Torque control of permanent magnet synchronous motor using flux vector

This paper proposes an improved predictive torque control based on stator flux vector. By investigating the relationship among torque, the reference of stator flux magnitude and the phase angle of the stator flux, the reference vector of stator flux is designed. The desired deadbeat voltage vector is calculated based on the time delay compensation, which relieves the big calculation effort of conventional deadbeat direct torque and flux control. The two voltage vectors that adjacent to the reference of stator voltage vector are the candidate voltage vectors for next control period. A cost function consisting of tracking error of stator flux vector is then designed and the optimal voltage vector and its duration are determined simultaneously. Experiment tests were carried out and the results validate the effectiveness of the proposed method.