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wind turbine project

Discussion in 'General Electronics Discussion' started by davez, Jan 20, 2015.

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  1. davez

    davez

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    Oct 11, 2014
    I am planning to create a wind turbine that will be able to charge phones i need help in finding a good dc motor
    will a 12v 25w dc motor with 3500rpm be able to create enough voltage to charge the phone?
    Here are the materials that I have for the project:
    *blocking diode
    *Electrolytic Capacitor 2200uF
    *the blades/proppeler
    *12v/6v rechargeable battery (lithium)

    note Im asking you guys to help me if the motor will be ok for the project if not please help me find a good one :D
    thank you and God Bless :)
     
  2. duke37

    duke37

    5,297
    739
    Jan 9, 2011
    The 12V permanent magnet motor will produce 12V at 3500rpm. Can you spin it that fast? you could use it at a lower speed and boost the voltage. You can get circuits which will take varying voltages and output a constant voltage.
     
  3. davez

    davez

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    Oct 11, 2014
    so if i will be able to find a motor with lower rpm will that be ok?
     
  4. davez

    davez

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    Oct 11, 2014
    please check this video
     
  5. Merlin3189

    Merlin3189

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    Aug 4, 2011
    Permanent magnet motor voltage output is proportional to speed. So if it gives 12V at 3500 rpm, it should give 6V at 1750rpm. So you don't have to use one just at its rated speed.

    Your problem is getting a wind turbine to turn something efficiently at any speed - unless you are planning to run it next to a fan! You want a motor with low friction, but not too heavy. The electrical side is not a big problem. Design is well known & understood. Turbines (fans, propellors, etc.) are much more difficult.

    Yes, if you can find a motor that is designed to run at low speed and high voltage, that saves you converting the output. It will give lower current, but you are looking at a fairly low current application here. The question is how fast is your turbine going to run? Then, other things being equal, you want a motor that gives the voltage you need at that speed.

    Maybe, build a turbine and measure its speed & torque characteristics. That will tell you what power you can get from it and so what generator you want. If you can't get one suitable, it's not a big problem. As Duke says, you can convert voltages without too much inefficiency.

    Just checking back with your first post, I see you have this motor. So you need to see how fast you can turn it and that will tell you the max voltage you can get. Of course it will slow down a bit when you connect the circuit, so you need a bit of leeway.
     
  6. duke37

    duke37

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    739
    Jan 9, 2011
    I have never played with stepper motors but they may be suitable. They have no brushes so will be low friction, they may however have significant cogging where considerable torque would be needed to start. They would produce AC so would need the two windings rectified before combining.
     
  7. davez

    davez

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    Oct 11, 2014
    im still searching for a suitable a motor :D but thanks for the info i will try to find a low rpm motor :D
     
  8. davez

    davez

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    Oct 11, 2014
    hey guys i have bought a dc servo motor will this be ok..its manufacturer is yaksawa?
     
  9. BobK

    BobK

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    Jan 5, 2010
    That is an interesting choice. Can you link to the motor you bought?

    Bob
     
  10. BobK

    BobK

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    Jan 5, 2010
    Surely you are joking? $785?

    Bob
     
  11. davez

    davez

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    Oct 11, 2014
    nope i only bought it for $25$ i was able to find some from second hand motor sellers in our place
     
  12. Merlin3189

    Merlin3189

    250
    69
    Aug 4, 2011
    And it is a stepper motor?
    It looks like a DC servo motor. If it is, it would be no better than an ordinary DC motor and might have more friction due to the servo element.
     
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