Rotor position, speed and acceleration estimation for salient-pole AC machines at all speed and torque ranges

Abstract

In this paper, an optimized sensorless control strategy for interior permanent magnet synchronous machine is presented based on high frequency (HF) signal injection techniques. In this work the rotor position estimation error is extracted without going through the usually used high pass filter, leading to reduce the cost and the complexity of implementation. Moreover, a parameter independent tracking algorithm is proposed to estimate the rotor position based on sliding mode theory. The proposed tracking algorithm uses only the sign of the rotor position estimation error instead of the rotor itself. Simulation results are presented according to an electrical propulsion benchmark used in automotive applications.