US PATENT SUBCLASS 318 / 811
.~.~.~.~ Pluse width modulation or chopping

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  DF  .~.~.~ With voltage pulse time control {1}
811.~.~.~.~ Pluse width modulation or chopping

DEFINITION

Classification: 318/811

Pulse width modulation or chopping:

(under subclass 810) Subject matter wherein each positive and negative polarity portion of the applied waveforms comprises a plurality of pulses of variable width.