Patent ID: 7847500
Filing Date: 2010-12-07
Classification: G11B,H02P

Abstract:
1. A synchronous motor control device comprising: a synchronous motor; an inverter applying a pulse-width-modulated voltage to the synchronous motor and driving the synchronous motor with a sinusoidal alternating current; a power source supplying power to the inverter; a current detector detecting a current supplied to the inverter; a current command generator generating a current command for the synchronous motor; and a controller adjusting a voltage outputted by the inverter based on a current detection value from the current detector and the current command from the current command generator, wherein a means of superimposing a pulsation component anticipated in advance to the current command is provided, wherein a means of superimposing a correction signal substantially having an average value of zero to the current command is provided, wherein a means of obtaining magnitude of the correction signal from a magnitude of the current command and setting the magnitude of the correction signal is provided, wherein the correction signal is a periodic function changing at a frequency of six times with respect to an electrical angle driving frequency of the synchronous motor.