Recently, many methods of sensor-less control of PMSM (Permanent Magnet Synchronous Motor) are proposed. One of the methods is based on an induced voltage estimation using a disturbance observer. Though this method has a simple structure and it is convenient to realize the system, it has some disadvantages, for example, the estimation error occurs in a high speed operation area.
In this paper, we propose a new sensor-less control of a cylindrical type PMSM based on the estimation of the induced voltage. We combine the induced voltage with the flux linkage by integrating the induced voltage to estimate the motor angular speed.
As our proposed method does not need the induced voltage constant to estimate the motor speed, the estimation error is small even if the induced voltage constant is changed.
Finally, the effectiveness of the proposed method has been verified by experiments.