CN112067995A

CN112067995A - Detection device and detection method of magnetic suspension motor and magnetic suspension motor

Info

Publication number: CN112067995A
Application number: CN202010952492.XA
Authority: CN
Inventors: 贺伟衡
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd; Guangdong Midea HVAC Equipment Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-12-11

Abstract

The invention provides a detection device and a detection method of a magnetic suspension motor and the magnetic suspension motor, wherein the detection device of the magnetic suspension motor comprises: at least two detection devices arranged at intervals along the rotation direction of the rotating shaft and used for detecting sampling signals when the rotating shaft rotates; and the control device is used for determining the rotating direction of the rotating shaft according to the sampling signal. Through setting up detection device, utilize the sampling signal that detection device detected to confirm the direction of rotation axis, broken away from and can't confirm the direction of rotation axis in the present stage to cause the reversal to appear in the magnetic levitation motor, cause the magnetic levitation motor to be located the system trouble, influence system life and influence the problem that user used and experienced.

Description

Detection device and detection method of magnetic suspension motor and magnetic suspension motor

Technical Field

The invention relates to the technical field of magnetic suspension motor control, in particular to a detection device and a detection method of a magnetic suspension motor, the magnetic suspension motor and a computer readable storage medium.

Background

In the related technical scheme, after the motor is connected, the rotating shaft of the motor starts to rotate so as to output driving force or drive other electrical appliances to operate.

In general, in the case of a wiring error of a motor, a rotating shaft rotates in a direction opposite to a preset rotating direction, that is, there is a reverse rotation, and the motor side cannot determine whether the rotating shaft is reversed according to a feedback signal of the motor, and the reverse rotation of the rotating shaft easily causes a failure of a system where the motor is located, and causes a system instability and the like.

Therefore, how to determine the rotation direction of the rotating shaft is a problem that needs to be solved.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, an aspect of the present invention is to provide a detection apparatus for a magnetic levitation motor.

One aspect of the present invention provides a method for detecting a magnetic levitation motor.

In one aspect of the invention, a detection device for a magnetic levitation motor is provided.

One aspect of the present invention is to provide a magnetic levitation motor.

One aspect of the present invention is to provide a computer-readable storage medium.

In view of the above, according to a first aspect of the present invention, there is provided a detection apparatus for a magnetic levitation motor, the magnetic levitation motor including a rotating shaft, the detection apparatus for a magnetic levitation motor comprising: at least two detection devices arranged at intervals along the rotation direction of the rotating shaft and used for detecting sampling signals when the rotating shaft rotates; and the control device is used for determining the rotating direction of the rotating shaft according to the sampling signal.

The technical scheme of the invention provides a detection device of a magnetic suspension motor, which can detect the rotation direction of a rotating shaft of the magnetic suspension motor.

In the technical scheme of this application, through setting up detection device, utilize the sampling signal that detection device detected to confirm the direction of rotation axis, broken away from the rotation direction that can't confirm the rotation axis in the present stage to cause the reversal to appear in the magnetic levitation motor, cause the magnetic levitation motor to be in system's trouble, influence system life and influence the problem that the user used and experienced.

In addition, the detection device for the magnetic suspension motor in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, the control device is specifically configured to: determining the duty ratio of the sampling signal according to the sampling signal; and determining the rotation direction of the rotating shaft according to the comparison result of the duty ratio of the sampling signal and a preset duty ratio threshold value.

In this technical solution, a method for determining a rotation direction of a rotating shaft using a duty ratio of a sampling signal is proposed, in which the rotation direction of the rotating shaft is represented using a comparison result between the duty ratio of the sampling signal and a preset duty ratio threshold.

Specifically, the duty ratio of the sampling signal and the corresponding relationship between the duty ratio threshold comparison result and the rotation direction of the rotating shaft may be preset, so that after the sampling signal is received, the sampling information is analyzed to obtain the duty ratio corresponding to the sampling signal, and the duty ratio is compared with the duty ratio threshold to obtain the rotation direction of the rotating shaft.

In any of the above technical solutions, the control device is specifically configured to: determining that the duty ratio of the sampling signal is greater than a duty ratio threshold value, and rotating the rotating shaft along a first direction; and determining that the duty ratio of the sampling signal is smaller than the duty ratio threshold value, and rotating the rotating shaft in the second direction.

In this embodiment, after the comparison result is determined based on the duty ratio and the duty ratio threshold, the rotation direction of the rotating shaft can be obtained by combining the preset correspondence between the rotation direction of the rotating shaft and the comparison result. In the process, the determination process of the rotation direction is simple, and the running reliability of the system where the magnetic suspension motor is located is improved.

In any of the above technical solutions, the number of the detection devices is two, and the control device is specifically configured to: determining a level signal corresponding to any sampling signal, wherein the level signals corresponding to the sampling signals detected by the two detection devices are opposite; determining a first time length for converting the level signal from a low level signal to a high level signal and a second time length for converting the high level signal to the low level signal; confirming a third time length between two adjacent high-level signals and a fourth time length between two adjacent low-level signals; and taking the ratio of the first time length to the third time length as the duty ratio of the sampling signal, or taking the ratio of the second time length to the fourth time length as the duty ratio of the sampling signal.

In the technical scheme, the running state of the rotating shaft can be determined in a mode of the sequence in which the two detection devices can be triggered in sequence, the detection needs to be carried out at the initial stage of the rotation of the rotating shaft, specifically, when the detection devices are used for detection, the rotating speed of the rotating shaft is very high, the sequence of sampling signals is difficult to judge, the requirement on detection opportunity is high, and the sampling signals are difficult to capture in the actual detection process.

In order to solve the above problem, since the signals generated when the same detection device detects a certain position of the rotating shaft are the same, two adjacent high level signals or two adjacent low level signals can be used as the time taken for the rotating shaft to rotate for one circle, so as to obtain the rotation period of the rotating shaft, since a certain position of the rotating shaft is continuously detected by the same detection device, and is inevitably detected by another detection device, that is, a low level signal is inevitably present between two adjacent high level signals, the setting condition of the interval of the two detection devices in the rotation direction of the rotating shaft can be represented according to the first duration of the level signal rising from the low level signal to the high level signal, and the rotation direction of the rotating shaft can be represented according to the first duration, in the process, the determination process of the rotation direction of the rotating shaft is simple, the detection device can adopt a chip with low calculation power or processing capability as a control device, thereby reducing the manufacturing cost of the detection device.

Similarly, the duty ratio of the sampling signal may also be determined according to a second time period during which the level signal changes from the high level signal to the low level signal and a fourth time period, wherein the fourth time period is a time period between two adjacent low level signals.

In any of the above technical solutions, the control device is specifically configured to: outputting a high-level signal based on whether the sampling value indicated by any sampling signal is less than or equal to a first signal threshold value; and outputting a low level signal based on the sampling value indicated by any sampling signal being larger than a second signal threshold value, wherein the first signal threshold value is smaller than the second signal threshold value.

In the technical scheme, signal interference may exist in the sampling signal in the determination process of the sampling signal, in order to reduce the influence of the partial interference on the determination process of the high-level signal and the low-level signal, the technical scheme of the application defines two parameters, namely a first signal threshold and a second signal threshold, and judges whether the sampling signal is the high-level signal or the low-level signal by using the two parameters.

Specifically, based on the sampling value indicated by any one of the sampling signals being less than or equal to the first signal threshold, outputting a high level signal; and outputting a low level signal based on the sampling value indicated by any sampling signal being larger than a second signal threshold value, wherein the first signal threshold value is smaller than the second signal threshold value.

In any of the above technical solutions, the control device is further configured to: comparing the rotation direction of the rotating shaft with the set rotation direction; outputting correct connection information based on the fact that the rotating direction of the rotating shaft is consistent with the set rotating direction; and outputting connection error information based on the fact that the rotation direction of the rotating shaft is not consistent with the set rotation direction.

In the technical scheme, the rotation direction of the rotating shaft is compared with the set rotation direction, so that the connection error information is output under the condition that the comparison result is inconsistent, a user can conveniently process the connection fault in time, and the influence of the connection problem of the magnetic suspension motor on the running reliability of a system where the magnetic suspension motor is located is reduced.

In any of the above technical solutions, a recess is formed in a circumferential direction of the rotating shaft; the detection device is an eddy current sensor, and generates a detection signal based on the fact that the recess rotates into a detection area of the eddy current sensor.

In the technical scheme, the circumferential direction of the rotating shaft is provided with the depression, so that the detection signal is generated by the detection of the eddy current sensor, and the information can be conveniently determined by a user without arranging an induced piece in the circumferential direction of the rotating shaft independently, and therefore, the manufacturing cost of the detection device of the magnetic suspension motor can be reduced.

According to a second aspect of the present invention, there is provided a method of detecting a magnetically levitated motor, the magnetically levitated motor including a rotating shaft, the method comprising: controlling at least two detection devices arranged at intervals along the rotation direction of the rotating shaft to detect sampling signals when the rotating shaft rotates; and determining the rotation direction of the rotating shaft according to the sampling signal.

The technical scheme of the invention provides a detection method of a magnetic suspension motor, which can detect the rotation direction of a rotating shaft of the magnetic suspension motor, and particularly, the rotation direction of the rotating shaft is determined by using a sampling signal detected by a detection device, so that the problems that the rotation direction of the rotating shaft cannot be determined in the prior art, the magnetic suspension motor is reversed, the system where the magnetic suspension motor is located is in a fault, the service life of the system is influenced, and the use experience of a user is influenced are solved.

In addition, the detection method of the magnetic suspension motor in the above technical scheme provided by the invention can also have the following additional technical characteristics:

in the above technical solution, the step of determining the rotation direction of the rotation axis according to the sampling signal specifically includes: determining the duty ratio of the sampling signal according to the sampling signal; and determining the rotation direction of the rotating shaft according to the comparison result of the duty ratio of the sampling signal and a preset duty ratio threshold value.

In any of the above technical solutions, the step of determining the rotation direction of the rotating shaft according to the comparison result between the duty ratio of the sampling signal and the preset duty ratio threshold specifically includes: determining that the duty ratio of the sampling signal is larger than a duty ratio threshold value, and rotating the rotating shaft along a first direction; and determining that the duty ratio of the sampling signal is smaller than a duty ratio threshold value, and rotating the rotating shaft in the second direction.

In the technical scheme, the rotating shaft has only two rotating directions, namely a first rotating direction and a second rotating direction, and specifically, when the duty ratio corresponding to the determined sampling signal is greater than the duty ratio threshold value, the rotating direction of the current rotating shaft is determined to be the first direction; and when the duty ratio corresponding to the determined sampling signal is smaller than the duty ratio threshold, the current rotation direction of the rotating shaft is determined to be the second direction, in the process, the determination process of the rotation direction of the rotating shaft only needs to compare the duty ratio corresponding to the determined sampling signal with the duty ratio threshold, namely, the comparison of the numerical value is carried out, and the data processing amount is small.

After the comparison result is determined based on the duty ratio and the duty ratio threshold, the rotation direction of the rotating shaft can be obtained by combining the preset correspondence between the rotation direction of the rotating shaft and the comparison result. In the process, the determination process of the rotation direction is simple, and the running reliability of the system where the magnetic suspension motor is located is improved.

In any of the above technical solutions, the number of the detection devices is two, and the step of determining the duty ratio of the sampling signal according to the sampling signal specifically includes:

determining a level signal corresponding to any sampling signal, wherein the level signals corresponding to the sampling signals detected by the two detection devices are opposite; determining a first time length for converting the level signal from a low level signal to a high level signal and a second time length for converting the high level signal to the low level signal; confirming a third time length between two adjacent high-level signals and a fourth time length between two adjacent low-level signals; and taking the ratio of the first time length to the third time length as the duty ratio of the sampling signal, or taking the ratio of the second time length to the fourth time length as the duty ratio of the sampling signal.

In the technical scheme, in the process of determining the duty ratio of the sampling signal, the rotating shaft needs to be controlled to rotate for one circle so as to know the time required by the rotating shaft to rotate for one circle, since the rotation shaft is detected by the detection device in the technical scheme of the application, therefore, in order to reduce the number of sampled signals that need to be processed, it is necessary to know the minimum magnitude of the sampled signals in determining the duty cycle, since the number of sampling signals is related to the number of detection means, it is necessary to determine the minimum number value of the detection means, control the number of detected sampling signals by defining the number of detection means, and further determining the minimum components required to achieve the above-mentioned effects so as to achieve the above-mentioned functions with the minimum components, in this process, the manufacturing cost of the detection device for detecting the magnetic levitation motor is reduced by determining the number of the detection devices.

Specifically, during the rotation of the rotating shaft, the operating state of the rotating shaft, i.e., the rotating direction, may be determined according to the sequence in which at least two detection devices, which are disposed at intervals along the rotating direction of the rotating shaft, are sequentially activated. In order to distinguish the sampling signals corresponding to the two detection devices, it is defined that the level signals corresponding to the sampling signals detected by the two detection devices are opposite, that is, after one of the two detection devices detects a certain position of the rotating shaft, the corresponding sampling signal is a high level signal or a low level signal, and after the other of the two detection devices detects the same position of the rotating shaft, the corresponding sampling signal is a low level signal or a high level signal.

Based on the above, the running state of the rotating shaft can be determined by adopting the sequence in which the two detection devices are sequentially triggered, and the detection needs to be performed at the initial stage of the rotation of the rotating shaft.

In order to solve the above problem, a current rotation direction is represented by a conversion state of a level signal corresponding to a sampling signal, specifically, when a rotation axis rotates for one circle, one of two detection devices first detects a certain position of the rotation axis, the other of the two detection devices detects the same position of the rotation axis along with the rotation of the rotation axis, and the detection device which first detects the certain position of the rotation axis along with the rotation of the rotation axis detects the position again. Because the signals generated when one detection device detects a certain position of the rotating shaft are the same, two adjacent high level signals or two adjacent low level signals can be used as the time taken for the rotating shaft to rotate for one circle, and then the rotating period of the rotating shaft can be obtained.

Therefore, the interval arrangement condition of the two detection devices in the rotating direction of the rotating shaft can be represented according to the first time length of the level signal rising from the low level signal to the high level signal, and then the rotating direction of the rotating shaft can be represented according to the first time length.

In addition, in order to ensure the detection precision and reduce the possible deviation in the first time length determination process to cause inaccurate detection results, the ratio of the first time length to the third time length, namely the duty ratio of the sampling signal, can be calculated, and the rotation direction of the rotating shaft is judged by using the ratio.

In any of the above technical solutions, the step of determining a level signal corresponding to any one of the sampling signals specifically includes: outputting a high-level signal based on whether the sampling value indicated by any sampling signal is less than or equal to a first signal threshold value; and outputting a low level signal based on the sampling value indicated by any sampling signal being larger than a second signal threshold value, wherein the first signal threshold value is smaller than the second signal threshold value.

In any of the above technical solutions, the method further includes: comparing the rotation direction of the rotating shaft with the set rotation direction; outputting correct connection information based on the fact that the rotating direction of the rotating shaft is consistent with the set rotating direction; and outputting connection error information based on the fact that the rotation direction of the rotating shaft is not consistent with the set rotation direction.

According to a third aspect of the present invention, there is provided a detection apparatus for a magnetic levitation motor, comprising: a memory having a computer program stored thereon; a controller executing a computer program to implement the steps of the method of detecting a magnetic levitation motor as claimed in any one of the above.

The technical scheme of the present invention provides a detection apparatus for a magnetic levitation motor, wherein the detection apparatus for a magnetic levitation motor comprises a memory and a controller, and the controller executes a computer program to implement the steps of any one of the above detection methods for a magnetic levitation motor.

According to a fourth aspect of the present invention, there is provided a magnetic levitation motor comprising: a rotating shaft having a recess formed in a circumferential direction thereof; a detection apparatus for a magnetic levitation motor as claimed in any one of the preceding claims.

The technical scheme of the present invention provides a magnetic suspension motor, wherein the magnetic suspension motor includes a rotating shaft and a detection device of the magnetic suspension motor, and the detection device of the magnetic suspension motor has all the beneficial technical effects of the steps of the detection method of any one of the above magnetic suspension motors.

According to a fifth aspect of the invention, the invention provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method of detection of a magnetic levitation motor as defined in any one of the preceding claims.

The technical solution of the present invention is to provide a storage medium, wherein the medium can be identified and read by a computer, and when the stored computer program is executed, the storage medium has all the beneficial technical effects of any one of the above-mentioned methods, and therefore, the description thereof is omitted here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic block diagram of a detection device of a magnetic levitation motor according to an embodiment of the invention;

fig. 2 shows a schematic structural diagram of a magnetic levitation motor according to an embodiment of the present invention;

fig. 3 shows a flow diagram of a detection method of a magnetic levitation motor according to an embodiment of the invention;

fig. 4 shows a flow diagram of a detection method of a magnetic levitation motor according to an embodiment of the invention;

fig. 5 shows a flow diagram of a detection method of a magnetic levitation motor according to an embodiment of the invention;

FIG. 6 shows a flow diagram for determining a duty cycle of a sampled signal according to one embodiment of the invention;

fig. 7 shows another schematic block diagram of a detection arrangement of a magnetic levitation motor according to an embodiment of the invention;

FIG. 8 illustrates a waveform diagram of a sampled signal according to one embodiment of the invention;

FIG. 9 illustrates a waveform diagram of a sampled signal according to one embodiment of the invention;

fig. 10 shows a system block diagram of a detection device of a magnetic levitation motor according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the names of the components in fig. 2 is:

100 magnetic suspension motor detection device, 102 detection device, 1022 first eddy current sensor, 1024 second eddy current sensor, 800 magnetic suspension motor, 802 rotating shaft, 804 recess and 806 protection bearing.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Example one

In one embodiment of the present invention, as shown in fig. 1 and 2, the present invention provides a detection apparatus 100 for a magnetic levitation motor, the magnetic levitation motor including a rotating shaft, the detection apparatus 100 for a magnetic levitation motor including: at least two detecting means 102 disposed at intervals in a rotating direction of the rotating shaft for detecting the sampling signal when the rotating shaft rotates; and a control device 104 for determining the rotation direction of the rotation shaft according to the sampling signal.

The embodiment of the invention provides a detection device 100 of a magnetic suspension motor, wherein the detection device 102 can detect the rotation direction of a rotating shaft of the magnetic suspension motor, and specifically, the detection device 100 of the magnetic suspension motor comprises two or more detection devices 102 and a control device 104 for controlling the detection devices 102.

In the embodiment of the application, the detection device 102 is arranged, the rotation direction of the rotating shaft is determined by using the sampling signal detected by the detection device 102, and the problem that the rotation direction of the rotating shaft cannot be determined at the present stage, so that the magnetic suspension motor is reversed, the system fault of the magnetic suspension motor is caused, the service life of the system is influenced, and the use experience of a user is influenced is solved.

In one embodiment, the detecting device 102 can periodically detect the rotating shaft when the rotating shaft rotates to obtain a sampling signal, and send the sampling signal to the control device 104, and the control device 104 can determine the rotating direction of the rotating shaft according to the sampling signal after receiving the sampling signal.

In one embodiment, based on the rotation of the rotating shaft, the control device 104 sends a detection instruction to the detection device 102, wherein the detection device 102 periodically detects the rotating shaft after receiving the detection instruction so as to obtain a sampling signal, and determines the rotating direction of the rotating shaft according to the sampling signal.

In this embodiment, the control device 104 is specifically configured to: determining the duty ratio of the sampling signal according to the sampling signal; and determining the rotation direction of the rotating shaft according to the comparison result of the duty ratio of the sampling signal and a preset duty ratio threshold value.

In this embodiment, a method for determining a rotation direction of a rotating shaft using a duty ratio of a sampling signal is proposed, and the rotation direction of the rotating shaft is characterized using a comparison result of the duty ratio of the sampling signal and a preset duty ratio threshold value.

In one embodiment, the control device 104 is specifically configured to: determining that the duty ratio of the sampling signal is greater than a duty ratio threshold value, and rotating the rotating shaft along a first direction; and determining that the duty ratio of the sampling signal is smaller than the duty ratio threshold value, and rotating the rotating shaft in the second direction.

In this embodiment, the rotating shaft has two and only two rotating directions, namely a first rotating direction and a second rotating direction, and specifically, when the duty ratio corresponding to the determined sampling signal is greater than the duty ratio threshold value, the current rotating direction of the rotating shaft is considered to be the first direction; and when the duty ratio corresponding to the determined sampling signal is smaller than the duty ratio threshold, the current rotation direction of the rotating shaft is determined to be the second direction, in the process, the determination process of the rotation direction of the rotating shaft only needs to compare the duty ratio corresponding to the determined sampling signal with the duty ratio threshold, namely, the comparison of the numerical value, and the data processing amount is small, so that the detection device 100 of the magnetic suspension motor can adopt a chip with weak calculation force or processing capacity as the control device 104, and the manufacturing cost of the detection device 100 of the magnetic suspension motor is reduced.

Example two

In the first embodiment, as shown in fig. 1, the number of the detecting devices 102 is two, and the control device 104 is specifically configured to: determining a level signal corresponding to any sampling signal, wherein the level signals corresponding to the sampling signals detected by the two detection devices 102 are opposite; determining a first time length for converting the level signal from a low level signal to a high level signal and a second time length for converting the high level signal to the low level signal; confirming a third time length between two adjacent high-level signals and a fourth time length between two adjacent low-level signals; and taking the ratio of the first time length to the third time length as the duty ratio of the sampling signal, or taking the ratio of the second time length to the fourth time length as the duty ratio of the sampling signal.

In this embodiment, in the determination of the duty ratio of the sampling signal, it is necessary to control the rotating shaft to rotate once so as to know the time required for the rotating shaft to rotate once, since the rotation axis is detected by the detecting device 102 in the embodiment of the present application, in order to reduce the number of sampled signals that need to be processed, therefore, it is necessary to know the minimum magnitude of the sampled signals at the time of determining the duty cycle, since the number of sampled signals is related to the number of detection devices 102, the minimum number value of the detection devices 102 needs to be determined, the number of detected sampled signals is controlled by defining the number of detection means 102, and further determining the minimum components required to achieve the above-mentioned effects so as to achieve the above-mentioned functions with the minimum components, in this process, the manufacturing cost of the detecting device 100 for detecting the magnetic levitation motor is reduced by determining the number of the detecting devices 102.

Specifically, during the rotation of the rotating shaft, the operation state of the rotating shaft, i.e., the rotation direction, may be determined according to the sequence in which at least two detection devices 102 spaced apart in the rotation direction of the rotating shaft are sequentially triggered. In order to distinguish the sampling signals corresponding to the two detection devices 102, it is defined that the level signals corresponding to the sampling signals detected by the two detection devices 102 are opposite, that is, after one of the two detection devices 102 detects a certain position of the rotating shaft, the corresponding sampling signal is a high level signal or a low level signal, and after the other of the two detection devices 102 detects the same position of the rotating shaft, the corresponding sampling signal is a low level signal or a high level signal, and the sampling signals corresponding to the different detection devices 102 are distinguished in the above manner.

Based on the above, the operation state of the rotating shaft may be determined by using the sequence in which the two detection devices 102 are sequentially triggered, and detection is required at the initial stage of rotation of the rotating shaft, specifically, when the detection device 102 is used for detection, the rotating speed of the rotating shaft is very high, it is difficult to determine the sequence of the sampling signals, the requirement on the detection time is high, and it is difficult to capture the sampling signals in the actual detection process.

In order to solve the above problem, the current rotation direction is represented by the conversion state of the level signal corresponding to the sampling signal, specifically, when the rotation axis rotates for one circle, one of the two detection devices 102 first detects a certain position of the rotation axis, the other of the two detection devices 102 detects the same position of the rotation axis along with the rotation of the rotation axis, and the detection device 102 that first detects the certain position of the rotation axis along with the rotation of the rotation axis detects the position again. Since the same signal is generated when one and the same detecting means 102 detects a certain position of the axis of rotation, the same signal, therefore, two adjacent high level signals or two adjacent low level signals can be used as the time taken by the rotating shaft to rotate for one circle, so as to obtain the rotating period of the rotating shaft, since a position of the rotation axis is detected by the same detecting device 102 continuously, it is necessary to detect the position by another detecting device 102, that is, there must be a low level signal between two adjacent high level signals, or there must be a high level signal between two adjacent low level signals, and between two adjacent high level signals, the first duration of the level signal rising from the low level signal to the high level signal is only related to the positions of the two detection devices 102 spaced apart in the rotation direction of the rotation shaft.

Therefore, the interval arrangement condition of the two detection devices 102 in the rotating direction of the rotating shaft can be represented according to the first time length of the level signal rising from the low level signal to the high level signal, and then the rotating direction of the rotating shaft can be represented according to the first time length, in the process, the determining process of the rotating direction of the rotating shaft is simple, and the data processing amount is small, so that the detection device 100 of the magnetic suspension motor can adopt a chip with weak computing power or processing capability as the control device 104, and the manufacturing cost of the detection device 100 of the magnetic suspension motor is reduced.

In addition, in order to ensure the detection accuracy and reduce the deviation which may exist in the determination of the first time length, which may cause the detection result to be inaccurate, the ratio of the first time length to the third time length, that is, the duty ratio of the sampling signal, may be calculated, and the rotation direction of the rotating shaft may be determined using the ratio, in which, since time estimation is required in the determination of both the first time length and the third time length, the influence of the estimation deviation which exists in the determination of the first time length on the determination result is reduced by converting the determination of the first time length in which the level signal is increased from the low level signal to the high level signal to the determination of the ratio of the first time length to the third time length, and the reliability of the determination result is improved in this embodiment.

In one embodiment, the control device 104 is specifically configured to: outputting a high-level signal based on whether the sampling value indicated by any sampling signal is less than or equal to a first signal threshold value; and outputting a low level signal based on the sampling value indicated by any sampling signal being larger than a second signal threshold value, wherein the first signal threshold value is smaller than the second signal threshold value.

In this embodiment, in the determination process of the sampling signal, signal interference may exist in the sampling signal, and in order to reduce the influence of this part of interference on the determination process of the high-level signal and the low-level signal, the embodiment of the present application defines two parameters, namely a first signal threshold and a second signal threshold, and uses these two parameters to determine whether the sampling signal is the high-level signal or the low-level signal.

In one embodiment, in any of the above embodiments, the control device 104 is further configured to: comparing the rotation direction of the rotating shaft with the set rotation direction; outputting correct connection information based on the fact that the rotating direction of the rotating shaft is consistent with the set rotating direction; and outputting connection error information based on the fact that the rotation direction of the rotating shaft is not consistent with the set rotation direction.

In the embodiment, the rotation direction of the rotating shaft is compared with the set rotation direction, so that the connection error information is output under the condition that the comparison result is inconsistent, a user can process the connection fault in time, and the influence of the connection problem of the magnetic suspension motor on the operation reliability of a system where the magnetic suspension motor is located is reduced.

In any of the above embodiments, the rotating shaft is formed with a recess in a circumferential direction; the detection device 102 is an eddy current sensor, and generates a detection signal based on the rotation of the recess into the detection region of the eddy current sensor.

In this embodiment, the circumferential direction of the rotating shaft is concave, so that detection signals generated by detection of the eddy current sensor can be realized, and the information can be conveniently determined by a user, and a sensed part does not need to be arranged in the circumferential direction of the rotating shaft separately, so that the manufacturing cost of the detection device 100 of the magnetic suspension motor can be reduced.

EXAMPLE III

In one embodiment of the present invention, there is provided a detection method of a magnetic levitation motor, the magnetic levitation motor including a rotating shaft, as shown in fig. 3, the detection method including:

step 302, controlling a detection device to detect a sampling signal when a rotating shaft rotates;

in step 304, the rotation direction of the rotation axis is determined according to the sampling signal.

The detection devices are arranged along the rotation direction of the detected rotating shaft, specifically, the detection devices are arranged at intervals, and the number of the detection devices is more than or equal to two.

The embodiment of the invention provides a detection method of a magnetic suspension motor, which can detect the rotation direction of a rotating shaft of the magnetic suspension motor, and particularly, the rotation direction of the rotating shaft is determined by using a sampling signal detected by a detection device, so that the problems that the rotation direction of the rotating shaft cannot be determined in the current stage, the magnetic suspension motor is reversed, the system where the magnetic suspension motor is located is in failure, the service life of the system is influenced, and the use experience of a user is influenced are solved.

In one embodiment, the detection device can periodically detect the rotating shaft when the rotating shaft rotates to obtain a sampling signal, and feed back the sampling signal to send, and after receiving the sampling signal, the rotation direction of the rotating shaft can be determined according to the sampling signal.

In one embodiment, a detection instruction is sent to the detection device based on the rotation of the rotating shaft, wherein the detection device periodically detects the rotating shaft after receiving the detection instruction so as to obtain a sampling signal, and determines the rotating direction of the rotating shaft according to the sampling signal.

Example four

In an embodiment of the present invention, there is provided a detection method of a magnetic levitation motor, as shown in fig. 4, the detection method including:

step 402, controlling a detection device to detect a sampling signal when a rotating shaft rotates;

step 404, determining the duty ratio of the sampling signal;

and step 406, comparing the duty ratio of the sampling signal with a duty ratio threshold value, and determining the rotation direction of the rotating shaft according to the comparison result.

In this embodiment, when the duty ratio of the sampling signal exceeds the duty ratio threshold, the rotation direction of the rotary shaft is the first direction; when the duty ratio of the sampling signal is lower than the duty ratio threshold value, the rotating direction of the rotating shaft is the second direction.

In this embodiment, the rotating shaft has two and only two rotating directions, namely a first rotating direction and a second rotating direction, and specifically, when the duty ratio corresponding to the determined sampling signal is greater than the duty ratio threshold value, the current rotating direction of the rotating shaft is considered to be the first direction; and when the duty ratio corresponding to the determined sampling signal is smaller than the duty ratio threshold, the current rotation direction of the rotating shaft is determined to be the second direction, in the process, the determination process of the rotation direction of the rotating shaft only needs to compare the duty ratio corresponding to the determined sampling signal with the duty ratio threshold, namely, the comparison of the numerical value is carried out, and the data processing amount is small.

EXAMPLE five

In an embodiment of the present invention, there is provided a detection method of a magnetic levitation motor, as shown in fig. 5, the detection method including:

step 502, controlling a detection device to detect a sampling signal when a rotating shaft rotates;

step 504, determining the duty ratio of the sampling signal;

step 506, comparing the duty ratio of the sampling signal with a duty ratio threshold value, and determining the rotation direction of the rotating shaft according to the comparison result;

in step 508, when the rotation direction of the rotation shaft does not match the set rotation direction, a connection error message is output.

The detection devices are arranged along the rotation direction of the detected rotating shaft, specifically, the detection devices are arranged at intervals, the number of the detection devices is larger than or equal to two, and correct connection information is output or information is not output based on the fact that the rotation direction of the rotating shaft is consistent with the set rotation direction.

Wherein the duty cycle threshold value is 0.5.

EXAMPLE six

In any of the above embodiments, the number of the detecting devices is two, as shown in fig. 6, and the step of determining the duty ratio of the sampling signal includes:

step 602, determining a level signal corresponding to an optional sampling signal;

step 604, recording a first duration of time for which the level signal is switched from the low level signal to the high level signal and a second duration of time for which the level signal is switched from the high level signal to the low level signal;

step 606, recording a third duration when the high level signal is experienced again after the high level signal is recorded, and a fourth duration when the low level signal is experienced again after the low level signal is recorded;

step 608, calculate the ratio of the first duration to the third duration, or calculate the ratio of the second duration to the fourth duration.

In this embodiment, the above ratio is taken as the duty ratio of the sampling signal, wherein when the level signal corresponding to the sampling signal detected by one of the two detection means is a low level signal, the level signal corresponding to the sampling signal detected by the other of the two detection means is a high level signal.

In this embodiment, in the determination of the duty ratio of the sampling signal, it is necessary to control the rotating shaft to rotate once so as to know the time required for the rotating shaft to rotate once, since the rotation shaft is detected by the detection means in the embodiment of the present application, therefore, in order to reduce the number of sampled signals that need to be processed, it is necessary to know the minimum magnitude of the sampled signals in determining the duty cycle, since the number of sampling signals is related to the number of detection means, it is necessary to determine the minimum number value of the detection means, control the number of detected sampling signals by defining the number of detection means, and further determining the minimum components required to achieve the above-mentioned effects so as to achieve the above-mentioned functions with the minimum components, in this process, the manufacturing cost of the detection device for detecting the magnetic levitation motor is reduced by determining the number of the detection devices.

In one embodiment, the step of determining the level signal corresponding to any one of the sampling signals specifically includes: when the sampling value indicated by the optional sampling signal does not exceed the first signal threshold value, the sampling value indicated by the optional sampling signal is a high-level signal; the sample value indicated by the optional sample signal is a low level signal based on the sample value indicated by the optional sample signal exceeding a second signal threshold, wherein the first signal threshold is less than the second signal threshold.

EXAMPLE seven

In one embodiment of the present invention, as shown in fig. 7, there is provided a detection apparatus 100 for a magnetic levitation motor, including: a memory 702, the memory 702 having a computer program stored thereon; a controller 704, the controller 704 executing a computer program to implement the steps of the method of detecting a magnetic levitation motor as described in any one of the above.

An embodiment of the present invention provides a detection apparatus 100 for a magnetic levitation motor, wherein the detection apparatus 100 for a magnetic levitation motor includes a memory 702 and a controller 704, and the controller 704 executes a computer program to implement the steps of any one of the above detection methods for a magnetic levitation motor.

For example, in the process of determining the duty ratio of the sampling signal, the rotating shaft needs to be controlled to rotate for one circle so as to know the time required by the rotating shaft to rotate for one circle, since the rotation axis is detected by the detecting device 102 in the embodiment of the present application, in order to reduce the number of sampled signals that need to be processed, therefore, it is necessary to know the minimum magnitude of the sampled signals at the time of determining the duty cycle, since the number of sampled signals is related to the number of detection devices 102, the minimum number value of the detection devices 102 needs to be determined, the number of detected sampled signals is controlled by defining the number of detection means 102, and further determining the minimum components required to achieve the above-mentioned effects so as to achieve the above-mentioned functions with the minimum components, in this process, the manufacturing cost of the detecting device 100 for detecting the magnetic levitation motor is reduced by determining the number of the detecting devices 102.

Therefore, the interval arrangement of the two detection devices 102 in the rotation direction of the rotating shaft can be represented according to the first time length of the level signal rising from the low level signal to the high level signal, and then the rotation direction of the rotating shaft can be represented according to the first time length, in the process, the determination process of the rotation direction of the rotating shaft is simple, and the data processing amount is small, so that the detection device 102 can adopt a chip with weak computing power or processing capability as the control device 104, and the manufacturing cost of the detection device 102 is reduced.

Example eight

In one embodiment of the present invention, as shown in fig. 2, there is provided a magnetic levitation motor 800 comprising: a rotating shaft 802, a recess 804 being formed in a circumferential direction of the rotating shaft 802; the detecting device 100 for a magnetic levitation motor as described above.

An embodiment of the present invention provides a magnetic suspension motor 800, wherein the magnetic suspension motor 800 includes a rotating shaft 802 and a detection apparatus 100 of the magnetic suspension motor, and the detection apparatus 100 of the magnetic suspension motor has all the beneficial technical effects of the steps of the detection method of the magnetic suspension motor described above, and therefore, the magnetic suspension motor 800 has all the beneficial technical effects of the detection method of the magnetic suspension motor described above, and details are not repeated herein.

Specifically, the detecting device 102 of the detecting device 100 for a magnetic levitation motor is an eddy current sensor, wherein the number of the eddy current sensors is two, the two eddy current sensors generate signals with the same amplitude and opposite directions, and the two eddy current sensors are arranged at an angle of less than 180 degrees

Wherein the rotating shaft 802 is a permanent magnet, as shown in fig. 2, and is located inside the protective bearing 806 for rotation, and a recess is formed on the rotating shaft 802. When the recess 804 is positioned past the first eddy current sensor 1022, a signal is generated at the first eddy current sensor 1022. A signal is also generated when the recess 804 passes the second eddy current sensor 1024. The signals are stationary corresponding to locations other than the first and second

eddy current sensors

1022, 1024.

As shown in fig. 10, signals generated after the recess 804 passes through the positions of the first eddy current sensor 1022 and the second eddy current sensor 1024 pass through the sampling module 902 to obtain a preliminary sampling signal, a signal to be compared is obtained through the first signal processing module 904, a square wave signal is generated through the second signal processing module 906, the square wave signal is detected and analyzed, and the rotation speed and the duty ratio of the rotating shaft 802 can be obtained. The rotation direction of the rotating shaft 802 may also be obtained by comparing the detected duty ratio with a preset duty ratio.

Specifically, two thresholds VL and VH are set, wherein VL corresponds to a first signal threshold, VH corresponds to a second signal threshold, and if the sampled signal is lower than VL, the level is increased from the low level to the high level after passing through the first signal processing module 904 and the second signal processing module 906; if the sampling signal is higher than VL and lower than VH, the level state is not changed after passing through the signal processing module. If the sampling signal is higher than VH, the signal level is changed from high level to low level.

When the rotating shaft 802 rotates, the recess 804 passes through the first eddy current sensor 1022, and a signal Vs1 is generated, the signal Vs1 obtained by the first sensor is set to be lower than VL, and the signal passing through the first signal processing module 904 and the second signal processing module 906 and then sent to the control module 908 is inverted from low level to high level. The rotating shaft 802 then continues to rotate, which in turn generates a signal Vs2 when passing a second eddy current sensor 1024. The signal obtained by sensor s2 is set to be higher than VH, and the signal passed through signal processing module one 904 and signal processing module two 906 to control module 908 is inverted from high to low. The rotating shaft 802 continues to rotate and again reaches the first sensor s1, generating a rising edge signal that flips from low to high. This completes one revolution period. By recording the period time t, the frequency at which the rotary shaft 802 rotates can be known.

Signals generated by the first eddy current sensor 1022 and the second eddy current sensor 1024 are processed by the sampling device, the first signal processing module 904 and the second signal processing module 906 to obtain waveforms required by the control module 908. The signal 1 obtained by the first signal processing module 904 and the waveform obtained by the second signal processing module 906 are sent to the control module 908, and the control module 908 can acquire the rotating speed and the duty ratio of the rotating shaft 802. The direction of rotation of the rotating shaft 802 can be obtained by comparing the duty ratio with a preset duty ratio value.

The first eddy current sensor 1022 and the second eddy current sensor 1024 are designed at different positions, so that different duty ratios can be obtained. If the first and second

eddy current sensors

1022, 1024 are positioned 180 ° apart, a 50% duty cycle is obtained regardless of whether the rotating shaft 802 is rotated clockwise or counterclockwise.

Based on fig. 2, when the first eddy current sensor 1022 and the second eddy current sensor 1024 are placed at positions different by 90 °, as shown in fig. 8, when the rotating shaft 802 rotates clockwise, first sinks past the first eddy current sensor 1022 at time t1, a first sampling signal (signal 1) is generated, which is lower than the threshold VL, and the output level is changed from low level to high level (signal 2); when the recess 804 reaches the position shown in fig. 2 at a time t2, the signal voltage of the signal obtained by the second eddy current sensor 1024 exceeds the set threshold VH after passing through the sampling module 902 and the first signal processing module 904, and the level of the signal passing through the second signal processing module 906 is inverted from the high level to the low level. The rotating shaft 802 continues to rotate, and the recess reaches the position shown in fig. 2, the operation of one rotation is completed, the signal at the time t3 is also obtained, and the signal level is inverted from the low level to the high level again; completing one cycle Δ t₁₃When the rotation is performed again, a signal at time t4 is obtained. time t from t1 to t2 is Δ t₁₂The waveform generated at this time is shown in FIG. 8, and the duty thereofRatio D₁₂The following formula:

D₁₂＝Δt₁₂/Δt₁₃＝0.25；

when the rotating shaft 802 rotates counterclockwise, the recess 804 reaches the position shown in fig. 2, at this time, the sampled signal (signal 1) is higher than the threshold VH, the level is inverted from high level to low level (signal 2), the time at this time is recorded as t1, the rotating shaft 802 continues to rotate counterclockwise by 90 ° at a constant speed to the position shown in fig. 2, the sampled signal is lower than the threshold VL, at this time, after passing through the sampling module 902, the signal processing module one 904, and the signal processing module two 906, the signal level is inverted from low level to high level, and the time at this time is t 2. The rotating shaft 802 continues to rotate counterclockwise at a constant speed, again passing through the position of fig. 2, and the signal level to the control module 908 again flips from high to low. The signal waveform is shown in fig. 9.Δ t₂₃The period control module 908 receives a high level, Δ t₁₃Is the time of one revolution. When the rotation is performed again, a signal at time t4 is obtained. Duty cycle D thereof₂₃The following formula:

D₂₃＝Δt₂₃/Δt₁₃＝0.75；

when the rotation shaft 802 rotates clockwise, D₁₂Less than 0.5, D when the rotating shaft 802 rotates counterclockwise₂₃If the value is greater than 0.5, and 0.5 is taken as a threshold value, it can be determined whether the rotation shaft 802 rotates clockwise or counterclockwise.

The direction of rotation of the rotating shaft 802 is obtained, and the rotating shaft 802 can be actively adjusted to rotate in the correct direction of rotation, or the operator can be instructed to stop the machine to correct the direction.

In the above example, for convenience of description, the first eddy current sensor 1022 and the second eddy current sensor 1024 are disposed at positions different by 90 °, which leads to the above conclusion.

Results of more than 0.5 and less than 0.5 can be obtained as long as the sensors are not placed at positions differing by 180 °, and the direction of the shaft rotation can also be determined.

Example nine

In an embodiment of the invention, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the method of detection of a magnetic levitation motor as defined in any one of the above.

An embodiment of the present invention provides a storage medium, where the medium can be identified and read by a computer, and where a computer program stored in the storage medium has all the beneficial technical effects of any one of the above-mentioned methods when executed, and details are not repeated herein.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection device of a magnetic suspension motor, which is characterized in that the magnetic suspension motor comprises a rotating shaft, and the detection device of the magnetic suspension motor comprises:

at least two detection devices arranged at intervals along the rotation direction of the rotating shaft and used for detecting sampling signals when the rotating shaft rotates;

and the control device is used for determining the rotating direction of the rotating shaft according to the sampling signal.

2. The detection device of a magnetic levitation motor as recited in claim 1, wherein the control device is specifically configured to:

determining the duty ratio of the sampling signal according to the sampling signal;

and determining the rotation direction of the rotating shaft according to the comparison result of the duty ratio of the sampling signal and a preset duty ratio threshold value.

3. The detection device of a magnetic levitation motor as recited in claim 2, wherein the control device is specifically configured to:

determining that the duty cycle of the sampling signal is greater than the duty cycle threshold, and rotating the rotating shaft in a first direction;

and determining that the duty ratio of the sampling signal is smaller than the duty ratio threshold value, and rotating the rotating shaft in a second direction.

4. The detection device of a magnetic levitation motor as recited in claim 2, wherein the number of the detection devices is two, and the control device is specifically configured to:

determining a level signal corresponding to any one of the sampling signals, wherein the level signals corresponding to the sampling signals detected by the two detection devices are opposite;

determining a first time length for converting the level signal from a low level signal to a high level signal and a second time length for converting the high level signal to the low level signal;

confirming a third time length between two adjacent high-level signals and a fourth time length between two adjacent low-level signals;

and taking the ratio of the first time length to the third time length as the duty ratio of the sampling signal, or taking the ratio of the second time length to the fourth time length as the duty ratio of the sampling signal.

5. The detection device of a magnetic levitation motor as recited in claim 4, wherein the control device is specifically configured to:

outputting the high level signal based on a sampling value indicated by any one of the sampling signals being less than or equal to a first signal threshold;

outputting the low level signal based on a sample value indicated by any of the sample signals being greater than a second signal threshold,

wherein the first signal threshold is less than the second signal threshold.

6. Detection device of a magnetic levitation motor according to any of claims 1-5, characterised in that the control device is further adapted to:

comparing the rotation direction of the rotating shaft with a set rotation direction;

outputting correct connection information based on the fact that the rotating direction of the rotating shaft is consistent with the set rotating direction;

and outputting connection error information based on the fact that the rotation direction of the rotating shaft is not consistent with the set rotation direction.

7. Detection apparatus of a magnetic levitation motor as claimed in claim 6,

a recess is formed in the circumferential direction of the rotating shaft;

the detection device is an eddy current sensor, and generates the detection signal based on the fact that the recess rotates into the detection area of the eddy current sensor.

8. A detection method of a magnetic levitation motor, wherein the magnetic levitation motor includes a rotating shaft, the detection method comprising:

controlling at least two detection devices arranged at intervals along the rotation direction of the rotating shaft to detect sampling signals when the rotating shaft rotates;

and determining the rotation direction of the rotating shaft according to the sampling signal.

9. The method for detecting a magnetic levitation motor as claimed in claim 8, wherein the step of determining the rotation direction of the rotating shaft according to the sampling signal comprises:

10. The method for detecting a magnetic levitation motor as claimed in claim 9, wherein the step of determining the rotation direction of the rotating shaft according to the comparison result of the duty ratio of the sampling signal and a preset duty ratio threshold specifically comprises:

determining that the duty cycle of the sampled signal is greater than the duty cycle threshold, the rotating shaft rotating in a first direction;

determining that the duty cycle of the sampled signal is less than the duty cycle threshold, the rotating shaft rotating in a second direction.

11. The method for detecting a magnetic levitation motor as claimed in claim 9, wherein the number of the detection devices is two, and the step of determining the duty cycle of the sampling signal according to the sampling signal specifically comprises:

12. The method for detecting a magnetic levitation motor as claimed in claim 11, wherein the step of determining the level signal corresponding to any one of the sampling signals specifically comprises:

wherein the first signal threshold is less than the second signal threshold.

13. The detection method of a magnetic levitation motor as recited in any one of claims 8 to 12, further comprising:

14. A detection device of a magnetic suspension motor is characterized by comprising:

a memory having a computer program stored thereon;

a controller executing the computer program to carry out the steps of the method of detection of a magnetic levitation motor as claimed in any one of claims 8 to 13.

15. A magnetically levitated motor, comprising:

a rotating shaft having a recess formed in a circumferential direction thereof;

detection apparatus for a magnetic levitation motor as claimed in any one of claims 1 to 7.

16. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of detection of a magnetic levitation motor as claimed in any one of claims 8 to 13.