US PATENT SUBCLASS 318 / 821
.~.~ Impedance control of secondary circuit

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

727  DF  INDUCTION MOTOR SYSTEMS {12}
818  DF  .~ Secondary circuit control {3}
821.~.~ Impedance control of secondary circuit {2}
822  DF  .~.~.~> Responsive to motor condition {4}
829  DF  .~.~.~> By manual operation

DEFINITION

Classification: 318/821

Impedance control of secondary circuit:

(under subclass 818) Subject matter wherein the circuit includes an electrical impedance element of the resistive, inductive, or the capacitive type to control the current in the secondary member of the motor.

(1) Note. Here the voltage induced in the secondary member by the primary member creates a current which is controlled by an impedance element forming part of the circuit.

(2) Note. Means to add, remove, or vary the secondary impedance element is included in this group of subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

533, and the subclasses specified in the notes thereto for miscellaneous motor systems having impedance devices in the field or secondary circuit of the motor.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems,

220, 354 for impedance voltage magnitude controlled systems. 336, Inductor Devices, appropriate subclasses for inductors, per se.

338, Electrical Resistors, appropriate subclasses for resistors, per se.

361, Electricity: Electrical Systems and Devices,

271, for capacitors, per se.