It's only about 2KW rangeSorry, but needed information is definitely lacking. You might be talking about a 20KW system or 10W for all we know. Need to know, at least, how much power you expecting to generate and what RPM and torque the windmill provides. Probably much more.
Can you help ? I am new in generator making.... is higher voltage-rpm ratio is better ?For any particular set of requirements, the short answer is that you design and build the motor that you need. Any off the shelf motor that you can buy was designed for somebody else's needs and requirements. Are they close enough to your needs and requirements? Only you can tell.
Are you aiming simply to generate as high a voltage as possible? Or do you want a regulated voltage output (e.g 24/100/250V) with as high as possible output current capability? If the latter, what voltage? It may be that a standard alternator would meet your needs.is higher voltage-rpm ratio is better ?
In general, no. Most motors repurposed as generators will be not be ideal. They usually have too many turns of finer wire than desired. They'll make plenty of voltage if spun fast enough but not as much power as they would be capable of with less turns of heavier gauge winding.Can you help ? I am new in generator making.... is higher voltage-rpm ratio is better ?
Thank you for that. I knew intuitively from what I know about motors that an optimal solution was not readily available, but I could not articulate it clearly. You have done the TS a considerable service.In general, no. Most motors repurposed as generators will be not be ideal. They usually have too many turns of finer wire than desired. They'll make plenty of voltage if spun fast enough but not as much power as they would be capable of with less turns of heavier gauge winding.
Optimizing the power production by a windmill is extraordinarily difficult. All systems interact and you cannot optimize them separately.
The biggest challenge is the physical fact that the available power from wind varies with the cube of the windspeed. You might design a mill to optimally capture energy on the 3 days of the year you have 50mph winds. This would capture a large fraction of what is available throughout the year. But it would also be suboptimal most of the year. Conversely you could optimize your mill for 10mph and this would do a better job on most days. But you'd have to shut it down on the high wind days because a design that's optimal at 10mph can't possibly be expected to function when the input power is 3 orders of magnitude higher.
What to do? Rely on the experience of others and accept that "good enough" is the best you can expect on a DIY project. Find and follow a proven design.
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