Induction motor control apparatus and method for restart when rotating in shutdown
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United States of America Patent
Stats
-
Aug 4, 1987
Grant Date -
N/A
app pub date -
Oct 30, 1985
filing date -
Oct 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
AC induction motor energized by an inverter coupled with a DC power source. Upon shutdown of the inverter because of a fault condition or a rail gap between adjacent power sources, if the motor rotating frequency is greater than a minimum frequency then a decreased motor voltage is applied to the motor and increased as a ramp over a provided time delay period, after which the motor slip is controlled to provide a desired motor torque that is increased over a subsequent time delay period.
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