Radial magnetic bearing electrical vortex sensor integrated structure for magnetic levitation high-speed electric machine

Abstract

The invention provides a radial magnetic bearing electrical vortex sensor integrated structure for a magnetic levitation high-speed electric machine, consisting of four radial displacement sensor probes for detecting radial displacement signals, a permanent magnet biased hybrid magnetic bearing controlling the levitation of a rotor and an external sensor signal processing circuit, wherein the sensor probes are integrated in the permanent magnet biased hybrid magnetic bearing, and sensor probe preamplifier circuits are integrated together to be put in a control box of a magnetic levitation electric machine to be separated from the sensor probes. According to the radial magnetic bearing electrical vortex sensor, the space of the magnetic levitation electric machine can be greatly saved, the work efficiency of the magnetic levitation electric machine can be improved, the influence of the temperature drift to the sensor can be reduced, the stability of the magnetic levitation electric machine can be improved, the applicable place of the magnetic levitation electric machine can be enlarged, and the whole performance of the magnetic levitation electric machine can be prominently improved.

Description

technical field [0001] The invention relates to a non-contact eddy current sensor, especially an eddy current sensor integrated with a magnetic bearing used in a magnetic levitation high-speed motor, which can be used as a blower, a compressor and a vacuum pump to control the volume, weight and accuracy of the system, etc. Non-contact displacement sensor with strict requirements. Background technique [0002] Magnetic bearings have the advantages of no mechanical friction and wear, no need for lubrication and maintenance, allowing the rotor to rotate at high speed, long life, high reliability, etc. It has been applied in many fields, and the application field is still expanding. The use of magnetic bearings usually requires the cooperation of sensors to achieve the purpose of stable suspension. In the magnetic levitation high-speed motor, it is necessary to detect the displacement signals of five degrees of freedom. The existing structure uses eddy current sensors, and each...

AI Technical Summary

Problems solved by technology

The use of magnetic bearings usually requires the cooperation of sensors to achieve the purpose of stable suspension. In the magnetic levitation high-speed motor, it is necessary to detect the displacement signals of five degrees of freedom. The existing structure uses eddy current sensors, and each degree of freedom requires a non-contact displacement sensor. In order to improve the accuracy of the sensor, a differential structure is usually adopted. At this time, each magnetic levitation system requires multiple eddy current sensors. This mode of separating the sensor from the magnetic bearing will greatly increase the length of the motor rotor. state, it is easy to cause the bending vibration of the rotor, which is not conducive to the stable operation of the magnetic levitation motor and reduces the maximum operating frequency of the magnetic levitation motor; in addition, most of the existing eddy current sensors integrate the preamplifier circuit and the sensor probe inside the motor , and the performance of electronic components such as operational amplifiers, resistors, capacitors, and diodes that make up the amplifier circuit is easily affected by temperature, and it is very easy to burn out in a certain vibration or humid environment. The fragility of this amplifier circuit makes it difficult for the motor to Work in harsh environments such as strong vibration and humidity

Therefore, the existing eddy current sensors are not compact in structure and poor in environmental adaptability, which greatly limits the use environment and operating frequency of magnetic levitation rotating mechanisms such as magnetic levitation motors and magnetic levitation compressors.

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