Patent ID: 9154070
Filing Date: 2015-10-06
Classification: H02P

Abstract:
1. A controller for controlling a three-phase AC motor, the controller comprising: a current sensor configured to detect a current flowing through one phase of the AC motor, the one phase being defined as a sensor phase; a current estimation section configured to calculate a current phase relative to an axis of the sensor phase based on a α-axis current and a β-axis current in a stationary coordinate system defined by a α-axis parallel to the axis of the sensor phase and a β-axis perpendicular to the axis of the sensor phase, the current estimation section configured to calculate an estimation value of a current flowing through another phase of the AC motor based on the current phase and the current detected by the current sensor, wherein the current estimation section calculates the α-axis current based on the current detected by the current sensor, and the current estimation section calculates the β-axis current based on the current detected by the current sensor and a command value for the current flowing through the other phase of the AC motor.