Abstract
The maximum torque per ampere (MTPA) control has been widely employed to improve the efficiency of the permanent-magnet synchronous machine (PMSM) drive systems. To achieve accurate online MTPA tracking, in this work, a high-frequency current injection based method is proposed. Compared to the lookup-table based MTPA control, the proposed method can significantly reduce the pre-tuning effort. Since a high-frequency square-wave signal is injected, compared to the existing sinusoidal signal injection based MTPA control, the proposed method can eliminate the bandpass filter, which is usually used to extract the derivative of torque with respect to the current control angle, such that the bandwidth of the MTPA controller can be increased. In this work, the proposed MTPA tracking can be implemented by using either virtual or real signal injection. In addition, the effect brought by magnetic saturation is analyzed in this work and the corresponding solutions are presented to mitigate this effect. The feasibility and effectiveness of proposed methods are verified by both simulation and experimental studies.
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