Motor control and power systems and methods of operation thereof
CA 1288466 C · Owner: Bhagwat, Pradeep M. · Inventors: Walter, Richard T.; Bhagwat, Pradeep M.; Gilmore, Alan A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pulsating D.C. voltage is developed by a rectifier 86 and is filtered by a capacitor 100 to facilitate application of a relatively smooth enhanced D.C. voltage to a motor 106. The charged voltage of capacitor 100 is applied across a series circuit which includes a rheostat 118 a resistor 126 and motor 106. When the CEMF of motor 106 drops as a result of a decrease in motor speed a, diac 122 is biased through the voltage appearing across rheostat 118 and resistor 126 to cause an SCR 116 to fire. When SCR 116 fires, the voltage of capacitor 100 supplies a boost of power to motor 106 to overcome the decrease in motor speed. A circuit 212 prevents an overspeed of motor 106 from occurring …
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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 September 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 3, 2008.
- 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.