US PATENT SUBCLASS 318 / 78
.~.~.~.~ Controlling A.C. frequency or rate of electrical impulses to other motor

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

34  DF  PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22}
66  DF  .~ Running-speed control {4}
68  DF  .~.~ Relative motor speed control {5}
77  DF  .~.~.~ Controlling motor speed in response to speed of another motor {1}
78.~.~.~.~ Controlling A.C. frequency or rate of electrical impulses to other motor

DEFINITION

Classification: 318/78

(under subclass 77) Subject matter in which means are provided for controlling the speed of said other motor by controlling the frequency of alternating current supplied to said motor or by controlling the rate at which electrical impulses are supplied to said other motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

723+, for synchronous motor systems having frequency control of the supply current for the motors.

807+, for induction motor systems having frequency control of the supply of AC to the motor.