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For magnetic bearings (MBs), traditional measurement method of rotor displacement is to use a displacement sensor. However, equipment of displacement sensors will increase the cost and volume of MBs. Furthermore, many factors can affect the accuracy of displacement sensor, such as installation error, magnetic flux leakage, temperature drift and so on. This paper proposed a rotor displacement measurement method for magnetic bearing based on coil inductance. With this method, no displacement sensor was needed. The magnetic bearing structure to be tested was introduced briefly. The measurement principle and method were analyzed in detail. The validity of the measurement method is verified by simulation.

A Rotor Displacement Measurement Method for Magnetic Bearing Based on Coil Inductance