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Wind generator question

Discussion in 'Renewable Energy' started by Mery, Aug 16, 2016.

  1. Mery

    Mery New Member

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  2. dr pepper

    dr pepper Well-Known Member Most Helpful Member

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    Heres an online calc:

    http://planetcalc.com/1908/

    Power is work done over time taken, loosely you can say work done is torque per rev (work part), and time taken rpm (revs per minute being the time part).

    Then you get watts, 740 watts = 1hp, so 5000w/740 = 6.75hp.

    Please note petrol engine hp ratings are not allways what they seem, you might well need an engine twice that rating to produce 5kw.
     
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  3. Mery

    Mery New Member

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    Hello dr pepper

    Thanks for the answer.

    Any suggestion for the 30 rpm?
    So slow speed.

    Thanks again
     
  4. dave

    Dave New Member

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  5. tcmtech

    tcmtech Well-Known Member Most Helpful Member

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    Use a gearbox to reduce the engine's speed down to 30 RPM or if the generator has a gearbox on it remove it.
     
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  6. Tony Stewart

    Tony Stewart Well-Known Member Most Helpful Member

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    Typically large # of Poles, 3 phase high voltage generators with phase control bridge to regulate RPM. Maybe instead of 4 pole maybe it is 24 pole.

    For DIY , use modified stepper motor.
     
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  7. kubeek

    kubeek Well-Known Member

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    Looks like a generator for a small water power plant.
    1575 Nm at 30RPM is 4.95kW of power on the input shaft. If you gear your motor such that it has proper RPM to give out 5kW, then you should be ok, but some headroom wouldn´t hurt.
     
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  8. Tony Stewart

    Tony Stewart Well-Known Member Most Helpful Member

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    When our group designed a 10m vertical axis windmill in 1975, the blades had to start in 5 mph wind with low friction.
    Gears would not be a solution here.
     
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  9. dr pepper

    dr pepper Well-Known Member Most Helpful Member

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    Yes the 30 revs is because wind turbines can be made to give high torque at low speed, the higher the number of blades on a turbine the higher the torque and the lower the speed.
    I'm not sure what you are doing exactly, if you want to drive the wind gen permanently from the engine, ie not use it as a wind gen anymore then if the wind gen has a gearbox to increase the speed to the alternator/dynamo remove it and drive it direct from the engine, if the alty/dynamo rotates at the same speed as the blades then you'll need a reduction box for the engine, there are various ways to do this depending on your skill / budget, you could get hold of a cheap geared motor, remove the motor machine a pulley and use its gearbox, or use a vehicle gearbox then you'll have changing gears, or even for a beer budget repurpose some pushbike gearing parts, 5kw might be too much for bicycle stuff though.
     
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  10. Tony Stewart

    Tony Stewart Well-Known Member Most Helpful Member

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    My guess is this would be for Sevonious blades
     
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  11. Mery

    Mery New Member

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    Hello dr depper.

    What I would like to do is use some sort of engine/motor for run that generator for produce 220v and 3-5 kW.

    Tony talk about stepper motor,what will be the solution?
     
  12. Mery

    Mery New Member

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    Hello,Tony.

    You,talk about stepper motor ....what solution?
     
  13. dr pepper

    dr pepper Well-Known Member Most Helpful Member

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    I think Tone's the best person to answer the stepper motor question.
     
  14. tcmtech

    tcmtech Well-Known Member Most Helpful Member

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    A stepper motor is an electric motor so all you would be doing is using electricity to power a motor to drive your generator which in turn would provide less electrical power than you are putting into driving it.

    To be honest, if you need 5 - 10 KW of 220 VAC generator power that can be driven from an engine you would be better off using a common AC generator that runs at a normal shaft speeds equal to what the engine runs at, say 1500 or 3000 RPM for 50Hz power or 1800 or 3600 RPM for 60 HZ power, not a super low RPM one.
     
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  15. fourtytwo

    fourtytwo Member

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    100% correct, this thread is like the blind leading the blind!
     

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