MOTOR CONTROL APPARATUS, MOTOR SYSTEM AND MOTOR CONTROL PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a motor control apparatus capable of highly accurately detecting an initial magnetic pole position of a rotor even in a state of position sensorless.SOLUTION: A d-axis voltage command is converted into rectified waves of three phases on the basis of a pseudo rotation signal obtained by equally dividing one period of an electrical angle by the desired number of phases, PWM control is performed on the basis of the rectified waves, and ON/OFF time of a gate circuit section 1 in the PWM control is controlled to time which is equal in each phase period and in which a motor may not be started. Then response currents of at least two phases flowing from the gate circuit section 1 to the motor are detected at predetermined timing, the response currents are converted into fixed axis currents of αβ axes, a size of a vector from an origin of phase coordinates of each plot indicating the fixed axis current in each electrical angle phase is specified, and control for estimating a direction of a maximum vector as a magnetic pole direction of the rotor and estimating a rotation angle position corresponding to a reverse direction of the maximum vector as an initial magnetic pole position of the rotor is performed.SELECTED DRAWING: Figure 1