Electromechanical Coupling Resonance Analysis and Compensation Strategy of IPMSM Drive System Considering Current Measurement Offset Error

The current measurement offset errors (CMOEs) raise concerns regarding the performance degradation of interior permanent-magnet synchronous motor (IPMSM) drive system. Considering this, a detailed analysis of the impact of CMOE is conducted in this paper, and a compensation strategy is proposed. Based on the established dual-inertia model of the IPMSM drive system, the effects of CMOE on electromechanical coupling resonance are analyzed. Furthermore, the CMOE compensation scheme based on an improved adaptive observer is designed to eliminate these adverse effects. In the proposed compensation scheme, adaptive gains are designed to ensure effective compensation performance at different speeds. In addition, the proposed compensation scheme is decoupled from vector control and has a relatively small impact on the control performance of the motor. Finally, extensive tests are conducted to validate the effectiveness of the proposed method.