Torque-Ripple Minimization and Fast Dynamic Scheme for Torque Predictive Control of

This paper proposes a simple and effective method to reduce torque ripples for the torque predictive control (TPC) of permanent-magnet synchronous motors (PMSMs). The conven- tional TPC analyzes the relationship among the electrical torque, stator flux, and stator voltage using the magnitude of the stator volt- age vector of PMSMs to obtain the angle of the reference voltage vector and accurately control the torque. In addition, the stator- flux control uses the hysteresis method. However, the voltage vector that can be chosen in an inverter is limited because the conventional TPC fixes the magnitude of the reference voltage vector, and thus, a large torque ripple is generated in the low-speed region. The pro- posed TPC does not fix but varies the magnitude of the reference voltage vector using both the torque and flux error information. Therefore, it not only has the fast dynamic of a direct torque con- trol but also can reduce effectively the torque ripple. The proposed method is proven by the simulation and experimental results, and the proposed algorithm provides an excellent steady-state response and fast dynamics.