Patent ID: 6278211
Filing Date: 2001-08-21
Classification: H02K

Abstract:
An electrical polyphase brushless doubly-fed induction machine comprising:(a) a stator frame in which a first annular stator and a second annular stator are mounted in spaced apart relationship, end-to-end, along a common axis, each annular stator having an annular core wound with polyphase distributed windings defining a plurality of poles,(b) a rotary shaft that is rotatably mounted and extends centrally through said first and second annular stators, axially aligned with said common axis;(c) a first cage rotor and a second cage rotor mounted on the rotary shaft, said first cage rotor being disposed within said first annular stator and said second rotor being disposed within said second annular stator, each of said first and second rotors comprising a laminated core having a plurality of generally longitudinally-extending slots defined around a periphery thereof in each of which at least one conductor is disposed, all conductors for a given cage rotor being electrically connected to an end ring disposed at an end of the laminated core of that cage rotor; and(d) a plurality of interconnection conductors electrically connecting the conductors in the plurality of slots of first cage rotor to the conductors in the plurality of slots of the second cage rotor, in a reverse phase sequence.