Patent ID: 8987962
Filing Date: 2015-03-24
Classification: H02K

Abstract:
1. A double-stator/double-rotor type motor comprising: an inner rotor including a first permanent magnet mounted on an outer circumferential surface of an inner back yoke; an outer rotor including a second permanent magnet mounted on an inner circumferential surface of an outer back yoke; and a stator unit that faces the first permanent magnet with a first air gap, to thereby rotate the inner rotor and faces the second permanent magnet with a second air gap, to thereby rotate the outer rotor, wherein the stator unit is placed between the inner rotor and the outer rotor; wherein the stator unit comprises: an inner stator that includes a plurality of inner T-shaped teeth protruded inwards from an annular inner body in opposition to the inner rotor, and an inner coil wound on the inner T-shaped teeth; an outer stator that includes a plurality of outer T-shaped teeth protruded outwards from an annular outer body in opposition to the outer rotor, and an outer coil wound on the outer T-shaped teeth; a nonmagnetic material disposed between the annular inner body of the inner stator and the annular outer body of the outer stator to create independent and separate magnetic circuits for each of the inner rotor and the outer rotor; stator supports that are composed of an inner stator support and an outer stator support, and that integrally combine the inner stator, the outer stator and the nonmagnetic material; an outer extension portion that extends outward from the outer stator support; and an inner extension portion that extends inwards from the inner stator support; wherein the stator supports, the outer extension portion and the inner extension portion are integrally combined as a single piece to form an annular cover covering the inner and outer rotors.