CN111102913A - Online detection system for motor stator and rotor spacing change - Google Patents
Online detection system for motor stator and rotor spacing change Download PDFInfo
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- CN111102913A CN111102913A CN201811268336.0A CN201811268336A CN111102913A CN 111102913 A CN111102913 A CN 111102913A CN 201811268336 A CN201811268336 A CN 201811268336A CN 111102913 A CN111102913 A CN 111102913A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
Abstract
The embodiment of the application provides an online detection system for the change of the distance between a stator and a rotor of a motor, which comprises a processor and a plurality of sensors; the sensitive electrodes of the sensors are respectively arranged at a plurality of different positions on the inner wall of the stator, the sensitive electrodes of the sensors are over against the rotor, and the physical parameters of the sensors change along with the change of the distance from the sensitive electrodes of the sensors to the rotor; a plurality of said sensors are connected to said processor, said processor being configured to execute an application stored therein to perform the steps of: acquiring signal values output by the sensors; calculating a ratio between any two of the plurality of signal values; and detecting the change of the distance between the rotor and the stator according to the ratio. The distance between the rotor and the stator is detected through the continuous change and the sudden change of the ratio of the output signals of the sensors, so that the error caused by the drift of the sensors is eliminated, and the reliability of the system is improved.
Description
Technical Field
The application relates to the technical field of motor equipment detection, in particular to an online detection system for motor stator and rotor distance change.
Background
When the motor runs, the motor is impacted and distorted by various natural factors, so that the stator and the rotor of the motor generate larger vibration, when the motor is serious, the rotor and the stator can rub, the service life of the motor is shortened if the rotor and the stator are serious, equipment is damaged if the rotor and the stator are serious, and even accidents are caused.
At present, the gap variation between the stator and the rotor of the motor can be detected by an eddy current sensor. The principle of the eddy current sensor is to accurately measure the relative position of a detected body (which must be a metal conductor) and a probe end face through the eddy current effect. When the chemical and physical characteristics of the end face of the sensor probe are consistent, the electric eddy current is related to the distance of the metal part when the metal material is detected by using the electric eddy current sensor. However, the probe end surface of the sensor may have an unevenly distributed oxide layer or be attached with contaminants, and in this case, even if the distance between the sensor and the surface of the detected component is not changed, the eddy current may be changed due to the inconsistency of the surface material of the rotor.
Therefore, when the single sensor is adopted to detect the distance between the stator and the rotor of the motor, the detection result of the sensor is inconsistent with the actual result due to the oxidation of the surface of the sensor, the reliability of a detection system is reduced, and the maintenance cost is increased invisibly.
Disclosure of Invention
The application provides an online detection system for motor stator and rotor spacing change, which can solve the problem of low reliability of the existing detection mode. The technical scheme adopted by the application is as follows:
the application provides an online detection system that motor stator and rotor interval change includes: the method comprises the following steps: a processor and a plurality of sensors;
the sensitive electrodes of the sensors are respectively arranged at a plurality of different positions on the inner wall of the stator, the sensitive electrodes of the sensors are over against the rotor, and the physical parameters of the sensors change along with the change of the distance from the sensitive electrodes of the sensors to the rotor;
each sensor is connected with the processor;
the processor is used for executing the application program stored in the processor so as to realize the following steps:
acquiring signal values output by the sensors;
calculating a ratio between any two of the plurality of signal values;
and detecting the change of the distance between the rotor and the stator according to the ratio.
Optionally, the arrangement positions of the sensitive electrodes of a plurality of the sensors form a circumference, and the sensitive electrodes of a plurality of the sensors are uniformly distributed on the circumference.
Optionally, when the number of sensors included in the system is an even number, the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
and detecting the change of the distance between the rotor and the stator according to the ratio of the signal values output by the two sensors which are opposite to each other on the circumference.
Optionally, when the number of sensors included in the system is an odd number, the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
and detecting the change of the distance between the rotor and the stator according to the ratio of the signal values output by the two sensors with the largest angle difference on the circumference.
Optionally, before detecting the change in the distance between the rotor and the stator according to the ratio, the method further includes the following steps:
detecting a fault sensor by comparing a plurality of ratios, and filtering out the ratio obtained by calculating the signal value output by the fault sensor;
the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
detecting a change in a spacing between the rotor and the stator based on the filtered ratio.
Optionally, before detecting the change in the distance between the rotor and the stator according to the ratio, the method further includes the following steps:
determining the weight corresponding to the ratio according to the angle of the interval between the two sensors corresponding to the ratio;
the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
and detecting the change of the distance between the rotor and the stator according to the ratios and the weights corresponding to the ratios.
Optionally, the processor is configured to perform the following steps:
calculating a rate of change of a plurality of said signal values;
the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
detecting a change in a spacing between the rotor and the stator based on the rate of change and the ratio.
Optionally, the sensor is a capacitive sensor, a planar inductive sensor or a magnetic sensor, the two electrodes of the capacitive sensor being in one plane.
Compared with the prior art, the online detection system for the change of the distance between the stator and the rotor of the motor provided by the embodiment of the application has the following beneficial effects:
(1) because the distance between the rotor and the stator is detected through the continuous change and the sudden change of the ratio of the output signals of the sensors, the error caused by the drift of the sensors is basically eliminated, and even if different sensor electrodes are unevenly attached by pollutants, the error caused by the different sensor electrodes can be eliminated, thereby improving the reliability of the system;
(2) the fault sensor with oxidation or pollution of the sensitive electrode can be detected by comparing the ratio of the output signals of the plurality of groups of sensors, the data measured by the fault sensor is filtered during data processing, and the error brought by the fault sensor is eliminated by an algorithm, so that the times and the cost for maintaining the sensor are reduced;
(3) the sensor is exposed on the inner side of the stator and is only a sensitive electrode, so that the sensor can well bear strong vibration caused by high-speed rotation of the motor, and the anti-vibration and anti-impact capacity of the sensor is strong.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.
FIG. 1 is a schematic structural diagram of an on-line detection system for detecting a change in a gap between a stator and a rotor of a motor according to an embodiment of the present disclosure;
FIG. 2a is a schematic view of the position of the rotor at a point in the normal rotation of the rotor;
FIG. 2b isT during the process of rotor generating larger vibration1A schematic view of the rotor position at time;
FIG. 2c shows t during a large vibration of the rotor2A schematic view of the rotor position at time;
fig. 3 is a schematic diagram showing the positions of the respective sensors when 8 sensors are arranged.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present application provides an online detection system for a gap variation between a stator and a rotor of an electric machine, including: a processor 20 and a plurality of sensors 10, each of the plurality of sensors 10 being connected to the processor 20.
As shown in FIG. 1, the sensing electrodes of the sensors 10 in the system are respectively arranged at a plurality of different positions on the inner wall of the stator 30, the sensing electrodes of the sensors 10 are opposite to the rotor 40, so that the sensors 10 can correctly measure the distance between the stator 30 and the rotor 40, the physical parameters of the sensors 10 are changed along with the change of the distance from the sensing electrodes of the sensors 10 to the rotor, the change of the physical parameters of the sensors 10 causes the signal value (voltage value or current value) output by the sensors 10 to be changed, and therefore, the signal value output by the sensors 10 is related to the distance value from the sensors 10 to the rotor 40.
The sensor may be a capacitive sensor, a planar inductive sensor, a magnetic sensor, or the like, and the two electrodes of the capacitive sensor used herein are in one plane. The sensitive electrode of the sensor is opposite to the rotor, which means that the detecting end face (i.e. the electrode) of the sensor needs to be opposite to the rotor.
When the rotor normally rotates, the distance between the rotor and the stator should be kept constant or change very little, and therefore, the capacitance value of the capacitive sensor is substantially constant. And when the rotor takes place great vibration relatively the stator, the interval between rotor and the stator can take place great change, leads to capacitance sensor's capacitance value to take place great fluctuation, consequently, through the capacitance value that detects capacitance sensor, just can detect the rotor of motor and whether take place vibration and the range of vibration at the rotation in-process.
When the rotor is normally rotated, the spacing between the rotor and the stator should be constant or vary very little, and therefore, the inductance value of the planar inductance sensor is substantially constant. When the rotor vibrates greatly relative to the stator, the distance between the rotor and the stator changes greatly, so that the inductance value of the planar inductance sensor fluctuates greatly, and therefore, whether the rotor of the motor vibrates and the amplitude of the vibration in the rotating process can be detected by detecting the inductance value of the planar inductance sensor.
The magnetic sensor detects a change in the gap between the rotor and the stator by sensing the intensity of the magnetic field. When the rotor vibrates greatly relative to the stator, the distance between the rotor and the stator changes greatly, which causes the magnetic field value (such as magnetic flux) around the magnetic field sensor to change, therefore, the change of the magnetic field can be detected by detecting the magnetic sensor, and the change of the distance between the rotor and the stator can be detected. The magnetic sensor may be a magnetic sensor made using a Hall (Hall) element, an Anisotropic Magnetoresistive (AMR) element, or a Giant Magnetoresistive (GMR) element as a sensing element.
No matter which kind of sensor is adopted, the sensor is exposed on the inner side of the stator and is only used for detecting an end face, namely an electrode, so that the sensor can well bear strong vibration caused by high-speed rotation of the motor, and the anti-vibration and anti-impact capacity of the sensor is strong.
It should be noted that the monitoring frequency of the operation of the various sensors should be 4-10 times higher than the frequency of the motor rotation speed.
The processor obtains the signal value output by each sensor, and the signal value output by the sensor can be a voltage value or a current value. The processor integrates signal values output by the sensors to detect the change of the distance between the rotor and the stator, and executes an application program stored in the processor to realize the following steps:
s101, acquiring signal values output by each sensor;
s102, calculating a ratio of any two signal values in the acquired multiple signal values;
and S103, detecting the change of the distance between the rotor and the stator according to the ratio.
In particular, the variation of the spacing between the rotor and the stator can be detected according to the continuous variation and the sudden variation of the ratio. If the ratio is kept stable, the stable interval between the rotor and the stator is indicated, and the motor works normally. When the ratio suddenly changes, the rotor generates vibration deviating from the axis, the larger the amplitude of the ratio sudden change is, the larger the vibration is, the longer the sudden change duration is, the higher the possibility of potential failure caused by the rotor vibration is, and the closer the rotor vibration is to the failure occurrence time.
When the ratio between the two signal values is calculated, it is required to ensure that the acquisition moments of the two signal values are the same. Because the signal values output by the sensors are continuous, the corresponding specific values at all moments in the running process of the motor can be continuously obtained, and the online detection of the motor is realized.
When only one sensor is used for detection, the signal value output by the single sensor is influenced by the environment, and an error easily exists.
When two sensors are used for detection, because the two sensors are in the same environment, the drift of the sensor output value caused by the environmental factors should be consistent, so by calculating the ratio of the two sensor output signal values, the error caused by the environmental factors and the sensor drift can be eliminated. Referring to fig. 2a, when the rotor 40 rotates normally, the distance between the rotor 40 and the stator 30 should be kept constant or change very little, so that, at the same time, the distance between the rotor 40 and the sensor 1 and the sensor 5 is equal or close, the ratio of the output signals of the sensor 1 and the sensor 5 is close to 1, and the ratio is stable. When the rotor 40 vibrates relatively greatly with respect to the stator 30, the distance between the rotor 40 and the stator 30 changes greatly, and fig. 2b shows t during the process of relatively large vibration of the rotor 401In the schematic diagram of the position of the rotor 40 at the moment, the rotor 40 is closer to the sensor 1 and farther from the sensor 5, so the ratio of the output signals of the sensor 1 and the sensor 5 deviates from 1, and the larger the rotor vibration is, the more the ratio deviates from 1, fig. 2c shows that t is the larger vibration of the rotor during the process of generating the larger vibration2The schematic diagram of the position of the rotor at the moment is that the rotor is far from the sensor 1 and near to the sensor 5, so that the ratio of the output signals of the sensor 1 and the sensor 5 also fluctuates periodically along with the rotation of the rotor 40, and the larger the rotor 40 vibrates, the larger the fluctuation amplitude of the ratio is.
Certainly, during practical application, more than two sensors can be arranged in the stator, the ratio of output signals of any two sensors is calculated, a plurality of groups of ratios are obtained, the plurality of groups of ratios are synthesized to detect the change of the distance between the stator and the rotor, and the measurement error is further reduced. For example, if 3 sensors are used, in combination, 3 sets of ratios can be obtained.
It will be readily appreciated that, in the same case, the closer the two sensors are, the closer the ratio of their output signals is to 1, and the further the two sensors are, the further the ratio of their output signals deviates from 1. Therefore, the output signals of two sensors that are far apart are selected to calculate the ratio, and it is not necessary to calculate the ratio between the output signals of all the sensors.
In order to reduce the difference degree of the detection points corresponding to the sensors, when the sensors are arranged, the arrangement positions of the sensors on the inner wall of the stator should form a circle, and the sensors are uniformly distributed on the circle. As shown in fig. 3, when 8 sensors are arranged, one sensor is disposed at an interval of 45 °.
When the number of the sensors included in the system is even and all the sensors are uniformly distributed on the circumference, the two sensors which are opposite to each other on the circumference are farthest away, and the signal values output by the two opposite sensors are compared and calculated, at this time, the processor is used for executing the following steps: the method comprises the steps of obtaining signal values output by a plurality of sensors, calculating the ratio between any two of the obtained signal values, and detecting the change of the distance between the rotor and the stator according to the ratio between the signal values output by two sensors which are opposite to each other on the circumference. Here, the processor may calculate only the ratio between the signal values output from two circumferentially opposed sensors.
For example, as shown in fig. 3, when there are 8 sensors, the processor obtains signal values output by the 8 sensors, calculates a first ratio according to the signal values of the sensor 1 and the sensor 5, calculates a second ratio according to the signal values of the sensor 2 and the sensor 6, calculates a third ratio according to the signal values of the sensor 3 and the sensor 7, calculates a fourth ratio according to the signal values of the sensor 4 and the sensor 8, and determines a change in a distance between the rotor and the stator by comprehensively analyzing the first ratio, the second ratio, the third ratio, and the fourth ratio, for example, may be an average value of four ratios, where the average value is closer to 1, the smaller the change in the distance between the stator and the stator is, the more stable the rotor is, and the more principle 1 the average value is, the larger the change in the distance between the stator and the rotor is, and the more severe the rotor is vibrated. And the influence of environmental factors on the detection result is further reduced by the ratio among the multiple groups of sensors.
When the number of sensors included in the system is odd and all the sensors are evenly distributed on the circumference, the processor is configured to perform the following steps: the method comprises the steps of obtaining signal values output by a plurality of sensors, calculating the ratio between any two of the obtained signal values, and detecting the change of the distance between a rotor and a stator according to the ratio between the signal values output by the two sensors with the largest angle difference on the circumference. Here, the processor may calculate only the ratio between the signal values output from the two sensors whose angles on the circumference differ most from each other.
During data processing, the processor is further configured to perform the steps of: a fault sensor is detected by comparing a plurality of ratios, and the ratio obtained by calculating the signal value output by the fault sensor is filtered. Then, the processor detects the change of the distance between the rotor and the stator according to the filtered ratio, so that the interference caused by the fault sensor is eliminated.
Factors causing the malfunction of the sensor may be oxidation of the sensitive electrode of the sensor, or adhesion of the sensitive electrode by contaminants, or malfunction of the sensor circuit, etc. By the method, even if the sensor fails, the interference caused by the failed sensor can be eliminated by an algorithm in the processor.
In the specific implementation process, when foreign matters fall on the surface of one sensor, the ratio calculated by the output signal of the sensor is subjected to sudden change, so that the interference caused by the situation can be eliminated by integrating the ratios among multiple groups of sensors. As shown in fig. 3, normally, if the ratio of the sensor 1 to the sensor 5 changes abruptly, the ratio of the sensor 1 to the sensor 4 and the ratio of the sensor 1 to the sensor 6 also change greatly; however, if the ratio of sensor 1 to sensor 4, sensor 1 to sensor 6 is unchanged and only the ratio of sensor 1 to sensor 5 changes abruptly, it indicates that the electrode surface of sensor 5 is contaminated greatly and the ratio associated with sensor 5 is filtered out in the data processing.
Therefore, the fault sensor with the oxidation or pollution of the sensitive electrode can be detected by comparing the ratio of the output signals of the plurality of groups of sensors, the data measured by the fault sensor is filtered out during data processing, and the error brought by the fault sensor is eliminated by an algorithm, so that the times and the cost for maintaining the sensor are reduced.
It is easy to understand that, in the same case, the smaller the separation angle between the two sensors is, the closer the ratio of the output signals is to 1, i.e. the ratio is less sensitive to rotor vibration; the larger the separation angle between the two sensors, the more the ratio of the output signals deviates from 1, i.e. the ratio is more sensitive to rotor vibrations. Therefore, when the rotor vibrates, the closer the angle between the two sensors is to 180 degrees, the larger the deviation of the calculated ratio from 1, and the higher the sensitivity of the ratio to the rotor vibration. The higher the sensitivity the higher the ratio should get the greater weight during data processing.
To this end, the processor is further configured to perform the following steps in the data processing: and determining the weight corresponding to the ratio according to the angle of the interval between the two sensors corresponding to the ratio. Then, the processor detects a change in the spacing between the rotor and the stator based on the plurality of ratios and the weights corresponding to the ratios.
Taking the arrangement shown in fig. 3 as an example, the separation angle between the sensor 1 and the sensor 5 is 180 degrees, the separation angle is the largest, and the weight should be the largest; sensor 1 and sensor 2 are separated by an angle of 45 degrees, the separation angle is the smallest, and the weight should be the smallest. According to the sensitivity of the ratio, different weights are given to different ratios, and the precision of the detection result can be improved.
In addition, the signal values output by the sensors also have a certain reference meaning, so that the processor is further used for executing the following steps when processing the signal values: the rate of change in the signal value output by each sensor is calculated. Then, the processor comprehensively analyzes the distance change between the rotor and the stator according to the change rate of the signal values of the sensors and the ratio of the sensors.
Compared with the prior art, the online detection system for the motor stator and rotor distance change has at least the following advantages:
(1) because the distance between the rotor and the stator is detected through the continuous change and the sudden change of the ratio of the output signals of the sensors, the error caused by the drift of the sensors is basically eliminated, and even if different sensor electrodes are unevenly attached by pollutants, the error caused by the different sensor electrodes can be eliminated, thereby improving the reliability of the system;
(2) the fault sensor with oxidation or pollution of the sensitive electrode can be detected by comparing the ratio of the output signals of the plurality of groups of sensors, the data measured by the fault sensor is filtered during data processing, and the error brought by the fault sensor is eliminated by an algorithm, so that the times and the cost for maintaining the sensor are reduced;
(3) the sensor is exposed on the inner side of the stator and is only a sensitive electrode, so that the sensor can well bear strong vibration caused by high-speed rotation of the motor, and the anti-vibration and anti-impact capacity of the sensor is strong.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (8)
1. An on-line detection system for motor stator and rotor spacing variation, comprising: a processor and a plurality of sensors;
the sensitive electrodes of the sensors are respectively arranged at a plurality of different positions on the inner wall of the stator, the sensitive electrodes of the sensors are over against the rotor, and the physical parameters of the sensors change along with the change of the distance from the sensitive electrodes of the sensors to the rotor;
each sensor is connected with the processor;
the processor is used for executing the application program stored in the processor so as to realize the following steps:
acquiring signal values output by the sensors;
calculating a ratio between any two of the plurality of signal values;
and detecting the change of the distance between the rotor and the stator according to the ratio.
2. The system of claim 1, wherein the arrangement positions of the sensitive electrodes of a plurality of the sensors form a circumference, and the sensitive electrodes of a plurality of the sensors are uniformly distributed on the circumference.
3. The system according to claim 2, wherein when the system includes an even number of sensors, the detecting a change in the spacing between the rotor and the stator based on the ratio comprises:
and detecting the change of the distance between the rotor and the stator according to the ratio of the signal values output by the two sensors which are opposite to each other on the circumference.
4. The system of claim 2, wherein when the system includes an odd number of sensors, the detecting a change in the spacing between the rotor and the stator based on the ratio comprises:
and detecting the change of the distance between the rotor and the stator according to the ratio of the signal values output by the two sensors with the largest angle difference on the circumference.
5. The system of any one of claims 1 to 4, further comprising, prior to detecting a change in separation between the rotor and the stator based on the ratio, the steps of:
detecting a fault sensor by comparing a plurality of ratios, and filtering out the ratio obtained by calculating the signal value output by the fault sensor;
the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
detecting a change in a spacing between the rotor and the stator based on the filtered ratio.
6. The system of any one of claims 1 to 4, further comprising, prior to detecting a change in separation between the rotor and the stator based on the ratio, the steps of:
determining the weight corresponding to the ratio according to the angle of the interval between the two sensors corresponding to the ratio;
the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
and detecting the change of the distance between the rotor and the stator according to the ratios and the weights corresponding to the ratios.
7. The system of any one of claims 1 to 4, wherein the processor is configured to perform the steps of:
calculating a rate of change of a plurality of said signal values;
the detecting a change in a distance between the rotor and the stator according to the ratio specifically includes:
detecting a change in a spacing between the rotor and the stator based on the rate of change and the ratio.
8. The system of claim 1, wherein the sensor is a capacitive sensor, a planar inductive sensor, or a magnetic sensor, and wherein the two electrodes of the capacitive sensor are in a plane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811268336.0A CN111102913A (en) | 2018-10-29 | 2018-10-29 | Online detection system for motor stator and rotor spacing change |
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| CN201811268336.0A CN111102913A (en) | 2018-10-29 | 2018-10-29 | Online detection system for motor stator and rotor spacing change |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300541A (en) * | 2021-05-21 | 2021-08-24 | 浙江大华技术股份有限公司 | Electric machine |
| CN114427571A (en) * | 2022-01-06 | 2022-05-03 | 广东美的暖通设备有限公司 | Magnetic bearing assembly, control method and device thereof, compressor and air conditioner |
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| CN1233746A (en) * | 1998-04-28 | 1999-11-03 | 丛玉良 | Method and device for test alignment of magnetic rotator of magnetic pump using external magnetism |
| CN103344321A (en) * | 2013-07-17 | 2013-10-09 | 华北电力大学 | Method and device used for detecting radial drifting of rotator based on electrostatic sensor arrays |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1233746A (en) * | 1998-04-28 | 1999-11-03 | 丛玉良 | Method and device for test alignment of magnetic rotator of magnetic pump using external magnetism |
| CN103344321A (en) * | 2013-07-17 | 2013-10-09 | 华北电力大学 | Method and device used for detecting radial drifting of rotator based on electrostatic sensor arrays |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300541A (en) * | 2021-05-21 | 2021-08-24 | 浙江大华技术股份有限公司 | Electric machine |
| CN114427571A (en) * | 2022-01-06 | 2022-05-03 | 广东美的暖通设备有限公司 | Magnetic bearing assembly, control method and device thereof, compressor and air conditioner |
| CN114427571B (en) * | 2022-01-06 | 2023-11-03 | 广东美的暖通设备有限公司 | Magnetic bearing assembly, control method and control device thereof, compressor and air conditioner |
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Application publication date: 20200505 |