Liu, Xing; Yang, Hui; Cai, Shun; Asef, Pedram; Wang, Yunchong; Lin, Heyun; Yu, Feng; (2025) A Novel Robust MTPA Method for IPMSMs Based on Model-Free Predictive Current Control With Improved Dynamic Response. In: (Proceedings) Energy Conversion Congress & Expo Europe (ECCE Europe 2025). IEEE (In press).

Text Final_MPTA_PMSM.pdf - Accepted Version Access restricted to UCL open access staff until 8 March 2026. Download (1MB)

Abstract

The maximum torque per ampere (MTPA) trajectory of an interior permanent magnet synchronous motor (IPMSM) is directly associated with the machine parameters. Traditional robust MTPA methods, e.g., signal injection-based methods, are normally with unsatisfactory dynamic performance. Therefore, in this paper, a novel robust MTPA method with improved dynamic response is proposed, which is designed on the framework of ultra-local model (ULM) based finite-control-set model-free predictive current control (FCS-MFPCC). In the proposed method, the optimal angle of current vector is tracked adaptively by using integral operation of the derivative of torque. The stability and convergence are verified with Lyapunov stability theorem. Then, to solve the issue of dependence on parameters, a parameter identification scheme with low complexity is designed to estimate the dq-axis inductances and PM flux, where only currents/voltages data are involved. Furthermore, a simplified lumped disturbance observer is proposed. Finally, the proposed MTPA method is validated by simulations. The results confirm the superiorities of the proposed method in terms of both steady-state performance and dynamic response.

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