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Conventional machine stator open-phase fault detection methods rely on the detection of current harmonics from the sensing of phase currents. Because the magnitudes of current harmonics are proportional to the machine load condition, it is a challenge for the phase fault detection at the light load condition when fault-induced current harmonics are too small to detect. This paper proposes an improved...
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...
This paper addresses design issues on a position sensorless drive for permanent magnet (PM) synchronous machines in the entire speed range. At initial state, the rotor magnetic polarity is identified based on the flux saturation through a square-wave voltage injection. For low speed operation, the spatial information in the saliency is tracked for the closed-loop sensorless drive. The square-wave...
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