US PATENT SUBCLASS 318 / 810
.~.~.~ With voltage pulse time 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  DF  .~.~ Frequency control {3}
810.~.~.~ With voltage pulse time control {1}
811  DF  .~.~.~.~> Pluse width modulation or chopping


DEFINITION

Classification: 318/810

With voltage pulse time control:

(under subclass 807) Subject matter wherein the voltage waveforms applied to the primary member of the motor is a pulse waveform having alternating positive and negative polarity portions, and the means to regulate the frequency of the voltage includes means to regulate the time at which the pulses are started and ended.

(1) Note. Regulation includes the starting and ending of the pulses at a constant time or a variable time.