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Speed !!

Discussion in 'Electronic Basics' started by D O'Reilly, May 14, 2004.

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  1. D O'Reilly

    D O'Reilly Guest

    I have an electric fan in my bedroom when even on its slowest setting
    is far too
    powerful,can anyone tell me how to adjust the fan with some sort of
    device or switch to lower the rpm's,your help would be most
    appreciated.

    Dave.
     
  2. Soeren

    Soeren Guest

    Hi Dave,

    You might be able to slow it somewhat with a capacitor.

    Another way would be to periodically remove a number of full waves of the
    mains, like if you were switching it on and off repetedly.
     
  3. Chols

    Chols Guest

    Wouldn't running at a very slow speed burn the motor?
     
  4. Soeren

    Soeren Guest

    Are you thinking of the reduced air-stream not cooling it enough ?

    If the power is on say 1 out of every 5 (full) cycles (or what the motor
    needs to go appropriately slow) it would see a proportionally less amout
    of power. It might draw a bit more than usual relative to the work done
    (less effiency), as it is in a permanent state of "semi start up", but i
    seriously doubt that it will burn.
    I haven't tried it out myself though, but I will in a month or so, as I
    have a large and too fast fan myself, selected from the principle that a
    large fan going slow (and silent) moves more air than a small noisy
    hispeed thingie.
     
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