A method of high efficiency control for IPMSM by disturbance observer

In this paper, we propose the method to realize high efficiency control for IPMSM (Interior Permanent Magnet Synchronous Motor). In this method, we pay attention to the torque equation. We realize high efficiency control by controlling the vector angle of stator current. As for the high efficiency control, we define the optimum angle as the stator current angle which makes the torque biggest against certain stator current value. The optimum angle is shown as the equation about the stator current value. In addition, we propose the methods to find real optimum angle for the real system by changing stator current angle around calculated optimum angle in the low frequency. Furthermore, we show the possibility of more efficiency method to find real optimum angle by using the disturbance observer. Proposed method is realized by uniting between motor drive control region and mechatronics control region. The proposed method is validated by simulation.