Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2007-07-03
2007-07-03
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S430000, C388S903000
Reexamination Certificate
active
11066690
ABSTRACT:
A startup failure detection system provides an indication of motor startup failure based on a flux amplitude signal value. The flux amplitude signal is derived from motor flux estimations in combination with a rotor angle estimation. The flux amplitude signal value is compared to an upper and lower threshold value, and a startup failure is indicated if the flux amplitude signal value is outside the range determined by the upper and lower threshold value. The motor drive system can be set to attempt a restart when a motor drive startup failure is detected, with the retrial current, duration and the total number of retrials being user selectable.
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International Rectifier Corporation
Ro Bentsu
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