Trw Automotive U.S. LLC

Magna E-car Systems of America, Inc.

Paul H Kahler

Kevin M McLaughlin

A control system for a multiphase electric motor includes inputs for a desired torque output of the motor, a measured torque output of the motor, a signal representative of optimal motor efficiency; a signal representative of a measured efficiency of the motor. The output is a two-dimensional DQ control voltage. A torque feedback control loop minimizes error between the desired and measured torque outputs by controlling an angle of the DQ control voltage, and a motor efficiency feedback control loop minimizes error between the optimal and measured motor efficiencies by controlling a magnitude of the DQ control voltage.

DQ vector control system providing stable, high efficiency operation of electric motor

A method for controlling an electric motor includes the step of determining multi-phase voltage demand values. The method also includes the steps of determining a star voltage (vstar) of the electric motor and determining multi-phase voltage output command values as a function of the star voltage (vstar) and the multi-phase voltage demand values. The method further includes the step of supplying multi-phase voltage to the electric motor in accordance with the multi-phase voltage output command values energize the electric motor.

Growing community of inventors

Shelby Township, MI, United States of America

Paul H Kahler