Method and apparatus for preventing overheating in an electronically commutated motor assembly
CA 2576281 C · Owner: Shop Vac Corporation · Inventors: Robitaille, James M.; Norell, Neil, N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control circuit for a motor includes a voltage regulator having a thermal shutdown apparatus that turns off the voltage regulator when the temperature of the control circuit rises above a pre-determined threshold level wherein , the voltage regulator is used to provide power to a plurality of insulated gate bipolar transistors controlling a plurality of stator windings of the motor. Thus the voltage regulator prevents the control circuit and the various components on the control circuit from being damaged from overheating. An embodiment of the control circuit is adapted to generate an error code in response to the shutdown of the voltage regulator and to monitor the operation of …
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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
- Filed July 20, 2005 and granted June 19, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 20, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.