Patent ID: 7610133

Claim:
A controller for an electric power steering apparatus, comprising: a target value calculation element for calculating target values of drive currents of a brushless motor for generating steering assist power on a basis of at least a detected value of steering torque; a drive signal value calculation element for calculating drive signal values for driving said motor on a basis of the target values calculated by said target value calculation element, detected values of the drive currents of said motor, and a detected value of a rotary position of a rotor of said motor; and a driving element for driving said motor in accordance with said drive signal values, wherein: said target value calculation element is constituted by a first integrated circuit provided in a chip, said drive signal value calculation element is constituted by a second integrated circuit provided in another chip, said first integrated circuit is connected communicably to said second integrated circuit, and a drive signal calculation cycle of said drive signal values repeatedly executed by said second integrated circuit is set to be shorter than a target value calculation cycle of said target values repeatedly executed by said first integrated circuit.