Potentiometer Question.

Discussion in 'The Projects Forum' started by ItsAciD, Apr 24, 2013.

  1. ItsAciD

    Thread Starter New Member

    Feb 14, 2013
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    Ok so my voltage source is a external DC Supple, that gives an output of 12V 1.5 Amps. That drives a DC Motor. I want to control the Speed of the DC Motor, however when i connect positive to terminal B, and output to C, The motor does turn on until i reach fully clockwise, and i see a spark, i know thats bad, so i wanted to know how will/can I control the speed of the DC Motor? With a different Pot? The pot I am using is a B10K Pot. Thanks!
     
  2. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    Your motor apparently draws too much current for the pot. You will need a driver circuit using a transistor that is controlled by a pot. Google DC motor speed control and "read all about it."
     
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  3. ItsAciD

    Thread Starter New Member

    Feb 14, 2013
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    ok thanks!! For the information!! Let me give in a look at that.
     
  4. PatM

    Active Member

    Dec 31, 2010
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    You could also try using a wire wound pot with a linear taper and a much lower resistance.
    10K is too much for what you are trying to do.
     
  5. ItsAciD

    Thread Starter New Member

    Feb 14, 2013
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  6. ItsAciD

    Thread Starter New Member

    Feb 14, 2013
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    But wouldnt i still a spark out of it, because the motor is drawing alot of current?
     
  7. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    You need to tell us what the current draw of the motor is. The power supply rating of 1.5A tells nothing about the motor, except that it must not draw much more than that. Pots that can handle much power are usually pretty expensive, and that's why folks build a motor control circuit using cheaper parts. Also, the motor loses torque when turned down by a pot. A PWM controller reduces speed smoothly without as much torque reduction.
     
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