Two vectors based model predictive torque control of dual three phase permanent magnet synchronous motor

The conventional direct torque control of dual three phase permanent magnet synchronous motor only employs the outermost voltage vector of the αβ sub-plane, which leads to a large harmonic current, and the direct torque control has the inherent problems of large flux and torque fluctuation. A two voltage vectors model predictive torque control strategy was proposed. The selection range of voltage vector is expanded. According to the characteristics of the sub-peripheral vectors and the outermost vectors in the direction of z1z2 sub-plane, the sub-peripheral vectors was added. By allocating the two groups of vector action time, the voltage amplitude of harmonic sub-plane is zero, and harmonic current suppression can be realized. The system calculation is reduced, and 12 predicted voltage vectors are reduced to 4 according to the position of stator flux. Furthermore, the torque value and flux value of the next time were estimated by using the prediction model. The optimal group of voltage vectors was selected online by using the value function, which makes the selected voltage vector more accurate and effective. The proposed method can suppress harmonic current and reduce torque and flux fluctuation. Feasibility and effectiveness of the algorithm were verified by simulation and experiment. © 2022 Editorial Department of Electric Machines and Control. All rights reserved.