US PATENT SUBCLASS 318 / 713
.~.~.~ Responsive to slip voltage frequency in d.c. field winding

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

700  DF  SYNCHRONOUS MOTOR SYSTEMS {7}
705  DF  .~ Synchronization systems {4}
712  DF  .~.~ With field excitation application {3}
713.~.~.~ Responsive to slip voltage frequency in d.c. field winding

DEFINITION

Classification: 318/713

Responsive to slip voltage frequency in DC field winding:

(under subclass 712) Subject matter wherein the rotating magnetic field and the speed of the rotating motor induce an AC voltage in the field winding and which includes means responsive to the frequency of the induced voltage to control the switching means to apply the direct current power to the field winding.

SEE OR SEARCH THIS CLASS, SUBCLASS:

521+, for motor field or secondary circuit control generally.

717, for synchronous motor field excitation application circuits controlled by the frequency of the voltage induced in the field winding circuits.

827, for induction motor secondary circuit control responsive to the frequency of the secondary circuit.