Patent ID: 9007009
Filing Date: 2015-04-14
Classification: B60L,H02P,Y02T

Abstract:
1. A control apparatus for controlling a three-phase AC motor to which a voltage controlled by an inverter is applied, the control apparatus comprising: a current receiver configured to receive a current detection value from a current sensor provided to one of three phases of the AC motor; a rotation angle receiver configured to receive a rotation angle detection value from a rotation angle sensor that detects a rotation angle of the AC motor; a rotation speed calculator configured to calculate a rotation speed of the AC motor based on the rotation angle detection value; a current estimator configured to calculate a current estimation value based on the current detection value and the rotation angle detection value; a difference calculator configured to calculate a difference between a current command value related to driving of the AC motor and the feedback current estimation value; a first voltage command value calculator configured to calculate a first voltage command value based on the difference, the first voltage command value used to generate a drive signal related to driving of the inverter, and a difference reverser configured to reverse a sign of the difference at a reverse interval when the rotation speed is not greater than a first determination threshold.