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Thread: Mosfet Motor Driving

  1. 20th August 2006 07:34 AM #1
    samarsingla
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    Default Mosfet Motor Driving

    Hi
    I want to drive a dc motor in simgle direction but control its speed. I want to use a mosfet with pulse width modulation. Please can someone tell me how the protection diode is to be connected?
    Thanx.
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  2. 20th August 2006 08:31 AM #2
    Styx
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    have the FET as a low-side drive and put the diode across the motor cathode at +VE rail

    have a look for simple chopper cct's, effectively a machine can be treated as an inductor thus the simple low-side drive chopper cct with anti-parallel diode to provide freewheel path is valid
    Nothing is impossible.
    Once a problem is realised, the rest is just details


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  3. 20th August 2006 08:42 AM #3
    samarsingla
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    actualy I am a beginner and didnt get much of what you said.. sorry..
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  4. 20th August 2006 10:53 AM #4
    Styx
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    If you use the search function you will find many a thread about DC-voltage control, brushed-DC machine control, freewheel diode, Chopper ccts and protection diodes

    here is a start
    Ques about power mosfet internal diode

    I even posted a picture/circuit in this one
    Nothing is impossible.
    Once a problem is realised, the rest is just details


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  5. 20th August 2006 02:08 PM #5
    Hero999
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    Please do not make more than one thread asking the same question.

    IRF540n

    I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

    Please ask on the open forum if you have a question and I'll be happy to help,     if I know the answer.
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