Patent ID: 6833644
Filing Date: 2004-12-21
Classification: A63B,H02K

Abstract:
An external rotor brush DC motor comprising:a shaft fixedly mounted on a bracket; a permanent magnet mounted on a middle part of said shaft and forming with said shaft a stator; a front wheel and a rear wheel mounted on said shaft with a respective axle bearing and spaded from said permanent magnet at front and rear sides, said front wheel having a belt pulley formed integral with the periphery thereof, said rear wheel having a through hole; a commutator provided at an outer side of said rear wheel for synchronous rotation with said rear wheel; a shell connected between said front wheel and said rear wheel for synchronous rotation; an iron core and a coil mounted in an inside wall of said shell and forming with said shell and said front wheel and said rear wheel a rotor, said coil having a lead wire inserted through the through hole of said rear wheel and electrically connected to said commutator; a cover affixed to said shaft and covered over said commutator; and a left-side electric brush and a right-side electric brush fixedly mounted inside said cover and respectively pressed on said commutator.