Influence of dead-time compensation on rotor position estimation in surface mounted PM machines using HF voltage injection

Abstract

This paper addresses the problem of rotor position estimation in a surface mounted permanent magnet (SMPM) machine using HF rotating voltage vector injection. The low saliency of these machines causes a relatively low magnitude of the modulated signals carrying the position information and engineering factors affect the resulting accuracy of the position angle estimate. The paper shows that the dominant effect is that of the inverter's dead time. The paper reviews and implements state-of the-art dead time compensations methods to enhance the accuracy of the position estimate. Experimental results show the numerical improvement in positional accuracy and prove the necessity of using good compensation methods for position estimation in low saliency machines.