motor speed control

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

  1. 3dracer01

    Thread Starter New Member

    May 10, 2010
    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
    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
    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


    Jul 17, 2007
    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
    thanks so much:)