Permanent Magnet Generator - DC

Discussion in 'The Projects Forum' started by engineer20033, Apr 14, 2015.

  1. engineer20033

    Thread Starter New Member

    Apr 9, 2015
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    Dear Experts,

    I am building a vertical wind turbine, and I am searching for an European manufacturer for a DC permanent magnet generator, the rated power should be (5KW to 10 KW) at 100 rpm, so is there any one knows where to buy it?
    Note: it should be manufactured in Europe.

    Best Regards,
     
  2. JDT

    Well-Known Member

    Feb 12, 2009
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    10kW at 100 rpm is going to be huge beast!
     
  3. engineer20033

    Thread Starter New Member

    Apr 9, 2015
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    I found some generators but made in china, and the weight is about 200 Kg, so I wonder if something similar in Europe
     
  4. engineer20033

    Thread Starter New Member

    Apr 9, 2015
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    It is ok if we got a DC generator with 5KW rated power at 100 rpm...
     
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    How big is the turbine?
     
  6. engineer20033

    Thread Starter New Member

    Apr 9, 2015
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    We are still doing the prototype, but it should be small vertical wind turbine
     
  7. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    Small? What is small? How small should your vertical wind turbine be?

    1.jpg

    The point is that an engineer should be more specific.
     
  8. engineer20033

    Thread Starter New Member

    Apr 9, 2015
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    If we talked about weight, so it should not be more than 450 Kg... but all what we are searching for is a DC Permanent magnet generator, 5 KW or 10 KW output power at 100 rpm... regardless the weight or the size because we can adjust the whole design according to the available generator... we really spent 1 month searching for such generator in Europe and we failed, so I really appreciate any help in this.
     
  9. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    To get even 5kW from a vertical-axis turbine will require something more than a 'small' turbine IMO, unless the turbine can be mounted high above ground level, bearing in mind the vertical wind shear.
    The Windspire VAWT, for example, which is rated at 1.2kW, has a 20ft high 4ft diameter rotor (according to this article). So you'd be looking at a rotor swept area ~ 4 times as big.
     
  10. wayneh

    Expert

    Sep 9, 2010
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    I think a trip to the drawing board is in order. Getting 5-10kW out of a "small" VAWT would require massive wind speeds.

    Of course one person's "small" might be another's "huge". Such words are not very useful to an engineer.
     
  11. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Why do you want to run a generator at only 100rpm? Can't you gear it up?
     
  12. tcmtech

    Well-Known Member

    Nov 4, 2013
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    When dealing with low speed high torque power sources it is inevitably more cost effective to use a gearbox to bring the low speed high torque power up to a higher speed lower torque equivalent.

    Now that said the most common argument I get against that is that the wind turbine blades only have so much power available so adding a gearbox will eat up some of that. I however have always looked at it as the power source is free so just make the blade system larger to make up for the gearbox losses or just derate your output capacity a bit.
     
    dxTime likes this.
  13. dxTime

    New Member

    Apr 14, 2015
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    Now ultimately all of you generous replies lie a great distance away from the actual question.
    Which is where in Europe can I buy a magnet generator with rated power of 5kW - 10 kW at 100 rpm?
    He is talking about a prototype of some sort so although all of your points are valid what he might have a revolution in the form of 80% efficiency.
    My suggestion look at ebay: http://www.ebay.co.uk/sch/i.html?_f...TRS0&_nkw=permenent+magnet+generator&_sacat=0
     
  14. wayneh

    Expert

    Sep 9, 2010
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    There are exactly zero offerings there that meet the stated requirements. Why are you sending the TS on a wild goose chase? (Sorry if that expression does not translate well.)
     
  15. dxTime

    New Member

    Apr 14, 2015
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    A wise cat ones said
    .
    I've no time to look through all of Google and other such directories to find a viable option should there be even one. With nothing more to contribute I wish you success!
     
  16. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Something like this? Even if that model is too low power or unavailable in Europe, the vendor may be able to point you in the right direction.
     
    Last edited: Apr 15, 2015
  17. alfacliff

    Well-Known Member

    Dec 13, 2013
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    a freind of mine built a vertical turbine, Savonius(sp?) type from split barerels. he used a truck differential at the bottom to get a higher rpm, and used it to power a rock tumbler. advantages of a vertical are that they dont have to turn into the wind, and properly designed are self limiting in high winds. one advantage for the diferential was that you could use the brake on the other axel to turn on and off the axel you were using.
     
  18. wayneh

    Expert

    Sep 9, 2010
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    I'm with the other posters here. I don't see a solution where gearing up the rpm is not the more effective approach. You might be able to find or build the "perfect" low-rpm generator, but it will cost so much more in weight and so on, that it can't possibly compete with a simple gearbox combined with a smaller, higher-rpm generator. The small efficiency loss of a gearbox can easily be made up with larger vanes, so that the overall solution is far more effective.
     
  19. engineer20033

    Thread Starter New Member

    Apr 9, 2015
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    Thank you all for the advise, it seems that using the DC generator was a dummy idea, so we will go to AC generator with inverter, but the problem is that we are not sure how to control the AC generator with the inverter. Does any one have any idea?
     
  20. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Won't the turbine be driving the AC generator? Why the inverter?
     
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