Motor control method and apparatus therefor
CA 1264802 C · Owner: Iizawa, Ryuji · Inventors: Iizawa, Ryuji; Murakami, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention discloses a technique for preventing obstacles from being caught in a power window by detecting the overload of the driving motor and suspending or reversely controlling the rotation of the motor in the motor control system. A reference value for detecting the overload is updated in accordance with the actual motor load in every predetermined time interval .DELTA.T but in the present invention when the start of increase of load is detected, the counting of .DELTA.T is restarted from such timing and thereby detection of overload is always carried out within the shortest period. Moreover, a variety of check mechanisms are provided for ensuring fail-safe function and for …
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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 January 23, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 2007.
- 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.