CONTROL DEVICE FOR MULTI-PHASE AC MOTOR

摘要

A control device for controlling a multi-phase AC motor generating a steering assist torque in an electric power steering device of a vehicle, includes: first and second inverters in first and second systems that output first and second alternating current voltages to first and second multi-phase winding wire sets, respectively; and a control unit that controls a phase difference between the first and second alternating current voltages. The first and second multi-phase winding wire sets provide a stator of the motor, and generate a rotating magnetic field in a rotor. The control unit sets a control range including a reference phase difference, which reduces a specified-order harmonic component, and changes the phase difference within the control range according to a characteristic required of the motor, or so as to cause a fluctuation in the energization of the motor.

主权项

1. A control device for controlling energization of a multi-phase AC motor, which generates a steering assist torque in an electric power steering device of a vehicle, the control device comprising:
a first inverter in a first system that outputs a first alternating current voltage to a first multi-phase winding wire set; a second inverter in a second system that outputs a second alternating current voltage to a second multi-phase winding wire set; and a control unit that controls a phase difference between the first alternating current voltage applied to the first multi-phase winding wire set and the second alternating current voltage applied to the second multi-phase winding wire set, wherein the first inverter and the second inverter are electrically independent from each other, wherein the first multi-phase winding wire set and the second multi-phase winding wire set provide a stator of the multi-phase AC motor, and generate a rotating magnetic field in a rotor, and wherein the control unit sets a control range including a reference phase difference, which reduces a specified-order harmonic component, and wherein the control unit changes the phase difference within the control range according to a characteristic required of the multi-phase AC motor, or so as to cause a fluctuation in the energization of the multi-layer AC motor.