An electric motor having an improved airflow cooling system
CA 2230596 C · Owner: Gierer, Joseph T. · Inventors: Cox, Karmen D.; Gierer, Joseph T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved design for a switched reluctance motor is disclosed that keeps the motor cool during operation and thereby improves the performance and reliability of the motor. The improved design employs three centrifugal fans mounted to the motor shaft which are used to create two independent airflow paths one of which cools the electronic, components of the motor. The improved design also divides the functions performed by a single printed circuit board into two circuit boards an upper circuit board and a lower, circuit board. Another feature of the improved design includes locating the position/speed sensing encoder immediately below one of the centrifugal cooling fans. The disclosed …
Read the whole patent
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 April 2, 1998 and granted January 15, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2020.
- 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.