Patent ID: 7443074

Claim:
An apparatus for driving a drum of a washing machine: a housing; a rotational shaft wherein a front portion is connected to the drum and its intermediate portion is rotatably mounted in the housing; double rotors including an inner rotor and an outer rotor in which a central portion of the inner rotor and the outer rotor is combined with the rotational shaft via a bushing and is rotatably supported, a plurality of N-pole and S-pole magnets are disposed alternately on inner and outer sides of opposing front portions in a first yoke frame whose inner end is connected to the bushing and a first bent portion of the other end is perpendicularly bent to form a cup shape and a second yoke frame which is integrally combined with the first yoke frame, and whose inner end is connected to the bushing and a second bent portion of the other end is perpendicularly bent to maintain a predetermined distance with respect to the first bent portion of the first yoke frame, and opposing magnets between the inner and outer rotors are disposed to have opposite polarities; and an integrated stator fixed to the housing of the washing machine, in which a plurality of stator core assemblies are temporarily assembled to an annular core support plate by an automatic positioning and supporting unit which automatically positions and supports the number of stator core assemblies to the core support plate with the predetermined interval, then the number of assembled stator core assemblies are insert-molded using an thermosetting resin to integrally form a stator support into a single body in annular form, and a mutually same air gap is formed between the inner and outer rotors, each of said stator core assemblies being wound by coil around a bobbin which is formed on each of a plurality of division type stator cores, wherein a magnetic circuit is formed via the magnets disposed in opposite polarities in the inner and outer rotors and the division type stator cores positioned between the inner rotor and the outer rotor.