motor speed control

Discussion in 'General Electronics Chat' started by 3dracer01, May 10, 2010.

  1. 3dracer01

    Thread Starter New Member

    May 10, 2010
    3
    0
    Hi im new to forums and new to electronics

    im making a record player and i have a problem with controling the speed of the motor its a 6V running off a 1.5v power source

    how can i make the motor spin slower but can still use the same voltage
    i have other things that needs at least 1.5v
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If it is a low power motor use a resistor in series with it. However, if it is a high power motor use PWM to control the average voltage across the motor and thus its speed.
     
  3. 3dracer01

    Thread Starter New Member

    May 10, 2010
    3
    0
    im not sure if its low power or high power


    it spins really fast on full power

    would a potentiometer or some kind of hand control be used

    i want to be able to control it by hand too

    im soory i didnt say that before:)
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Use a belt speed reduction. A small pulley on the motor's shaft and a belt that goes around the record platter.

    The motor pulley should have a high spot in the middle; aka convex. That will keep a flat belt tracking in the middle of the pulley.

    You will need to use controls such as a phase lock loop in order to keep the platter rotation speed steady. If you don't, you will have very noticeable "wow" and/or "flutter".

    A heavy, well-balanced platter on really good bearings will help to minimize the wow/flutter. A flywheel on the motor will also help a great deal to keep the speed constant.
     
  5. 3dracer01

    Thread Starter New Member

    May 10, 2010
    3
    0
    thanks so much:)
     
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