Motor control system and method for environmentally-friendly vehicle

摘要

A motor control system and method are provided for a vehicle that reduces torque ripples due to motor system characteristics while the vehicle is running at ultra-low speed in an electric vehicle running mode. The system includes a current command generator that generates a current command based on a torque command, a motor speed, and a reference voltage. A current controller generates a voltage command based on the current command. A coordinate transformer transforms the voltage command into a 3-phase voltage command by a coordinate transformation and a PWM (pulse width modulation) signal generator generates a switch signal based on the 3-phase voltage command. A PWM inverter generates a 3-phase driving current to drive a motor based on the switch signal and a current control ripple compensator applies a reverse phase harmonic wave to the current controller to reduce a harmonic wave caused by errors generated from the current controller.

主权项

1. A motor control system for a vehicle, comprising:
a current command generator configured to generate a current command based on a torque command, a motor speed, and a reference voltage; a current controller configured to generate a voltage command based on the current command; a coordinate transformer configured to transform the voltage command into a 3-phase voltage command by a coordinate transformation; a pulse width modulation (PWM) signal generator configured to generate a switch signal based on the 3-phase voltage command; a PWM inverter configured to generate a 3-phase driving current to drive a motor based on the switch signal; and a current control ripple compensator configured to apply a reverse phase harmonic wave to the current controller to reduce a harmonic wave caused by errors that are generated from the current controller, wherein the harmonic wave caused by errors that are generated from the current controller is a 6th harmonic wave, wherein the current control ripple compensator is configured to use a response surface method(RSM) based on a predetermined test, and wherein independent variables for the response surface method (RSM) are torque command, a motor speed, and a reference voltage, and a dependent variable is a current ripple to be measured.