variable speed control for 12v motor?
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    variable speed control for 12v motor?

    Hi,
    What I need is a system to allow me to control the speed of a small 12v motor by turning a knob. It has to go from zero to full rpm of the motor and have quite fine control over it. I have a 12v supply, so just need the speed control bit. The motor movement must be quite smooth, not jerky.
    buy, build, rip out of an old appliance....?

    any suggestions?

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    Re: variable speed control for 12v motor?

    you can buy manual servo operated speed controllers from model shops, maplins, or ripmax quite cheaply
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    Re: variable speed control for 12v motor?

    Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in sideways, thoroughly used, totally worn out and loudly proclaiming... "f*ck, what a trip!"

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    Re: variable speed control for 12v motor?

    Above link from Maplin is fine. Just watch how much current your motor takes.

    PWM control of the motor is the only way to go really. Linear regulation wastes a lot of heat/power and reduces the torque of the motor significantly at lower speeds.
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    Re: variable speed control for 12v motor?

    excelent, thanks.

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    Re: variable speed control for 12v motor?

    http://www.cpemma.co.uk/pwm.html

    if you need more current, use a different mosfet.

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    Re: variable speed control for 12v motor?

    You can pick up an old Model Railway controller no problem. They work from 0-12v and can be had pretty cheap. Mains powered too.
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    Re: variable speed control for 12v motor?

    How about an old battery drill motor control ..... high current rated :-)

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    Re: variable speed control for 12v motor?

    Quote Originally Posted by Chameleon View Post
    You can pick up an old Model Railway controller no problem. They work from 0-12v and can be had pretty cheap. Mains powered too.
    I think the model railway controller is best, and they're powered by 12v mostly, they have seperate transformers

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