Brushless direct-current motor of radial core type having a structure of double rotors and method for making the same

A brushless direct-current (BLDC) motor having a radial core type double rotor structure, the BLDC motor comprising:

• a rotational shaft which is rotatably mounted in a housing of an apparatus;
• 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 in annular form on different concentric circumferences in each rotor, and opposing magnets with a predetermined distance between the inner and outer rotors are disposed to have opposite polarities;
• and an integrated stator fixed to the housing of the motor, in which a plurality of stator core assemblies are temporarily assembled to an annular core support plate enabling automatic positioning and then are integrally formed into a single body in annular form via an insert molding using thermosetting resin, 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 includes 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.