Patent ID: 8384257
Filing Date: 2013-02-26
Classification: H02K

Abstract:
1. A brushless motor comprising: an external stator where a magnetic circuit is formed by winding electric wires around an iron core which is insulated; an external case disposed outside of the external stator and fixing a position of the external stator; a bus bar bundling the electric wires and forming an external input terminal; an internal rotor where a permanent magnet is integrated with a rotating shaft; a first bearing and a second bearing rotatably supporting both ends of the internal rotor with respect to the external stator; a housing holding the first bearing and secured integrally to the external case; an insulation plate being held on one end of the external stator; and a magnetic pole sensor detecting a magnetic pole of the permanent magnet being attached to the insulation plate, wherein the magnetic pole sensor is attached to the permanent magnet side surface of the insulation plate that faces the permanent magnet along an axial direction of the rotating shaft; the second bearing is attached to an opposite side surface to the permanent magnet side surface of the insulation plate; and the bus bar pushes the second bearing toward the insulation plate to attach the second bearing to the insulation plate.