Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1993-03-10
2000-01-25
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318806, 318807, 318811, 318432, H02P 540
Patent
active
060182245
ABSTRACT:
A feedback circuit prevents clipping of the inverter drive signals for a polyphase induction motor. The circuit senses the electromotive force (e.m.f.) of the motor and regulates the slip frequency as a function of the difference between the sensed motor e.m.f. and the DC power supply voltage. When the motor e.m.f. approaches the supply voltage, a voltage controlled oscillator adjusts the slip frequency to reduce the motor e.m.f. and thereby ensure that the motor drive waveforms are not distorted.
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AC Propulsion, Inc.
Ip Paul
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