PWM Motor Questions

Discussion in 'General Electronics Chat' started by mlkcampion, Jun 25, 2007.

  1. mlkcampion

    Thread Starter Active Member

    Nov 16, 2006
    Hey Forum
    Iam using a Pic 16f877 to control a DC motor with PWM.
    The setup is extremely basic with a HEXFET driving the
    At the moment i have everything working and i have just made
    an improvement on the audible noise coming from the motor by
    increasing the PWM frequency.
    I have alot of questions regarding PWM and DC motors, i dont even
    know where to start (e.g effects of PWM on brushes of motor,
    what is a good frequency and how does it effect the torque of
    the motor, effeciency, EMC noise due to using PWM on a dc motor
    that is EM frequencies coming from brushes and leads).
    So as you can see even though i have an extremely basic circuit i have
    to wonder what massive improvements can be made to improve the
    circuit and would they be worth it. Iam finding it very difficult to get some honest and useful information on this, its easy get information on PWM and easy get information on DC motors but not on PWM&DCmotors.
    I guess what i need is to draw on somebodies experience and i would appreciate any pointers or direction to comprehensive documentation on
    this subject.

  2. niftydog

    AAC Fanatic!

    Jun 13, 2007
  3. Tube Tech

    Active Member

    Jan 11, 2007
  4. mlkcampion

    Thread Starter Active Member

    Nov 16, 2006
    Cheers for the reply, definately something to be learned from
    each of the links.

    Thanks alot
  5. ali.mir10v

    New Member

    Dec 3, 2008
    i am standing at the same position whr u r but i have some exp in using pic16f886. so r u able to provide me the data , schematic and code of that program so that i can do the same at home and learnthe skill as quickly as possible.plz do my fever
  6. mik3

    Senior Member

    Feb 4, 2008