Synchronous motor speed controller for IC engine turbocharger has coil switched live when integral value of counter-electric force equals specific value, and unit correcting voltage at ends of coil to eliminate influence of reflux current

摘要

The control system has a control unit changing commutation unit state so that coil, which is not live, is switched live when integral value of a counter-electric force equals integral value of neutral point potential. Detection unit detects tension at ends of coil when not live. Correction unit corrects voltage at ends so that reflux current influence is eliminated during period when reflux current crosses coil which is not live.