Pulse width modulation dc motor speed control
CA 1255378 A · Owner: Outboard Marine Corporation · Inventors: Gibour, Daniel W.; Dogadko, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric outboard motor includes a dc motor, battery terminal and a propeller. A MOSFET is connected to and controls operation of the motor. is An integrated circuit has an output connected to the gate of said MOSFET and is operative to produce a pulse train of variable width which is applied to the gate. A manually operable potentiometer is connected between a battery terminal and the input to the integrated circuit to vary the voltage applied to the input to cause the integrated circuit to modulate the pulse width of the pulse train whereby the duty cycle of the MOSFET is varied in accordance with the setting of the potentiometer and the speed and thrust of the motor are varied …
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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 June 6, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 6, 2006.
- 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.