Position and speed estimation methods of SPMSMs using a hall effect sensor

This paper proposes a speed and position estimation methods by using a Hall effect sensor. The speed is estimated from the fluctuated current which can be observed on the control axis. The position is estimated from the estimated speed and is corrected from the pulse which is generated by the Hall effect sensor mounted on the machine. Although the speed control range is limitted since this method is based on the back EMF, the speed and the position can be estimated without any motor parameter is used. The prposed method is verified by the experiments which 120 W SPMSM is used for the tested machine, the currnet control and the speed control results including the controlable speed range are breifly explained.