Patent ID: 7557486
Filing Date: 2009-07-07
Classification: D06F,H02K

Abstract:
1. A dual rotor type motor comprising: a shaft rotatably provided in a motor securing part; a rotor assembly rotated with a center thereof fastened to the shaft, the rotor assembly comprising an outer rotor spaced from the center of the shaft a predetermined distance with magnets secured along a circumferential direction, and an inner rotor provided in an inside of the outer rotor at a predetermined distance with magnets secured along a circumferential direction; and a stator comprising a core made of metal, an insulator of an insulating material for surrounding the core so as to expose a first surface and a second surface of the core a coil wound on an outer surface of the insulator, and a fixing part for securing the insulator to the motor securing part, the stator provided between the outer rotor and the inner rotor so that the exposed first and second surfaces of the core are spaced from and face the magnets of the outer and inner rotors respectively, wherein the core comprises: an outer core comprising a plurality of teeth extending in a radius direction, each of the teeth of the outer core including a first surface facing a respective one of the magnets of the outer rotor, and a base for connecting the teeth of the outer core to one another, and an inner core comprising a plurality of teeth extending in a radius direction, each of the teeth of the inner core including a second surface facing a respective one of the magnets of the inner rotor, and a base for connecting the teeth of the inner core to one another.