Direct Torque Control for Dual Y Shift 30 Degree Permanent-magnet Synchronous Motor Based on Fuzzy Logic and Rebuilding Voltage Vector

Mathematical model and direct torque control (DTC) strategy for dual Y shift 30 degree permanent-magnet synchronous motor were elaborated. Considering the problem of torque ripples and harmonic currents with k=6m±1 (m=1,3,5...),a novel direct torque control strategy, which based on fuzzy logic and rebuilding voltage vector, was proposed for dual Y shift 30 degree PMSM. Firstly, pulse width modulation was utilized to rebuild voltage vector in order to reduce the influence of k=6m±1(m=1,3,5...) harmonic currents on z1−z2 plane. Secondly, the different rebuilding voltage vector had the effect on the stator flux linkage and torque. In order to take full advantage of the impact, this paper presented voltage vector choice controller, which based on fuzzy logic, instead of the hysteresis controllers and the switching table. Simulation and experimental results demonstrated the effectiveness and feasibility of the proposed method.