System and method for increasing the efficiency of alternating current induction motors
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United States of America Patent
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-
Mar 3, 1998
Grant Date -
N/A
app pub date -
Aug 23, 1996
filing date -
Aug 23, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for increasing the efficiency of single and multi-phase induction motors. The system is comprised of a microcontroller which combines a time when the AC line current reaches zero amps with a time when AC line voltage to the AC motor reaches zero volts and with a digital measurement provided by an A/D converter to determine a servo error. The servo error determines whether the A/C motor needs more or less power. The microprocessor provides a control signal to a switching means to supply the minimum power required based on the servo error.
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