Controlled DC motor

Discussion in 'Homework Help' started by Kaycee, Feb 6, 2015.

  1. Kaycee

    Thread Starter New Member

    Feb 6, 2015
    I was assigned a project for school and I need some help.
    I need to control the speed of a DC motor. I'm using a battery with 9.6 V and 3200 mA.
    Currently my plan is to use a a potentiometer to control the speed. I just don't know how to determine the size of pot i will need.
    Any ideas?
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    This post should be in Homework.

    How can you design something if you do not know the requirements? You have some measurements to do:

    How much voltage does it take to operate the motor at full speed?
    What is the motor current at full speed?

    How much current does it take to operate the motor at half speed?
    What is the motor current at half speed?
  3. Efron


    Oct 10, 2010
    With a potentiometer you will be able to reduce or increase the current through the motor, but its speed will depend on this current and on the load (otherwiser why should you use a motor if there is no load).

    But to stabilise the output current you need a more complex circuit.

    What is the purpose of your project?