Control system for excitation of synchronous machine
CA 2038424 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Murakami, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An excitation control system (200) for a synchronous machine and configured from automatic voltage regulators (6a, 6b, 6c) that output control signals (CA CB, CC) so as to regulate a terminal voltage of a synchronous machine (1), phase controllers (8a 8b, 8c), that output phase signals (PA PB, PC) so as to control, the phase of an arc pulse (PL) of a thyristor rectifier that supplies a field current to a field winding (2) of the synchronous machine (1), intermediate pulse selectors (14) provided with three pairs of pulse outputters (11a 11b, 11c) that output the arc pulses (PL) on the basis of the phase signals (PA, PB, PC) and which are provided between aforementioned three pairs of pulse …
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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 March 15, 1991 and granted July 12, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2013.
- 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
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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.