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《Proceedings of the Csee》 2003-11
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ANALYTICAL MODELING AND FEEDBACK CONTROL OF THE MAGNETIC LEVITATION FORCE FOR AN INDUCTION-TYPE BEARINGLESS MOTOR

NIAN Heng, HE Yi-kang (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)  
Due to the load disturbance and detecting error of radial displacement, the centers of stator and rotor of a bearingless motor do not coincide with each other in practical operation, which will influence the control performance of stable suspension. Based on its operation principle, a relatively accurate analytical expression of the magnetic levitation force for an induction-type bearingless motor is proposed in this paper with the eccentricity in the location of stator and rotor taking into consideration, and its computation accuracy is verified by ANSOFT, an electro-magnetic field analysis software of electrical machines. Applying this analytical levitation force model, the real-time observation of magnetic levitation force can be realized, the closed-loop control of levitation force is then implemented on the basis of air-gap-flux-oriented decoupling control system of the bearingless motor. Simulation study verifies the effectiveness of the approach in improving the static and dynamic performance of an induction-type bearingless motor.
【Fund】: 浙江省自然科学基金(502050)
【CateGory Index】: TM301
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