DC motor control

Discussion in 'The Projects Forum' started by m.sabeeh, Jul 13, 2010.

  1. m.sabeeh

    Thread Starter New Member

    Jun 26, 2010
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    i have 24VDC 13A motor. iw ant to change its rpm (~2900rpm) smoothly from lower to maximum. need some kind of controller. can i build it at home?. help :) advance thankx
     
  2. JonHopper

    New Member

    Jun 28, 2010
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    You can... however , PWM Motor Controllers are fairly cheap (60 - 100$) and have a lot of features that would take a long time to build at home.

    If you wanna build it at home though, a simple power H Bridge and a PWM generator (microcontroller of some kind is the most popular) should do the trick.

    Lots of application notes at microchip.com
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    A simple PWM controller will allow control of the motor speed; if reversing the motor is not required, an H-bridge is not needed.

    [eta]

    See the attached. Note that D2 (across the motor) needs to be rated for the motors' current.
     
    Last edited: Jul 13, 2010
  4. m.sabeeh

    Thread Starter New Member

    Jun 26, 2010
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    ooops difficult to build. john hopper said that these are cheap and having many features. will anyone of u suggest some model of pwm that are cheap can handle maximum current and voltage. thnkx
    i want some cheap and reliable kinda thing ;)
     
  5. SgtWookie

    Expert

    Jul 17, 2007
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    Gee, my schematic is difficult? 15 parts isn't bad for as much functionality as you'll get.

    You could replace the LM317 with a 7812. That would get rid of R1, R2, C2.

    You don't absolutely have to have C5. It does make the circuit more stable though.

    R5 could be eliminated, but it's a "safety valve" in case the 555 timer breaks, or you remove it from the circuit.
     
    m.sabeeh likes this.
  6. m.sabeeh

    Thread Starter New Member

    Jun 26, 2010
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    0
    ok will try to build that one. but as i said before, iwant u to suggest some ready-made model that can handle that amount of current and easily available in the market. if that are cheap then i will prefer to buy ;)
     
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