Patent ID: 9077273
Filing Date: 2015-07-07
Classification: H02P

Abstract:
1. A control device of a three phase alternating current motor comprising: an inverter for driving the motor; a current sensor for sensing current flowing in a sensor phase of the motor, which is one of three phases of the motor; and a controller for switching on and off a plurality of switching elements, which provide the inverter, so that the controller controls the current flowing through the motor, wherein an electric angle is defined as θe when one of the three phases is referred as a basis, wherein a phase is defined as φ when a dq axis is referred as a basis, wherein a phase angle of a current command vector is defined as (θe+φ+C), wherein C represents a constant, wherein, when the motor is stopped, the controller determines whether the current command vector is orthogonal to an axis of the sensor phase on three phase coordinates, and wherein, when the controller determines that the current command vector is orthogonal to the axis of the sensor phase, the controller operates the phase or the electric angle so as to perform a non-orthogonalization process for setting the current command vector not to be orthogonal to the axis of the sensor phase.