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General Analytical Model About Controllable Magnetic Suspension Force of Bearingless Motor

BU Wen-shao1, WAN Shan-ming2, HUANG Sheng-hua2, LIU Wen-sheng1 (1. College of Electronic Information Engineering, Henan University of Science and Technology, Luoyang 471003, Henan Province, China; 2. College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, China)  
To research the fundamental theory and common rules of bearingless motor, the analytical model on inductance of 4-pole bearingless motor with 2-pole controlling windings was given. Based on the inductance model and virtual displacement principle, the general analytical model on magnetic suspension force of bearingless motor in the direction of stationary reference axes had been derived. The general model on magnetic suspension force could be not only applicable to bearingless motor with salient-pole rotor, but also applicable to bearingless motor with cylindrical rotor. By setting different salient-pole parameter in the general magnetic suspension force model, the models on magnetic suspension force of different types of bearingless motor, such as: synchronous reluctance bearingless motor, bearingless induction motor, surface permanent magnet bearingless motor, were derived. Aiming at bearingless induction motor, the static magnetic suspension force experiment and analysis had been made. Experimental result proves the validity of the derived analytical model on controllable magnetic suspension force from an applied example.
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