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| Radial Force Feedback Control for a Bearingless Induction Spindle Motor |
| Zhan Lixin, Zhou Kai |
| Deparment of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China |
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Abstract In bearingless induction motors, the correctness in the magnetic field orientation of the torque windings always affects the suspension performance, and the time delay caused by sampling period and current regulation leads to phase-lag in the controller. To overcome these problems, a radial force feedback control scheme is proposed in this paper. Herein, radial forces are calculated from the torque winding flux and suspension winding flux, which are detected from the search coils wounded around stator teeth. The detected radial forces are used as feedback signals to suppress the time delay. Thus, the phase-lag problem can be solved. The effectiveness of the proposed control scheme is verified by simulation and experimental results. The proposed control system has much better dynamic performance, damping and robustness, compared with the conventional suspension control system.
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Received: 26 February 2014
Published: 01 April 2016
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2016, Vol. 31 
