1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

Wind energy to electric energy

Discussion in 'General Electronics Chat' started by Vaibhav Birit, Dec 13, 2004.

  1. Vaibhav Birit

    Vaibhav Birit New Member

    Joined:
    Aug 5, 2004
    Messages:
    54
    Likes:
    0
    Location:
    Mumbai, India
    i want to use non conventional energy source such as Wind energy to charge my Ni-Cad batteries.
    Can anyone provide me with an elegant circuit with good explanation for doing the same
     
  2. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    If you can get the correct Shape of Propeller..
    hooking it to a small dc motor should give you plenty of current to charge your NiCd batteries..
     
  3. TillEulenspiegel

    TillEulenspiegel New Member

    Joined:
    Apr 4, 2004
    Messages:
    179
    Likes:
    0
    Location:
    S2=X2+y2+z2-t2
    Actually It would help to know the voltage and amp hour rating for the batteries . As far as a propeller , use the fan blades from a window or bax fan. It's premade and el cheep-o
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey

    i found this on a website..i have just seen some Really cool generator blades ..
     
  6. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
  7. Vaibhav Birit

    Vaibhav Birit New Member

    Joined:
    Aug 5, 2004
    Messages:
    54
    Likes:
    0
    Location:
    Mumbai, India
    Thanks WilliB for the excellent pdf suggested. Also thankyou TillEulenspiegel for the info.

    I will start building one...
     
  8. Juglenaut

    Juglenaut New Member

    Joined:
    Apr 24, 2004
    Messages:
    176
    Likes:
    0
    How many batteries are we talking about in series that you want to charge?

    Using a 540 DC motor or better bearing motors, best would be a brushless motor that is rectified. Motors must be ratio'ed to a gear box or driven directly by a large spur gear and a small pinion gear to be efficient the load form the motor must be as reduced as possible but allow adaquet current and free flowing of the empellers.

    Just remember that the energy produced by the generator must be higher than that of the unit being charged, other wise it will just be a fan.

    Most DC motors I play around with need to spin way to fast to be pratical for generators with wind to charge a 7.2 volt battery, individual cell is a different case.

    I made one out a box fan with a gear the matched to the hub with 4 DC motors, two series in parallel bank with the other two series and some other stuff to make it happen. I found that if closely matched motors work very good for this. This generator produced about 8 volts at 3 amps with a steady 25 Mph wind, it is also good as a DC fan.
     
  9. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    youre welcome.. i built one last night .. cant wait to try it out..
    did you know that the Savonius wind generators are stackable !!.. :D
     
  10. TheOne

    TheOne New Member

    Joined:
    Oct 30, 2004
    Messages:
    464
    Likes:
    0
    Location:
    USA
    I can still remember many years ago, when I had some interest in this subject, reading about the "Darius eggbeater" and other turbines were fascinating stuff.

    http://www.nrel.gov/data/pix/Jpegs/00182.jpg

     
  11. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    I KNOW it Really IS..!!
    the pictures of the 'eggbeater' are awesome.!!
    and 500-kW is a lot of power..
     
  12. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    these Savonius wind generators have a lot of torque , for their size..
    the one in this pdf.
    http://www.re-energy.ca/pdf/cp1.pdf
    currently i have one attached to a small motor/generator..
    mounted directly to the motor shaft.
    problem is it doesnt spin fast enough..i may have to gear it..
    i am getting 1.1 Volts out of it .. when it is in front of a fan..
    if i use gears i can increase the speed of the generator although this really complicates the design ..
     
  13. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    unfortunatly i have no experience with gears..
    How should i do it??
    i think i want the drive gear ( from the Savonius ) to drive a large gear then drive a gear smaller than the drive .?? does this sound right..???
     
  14. DirtyLude

    DirtyLude Well-Known Member

    Joined:
    Aug 5, 2003
    Messages:
    1,904
    Likes:
    56
    Location:
    Toronto, Canada
    You'd have to show us a picture of the design. It doesn't sound like you made one exactly like the PDF shows. The easiest thing to do would be to use a pulley and belt. Make a larger wheel on the fan and a smaller on the motor. Run a rubber 'belt' between them. That's the easiest way, but it's prone to failure in the long run. I don't know what lifespan you want, but belts tend to slip and get loose, and don't like being exposed to the elements very much.

    If you want some decent gears, I got a bunch from All Electronics. http://www.allelectronics.com Go to 'gears' from the main menu, and 'SET OF 5 GEARS AND BUSHINGS'. 5 sets of the assorted gears or $10.00, and they come with adapters.

    Anybody making a bigger one of these, I saw a 'How it's Made' show on commercial wind generaters and they were using modified car alternators, which are more efficient then a generator. I would think you could get a smaller version out of a motorcycle or scooter for a smaller turbine. It would still have to be much larger than the project one shown in the PDF.
     
  15. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    Mark you're right i didnt use their design exactly..
    below are pics of what i did..
    this one is the Savonius wind collector part..
     

    Attached Files:

  16. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    this one is a close up of how i connected the motor /generator to the Savonius wind collector..that plate (with the screw at either end) above the motor is galvanized sheet metal..what you cant see is the connection of the plate to the nylon pulley connected to the motor shaft..
    i had to drill and tap two small screws to hold the plate ..
     

    Attached Files:

  17. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    I dont know why i didnt check the current before , But i just did and the motor puts out a respectable 0.040 to 0.060 A !! Even when turning very slowly..!! and i got it to produce a maximum of 0.91 mA ..
    At one speed it was putting out 43 mV and 62mA , with one meter reading voltage the other reading Amps.
    granted as it is now I would need 31 devices connected in series to charge a NiCd but i see potential here...
    i was wondering if there was any way to rewind the motor to output more voltage.??
     
  18. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    Maybe by using a higher voltage motor could I get more voltage out ou it..??
     
  19. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    what is a 540 DC motor ?
    8 Volts wow , how did you do it??
     
  20. williB

    williB New Member

    Joined:
    Aug 30, 2004
    Messages:
    2,217
    Likes:
    3
    Location:
    New Jersey
    the one in the PDF is small, about 5 inches tip to tip..
    my new version is almost 8 inches tip to tip , and almost 8 inches high..
    next i am going to try a really large one..maybe using a 5 gallon bucket..
    i think the trick is going to be to keep the mass of the airfoil as low as possible..
     
  21. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,203
    Likes:
    640
    Location:
    Derbyshire, UK
    A 540 is a common model makers motor.

    The voltage generated depends (obviously) on the type of motor, and the speed you rotate it at. You need to drive the motor quite fast, so gearing up will be essential.
     

Share This Page