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Vrystaat 11th June 2020 03:47 PM

DC motor speed control
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Good day all.
I need some advice plse. I have a motor that is mounted on a rotisserie, It works from 3Vdc ( 2x 1.5V batteries in series). I want to make an adjustable circuit between 3 to 5Vdc to drive the motor without having to worry about batteries.I have 12V 1.5A smps's that I want to use as they are small.
the resistance of the motor is 2.8R, meaning the current will be 1.071A at 3V and 1.78A at 5 volt. Watts drawn will be 3.21 and 8.9 watt respectively.
I have used a 11R 25 watt resistor as a voltage divider to test, The voltage is almost 3Vdc but the resister gets hot soon. What would be the easiest way to control the motor without having to use a bulky circuit, well I can all way's use a long connecting lead. This is what I have in mind, Would be using a mosfet work better ? Help appreciated:)

Refugee1 12th June 2020 02:59 AM

You can buy or salvage from an old computer board 4 legged SMPSU chips from things like V-Core regulators.
You need to be handy with a modeling knife to make the PCB.
There are three or four external components.
SMD marking code websites are an evening of fun once you find something close.
There are some variable ones out there on old motherboards that have V-Core settings in the BIOS.

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