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A Variable Structure PI Controller for Permanent Magnetic Synchronous Motor Speed-regulation System
Pages: 237-242
Year: Issue:  12
Journal: Transactions of China Electrotechnical Society

Keyword:  permanent magnetic synchronous motorPIIPovershootinput derivative feedforward;
Abstract: In permanent magnetic synchronous motor(PMSM) speed adjusting system, to conventional PI controller, overshoot of step response is hard to avoid. Although IP control can eliminate overshoot, response becomes slow, which leads to poor tracking performance. In this paper, a variable structure PI controller is proposed, which adopts input derivative feedforward(IDF) and changes the parallel structure between error proportion and error integral into the cascaded structure between error proportion and integral based on conventional PI controller.With stop integrating at limit, VSPI controller is equal to PI controller for time-varying input and equal to IP controller for step input, thus overshoot is eliminated and tracking accuracy is high. Extensive experiments are performed to verify the validity and practicality of the proposed controller.
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