Patent ID: 6819026
Filing Date: 2004-11-16
Classification: H02K

Abstract:
An induction motor comprising:an outer stator serving as an outermost-diameter-portion stator and having outer windings and first grooves, an inner stator serving as an innermost-diameter-portion stator and having inner windings and second grooves, an a rotor situated between the outer stator and the inner stator to have radial air gaps to the outer stator and the inner stator and having squirrel-cage windings so that the rotor receives rotating magnetic fields from the outer and inner windings, wherein a number of the first grooves of the outer stator is equal to 2nÃ—(number of poles) (n: positive integer) and first main windings and first auxiliary windings are alternately applied to teeth between the first grooves of the outer stator, a number of the second grooves of the inner stator is equal to 2mÃ—(number of poles) (m: positive integer) and second main windings and second auxiliary windings same as those used for the outer stator are alternately applied to teeth between the second grooves of the inner stator, the first main windings of the outer stator and the second main windings of the inner stator are arranged so that magnetic fluxes in a same direction are generated, and connected in series so that the magnetic fluxes generated by adjacent main windings have directions opposite to each other, the first auxiliary windings of the outer stator and the second auxiliary windings of the inner stator are arranged so that magnetic fluxes in a same direction are generated, and connected in series so that the magnetic fluxes generated by adjacent auxiliary windings have directions opposite to each other, the first and second main windings of the outer and inner stators connected in series are used as main windings of a capacitor induction motor, and the first and second auxiliary windings of the outer and inner stators connected in series are used as auxiliary winding of the capacitor induction motor.