An electric power steering system according to the present invention comprises:
a sensor module including a steering torque sensor and a control circuit housed
therein; and a motor module including an electric motor and a motor driving circuit
housed therein. The sensor module and the motor module are physically separately
mounted in the electric power steering system. Since the sensor module and the
motor module are physically separated, these modules can separately be produced,
and the steering torque sensor and the electric motor can independently be adjusted.
