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Thread: PWM help


  1. #1

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    PWM help

    Hi, I am new here and was wondering if someone might be able to help me with a question. My robot is homebuilt on wheels. I want to steer the bot with an electric window actuator (from a car) The motor turns much to fast to control so I want to use a PWM to slow it way down. My question is what size PWM do I need.(size =volt and amp rating)

    Here are the specs of what I am using
    ~Sealed Lead-acid Batteries (12v12ah/20hr) 2 in series)
    ~Dorman 741-814 window actuator (Just the 12 volt motor!)
    ~DPDT switch wired for reverse to turn wheels left and right (servo attached to run remotely)

    Links to products used:
    http://www.energexbatteries.com/prod...ah%7B47%7D20hr

    http://www.amazon.com/Dorman-741-814.../dp/B000E347L6

    http://www.radioshack.com/product/in...ductId=2062530

    Thanks for any advice. Also if you have a better less expensive approch I will take any suggestions.

  2. #2
    dknovick's Avatar
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    RE: PWM help


    ORIGINAL: Daddysharky

    The motor turns much to fast to control so I want to use a PWM to slow it way down. My question is what size PWM do I need.*(size =volt and amp rating)
    Do you mean what size speed controller do you need?

    You may want to start smaller. These places all have good kits and parts:
    http://www.pololu.com/
    http://www.trossenrobotics.com/
    http://www.acroname.com/

    Getting back to your first question. The size of the speed controller depends on the voltage and current required for your motors.

    -Dave
    Helicopter: Closest fulfillment of the flying horse and magic carpet. Igor Sikorsky
    Royal EVO9 TX/F40,HBFP,Trex450Sport


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