Method for stabilizing AC induction motor having an open loop inverter
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United States of America Patent
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-
Nov 2, 1999
Grant Date -
N/A
app pub date -
Nov 17, 1998
filing date -
Nov 17, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for minimizing motor instability under no load conditions, the method including identifying instability by comparing consecutive current half cycle periods and, where the difference between half cycle periods is sufficiently large, determining that instability exists and modifying controller modulating waveforms by reducing waveform magnitude until stability is achieved. Preferably the apparatus for achieving stability includes only a single current zero crossing sensor to minimize hardware costs.
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