Patent ID: 7188702

Claim:
An electric power steering apparatus comprising: a first device for detection of steering torque of a steering line; a motor for exerting assist steering torque on the steering line; a motor drive unit for driving the motor; a second device for detection of a motor current running through the motor; and a control unit including a third device for determining a target current to be supplied to the motor based on at least a signal of steering torque delivered by the first device and means for generating a signal for motor drive based on at least a deviation between the target current and the motor current and for transmitting the signal for motor drive to the motor drive unit, said target current being based on a compensation current being added to a command current where the command current is determined based on a function of the steering torque and where the compensation current is based on a function of the motor current and not based on a deviation of the target current and motor current, wherein the signal generating means also comprises means for weakening a magnetic field within the motor according to the motor current.