Method and apparatus for providing thermal protection for large motors based on accurate calculations of slip dependent rotor resistance
CA 1323398 C · Owner: Zocholl, Stanley E. · Inventors: Zocholl, Stanley E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A microprocessorized thermal protection system and accompanying method measures input voltage and current of an induction motor and derives therefrom continuously updated estimates of the slip dependent rotor resistance during acceleration of the motor. The measurements and calculations of the varying rotor resistance enable determination of the heat generated within the motor based on a thermal model thereof. Phase shift distortions induced by the measurement system are accounted for by determining the value of the stator resistance at start up. In addition during, a brief period following start up sampling of the, voltage/current inputs is suspended to avoid the effects of the initially …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted October 19, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 19, 2010.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.