Method and apparatus for controlling an ac induction motor
CA 1164932 A · Owner: Jonsson, Ragnar · Inventors: Jonsson, Ragnar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for controlling an AC induction motor having, at least two phases. The motor is controlled in a known manner by two input signals S1, S2, which are connected to a resolver (1) the output, signals of which are used to generate separate supply signals to the motor phases. A measured signal U, representing the rotational speed of the motor, is fed back to the control system and is used for calculating the oscillator frequency of the oscillator (5) which drives the resolver. A calculating circuit calculates the oscillator frequency as the sum of the first control signal S1 multiplied by a first constant factor and, the tachometer signal U multiplied by a second constant …
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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
- Granted April 3, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 2001.
- 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.