US PATENT SUBCLASS 310 / 212
.~.~.~.~.~ Inherently variable impedance (double squirrel cage)

Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

10  DF  DYNAMOELECTRIC {5}
40 R  DF  .~ Rotary {28}
179  DF  .~.~ Windings and core structure {7}
210  DF  .~.~.~ Secondary windings or conductors {1}
211  DF  .~.~.~.~ Squirrel cage {1}
212.~.~.~.~.~ Inherently variable impedance (double squirrel cage)

DEFINITION

Classification: 310/212

(under subclass 211) Subject matter having inherently variable impedance at variable frequencies.

(1) Note. This subclass relates, for example, to squirrel cage rotors in which the rotor bars are in the form of ribbons, set in deep slots so that the inductive reactance of the different portions of a ribbon are different. This subclass also relates, for example, to double squirrel cage type rotors.