Pulse width modulation dc motor speed control

Details Pulse width modulation dc motor speed control Pulse width modulation dc motor speed control

H - Electricity

02

P

318/110, 342/34.

H02P 7/29 (2006.01) F02B 61/04 (2006.01)

Patent

CA 1255378

ABSTRACT 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 accordingly. The integrated circuit includes a first integrated circuit operated as an oscillator to produce a pulse train and also includes a second integrated circuit operated as a variable delay monostable oscillator receiving the pulse train and producing a pulse train having a variable duty cycle which is applied to MOSFET gate.

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