Abstract
In order to minimize the torque ripple of SRM, a predictive direct torque control (PDTC) method is proposed in this paper. Firstly, a discrete predictive model is established by the accurate measurement the static electromagnetic characteristics of SRM. The future value of output torque of the SRM is predicted using this predictive model. Secondly, the torque sharing function is used to share the total torque reference to each phase. Then, the cost function of each phase is designed to simultaneously minimize the torque ripple and reduce switching frequency. Further, the optimal switching state of the minimum predefined cost function is selected to be output to the phase power converter. Compared with the conventional direct torque control method, the proposed PDTC method does not need to formulate complex hysteresis control rules, and can effectively suppress torque ripples. Finally, the validity of proposed control scheme is verified by the simulation results of a three-phase 12/8 pole SRM.
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