Patent attributes
A motor includes a housing having a substantially cylindrical shape accommodating therein a stator portion and a rotor portion. The housing includes a housing body having an opening at an upper side thereof, and a lid portion arranged between an armature and a sensor so as to close the opening of the housing body. Since the lid portion is made of a magnetic material and is arranged between the armature and the sensor, a magnetic effect on the sensor caused by a magnetic force generated at the armature is minimized. By virtue of such configuration in which the lid portion of the housing functions as a magnetic shield, the motor can be smaller in the axial direction compared with a configuration in which an extra layer of magnetic shield is arranged.
