Patent ID: 6819020
Filing Date: 2004-11-16
Classification: B60T,F04B,H02K

Abstract:
A compact electric motor comprising a rotor having a generally circular iron core with a plurality of slots, a winding wound and accommodated in the slots, an output shaft extending axially through a center of the iron core and fixed thereto, and a commutator fixed on the output shaft and to which opposite ends of the winding are electrically connected; a casing (yoke) of a generally close-ended hollow cylindrical shape rotatably accommodating the rotor and having a plurality of permanent magnets fixed to an inner peripheral surface thereof; a bearing for rotatably supporting the output shaft; a bracket mounted to close an opening end of the casing with the output shaft penetrating through the bracket, and provided with a housing for accommodating the bearing; a brush slidingly engaged with the commutator; a brush holder disposed inside the bracket and and accommodating the brush, characterized in that the bracket is provided with:a wall extending between the commutator and the bearing and having a predetermined gap around the shaft; a recessed portion formed at a portion of periphery of the housing and hollowing inward in the casing; a depleted portion formed by depicting a portion of the housing so as to allow a space between the bearing accommodated in the housing and the wall to be in communication with a recessed portion.