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Fan motor

Discussion in 'Electronic Design' started by Davou.w, Jun 15, 2007.

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  1. Davou.w

    Davou.w Guest

    Just a quick question from someone who is completely electronically

    I want to put together a quick science fair experiment, and I was
    wondering if I could use a scrap fan motor in order to generate

    What I mean to say is, provided I can find a way to turn it (wind or
    water power) is it difficult to coax a recycled motor component into
    generating electricity?
  2. colin

    colin Guest

    a 12vdc fan from a PC would need some modifying,
    youd probably need to take it apart and replace the electroncs with a

    other types of fans such as AC mains types are induction type wich are not
    very convenient generators.

    Colin =^.^=
  3. Baron

    Baron Guest

    colin inscribed thus:
    You could always pull an old CD Drive apart ! There are at least
    three motors in there that will all generate an output voltage if you
    spin the shaft.

    For example I am using a salvaged tray motor as a wind speed
    generator ! It will produce nearly three volts on a good day.
  4. Rich Grise

    Rich Grise Guest

    Don't mess with an unknown fan - these days, they're not like motors used
    to be, assuming you're talking about computer fans.

    For a science fair project, get a hobby motor for two or three bucks:

    These, being permanent magnet motors, will not only reliably generate DC,
    but can show speed/torque/voltage/current relationships with a couple of
    meters and a little analysis, which should really dazzle the judges. :)

    Heck, why not give them a hand crank for a _real_ hands-on display? :)

    Have Fun!
  5. Davou.w

    Davou.w Guest

    Well its not a computer fan, I was actually hoping to use an old room
    fan (the kind you can pickup and move around) Since I happen to have a
    junker on hand....
    A neat idea, but the idea I'm going for is to recycle as much as I
    possibly can.... I want to demonstrate and measure how effectively a
    homes electrical costs can be offset (and If I can use junk parts to
    do this, then all the better!). A crank is a neat idea too! I might
    add one in, just for flare ;) but right now, I wanna see about
    getting it to run on natural resources, and if necesary, but having a
    flow run from a pair of buckets that can be raised or lowered, and
    then swaped.

    Hope I can keep getting more usefull ideas!

    Oh, by the way, I also have a junker freezer, could the compressor
    motor be scavanged?
  6. Chris Jones

    Chris Jones Guest

    In general motors intended for AC mains power will be more difficult to use
    as generators, so avoid them.

    In principle any permanent magnet DC motor will do, for example from a R/C
    car, tape recorded, or the radiator fan motor of an old car, but you would
    need a lot of RPMs to get a decent voltage with any of these.

    You might find that big stepper motors out of old printers (e.g. from the
    dump) are a good way of generating reasonable voltages without requiring
    high RPMs. With stepper motors, what comes out will be AC. You might need
    to experiment to find which wires are connected to the same winding using
    an ohm meter. If you want to power a light bulb then the fact that it is
    AC won't matter, but to run a radio etc. you will need a rectifier and
    smoothing capacitor, and ideally a zener shunt regulator or similar.

  7. colin

    colin Guest

    I assumed he wanted it to have a fan to be able to turn it with the wind,
    if not then any brushed dc motor would be easier,
    they are so cheap from many hobby shops for models rc, electronics etc,
    I gues the one your refering to is a brushed type.
    so is it any use when theres a power cut or anything ?

    Colin =^.^=
  8. John Larkin

    John Larkin Guest

    Sorry, AC induction motors don't generate voltage if you just spin
    them. You need a permanent-magnet brush-type DC motor. Some little
    battery-powered fan might work. Don't expect much power.

  9. Jasen

    Jasen Guest

    not easily, a microwave oven platter motor on the other hand makes
    an excellent hand-cranked generator, but the output voltage is kind
    of high.
    permanent magnet motors work best

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