Motor controller with detection of defects in the motor power supply line or in a power element of the motor power conversion device

摘要

A motor control apparatus for driving a three-phase motor based on a current command, comprising: a current command calculating unit (1) configured to calculate the value of a current command for driving the motor; a current detecting unit (2) arranged to adjust the magnitude a current deviation calculating unit (3) arranged to calculate a current deviation as a difference between the current command value and the detected current magnitude; a voltage command calculating unit (6) arranged based on the current deviation Calculating a magnitude of a command voltage applied to the motor; a voltage command saturation determining unit (7) configured to determine whether or not the voltage command value has reached a saturation state and to output the result as a voltage command saturation determination resu A filtering processing unit (4) arranged to calculate data obtained by filtering the current deviation, the absolute value of the current deviation or the power deviation, to compensate for a delay occurring in the current control loop or to remove noise superimposed on the current value, and arranged to output index data for detecting a defect of the supply line; and a supply line defect detecting unit (5) arranged to detect a supply line failure based on the index data only when it is determined that the voltage command value is not saturated, in accordance with the voltage command value saturation determination result.