Procedure for the regulation of an asynchronous motor
CA 2044220 C · Owner: Kahkipuro, Matti · Inventors: Kahkipuro, Matti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Procedure for regulating the stator flux and torque of an asynchronous motor by vector control in an imaginary space vector coordinate system in which, procedure the absolute value (??s?) of the stator flux and the torque (M) are determined in said coordinate system and in which procedure the calculation coordinates are in such a position that the rotor flux (?r) is at least close to the real axis. In the procedure of the invention the, absolute value of the stator flux (??s?) is regulated by means of the real part (usr) of the stator voltage and the torque (M) by means of the stator frequency (fs) The calculation coordinates are held in said position by adjusting the imaginary part (Usi) …
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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 June 7, 1991 and granted August 6, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 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.