Motor controller for electric power steering system

摘要

A motor controller for an electric power steering system which performs a steering assist operation by applying a torque generated by an electric motor to a steering mechanism. The controller includes: a current command value setting circuit for setting a current command value indicative of an electric current to be applied to the electric motor; a d-q command value setting circuit for setting a d-axis current command value and a q-axis current command value in a d-q coordinate system on the basis of the current command value; and a voltage controlling circuit for controlling a voltage to be applied to the electric motor on the basis of the d-axis current command value and the q-axis current command value.