CN113933762B - Method and system for measuring magnetic flux of rotor of variable frequency compressor - Google Patents
Method and system for measuring magnetic flux of rotor of variable frequency compressor Download PDFInfo
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- CN113933762B CN113933762B CN202111107237.6A CN202111107237A CN113933762B CN 113933762 B CN113933762 B CN 113933762B CN 202111107237 A CN202111107237 A CN 202111107237A CN 113933762 B CN113933762 B CN 113933762B
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- 230000004907 flux Effects 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000000737 periodic effect Effects 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 14
- 239000011261 inert gas Substances 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a method and a system for measuring magnetic flux of a rotor of a variable frequency compressor, wherein the method comprises the following steps: at the moment of stopping supplying power to the compressor, starting to collect back electromotive force generated by inertial rotation of a rotor of the compressor in real time; integrating the acquired back electromotive force to obtain a waveform of instantaneous relative magnetic flux, wherein the waveform of the instantaneous relative magnetic flux is a periodic waveform; and selecting a plurality of periods from the waveform of the instantaneous relative magnetic flux, calculating the difference value of the wave crest value minus the wave trough value of each period, and taking the average value of the difference values to obtain the magnetic flux of the compressor rotor. By adopting the technical scheme of the invention, the magnetic flux of the rotor of the variable frequency compressor can be measured rapidly and accurately.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a method and a system for measuring magnetic flux of a rotor of a variable frequency compressor.
Background
The magnetic flux is used as an important technical index of the compressor, and is detected in the design development and production processes, so that the quality of the compressor is judged.
At present, the factory detection magnetic flux equipment in the domestic compressor industry has the problems of large test fluctuation and low precision. The part of new variable frequency motors are designed with low back electromotive force, the back electromotive force feedback of the low back electromotive force compressor is only one period, the existing magnetic flux detection equipment cannot accurately collect magnetic flux, and the integration processing link in the process of calculating the back electromotive force has the problems of error accumulation and drift.
Disclosure of Invention
The invention mainly aims to provide a method and a system for measuring magnetic flux of a rotor of a variable frequency compressor, and aims to improve the measuring accuracy of the magnetic flux of the rotor of the variable frequency compressor.
In an embodiment of the present invention, a method for measuring a rotor magnetic flux of a variable frequency compressor is provided, which includes:
at the moment of stopping supplying power to the compressor, starting to collect back electromotive force generated by inertial rotation of a rotor of the compressor in real time;
integrating the acquired back electromotive force to obtain a waveform of instantaneous relative magnetic flux, wherein the waveform of the instantaneous relative magnetic flux is a periodic waveform;
and selecting a plurality of periods from the waveform of the instantaneous relative magnetic flux, calculating the difference value of the wave crest value minus the wave trough value of each period, and taking the average value of the difference values to obtain the magnetic flux of the compressor rotor.
In an embodiment of the present invention, the method for measuring magnetic flux of a rotor of a variable frequency compressor further includes:
when the power supply to the compressor is stopped, inert gas is injected into the compressor, and the inertia of the compressor rotor is increased.
In the embodiment of the invention, the calculation formula of the magnetic flux of the compressor is as follows:
wherein phi is t For actually measuring magnetic flux of the compressor at the temperature of T ℃, the unit is mAb, K is a counter electromotive force measuring proportionality coefficient, E is a real-time counter electromotive force, the unit is V, N is the number of selected waveforms, N is the current magnetic flux calculating period sequence number, T is the period of each waveform,represents the peak value in the nth period, < +.>Representing the valley values in the nth cycle.
In an embodiment of the present invention, the method for measuring magnetic flux of a rotor of a variable frequency compressor further includes:
the current temperature of the compressor is measured and the magnetic flux of the compressor at 20 ℃ is calculated from the current temperature of the compressor and the current magnetic flux of the compressor.
In the embodiment of the invention, the magnetic flux of the compressor at 20 ℃ is calculated by the following formula:
wherein phi is t Is measured magnetic flux of compressor at t deg.C, and has the unit of mAb 20 The magnetic flux of the compressor rotor at the temperature of 20 ℃ is expressed as mAb, k is a magnetic flux temperature compensation coefficient, t is the current measured temperature of the compressor, and the unit is the temperature.
In an embodiment of the present invention, there is also provided a system for measuring a magnetic flux of a rotor of a variable frequency compressor, including:
the back electromotive force acquisition module is used for starting to acquire the back electromotive force generated by inertial rotation of the rotor of the compressor in real time at the moment of stopping supplying power to the compressor;
the integration module is used for integrating the acquired back electromotive force to obtain a waveform of instantaneous relative magnetic flux, and the waveform of the instantaneous relative magnetic flux is a periodic waveform;
and the magnetic flux calculation module is used for selecting a plurality of periods from the waveform of the instantaneous relative magnetic flux, calculating the difference value of the wave crest value minus the wave trough value of each period, and taking the average value of the difference values as the magnetic flux of the compressor rotor.
In an embodiment of the present invention, the system for measuring magnetic flux of a rotor of a variable frequency compressor further includes:
and the air supply device is used for injecting inert gas into the compressor when the power supply to the compressor is stopped.
In the embodiment of the invention, the calculation formula of the magnetic flux of the compressor is as follows:
wherein phi is t For actually measuring magnetic flux of the compressor at the temperature of T ℃, the unit is mAb, K is a counter electromotive force measuring proportionality coefficient, E is a real-time counter electromotive force, the unit is V, N is the number of selected waveforms, N is the current magnetic flux calculating period sequence number, T is the period of each waveform,represents the peak value in the nth period, < +.>Representing the valley values in the nth cycle.
In an embodiment of the invention, the magnetic flux calculating module is further configured to calculate the magnetic flux of the compressor at 20 ℃ according to the current temperature of the compressor and the current magnetic flux of the compressor.
In the embodiment of the invention, the magnetic flux calculation module calculates the magnetic flux of the compressor at 20 ℃ according to the following formula:
wherein phi is t Is measured magnetic flux of compressor at t deg.C, and has the unit of mAb 20 The magnetic flux of the compressor rotor at the temperature of 20 ℃ is expressed as mAb, k is a magnetic flux temperature compensation coefficient, t is the current measured temperature of the compressor, and the unit is the temperature.
In the embodiment of the invention, the measuring system for the magnetic flux of the rotor of the variable frequency compressor further comprises a contactor arranged between the compressor controller and the compressor bus and a contactor arranged between the back electromotive force acquisition module and the compressor bus, wherein the contactor is used for powering off the compressor, and the contactor is used for connecting the back electromotive force acquisition module and the compressor bus when the compressor is powered off.
Compared with the prior art, the method and the system for measuring the magnetic flux of the rotor of the variable frequency compressor are adopted, the collected counter electromotive force is integrated to obtain the waveform of the instantaneous relative magnetic flux, then a plurality of periods are selected from the waveform of the instantaneous relative magnetic flux, the difference value of the peak value minus the trough value of each period is calculated, and the average value of the difference value is taken to obtain the magnetic flux of the rotor of the compressor, so that the problems of error accumulation and drift in the integral processing link of the counter electromotive force can be eliminated; in addition, by injecting inert gas into the compressor when the power is off, the inertia of the compressor rotor can be increased, and a longer-time counter electromotive force signal can be acquired.
Drawings
Fig. 1 is a schematic structural diagram of a system for measuring magnetic flux of a rotor of a variable frequency compressor according to an embodiment of the present invention.
Fig. 2 is a waveform diagram of instantaneous relative magnetic flux.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are given by way of illustration only and are not intended to be limiting.
As shown in fig. 1, in an embodiment of the present invention, there is provided a measuring system for rotor magnetic flux of a variable frequency compressor, which includes a contactor 1, a relay 2, a back electromotive force acquisition module 3, an integration module 4, and a magnetic flux calculation module 5. The following description will be given separately.
The contactor 1 is arranged between a compressor bus and a compressor controller and is used for controlling whether the compressor controller supplies power to the compressor.
The relay 2 is arranged between the back electromotive force collection module 3 and the compressor bus, and is used for conducting the back electromotive force collection module 3 and the compressor bus at the moment when the contactor 1 is disconnected.
And the back electromotive force acquisition module 3 is used for starting to acquire the back electromotive force generated by the inertial rotation of the compressor rotor in real time at the moment of stopping the power supply to the compressor. The back electromotive force collection module 3 includes a resistor plate for sampling the voltage of the bus of the compressor in a step-down manner, so as to collect the back electromotive force generated by the rotor of the compressor. The resistance of the resistive plate can be set to obtain different back emf measurement scaling factors K.
The integrating module 4 is configured to integrate the collected back electromotive force to obtain a waveform of the instantaneous relative magnetic flux. As shown in fig. 2, the waveform of the instantaneous relative magnetic flux is a periodic waveform.
The magnetic flux calculating module 5 is configured to select a plurality of periods from the waveforms of the instantaneous relative magnetic fluxes, calculate a difference value of a peak value minus a trough value of each period, and take an average value of the difference values, that is, the magnetic flux of the compressor rotor.
In the embodiment of the invention, the calculation formula of the magnetic flux of the compressor is as follows:
wherein phi is t For actually measuring magnetic flux of the compressor at the temperature of T ℃, the unit is mAb, K is a counter electromotive force measuring proportionality coefficient, E is a real-time counter electromotive force, the unit is V, N is the number of selected waveforms, N is the current magnetic flux calculating period sequence number, T is the period of each waveform,represents the peak value in the nth period, < +.>Representing the valley values in the nth cycle.
The derivation of the above formula is as follows:
according to the relation between magnetic flux and back electromotive force:available->Considering that the magnetic flux of the compressor rotor is the pole difference of the real-time magnetic flux of each angle of the rotor in the stator, measuring the proportionality coefficient K by the counter electromotive force of the hardware design, and taking the tie value of the magnetic flux of a plurality of periods to remove the hardware error, thereby obtaining the formula.
The magnetic flux calculating module 5 is further used for calculating the magnetic flux of the compressor at 20 ℃ according to the current temperature of the compressor and the current magnetic flux of the compressor. Specifically, the magnetic flux calculation module calculates the magnetic flux of the compressor at 20 ℃ by the following formula:
wherein phi is t Is measured magnetic flux of compressor at t deg.C, and has the unit of mAb 20 The magnetic flux of the compressor rotor at the temperature of 20 ℃ is expressed as mAb, k is a magnetic flux temperature compensation coefficient, t is the current measured temperature of the compressor, and the unit is the temperature.
In general, when the quality of the compressor is evaluated, the magnetic flux of the rotor of the compressor at 20 ℃ needs to be evaluated, and therefore, after the current magnetic flux of the rotor of the compressor is measured, the magnetic flux of the rotor of the compressor at 20 ℃ needs to be converted according to the current temperature and the current magnetic flux.
Further, the measuring system of the magnetic flux of the rotor of the variable frequency compressor further comprises an air supply device (not shown), wherein the air supply device is used for injecting inert gas into the compressor when the power supply to the compressor is stopped, so that the inertia of the rotor of the compressor is increased, the rotation time of the rotor of the compressor after the power supply is stopped is improved, the collection time of back electromotive force is increased, and more sample periods are accumulated for the magnetic flux of the rotor of the compressor in a follow-up calculation mode.
The working process of the measuring system for the magnetic flux of the rotor of the variable frequency compressor is as follows:
at the moment when the contactor 1 is opened, inert gas is injected into the compressor, and the relay 2 is turned on;
the back electromotive force acquisition module 3 starts to acquire back electromotive force generated by inertial rotation of the compressor rotor in real time;
the integration module 4 integrates the acquired back electromotive force to obtain a waveform of instantaneous relative magnetic flux;
the magnetic flux calculation module 5 selects a plurality of periods from the waveform of the instantaneous relative magnetic flux, calculates the difference value of the wave crest value minus the wave trough value of each period, and takes the average value of the difference values to obtain the magnetic flux of the current compressor rotor;
the current temperature of the compressor is measured and the magnetic flux calculation module 5 calculates the magnetic flux of the compressor rotor at 20 c based on the current temperature of the compressor and the current magnetic flux of the compressor rotor.
It will be appreciated by those skilled in the art that the integrating module 4 and the magnetic flux calculating module 5 may be separate hardware modules or may be software modules running in a computer, and the present invention is not limited thereto.
In summary, by adopting the technical scheme of the invention, the acquired back electromotive force is integrated to obtain the waveform of the instantaneous relative magnetic flux, then a plurality of periods are selected from the waveform of the instantaneous relative magnetic flux, the difference value of the peak value minus the trough value of each period is calculated, and the average value of the difference value is taken to be the magnetic flux of the compressor rotor, so that the problems of error accumulation and drift in the back electromotive force integration processing link can be eliminated; in addition, by injecting inert gas into the compressor when the power is off, the inertia of the compressor rotor can be increased, and a longer-time counter electromotive force signal can be acquired.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (11)
1. A method for measuring magnetic flux of a rotor of a variable frequency compressor, comprising:
at the moment of stopping supplying power to the compressor, starting to collect back electromotive force generated by inertial rotation of a rotor of the compressor in real time;
integrating the acquired back electromotive force to obtain a waveform of instantaneous relative magnetic flux, wherein the waveform of the instantaneous relative magnetic flux is a periodic waveform;
and selecting a plurality of periods from the waveform of the instantaneous relative magnetic flux, calculating the difference value of the wave crest value minus the wave trough value of each period, and taking the average value of the difference values to obtain the magnetic flux of the compressor rotor.
2. The method for measuring the magnetic flux of a rotor of a variable frequency compressor according to claim 1, further comprising:
when the power supply to the compressor is stopped, inert gas is injected into the compressor, and the inertia of the compressor rotor is increased.
3. The method for measuring magnetic flux of rotor of inverter compressor according to claim 1, wherein the calculation formula of the magnetic flux of the compressor is as follows:
wherein phi is t For actually measuring magnetic flux of the compressor at the temperature of T ℃, the unit is mAb, K is a counter electromotive force measuring proportionality coefficient, E is a real-time counter electromotive force, the unit is V, N is the number of selected waveforms, N is the current magnetic flux calculating period sequence number, T is the period of each waveform,represents the peak value in the nth period, < +.>Representing the valley values in the nth cycle.
4. The method for measuring the magnetic flux of a rotor of a variable frequency compressor according to claim 1, further comprising:
the current temperature of the compressor is measured and the magnetic flux of the compressor at 20 ℃ is calculated from the current temperature of the compressor and the current magnetic flux of the compressor.
5. The method of measuring the magnetic flux of a rotor of a variable frequency compressor as set forth in claim 4, wherein the magnetic flux of the compressor at 20 ℃ is calculated by the following formula:
wherein phi is t Is measured magnetic flux of compressor at t deg.C, and has the unit of mAb 20 The magnetic flux of the compressor rotor at the temperature of 20 ℃ is expressed as mAb, k is a magnetic flux temperature compensation coefficient, t is the current measured temperature of the compressor, and the unit is the temperature.
6. A system for measuring the magnetic flux of a rotor of a variable frequency compressor, comprising:
the back electromotive force acquisition module is used for starting to acquire the back electromotive force generated by inertial rotation of the rotor of the compressor in real time at the moment of stopping supplying power to the compressor;
the integration module is used for integrating the acquired back electromotive force to obtain a waveform of instantaneous relative magnetic flux, and the waveform of the instantaneous relative magnetic flux is a periodic waveform;
and the magnetic flux calculation module is used for selecting a plurality of periods from the waveform of the instantaneous relative magnetic flux, calculating the difference value of the wave crest value minus the wave trough value of each period, and taking the average value of the difference values as the magnetic flux of the compressor rotor.
7. The variable frequency compressor rotor magnetic flux measurement system of claim 6, further comprising:
and the air supply device is used for injecting inert gas into the compressor when the power supply to the compressor is stopped.
8. The variable frequency compressor rotor magnetic flux measurement system of claim 6 wherein the compressor magnetic flux is calculated as:
wherein phi is t For actually measuring magnetic flux of the compressor at the temperature of T ℃, the unit is mAb, K is a counter electromotive force measuring proportionality coefficient, E is a real-time counter electromotive force, the unit is V, N is the number of selected waveforms, N is the current magnetic flux calculating period sequence number, T is the period of each waveform,represents the peak value in the nth period, < +.>Representing the valley values in the nth cycle.
9. The variable frequency compressor rotor magnetic flux measurement system of claim 6 wherein the magnetic flux calculation module is further configured to calculate a magnetic flux of the compressor at 20 ℃ based on a current temperature of the compressor and a current magnetic flux of the compressor.
10. The variable frequency compressor rotor magnetic flux measurement system of claim 9 wherein the magnetic flux calculation module calculates the magnetic flux of the compressor at 20 ℃ by the formula:
wherein phi is t Is measured magnetic flux of compressor at t deg.C, and has the unit of mAb 20 The magnetic flux of the compressor rotor at the temperature of 20 ℃ is expressed as mAb, k is a magnetic flux temperature compensation coefficient, t is the current measured temperature of the compressor, and the unit is the temperature.
11. The variable frequency compressor rotor magnetic flux measurement system of claim 6 further comprising a contactor disposed between a compressor controller and a compressor bus and a contactor disposed between the back emf collection module and a compressor bus, the contactor for de-energizing a compressor, the contactor for communicating the back emf collection module and the compressor bus when the compressor is de-energized.
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| CN202111107237.6A CN113933762B (en) | 2021-09-22 | 2021-09-22 | Method and system for measuring magnetic flux of rotor of variable frequency compressor |
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