| Abstract |
In this paper, a sensorless position control of a salient-pole brushless DC motor is proposed. In the system, the position angle and the speed at a rotating condition are estimated basically by the model reference adaptive system (MRAS). At an initial or a starting condition, the position angle is estimated by a new AC current injection method. And at a lower speed region, the estimated position angle and the speed obtained from the MRAS are corrected by a new correcting technique. The position angles
and the speeds which were estimated values by the MRAS and the AC current injection method are compared and corrected effectively by the correcting system. The experimental results of the estimated position angles or the speed and the variable speed control with the experimental system are shown in
the paper. From these results, the proposed sensorless control system may be applicable to a sensorless
position control of the brushless DC motor drive system. |
