Patent ID: 6927548

Claim:
An electric power steering apparatus for giving steering assist force to a steering mechanism of a vehicle by driving an electric motor on the basis of a current target value that is determined in accordance with a manipulation for steering the vehicle, the electric power steering apparatus comprising: a rotation speed detecting unit which detects a rotation speed of the electric motor; a compensation current determining unit which determines an instruction value of a compensation current to flow through the electric motor to suppress torque ripples due to distortion of an induced electromotive force waveform of the electric motor in accordance with a load correspondence quantity as a physical quantity corresponding to a load of the electric motor and the rotation speed detected by the rotation speed detecting unit; a correcting unit which corrects the current target value on the basis of the compensation current instruction value determined by the compensation current determining unit; and a control unit which performs a feedback control on the electric motor so that a current having the current target value as corrected by the correcting unit flows through the electric motor, the control unit being part of a current control system of the electric motor that uses the feedback control.