High-Precision Rotor Position Correction Strategy for High-Speed Permanent Magnet Synchronous Motor Based on Resolver

Abstract

A high-precision rotor position correction strategy for a 2.5 kW@10 000 r/min permanent magnet synchronous motor (PMSM) based on the resolver is proposed in this article. The resolver as the rotor position sensor for PMSM has the advantage of long service life and high anti-interference. However, it is common that the unbalance amplitude of the resolver signal and the nonideal resolver-to-digital converter cause the rotor position estimation error. To solve these problems, a self-adaption rotor position correction strategy is proposed. First, the relationship between the q-axis current and the rotor position estimation error is analyzed. The error from estimate and the imbalances of the resolver-to-digital converter circuit are decoupled. Then, a rotor position correction strategy based on self-adaption controller is presented, and the self-adaption controller can compensate the estimation error both from unbalance amplitude of the resolver signal and the nonideal resolver-to-digital converter. Finally, the effectiveness and feasibility of the correction strategy are verified by the experiments on a 2.5 kW@10 000 r/min PMSM platform.