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100v (japanese) to 120v (usa) on a capacitor motor

Discussion in 'Electronic Repair' started by [email protected], Feb 5, 2007.

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  1. Guest

    hey smart people,
    i have a japanese fan that i want to install in my attic on
    thermostat. its from a clean room in japan, running on 100v. ive heard
    that i can do this without a transformer, "it will just run hot".
    is this true? is there a chance of fire? just how hot? will it likely
    smoke in a week? or a year?
    thank you
  2. Mike Berger

    Mike Berger Guest

    That could be a significant overload. Use a transformer or maybe
    a light bulb in series. It's not unusual to see 127 volts on the
    lines here. Unless there's something very special about the fan
    I wouldn't bother.
  3. Is the fan 50 or 60 cycle?
  4. Get a power transformer with a ~20 V secondary rated for the current of
    the fan. Then wire the primary across the line, secondary in series with
    the fan with reverse polarity. You can probably find a suitable transformer
    on eBay.

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  5. James Sweet

    James Sweet Guest

    I would use a transformer. It can be done cheaply by wiring up a 120V to
    24V power transformer in a buck configuration. You can get one of these
    cheaply from anywhere that sells HVAC surplus. Just make sure the
    secondary is rated to handle as much current as the motor draws, it does
    not have to be a very big transformer because it is not powering the
    full load of the fan.
  6. Guest

    thank you very much, that sounds likea great idea.
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