US PATENT SUBCLASS 318 / 807
.~.~ Frequency control

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

727  DF  INDUCTION MOTOR SYSTEMS {12}
767  DF  .~ Primary circuit control {9}
807.~.~ Frequency control {3}
808  DF  .~.~.~> With voltage magnitude control
809  DF  .~.~.~> With voltage phase angle control
810  DF  .~.~.~> With voltage pulse time control {1}

DEFINITION

Classification: 318/807

Frequency control:

(under subclass 767) Subject matter wherein the circuit connected to the primary member of the motor includes means to regulate the frequency of the current or voltage supplied to the primary member.

(1) Note. Regulation used here means to adjust or fix the rate of the cyclic current or voltage delivered to the primary winding of the motor, and includes control of the frequency to deliver a constant frequency or a variable frequency to the primary winding of the motor.