Displacement signal conditioning method of displacement sensor for magnetic bearing

Abstract

The invention relates to a displacement sensor displacement signal conditioning method for a magnetic bearing. A magnetic bearing control system controls a power amplifier to apply sine current to AX and BX magnetic bearing coils, apply cosine current to AY and BY magnetic bearing coils, and to change the amplitude and frequency of the sine current and the cosine current, so that the magnetic bearing drives a rotor to slide along a mechanical protection bearing without a gap, an output peak-to-peak value of a displacement sensor is obtained, and output conditioning of the displacement sensor is performed as required. The method is simple to operate and easy to realize, brings great convenience to zero setting and offset adjustment of a signal of the displacement sensor, and improves the accuracy and efficiency of signal conditioning of the displacement sensor.

Description

technical field [0001] The invention relates to a displacement signal conditioning method of a displacement sensor for a magnetic bearing, which can be used for debugging of a magnetic bearing control system and detection of sensor faults. Background technique [0002] As the technology of maglev motors matures, its applications are becoming more and more extensive, such as maglev flywheels and maglev control torque gyroscopes in the aerospace field, high energy density motors in industrial production, and maglev air compressors in the clean energy field. , Molecular pump, etc. Magnetic levitation motors can be widely used mainly because they have the advantages of high speed, no contact, no friction, and long service life. The key technology is the use of magnetic bearings to control the stable operation of the rotor at high speed. The principle of the magnetic bearing control system: When the rotor deviates from the magnetic center position, the displacement sensor conver...

AI Technical Summary

Problems solved by technology

Due to the large magnetic gap and protective gap of the magnetic levitation motor, when the rotor deviates from the magnetic center, the bias force of the magnetic bearing on the rotor is very large, so that the rotor cannot reach the lowest point at some positions when using the method, and the weight of the motor is large. Very inconvenient to operate

When using the second method, the starting current of the high-power motor is very large, and the condition of vertical placement also greatly limits the application occasions

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