Patent ID: 7913805

Claim:
An electric power steering apparatus, comprising: a motor that is operable to transmit an assist force corresponding to a steering torque transmitted to a steering system of a vehicle, to the steering system; a torque detector that detects the steering torque; a rotational angle detector that detects a motor rotational angle of a motor shaft of the motor; a current value detector that detects a motor current value that is a value of a motor current that is supplied to the motor; a correction amount setting unit that sets a rotational angle correction amount that is used to correct the motor rotational angle; and a controller that controls driving of the motor based on the steering torque, the rotational angle correction amount and the motor rotational angle, wherein the rotational angle detector detects a rotational angle of the motor shaft at a portion on a steering system side, as the motor rotational angle, and the correction amount setting unit sets a base correction amount based on the motor current value.