Patent ID: 8310187
Filing Date: 2012-11-13
Classification: H02P

Abstract:
1. A motor drive device comprising: a drive unit for driving a motor based on an ON/OF operation of a switching element by a PWM (Pulse Width Modulation) signal; a current detection unit for detecting a current value of current flowing to the drive unit at a predetermined current detection timing, and obtaining an actual measurement current value of current flowing to each of phases of the motor; an application voltage generation unit for obtaining an application voltage value of the motor based on the actual measurement current value obtained by the current detection unit and a current command value indicating a target value of the current to be flowed to the motor inputted from outside; a PWM signal generation unit for generating the PWM signal and outputting to the drive unit based on the application voltage value obtained by the application voltage generation unit; and an abnormality detection unit for detecting abnormality from the application voltage value of each of the phases and the actual measurement current value of each of the phases; wherein the abnormality detection unit includes: