Single phase electronically commutated motor system and method
CA 2115854 A1 · Owner: General Electric Company · Inventors: Day, James; Erdman, David M.; Kliman, Gerald Burt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A dynamoelectric machine includes a rotor a direct, current bus, and only two power transistors connected in series across the bus. A winding is connected at one end between the switches and is connected at the other end at a center-tap of two power capacitors connected in series across the bus. The position of the rotor is sensed by a Hall device and the speed or torque of the motor is controlled by selectively gating the switches to apply current through the winding so that the windings generate a magnetic field for rotating the rotor at a desired speed or torque. A voltage doubler Cuk dc/dc, converter, or other regulating device may be used to power the motor. …
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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 February 17, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 17, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2016.
- 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.