Method for determining the short-circuit inductance of an asynchronous machine
CA 2126756 C · Owner: Abb Industry Oy · Inventors: Heikkila, Samuli
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of determining a short-circuit inductance in an asynchronous machine. To enable the determination of the snort-circuit inductance even during the operation of the machine, the method comprises the steps of causing a step change in the stator voltage (u s); measuring both the stator voltage (u s) and the stator current derivative (~~) both before and after said step change in the stator voltage; determining the difference between the measured stator voltages (u s(t ~) (u s(t ~)) and the difference between the measured stator current derivatives (i s,(t~), (~ s(t ~)); and determining the quotient of the difference between the stator voltages and the …
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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 December 21, 1992 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2014.
- 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.