Abstract
This article presents an improvement in the dynamic performance of interior permanent magnet synchronous motor drives by using a feed-forward load torque compensator along with a proportional-integral speed controller. In such a case, the load torque estimator compensates the speed control by setting a feed-forward torque value through the q-axis current reference value, so that the machine speed can reach the reference speed very fast. The experimental and simulation results indicate that the proposed control technique improves the interior permanent magnet synchronous motor speed performance in terms of tracking precision and travel time. Moreover, the performance of an interior permanent magnet synchronous motor drive system using a conventional proportional-integral controller is compared with the proposed controller. The results show that the proposed proportional-integral controller with a feed-forward load torque compensator has achieved superior performance compared to those of the conventional one. An acceptable speed response under load torque variations and parameter uncertainty is found.