Method of determining speed of rotation of a motor and a computer software product to carry out the method
CA 2402441 A1 · Owner: Abb Research Ltd. · Inventors: Orkisz, Michal; Saarinen, Kari
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of determining speed of rotation of a motor (1). The method involves collecting samples (xn) with a measuring sensor (2) at a sampling frequency (fs) set on the basis of mechanical vibration of the motor (1), for the duration of a measurement period (T) and storing the samples (xn) in the memory of a data carrier (4) as measurement data of a fixed format. The speed of rotation of the motor (1) is determined from the measurement data by determining the cycle length of a periodic vibration signal in the time domain by means of a maximum likelihood estimate calculated by maximizing a maximum likehood funtion (J) adjusted to the measurement …
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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 19, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2023.
- 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.