Stepper motor drive apparatus
CA 1112717 A · Owner: Valeron Corporation (The) · Inventors: Slicker, James M.; Beer, Larry D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus is disclosed for converting input step and direction commands from an external control source into stator winding drive current signals for a permanent magnet stepper motor. A translator circuit, having inputs coupled to the external control generates, sequential stator winding pulse enabling signals for transmission to a chopper-controlled power drive circuit. The chopper control features the sharing of a single chopper power switch by pairs of stator windings. The power drive circuit provides a winding current path to a reverse voltage supply upon initiation of winding current turn-off to enhance switching speed. A dual level current reference is generated in a current regulator …
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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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 1998.
- 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.