Motor driving system and method for controlling same

Abstract

A motor driving system includes an energy storage device storing direct current power for driving a motor, an inverter including a plurality of switching elements to transform the direct current power stored in the energy storage device into alternating current power and to provide the alternating current power to the motor, and a controller performing pulse width modulation control on the plurality of switching elements of the inverter. The controller generates a voltage command of the motor based on a difference between a current command of the motor and a motor current actually provided to the motor, changes the voltage command within an operation region when the generated voltage command deviates from a preset operation region, and performs flux weakening control for generating the current command such that a difference between the voltage command before the change and the voltage command after the change becomes minimum.