DSP-Based Control of Sensorless IPMSM Drives for Wide-Speed-Range Operation

• Published in: IEEE transactions on industrial electronics (1982) 2013-02, Vol.60 (2), p.720-727
• Main Authors: Wang, Gaolin, Yang, Rongfeng, Xu, Dianguo
• Format: Article
• Language: English
• Subjects: Digital control; Digital signal processing; Hafnium; interior permanent magnet synchronous motor (IPMSM) drive; Observers; position sensorless; Rotors; Sensorless control; Stators; wide-speed-range operation
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2012.2205360

A position sensorless control strategy of an interior permanent magnet synchronous motor (IPMSM) drive based on a digital signal processor (DSP) is proposed. To achieve sensorless wide-speed-range operation, a hybrid position estimation strategy combining the high frequency (HF) signal injection method with the electromotive force (EMF)-based method is presented. At low-speed range, an HF voltage signal is injected, and a rotor position observer is designed to improve the robustness to the load disturbance. At middle- and high-speed ranges, a sliding-mode observer based on the extended EMF of IPMSM is designed for sensorless operation. Moreover, during the switch-over area, the two position estimation methods are both enabled for the sensorless control. A software phase-locked loop and a dead-time compensation strategy are adopted to improve the position estimation accuracy. The experimental results demonstrate the feasibility of the control strategy with a sensorless IPMSM drive based on a DSP.