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Radial displacement sensorless operation of PM type bearingless motor

NIAN Heng,HE Yi-kang(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)  
On the basis of analyzing the linear relation between the inductance of suspension winding and rotor radial displacement,a rotor radial displacement estimation scheme using high frequency signal injection in the suspension winding was suggested,which will meet the need of displacement-sensorless operation for a PM type bearingless motor.The rotor radial displacement detecting principle,such as the injection of high-frequency carrier signal,the differential voltage extraction in the suspension winding,the design of the tracking observations for rotor radial displacement estimation,and their implementation technique were all discussed.And then,the displacement sensorless control system of PM type bearingless motor was set up based on this radial displacement estimation approach.Simulation study demonstrates that the proposed method is capable of precisely estimating the rotor radial displacement in the full speed regions for a PM type bearingless motor and is able to achieve stable sensorless suspension operation.
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