Patent ID: 6744157
Filing Date: 2004-06-01
Classification: H02K

Abstract:
An outer rotor induction motor, comprising:a driving shaft; a stator core fixed to a frame and having a plurality of stator slots so that the driving shaft penetrates a center of the stator core; a coil wound in the stator slots so as to form a rotating magnetic field; a rotor housing installed outside the stator core so as to maintain a predetermined air gap with the stator core wherein the driving shaft is coupled to the rotor housing through a bottom center of the rotor housing; a rotor conductor coupled with an inner circumference face of the rotor housing so as to generate a torque through interaction with the rotating magnetic field of the coil; a plurality of upper blades installed at an upper end of the rotor housing so as to leave a predetermined interval between the upper blades, wherein external air is forcibly sucked in to cool the coil when the rotor housing revolves; a plurality of first ventilating openings formed at a bottom of the rotor housing; and a plurality of lower blades formed on the rotor housing along side edges of a plurality of the first ventilating openings, whereby external air is forcibly sucked in through the first ventilating openings when the rotor housing revolves.