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DC Voltage regulation

Discussion in 'Electronic Basics' started by [email protected], Feb 8, 2007.

  1. Guest

    I have a 12 volt dc 690 rpm permanent magnet motor that I'm wanting to
    use as a wind generator. The problem is that when I spin the shaft at
    15 to 20 mph it produces 30 to 45 dc volts. I would like to regulate
    it down to a constant 14 volts or figure out how to convert it to ac
    voltage . Any ideas

    Thanks,
    Mark
     
  2. There are a ton of sites on the web and books on home power generation. I
    bet your library has one or two.
     
  3. kell

    kell Guest

    Run, don't walk to
    www.fieldlines.com

    I presume you cite 14 volts because you want to charge a battery bank
    with it. The battery bank will hold the voltage down without use of a
    regulator. You can use a dump load to keep from overcharging.
    Regarding turbine stalling and various other issues, I am not
    qualified to address them, but you will meet some real whizzes at
    fieldlines that have impressive experience and knowledge of
    alternative power.
     
  4. Guest


    Can you explain Dump Load? Is this done with resistors and a contactor?
     
  5. kell

    kell Guest

    when the batteries are charged, you need to "dump" the power the wind
    turbine is putting out. You need a load; just disconnecting the
    turbine electrically is a very bad idea because then there is no
    resistance, and the turbine can overspin and destroy itself (this
    does happen).
    And yes, you could use a contactor and resistors, but they must be
    very high power resistors. Some people use a water heater as a dump
    load, for example. You will need a dump load controller circuit. I
    could talk about it in theory but since I lack hands-on experience I
    won't presume to advise you. I suggest you go to fieldlines.com and
    search the site for information about dump load controllers, then go
    on the board and make a post asking for advice.
    That way you'll have demonstrated that you have already put a little
    effort in by searching before requesting help, and you will get more
    respect on the board.
     
  6. Jamie

    Jamie Guest

    yeah or, more batteries! why waste power when you should be storing it!
    Sell it off! :)
     
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