Patent ID: 7170256
Filing Date: 2007-01-30
Classification: H02P

Abstract:
1. A motor control device for controlling a synchronous motor having a permanent magnet comprising: a voltage measuring unit that measures a voltage supplied to a driving amplifier; a reactive current adjusting unit that adjusts a reactive current passed to the synchronous motor based on the measured voltage; wherein the voltage measuring unit measures an alternating current power supply voltage that is supplied to the driving amplifier, and the reactive current adjusting unit adjusts a reactive current that is passed to the synchronous motor based on the measured alternating current power supply voltage; and wherein the reactive current adjusting unit comprises: a base speed changing unit that changes a base speed at which a reactive current is started to be passed based on the measured voltage; and a speed difference calculating unit that calculates a speed difference between a motor actual speed and the base speed, wherein a reactive current command being generated on basis of the calculated speed difference.