Motor and method for manufacturing same

A motor according to the present invention comprises: outer teeth on which a first coil is wound; a circular stator having a plurality of partitioned core assemblies spaced in the circumferential direction thereof, the core assemblies having inner teeth on which a second coil, which is connect to the first coil, is wound; a rotor support connected to a rotating shaft; an outer rotor, which is attached to the outside of the rotor support and positioned on the outside of the stator, and which forms a first magnetic circuit by interacting with the first coil; and a rotor, which is attached in the interior of the rotor support and arranged in the interior of the stator and provided with an inner rotor, and which forms a second magnetic circuit by interacting with the second coil. The present invention reduces the loss in magnetic force by reducing magnetic resistance, improves motor efficiency, reduces manufacturing costs, enhances ease of assembly, and minimizes noise and vibration.