Robust Position Sensorless Control of IPMSMs for Inductance Variation Using Unknown Input Observer

Abstract

This paper proposes a new robust position sensorless control of interior permanent magnet synchronous motors (IPMSMs) for inductance variation using an unknown input observer. In position sensorless control of IPMSMs, accurate motor parameters are required for position estimation. However, inductance variation due to magnetic saturation is known to heavily deteriorate the performance of sensorless control. The authors have already proposed the unknown input observer for position sensorless control of IPMSMs. This paper shows that the proposed observer possesses high robustness for magnetic saturation by analyses and experiments.