Patent ID: 7795766
Filing Date: 2010-09-14
Classification: B62D,H02K

Abstract:
1. A motor comprising: a stator portion including an armature; a rotor portion including a shaft concentric with a central axis, a rotor core having a substantially cylindrical shape arranged to surround the shaft, and a field magnet which is arranged at the rotor core and which, along with the armature, generates a torque centered about the central axis; a first bearing portion and a second bearing portion arranged at a corresponding axial side of the rotor core to rotatably support the shaft; a sensor, including a sensor magnet having a substantially annular plate shape and a first Hall element, arranged at an axial side of the armature to magnetically detect an angular position of the rotor core with respect to the stator portion; a housing arranged to accommodate therein the stator portion and the rotor portion; and a busbar unit arranged at an axial end of the armature to connect the armature to an external power source; wherein the busbar unit includes a busbar holder having a substantially annular shape or arc shape and made of an insulating material centered about the central axis; the housing includes: the lid portion includes a first concave portion and a second concave portion arranged on an upper surface of the lid portion; the first concave portion is arranged to accommodate the sensor magnet and the first Hall element therein; the sensor magnet is affixed to the shaft such that the sensor magnet is arranged substantially perpendicular to the central axis to overlap the busbar holder in a radial direction; the first Hall element is arranged to oppose a magnetized surface of the sensor magnet; the second concave portion is arranged to accommodate the first bearing portion; and the first concave portion and the second concave portion are arranged substantially inward of the busbar holder in the radial direction such that a circumferential surface the busbar holder is arranged to oppose the first concave portion and the second concave portion.