Electric power steering apparatus

摘要

An electric power steering apparatus in which the steering force of a steering wheel is assisted by an electric motor is disclosed. The number of revolution of the electric motor is detected, and the counter electromotive force of the electric motor is calculated on the basis of the detected number of revolution. A voltage which is to be applied to the electric motor and corresponds to the driving current instruction value determined in accordance with the steering torque is corrected on the basis of the calculated counter electromotive force. In the electric power steering apparatus, the period of the detection of the number of revolution of the electric motor is made longer than the period of the feedback control of the driving current of the electric motor, and the period of the feedback control of the driving current of the electric motor is synchronized with the period of the correction of the voltage to be applied.