Development and testing of the torque control for the permanent-magnet synchronous motor

The purpose of this study is to develop a control method that increases the torque and the efficiency at all rotor speeds more than the ordinary current error feedback method. The method is composed of two compensators is proposed to achieve this purpose. One of the compensator controls the torque using the phase of voltages. Another one is the ordinary current error feedback. The validity of the proposed method is confirmed in the simulation and experiment examinations.