Patent ID: 7723877
Filing Date: 2010-05-25
Classification: H02K

Abstract:
1. A motor having a shaft protruding from the motor in an axial direction, the motor comprising: a stator including a stator core formed of a plurality of teeth and an annular yoke coupling the teeth to each other, and a winding provided to the teeth; a rotor confronting the stator while rotatably supported, and including a rotor magnet, a rotor core and a position sensing magnet; a position sensor for sensing a rotational position of the rotor; and a circuit board for mounting the position sensor and supplying an electric current to the winding in response to the rotational position of the rotor, wherein the circuit board is spaced from the rotor core in the axial direction in which the shaft protrudes, the rotor core is shaped like a cup having an opening, the opening facing the circuit board, and the rotor magnet, the rotor core and the position sensing magnet are integrated into one unit, which is mounted on the shaft of the rotor so that the rotor magnet is disposed on a circumferential outer wall of the rotor core and the position sensing magnet is disposed on a circumferential inner wall of the rotor core.