Patent ID: 6995679

Claim:
A steering device for generating auxiliary steering power by means of an oil pressure generated by a pump that is driven by an electric motor, the electric motor having a conduction angle during which electrical power is provided to at least one motor phase, the steering device comprising: a rotary angle detector that detects the rotary angle of the rotor of said electric motor, a steering angular speed sensor for detecting a steering angular speed of a steering operating member, a drive target value setting device that sets a drive target value of said electric motor based on an output of the steering angular speed sensor, a drive signal generator that generates a drive signal for driving said electric motor on the basis of the drive target value which is set by the drive target value setting device, and an angle setting device that sets a phase advance angle of said drive signal with respect to the rotary angle that is detected by said rotary angle detector in relation to the drive target value which is set by said drive target value setting device, thereby varying the conduction angle.