Wind Generator Using 38 volt Ametek DC Motor


October 1st, 2008

This is a home made, diy wind generator using the popular 38 volt Ametek DC motor. Blade speed is geared-up about 2x with belt pulleys to make it spin faster.

Here is my video.

Duration : 0:4:48


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11 Responses


  1. rclewis01 MonsterID Icon rclewis01 Says:

    Great job and excellent …
    Great job and excellent video. Thanks. A real quick question. Do you need a diode in line to the batteries? Also I was wondering what size of pipe did you use for your blades? Do you recommend a certain size?

    I’m showing that motor to be 38 VDC, 12 amps, and 1150 rpms. My DC motor analyzer says you should be using a 4.5 foot diameter blade..but 4 foot is good too. In theory you should get about 10 amps in a 20 mph wind going to 12 volt battery. The motor could push up to 500 watts in about a 30 mph wind.


  2. ajonate MonsterID Icon ajonate Says:

    They are 24″ each, …
    They are 24″ each, which makes the overall blade span just a little over 4′.

    I didn’t make a point of it in the clip, but I used ABS pipe to make my blades instead of the PVC pipe that most wind turbine builders use. The ABS is a little more flexible, but ABS stands up to sunlight much better than PVC. The fact is that ABS is so stable in sunlight that it’s even used for certain auto body parts.


  3. larrylawrencejr MonsterID Icon larrylawrencejr Says:

    Thanks a bunch …
    Thanks a bunch again for the information. I like how you show everything in your video and really do appreciate all your efforts. I am going to order all the parts you did and I plan on trying it with my Ametek 38v as soon as the parts arrive.


  4. ajonate MonsterID Icon ajonate Says:

    I got the large …
    I got the large pulley from Home Depot in the evaporative cooler scetion. I believe it was a 12″ pulley.


  5. ajonate MonsterID Icon ajonate Says:

    Sure. I got it at …
    Sure. I got it at Checker Auto Parts locally. The belt size is a portion of the part number. They know how to give you a 40.5″ belt, or whatever you need.

  6. larrylawrencejr MonsterID Icon larrylawrencejr Says:

    Thanks for this …
    Thanks for this video! Great job! You know I could not find anything from anyone about using geared pulley setup. You are the only one I could find. please post more info on the pulleys and belt used as well as their sizes and where others can purchase them. Again, thanks for the video and keep them coming if you get time. larry

  7. ajonate MonsterID Icon ajonate Says:

    Yes, I’m using a …
    Yes, I’m using a diode. It’s inside the power shed where it connects to the batteries. Actually, I’m using two 6 amp diodes in parallel.

    I used 4″ ABS pipe for the blades. I cut so that the tip was about 1″ wide, and made a straight cut to about 3″ before the connection end. The overall diameter is very close to 4.5 feet, since the blades themselves are 24″ and there is some open area at the hub.

  8. ajonate MonsterID Icon ajonate Says:

    I don’t really know …
    I don’t really know yet. I’m not running a charge/controller. I do have it connected directly to my battery bank to prevent it from over-speeding, but that’s a poor way to charge batteries. I’ll have it in a charge controller before long and post some numbers.

  9. Steve MonsterID Icon Steve Says:

    Thanks for sharing. I just bought a 38 VDC off ebay for $98. Looking forward to figuring it out and this video will help a bunch. Do you have another video showing the hook ups to your batteries?

  10. vimal MonsterID Icon vimal Says:

    hi friend,your wind genarator seem good.in fact i bought an ametek just like yours to make a wind turbine but i am not able to figure out information about the output voltage ,amps ant watts of the motor.i want to know at what rpm it should turn to produce 12 volts and the amps produced too.thanks

  11. tubbs MonsterID Icon tubbs Says:

    @VIMAL, look on the motor itself for output voltage or check on google search “Amtek motor spec Part No.” Get a Volt / Amp meter from Maplin or Radio Shack to test amps and volts very cheap, usualy yellow with red and black pronged contacts £2.99, then look for a Solar Charge Controller , this will maintain what Voltage and Ampage you need for your project but you need to know your projects target volts and amps 1st, these are very easy to connect, so 1st determine what ampage you need to cap the project at, for my project it needed a 3amp 12v Solar Charge Controller, ao I searched google for “12v 3amp solar charge controller” that means even if my pannel or turbine went to 24v and 5 amps i’d still only get the 12v 3amps I need without the risk of blowing my equipment up. I still want to build a wind turbine just good enough for a netbook PC, would love that analyser that can predict what size blades you need for the correct ampage and volts, very cool. I imagine PowerTraveller.com are the nearist to getting this solved.

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