Electricity: motive power systems – Induction motor systems – Power-factor control
Patent
1980-06-20
1983-05-17
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Power-factor control
318798, 318809, H02P 540
Patent
active
043842437
ABSTRACT:
A multi-phase motor controller for controlling voltage and power expended by a multi-phase motor comprises a sensing stage for detecting power factor angle, a feedback amplifier stage for comparing the power factor angle with a desired power factor angle, and a control stage for controlling voltage and power expended by the multi-phase motor in accordance therewith. Other features of the motor controller include a current limiting circuit for limiting "in-rush" current during "start up" of the motor controller, a current trip circuit for implementing "instantaneous trip" and "timed trip" capabilities upon detection of corresponding "overload" conditions, and a phase-loss circuit for automatically disabling operation of the motor upon detection of "phase-loss". A further embodiment of the motor controller includes a lead network, connecting the feedback amplifier stage to the control stage, for enhancing the stability of operation of the motor controller.
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Smith Jr. David
Vectrol, Inc.
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