuck when the first comparison electrical signal is at a high level and the second comparison electrical signal is at a low level. The sixth determining module is configured to determine that the state of the auxiliary bearing is stuck when the first comparison electrical signal and the second comparison electrical signal are both at a high level. Specifically, when the first comparison result and the second comparison electrical signal are both low, that is, the operating current is less than or equal to the first current threshold, it is determined that the state of the auxiliary bearing is good, and the first comparison electrical signal is high. When the second comparison electrical signal is at a low level, that is, the working current is greater than the first current threshold and less than or equal to the second current threshold, it is determined that the state of the auxiliary bearing is stuck, and the first comparison electrical signal and the second comparison When the electrical signals are all high, that is, the working current is greater than the second current threshold, it is determined that the state of the auxiliary bearing is stuck.

The embodiment of the present disclosure also provides a magnetic levitation compressor, including: one or more processors, a memory, and one or more programs, wherein one or more of the above-mentioned programs are stored in the above-mentioned memory and configured to be One or more of the above-mentioned processors are executed, and one or more of the above-mentioned programs are used to execute any one of the above-mentioned detection methods.

In the above-mentioned magnetic levitation compressor, during the execution of the program, it is first detected whether the above-mentioned electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing, and then when it is detected that the above-mentioned electromagnetic bearing stops working, the main shaft is controlled to rotate at a predetermined speed. That is, the main shaft is controlled to rotate at a predetermined speed on the auxiliary bearing, and then the working current of the motor is detected, and finally the state of the auxiliary bearing is determined according to the working current. Since the auxiliary bearing is stuck or jammed, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the size of the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. In this way, it is possible to detect the status of the auxiliary bearing in real time, perform accurate maintenance, and reduce the maintenance and maintenance cost of the auxiliary bearing. And this can also try to avoid the problem that the life of the magnetic levitation system is reduced or even damaged due to the failure to replace the failed auxiliary bearing in time, thereby indirectly improving the life and reliability of the magnetic levitation system.

The embodiment of the present disclosure also provides a magnetic levitation compressor including a detection device of the magnetic levitation system. The above-mentioned detection device is any one of the above-mentioned detection devices.

The magnetic levitation compressor includes a detection device of the magnetic levitation system. The first control unit of the detection device detects whether the electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing. The second control unit of the detection device detects the electromagnetic bearing. When the bearing stops working, the main shaft is controlled to rotate at a predetermined speed, that is, the main shaft is controlled to rotate at a predetermined speed on the auxiliary bearing. The detection unit detects the working current of the motor, and the determination unit of the detection device determines the state of the auxiliary bearing according to the working current. Since the auxiliary bearing is stuck or jammed, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the size of the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. In this way, it is possible to detect the status of the auxiliary bearing in real time, perform accurate maintenance, and reduce the maintenance and maintenance cost of the auxiliary bearing. And this can also try to avoid the problem that the life of the magnetic levitation system is reduced or even damaged due to the failure to replace the failed auxiliary bearing in time, thereby indirectly improving the life and reliability of the magnetic levitation system.

The above detection device includes a processor and a memory. The above-mentioned first control unit, second control unit, detection unit, and determination unit are all stored in the memory as program units. The processor executes the above program unit stored in the memory to realize the corresponding function.

The processor contains the kernel, and the kernel calls the corresponding program unit from the memory. For example, one or more cores can be provided in the processor.

The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory includes at least one memory chip.

The embodiment of the present disclosure provides a non-transitory storage medium on which a program is stored, and when the program is executed by a processor, the foregoing detection device is realized.

The embodiment of the present disclosure provides a processor, and the above-mentioned processor is used to run a program, wherein the above-mentioned detection device is executed when the above-mentioned program is running.

The embodiment of the present disclosure provides a device that includes a processor, a memory, and a program stored on the memory and capable of running on the processor, and the processor implements at least the following steps S101 to S104 when the program is executed.

The equipment in this article can be a server, a PC (Personal Computer), a PAD (that is, a tablet computer), a mobile phone, and so on.

The present disclosure also provides a computer program product, which when executed on a data processing device, is suitable for executing a program that initializes at least the following method steps S101 to S104.

Those skilled in the art should understand that the embodiments of the present disclosure can be provided as a method, a system, or a computer program product. Therefore, the present disclosure may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

The present disclosure is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

In a typical configuration, the computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media include permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include transitory media, such as modulated data signals and carrier waves.

It should also be noted that the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or equipment including a series of elements not only includes those elements, but also includes Other elements that are not explicitly listed, or also include elements inherent to such processes, methods, commodities, or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, commodity, or equipment that includes the element.

From the above description, it can be seen that the above-mentioned embodiments of the present disclosure achieve the following technical effects.

1). In the detection method of the present disclosure, firstly, it is detected whether the above-mentioned electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing, and then when the above-mentioned electromagnetic bearing stops working, the main shaft is controlled to rotate at a predetermined speed, namely Control the main shaft to rotate at a predetermined speed on the auxiliary bearing, then detect the working current of the motor, and finally determine the state of the auxiliary bearing according to the working current. Since the auxiliary bearing is stuck or jammed, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the size of the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. In this way, real-time detection of the auxiliary bearing status and accurate maintenance can be realized, and the maintenance and maintenance cost of the auxiliary bearing can be reduced. Moreover, this can also avoid the problem of reduced or even damage to the life of the maglev system due to failure to replace the failed auxiliary bearings in time, thereby indirectly improving the life and reliability of the maglev system.

2) In the detection device of the present disclosure, the first control unit detects whether the electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing, and the second control unit controls the main shaft when detecting that the electromagnetic bearing stops working Rotating at a predetermined speed, that is, controlling the main shaft to rotate at a predetermined speed on the auxiliary bearing, the detecting unit detects the working current of the motor, and the determining unit determines the state of the auxiliary bearing according to the working current. Since the auxiliary bearing is stuck or jammed, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the size of the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. In this way, real-time detection of the auxiliary bearing status and accurate maintenance can be realized, and the maintenance and maintenance cost of the auxiliary bearing can be reduced. Moreover, this can also avoid the problem of reduced or even damage to the life of the maglev system due to failure to replace the failed auxiliary bearings in time, thereby indirectly improving the life and reliability of the maglev system.

3). In the magnetic levitation compressor of the present disclosure, during the execution of the program, firstly detect whether the electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing, and then control the main shaft when it is detected that the electromagnetic bearing stops working Rotate at a predetermined speed, that is, control the main shaft to rotate at a predetermined speed on the auxiliary bearing, then detect the working current of the motor, and finally determine the state of the auxiliary bearing according to the working current. As the auxiliary bearing stalls or jams, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. In this way, it is possible to detect the status of the auxiliary bearing in real time, perform accurate maintenance, and reduce the maintenance and maintenance cost of the auxiliary bearing. Moreover, this can also avoid the problem of reduced or even damage to the life of the maglev system due to failure to replace the failed auxiliary bearings in time, thereby indirectly improving the life and reliability of the maglev system.

4) The magnetic levitation compressor of the present disclosure includes a detection device of the magnetic levitation system. The first control unit of the detection device detects whether the electromagnetic bearing stops working to determine whether the main shaft falls on the auxiliary bearing. The second control unit of the detection device In the case of detecting that the above electromagnetic bearing stops working, control the spindle to rotate at a predetermined speed, that is, control the spindle to rotate at a predetermined speed on the auxiliary bearing, the detection unit detects the working current of the motor, and the determination unit of the detection device determines the auxiliary bearing according to the working current status. Since the auxiliary bearing is stuck or jammed, the working current of the motor will increase, so the state of the auxiliary bearing is determined according to the size of the working current of the motor, thereby improving the efficiency of detecting the state of the auxiliary bearing. In this way, real-time detection of the auxiliary bearing status and accurate maintenance can be realized, and the maintenance and maintenance cost of the auxiliary bearing can be reduced. Moreover, this can also avoid the problem of reduced or even damage to the life of the maglev system due to failure to replace the failed auxiliary bearings in time, thereby indirectly improving the life and reliability of the maglev system.

Some embodiments of the present disclosure are described above, and these embodiments are not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

A detection method of a magnetic levitation system, wherein the magnetic levitation system includes a main shaft, a motor, an electromagnetic bearing and an auxiliary bearing, the motor works to drive the main shaft to rotate, and the electromagnetic bearing and the auxiliary bearing are respectively arranged on the main shaft Above, the radius of the electromagnetic bearing is greater than the radius of the auxiliary bearing, and the detection method includes:

Detecting whether the electromagnetic bearing stops working;

In the case of detecting that the electromagnetic bearing stops working, controlling the main shaft to rotate at a predetermined speed;

Detecting the working current of the motor; and

The state of the auxiliary bearing is determined according to the operating current.
The detection method according to claim 1, wherein the magnetic levitation system further comprises a bearing controller and a motor controller; the step of controlling the main shaft to rotate at a predetermined speed comprises:

In the case of detecting that the electromagnetic bearing stops working, the bearing controller sends a detection instruction to the motor controller; and

The motor controller controls the operating current of the motor according to the detection instruction, so that the main shaft rotates at the predetermined speed.
The detection method according to claim 1, wherein the step of determining the state of the auxiliary bearing according to the operating current comprises:

Comparing the operating current with the current threshold of the motor to obtain a comparison result; and

The state of the auxiliary bearing is determined based on the comparison result.
3. The detection method according to claim 3, wherein the current threshold includes a first current threshold and a second current threshold; and the step of comparing the operating current and the current threshold to obtain a comparison result comprises:

Comparing the operating current and the first current threshold to obtain a first comparison result; and

The operating current and the second current threshold are compared to obtain a second comparison result.
The detection method according to claim 4, wherein the step of determining the state of the auxiliary bearing according to the comparison result comprises:

In the case where the first comparison result is that the operating current is less than or equal to the first current threshold and the second comparison result is that the operating current is less than the second current threshold, the state of the auxiliary bearing is determined For good

In the case where the first comparison result is that the operating current is greater than the first current threshold and the second comparison result is that the operating current is less than or equal to the second current threshold, the state of the auxiliary bearing is determined Is lagging; and

In a case where the first comparison result is that the operating current is greater than the first current threshold and the second comparison result is that the operating current is greater than the second current threshold, it is determined that the state of the auxiliary bearing is Stuck.
The detection method according to claim 5, further comprising:

If the state of the auxiliary bearing is stuck, an early warning signal is issued; and

When the state of the auxiliary bearing is stuck, an alarm signal is issued.
The detection method according to claim 4, wherein the magnetic levitation system further comprises a comparison circuit; the step of comparing the operating current and the current threshold of the motor to obtain a comparison result comprises:

The comparison circuit is used to compare the operating current and the current threshold to obtain the comparison result.
The detection method according to claim 7, wherein the comparison circuit includes a first comparator and a second comparator, and the current threshold includes a first current threshold and a second current threshold; and the comparison circuit compares the The step of operating current and the current threshold to obtain the comparison result includes:

The first comparator compares the operating current with the first current threshold to output a first comparison result; and

The second comparator compares the operating current with the second current threshold to output a second comparison result.
A detection device for a magnetic levitation system, wherein the magnetic levitation system includes a main shaft, a motor, an electromagnetic bearing, and an auxiliary bearing. The motor works to drive the main shaft to rotate, and the electromagnetic bearing and the auxiliary bearing are respectively arranged on the main shaft. Above, the radius of the electromagnetic bearing is greater than the radius of the auxiliary bearing, and the detection device includes:

The first control unit is used to control the electromagnetic bearing to stop working, so that the main shaft falls on the auxiliary bearing;

The second control unit is used to control the main shaft to rotate at a predetermined speed;

A detection unit for detecting the working current of the motor; and

The determining unit is configured to determine the state of the auxiliary bearing according to the operating current.
The detection device according to claim 9, wherein the second control unit comprises:

The bearing controller is used to send a detection instruction to the motor controller when detecting that the electromagnetic bearing stops working; and

The motor controller is configured to control the operating current of the motor according to the detection instruction, so that the main shaft rotates at the predetermined speed.
The detection device according to claim 9, wherein the determining unit comprises:

A comparison subunit for comparing the operating current with the current threshold of the motor to obtain a comparison result; and

The determining subunit is used to determine the state of the auxiliary bearing according to the comparison result.
11. The detection device according to claim 11, wherein the comparison subunit comprises a comparison circuit, and the comparison circuit is used to compare the operating current and the current threshold to obtain the comparison result.
The detection device according to claim 12, wherein the current threshold includes a first current threshold and a second current threshold, and the comparison circuit includes:

A first comparator, configured to compare the operating current with the first current threshold to output a first comparison electrical signal; and

The second comparator is used to compare the operating current with the second current threshold to output a second comparison electrical signal.
A non-transitory storage medium, wherein the storage medium includes a stored program, wherein the program executes the detection method according to any one of claims 1 to 8.
A processor, wherein the processor is used to run a program, wherein the detection method according to any one of claims 1 to 8 is executed when the program is running.
A magnetic levitation compressor includes: one or more processors, a memory, and one or more programs, wherein one or more of the programs are stored in the memory and configured to be operated by one or more The processor executes, and one or more of the programs includes a detection method for executing any one of claims 1 to 8.
A magnetic levitation compressor includes a detection device of a magnetic levitation system, and the detection device is the detection device according to any one of claims 9 to 13.