Wound rotor motor control
CA 1283698 C · Owner: General Motors Of Canada Limited · Inventors: Carter, Robert Stanley Francis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A control for a wound rotor induction motor including shorting switches in a secondary resistance network comprises an input comparator with voltage limiting switched by the rotor voltage a pulse, generator responsive to the input comparator to generate voltage pulses of predetermined constant duration at a frequency proportional to the frequency of the rectangular voltage wave, a low pass filter effective to filter the output of the pulse generator to a DC voltage inversely related to rotor speed a DC, power supply effective to generate a plurality of DC reference voltages, a plurality of switch control comparators, each receiving the output of the low pass …
Read the whole patent
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
- Granted April 30, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 30, 2008.
- 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.