CN115218771B - Temperature compensation method and system for eddy current displacement sensor of magnetic suspension blower - Google Patents
Temperature compensation method and system for eddy current displacement sensor of magnetic suspension blower Download PDFInfo
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- CN115218771B CN115218771B CN202210815496.2A CN202210815496A CN115218771B CN 115218771 B CN115218771 B CN 115218771B CN 202210815496 A CN202210815496 A CN 202210815496A CN 115218771 B CN115218771 B CN 115218771B
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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
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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Abstract
The application provides a temperature compensation method and system for an eddy current displacement sensor of a magnetic suspension blower. The method comprises the following steps: acquiring a curve of the output voltage signal value of the eddy current displacement sensor changing along with the position change of a rotor of the magnetic suspension blower at normal temperature, and determining an optimal working point; dividing a temperature range between a lowest temperature value of a working environment of the magnetic suspension blower and a highest temperature value of a stator of the magnetic suspension blower into N temperature change intervals, wherein N is a positive integer; measuring delta T in temperature change interval of eddy current displacement sensor i When the current vortex displacement sensor is at the optimal working point, the current vortex displacement sensor outputs the actual voltage under the real working environment; according to a standard temperature interval Delta T s And correcting the output voltage of the eddy current displacement sensor by the voltage of the internal optimal working point and the actual output voltage of the eddy current displacement sensor in the real working environment. The technical scheme of this application can reduce the influence of temperature to displacement sensor, improves the suspension precision of magnetic suspension centrifugal blower rotor.
Description
Technical Field
The application relates to a magnetic suspension blower, in particular to a temperature compensation method and system for an eddy current displacement sensor of a magnetic suspension blower.
Background
The air blower has wide application field, and the figure of the air blower can be seen from daily life to the aerospace field. The types of blowers vary and include, for example, roots blowers, rotary blowers, centrifugal blowers, and the like. Because the rotor of the magnetic suspension centrifugal blower is in no contact with the bearing and has no friction, the energy-saving effect is good, the market acceptance is higher and higher at present, and the market application scene is wider.
The higher the power of the magnetic suspension centrifugal blower is, the more obvious the energy-saving effect is, so the power of the magnetic suspension centrifugal blower sold on the market is usually not lower than 50kw. However, in the working process of the magnetic suspension centrifugal blower, the temperature of the blower body is high, even if the blower body is driven by a permanent magnet synchronous motor with higher energy efficiency, the temperature of the blower body is often close to 100 ℃ or even higher, the conventional eddy current displacement sensor can only be adapted to the actual working environment temperature of the magnetic suspension centrifugal blower, and is usually-20 ℃ to 50 ℃, the normal working temperature of the eddy current displacement sensor is usually not more than 40 ℃, a few eddy current displacement sensors can only not be more than 80 ℃, and obviously the operating requirements can not be met.
Disclosure of Invention
In view of this, the present application provides a temperature compensation method and system for an eddy current displacement sensor of a magnetic suspension blower.
According to one aspect of the application, a method for temperature compensation of an eddy current displacement sensor of a magnetic levitation blower is provided, which comprises the following steps:
acquiring a curve of the output voltage signal value of the eddy current displacement sensor changing along with the position change of a rotor of the magnetic suspension blower at normal temperature, and determining an optimal working point;
dividing the temperature range between the lowest temperature value of the working environment of the magnetic suspension blower and the highest temperature value of the stator of the magnetic suspension blower into N temperature change intervals, wherein the temperature change intervals comprise delta T 1 ,ΔT 2 ,ΔT 3 ,……,ΔT N Wherein N is a positive integer;
measuring delta T in temperature change interval of eddy current displacement sensor i When the current vortex displacement sensor is at the optimal working point, the actual output voltage of the current vortex displacement sensor under the real working environment is represented by i which is a positive integer and is more than or equal to 1 and less than or equal to N;
according to a standard temperature interval Delta T s And correcting the output voltage of the eddy current displacement sensor by the voltage corresponding to the internal optimal working point and the actual output voltage of the eddy current displacement sensor in the real working environment.
Preferably, the method further comprises: at temperature variation interval Delta T i Actual output voltage value array U of internal sampling eddy current displacement sensor in real working environment ij Inductance value series L of current vortex displacement sensor coil ij And a coil resistance value array R ij Wherein j is more than or equal to 1 and less than or equal to n, j and n are whole integers, and n is delta T in the temperature change interval i The number of sample points.
Preferably, the temperature variation interval Δ T i Comprises a uniform temperature rise stage, a heat preservation stage and a furnace cooling stage。
Preferably, the method further comprises a temperature change interval Δ T i Internal calculation actual output voltage value sequence U ij Average value of (2)Inductance value series L of current vortex displacement sensor coil ij Average value of (2)And a coil resistance value array R ij Average value of (2);
Preferably, the method further comprises:
at temperature variation interval Delta T i Inner, the inductance value sequence L of the current vortex displacement sensor coil ij Average value of (2)And a coil resistance value array R ij Average value of (2)Substituting the circuit model of the eddy current displacement sensor to calculate and obtain the calculated value of the output voltageAnd is connected to the actual output voltage in series U ij Average value of (2)And comparing and determining the actual output voltage to be corrected.
Preferably, the method further comprises:
the actual output voltage to be corrected is separated from the standard temperature range delta T s The difference between the corresponding voltages is inverted, and the operation output voltage is added to the inverted result to obtain the corrected actual output voltage, wherein the standard temperature interval delta T s Is a temperature interval at normal temperature, a length of the temperature interval and delta T i The same is true.
The application also provides a magnetic suspension blower eddy current displacement sensor temperature compensation system, includes:
a sampling module for sampling the temperature change interval delta T of the eddy current displacement sensor i When the current vortex displacement sensor is at the optimal working point, the actual output voltage of the current vortex displacement sensor under the real working environment is represented by i which is a positive integer and is more than or equal to 1 and less than or equal to N; the temperature range between the lowest temperature value of the working environment of the magnetic suspension blower and the highest temperature value of the stator of the magnetic suspension blower is divided into N temperature change intervals, and the temperature change intervals comprise delta T 1 ,ΔT 2 ,ΔT 3 ,……,ΔT N Wherein N is a positive integer;
the sensor control module is used for processing the displacement signal sensed by the eddy current displacement sensor to form a voltage signal;
a magnetic bearing control module for controlling the magnetic bearing according to a standard temperature interval Delta T s Correcting the output voltage of the eddy current displacement sensor by the voltage corresponding to the internal optimal working point and the actual output voltage of the eddy current displacement sensor in a real working environment, converting the output voltage into a control signal and inputting the control signal to the power amplification module;
and the power amplification module is used for amplifying the control signal transmitted by the magnetic bearing control module and outputting corresponding exciting current to control the position of the rotor of the magnetic suspension blower.
Preferably, the sampling module is further used for sampling the actual output electricity of the eddy current displacement sensor in the real working environmentArray of pressing U ij Inductance value series L of current vortex displacement sensor coil ij And a coil resistance value array R ij The temperature range between the lowest temperature value of the working environment of the magnetic suspension blower and the highest temperature value of the stator of the magnetic suspension blower is divided into N temperature change intervals, and the temperature change intervals comprise delta T 1 ,ΔT 2 ,ΔT 3 ,……,ΔT N Wherein N is a positive integer, i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to N, j and N are whole integers, and N is delta T in the temperature change interval i The number of sampling points;
a magnetic bearing control module for controlling the magnetic bearing i Internal calculation actual output voltage value sequence U ij Average value of (2)Inductance value series L of current vortex displacement sensor coil ij Average value of (2)And a coil resistance value array R ij Average value of (2);
Preferably, the magnetic bearing control module is also used for the temperature change interval Delta T i Inner, the inductance value series L of the current vortex displacement sensor coil ij Average value of (2)And a coil resistance value array R ij Average value of (2)Substituting the circuit model of the eddy current displacement sensor to calculate to obtain the calculated value of the output voltageAnd is connected to the actual output voltage in series U ij Average value of (2)And comparing and determining the actual output voltage to be corrected.
Preferably, the magnetic bearing control module is also used for enabling the actual output voltage to be corrected to be within a standard temperature interval delta T s The difference between the voltages corresponding to the internal optimal working point is inverted, and the operation output voltage is added with the inverted result to obtain the corrected actual output voltage, wherein the standard temperature interval delta T s Is a temperature interval at normal temperature, a length of the temperature interval and delta T i The same is true.
According to the technical scheme of this application, through revising sensor actual operation result, can reduce the influence of temperature to displacement sensor, improve the suspension precision of magnetic suspension centrifugal blower rotor.
Additional features and advantages of the present application will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application, and the illustrative embodiments and descriptions thereof are used to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a temperature compensation system of an eddy current displacement sensor of a magnetic suspension blower;
FIG. 2 is a flow chart of a temperature compensation method for an eddy current displacement sensor of a magnetic suspension blower;
FIG. 3 is a graph showing the variation of the output voltage signal value of the eddy current displacement sensor with the position of the conductor to be measured;
fig. 4 is a schematic diagram of an eddy current displacement sensor circuit model.
Detailed Description
In addition, the features of the embodiments and the respective embodiments in the present application may be combined with each other without conflict.
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The magnetic suspension centrifugal blower compensation system provided by the embodiment of the application is shown in fig. 1 and comprises a sampling module, a sensor control module, a magnetic bearing control module and a power amplification module. Preferably, a PLC module is also included. And the sampling module is used for sampling signals of the eddy current displacement sensor (namely the probe) and the temperature sensor (namely pt 100). And the PLC module is mainly used for displaying signals of the eddy current displacement sensor and the temperature sensor in channels. Two magnets are shown in fig. 1, oppositely disposed: electromagnet A and electromagnet B.
The sampling module is used for sampling the actual output voltage sequence U of the eddy current displacement sensor in the real working environment ij Inductance value series L of current vortex displacement sensor coil ij And a coil resistance value array R ij The temperature range between the lowest temperature value of the working environment of the magnetic suspension blower and the highest temperature value of the stator of the magnetic suspension blower is divided into N temperature change intervals, and the temperature change intervals comprise delta T 1 ,ΔT 2 ,ΔT 3 ,……,ΔT N Wherein N is a positive integer, i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to N, j and N are whole integers, and N is delta T in a temperature change interval i The number of sampling points;
the sensor control module is used for processing the displacement signal sensed by the eddy current displacement sensor to form a voltage signal; the signal is output to the PLC module for data recording and displaying, and is simultaneously transmitted to the magnetic bearing controller to participate in the magnetic bearing control.
Magnetic bearing control module based on standard temperature interval delta T s Voltage corresponding to internal optimal working point and actual output voltage of eddy current displacement sensor in real working environment to eddy current displacementThe output voltage of the sensor is corrected and converted into a control signal which is input to the power amplification module.
And the power amplification module is used for amplifying the control signal transmitted by the magnetic bearing control module and outputting corresponding exciting current to control the position of the magnetic bearing rotor and simultaneously transmitting the current change value to the PLC module.
The PLC module records a displacement signal output by the displacement sensor, converts the displacement signal into a conventional position signal and displays the conventional position signal on a screen; and simultaneously recording a current signal output by the power amplification module, and simultaneously judging the position deviation and the stress deviation of the rotor part of the magnetic bearing according to the current signal and the displacement signal. The PLC module can comprise a plurality of channels and simultaneously records time, temperature and output voltage of the displacement sensor.
Correspondingly, the application also provides a temperature compensation method for the eddy current displacement sensor of the magnetic suspension centrifugal blower, which comprises the following steps:
,R 1 And L 1 Is the resistance and inductance of the sensor coil, R 2 And L 2 The equivalent resistance and the equivalent inductance of a magnetic suspension blower rotor eddy current loop coil, C is coupling capacitance, M is mutual inductance coefficient, R is S Is a coupling resistor (with the sensor coil L) 1 Coupling capacitor C forming a resonant circuit), U 0 In order to excite the peak value of the signal,is the circuit operating angular frequency.
It should be noted that the actual output voltage signal of the sensor in the simulated environment is the output voltage signal when the position of the rotor is just above the optimal operating point from the sensor.
The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. A temperature compensation method for an eddy current displacement sensor of a magnetic suspension blower is characterized by comprising the following steps:
acquiring a curve of the output voltage signal value of the eddy current displacement sensor changing along with the position change of a rotor of the magnetic suspension blower at normal temperature, and determining an optimal working point;
dividing the temperature range between the lowest temperature value of the working environment of the magnetic suspension blower and the highest temperature value of the stator of the magnetic suspension blower into N temperature change intervals, wherein the temperature change intervals comprise delta T 1 ,ΔT 2 ,ΔT 3 ,……,ΔT N Wherein N is a positive integer;
measuring delta T in temperature change interval of eddy current displacement sensor i When the current vortex displacement sensor is at the optimal working point, the actual output voltage of the current vortex displacement sensor under the real working environment, i is a positive integer, and i is more than or equal to 1 and less than or equal to N;
according to a standard temperature interval Delta T s Voltage corresponding to internal optimal working point and eddy current displacement sensor under real working environmentThe actual output voltage of (2) corrects the output voltage of the eddy current displacement sensor.
2. The method of claim 1, further comprising: at temperature variation interval Delta T i Actual output voltage value array U of internal sampling eddy current displacement sensor in real working environment ij Inductance value series L of current vortex displacement sensor coil ij And a coil resistance value array R ij Wherein j is more than or equal to 1 and less than or equal to n, j and n are positive integers, and n is delta T in the temperature change interval i The number of sample points.
3. Method according to claim 1, characterized in that the temperature variation interval Δ T i Comprises a constant-speed heating stage, a heat preservation stage and a furnace cooling stage.
4. The method of claim 1, further comprising a delta T over the temperature change interval i Internal calculation actual output voltage value sequence U ij Average value of (2)Series L of inductance values of coils of eddy current displacement sensor ij Average value of (2)And a coil resistance value array R ij Average value of (2);
5. The method of claim 4, further comprising:
at temperature variation interval Delta T i Inner, the inductance value series L of the current vortex displacement sensor coil ij Average value of (2)And a coil resistance value array R ij Average value of (2)Substituting the circuit model of the eddy current displacement sensor to calculate and obtain the calculated value of the output voltageAnd is connected to the actual output voltage in series U ij Average value of (2)And comparing and determining the actual output voltage to be corrected.
6. The method of claim 5, further comprising:
the actual output voltage to be corrected is separated from the standard temperature range delta T s The difference between the corresponding voltages is inverted, and the running output voltage and the inverted result are added to obtain the corrected actual output voltage, wherein the standard temperature interval delta T s Is a temperature interval at normal temperature, a temperature interval length and delta T i The same is true.
7. A temperature compensation system for an eddy current displacement sensor of a magnetic suspension blower is characterized by comprising:
a sampling module for sampling the temperature change interval Delta T of the eddy current displacement sensor i When the current vortex displacement sensor is at the optimum working point, the current vortex displacement sensor is in real working environmentThe i is a positive integer, and is more than or equal to 1 and less than or equal to N; the temperature range between the lowest temperature value of the working environment of the magnetic suspension blower and the highest temperature value of the stator of the magnetic suspension blower is divided into N temperature change intervals, and the temperature change intervals comprise delta T 1 ,ΔT 2 ,ΔT 3 ,……,ΔT N Wherein N is a positive integer;
the sensor control module is used for processing the displacement signal sensed by the eddy current displacement sensor to form a voltage signal;
magnetic bearing control module based on standard temperature interval delta T s Correcting the output voltage of the eddy current displacement sensor by the voltage corresponding to the internal optimal working point and the actual output voltage of the eddy current displacement sensor in a real working environment, converting the output voltage into a control signal and inputting the control signal to the power amplification module;
and the power amplification module is used for amplifying the control signal transmitted by the magnetic bearing control module and outputting corresponding exciting current to control the position of the rotor of the magnetic suspension blower.
8. The system of claim 7, wherein the sampling module is further configured to sample the actual output voltage sequence U of the eddy current displacement sensor under the real operating environment ij Inductance value series L of current vortex displacement sensor coil ij And a coil resistance value array R ij The temperature range between the lowest temperature value of the working environment of the magnetic suspension blower and the highest temperature value of the stator of the magnetic suspension blower is divided into N temperature change intervals, and the temperature change intervals comprise delta T 1 ,ΔT 2 ,ΔT 3 ,……,ΔT N Wherein N is a positive integer, i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to N, j and N are positive integers, and N is delta T in the temperature change interval i The number of sampling points;
a magnetic bearing control module for controlling the magnetic bearing i Internal calculation actual output voltage value sequence U ij Average value of (2)Inductance of eddy current displacement sensor coilSequence of values L ij Average value of (2)And a coil resistance value array R ij Average value of (2);
9. The system of claim 8, wherein the magnetic bearing control module is further configured to control the magnetic bearing during the temperature change interval Δ T i Inner, the inductance value series L of the current vortex displacement sensor coil ij Average value of (2)And a coil resistance value array R ij Average value of (2)Substituting the circuit model of the eddy current displacement sensor to calculate and obtain the calculated value of the output voltageAnd is connected to the actual output voltage in series U ij Average value of (2)And comparing and determining the actual output voltage to be corrected.
10. The system of claim 9The system is characterized in that the magnetic bearing control module is also used for comparing the actual output voltage to be corrected with the standard temperature interval delta T s The difference of the voltages corresponding to the internal optimal working point is inverted, and the operation output voltage is added with the inverted result to obtain the corrected actual output voltage, wherein the standard temperature interval delta T s Is a temperature interval at normal temperature, a length of the temperature interval and delta T i The same is true.
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