Abstract
This paper proposes a permanent magnet (PM) machine position sensorless drive for high speed (>10-krpm) applications. A fully discretized back electromotive force (EMF) estimator is designed to overcome several high speed rotor position estimation issues, including the voltage error due to pulse-width-modulation (PWM), dq inductance cross-coupling effect and the deviation between the estimated EMF and actual EMF resulting from the digital implementation. To overcome these problems, an observer-based EMF estimator is proposed with two implementation considerations. They are i) a discretized dq current observer to minimize the inductance cross-coupling effect on the estimated EMF voltages, and ii) a PWM model considering the EMF cross-coupling effect to obtain actual EMF voltages. A high speed PM machine is experimentally tested to verify all proposed sensorless drive methods.
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