Patent ID: 6707188
Filing Date: 2004-03-16
Classification: H02K

Abstract:
A motor comprising:a motor case; a rotatable shaft that is rotatably supported by said motor case and is rotated upon actuation of said motor; a worm shaft that is substantially coaxial with said rotatable shaft and is rotatably supported by said motor case; a coupling member including a driving-side rotator and a driven-side rotator that is drivingly engageable with said driving-side rotator, said driving-side rotator being connected to said rotatable shaft to rotate integrally therewith, said driven-side rotator being connected to said worm shaft to rotate integrally therewith; and a rotational sensor that includes a sensor magnet and a sensing element, said sensor magnet rotating integrally with said rotatable shaft, said sensing element measuring a rotational speed of said sensor magnet, wherein: said sensor magnet is secured to said driving-side rotator to rotate integrally therewith; said sensing element is secured to said motor case in such a manner that said sensing element opposes said sensor magnet; and said coupling member transmits rotation of said rotatable shaft to said worm shaft and prevents transmission of rotation of said worm shaft to said rotatable shaft.