Patent ID: 6777897
Filing Date: 2004-08-17
Classification: B60L,H02P,Y02T

Abstract:
A motor control apparatus comprising:a sine wave voltage drive device that generates a sine wave AC voltage and applies the sine wave AC voltage to a motor; a rectangular wave voltage drive device that generates a rectangular wave AC voltage and applies the rectangular wave AC voltage to the motor; a speed detection device that detects a rotation speed of the motor; a control switching device that switches to either the sine wave voltage drive device or the rectangular wave voltage drive device based upon the motor rotation speed detected by the speed detection device and a motor torque command value; and an intermediate wave voltage drive device that generates an AC voltage forming an intermediate wave achieved by combining a sine wave and a rectangular wave and applies the intermediate wave AC voltage to the motor when a switch between the sine wave voltage drive device and the rectangular wave voltage drive device is effected by the control switching device.