| 摘要 |
A brushless doubly-fed induction machine comprising dual cage rotors, suitable for use in generator applications requiring a fixed-frequency electrical output that is independent of a rotational speed at which the machine is driven or motor applications requiring limited variable speed operation when connected to an AC mains. Various embodiments are disclosed, but each includes a stator frame in which first and second annular stators are mounted spaced-apart, end-to-end along a common axis. Each annular stator includes a core wound with polyphase distributed windings defining a plurality of poles. First and second rotors, mounted on a common shaft, are disposed within the first and second annular stators, respectively. Each of the rotors includes a laminated core having a plurality of longitudinally-extending slots defined around a periphery thereof, and at least one conductor is disposed in each slot. Each of the conductors for a given rotor is electrically connected to an end ring disposed at one end of the laminated core for that rotor. The rotor conductors in the first and second rotors are connected to each other, in a reverse phase sequence, through a plurality of interconnection conductors that are disposed between the rotors. The interconnection conductors are preferably of substantially equal length and resistance, and are configured in a pair of concentric layers. Each interconnection conductor occupies one of the concentric layers over its entire length, or one layer over a part of its length and the other layer over a remainder of its length.
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