Patent ID: 7911110

Claim:
A double rotor type motor, comprising: an outer rotor, comprising: a first base; a first extension that extends from a circumference of the first base, substantially perpendicular thereto; and outer magnets mounted on an inner circumferential surface of the first extension; an inner rotor, comprising: a second base concentrically mounted on an upper surface of the first base; a second extension that extends from a circumference of the second base, substantially perpendicular thereto, so as to be positioned opposite the first extension such that a predetermined gap is formed between an inner side of the first extension and an outer side of the second extension; and inner magnets mounted on an outer circumferential surface of the second extension; a bushing installed at a center of the first base and the second base so as to transmit a rotation force from both the outer rotor and the inner rotor to a rotating shaft; and caulking hole portions that simultaneously align and join the first base and the second base while also maintaining a prescribed gap between the first base and the second base.