Process for the suppression of current peaks during commutation of a brushless direct-current motor
CA 2038846 C · Owner: Seeberger, Jurgen · Inventors: Seeberger, Jurgen; Meyer, Helmut; Albrecht, Kai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
With so-called single-current measurement in the directcurrent link of a brushless direct-current motor there, is the problem that current peaks occur in the phase windings during commutation, said current peaks not being detected by single-current measurement in the direct-current link. Consequently, current regulation during commutation is based on an incorrect actual value of the current. The object of the present invention is to propose a process that, firstly, measures the motor current in low-cost manner by means of single-current measurement in the direct-current link and, secondly suppresses the, current peaks that occur during commutation. The object of the invention is achieved in …
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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 22, 1991 and granted May 6, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 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.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.