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Engineering
Electrical Engineering
How do we determine the ideal size for our wind turbine's generator?
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[QUOTE="anorlunda, post: 5448771, member: 455902"] Must you calculate the torque from first principles, or just estimate it? If efficiency is 100%, then torque*speed = voltage*current (after suitable units conversion.) Most generators are pretty efficient, so a guess of 75% efficiency for your home made generator seems to be pretty conservative. So just divide the required 10 watts by 0.75 to get estimated torque*speed. To improve efficiency, my guess is that the bearings are more important than the weight. Is your apparatus required to be self starting? You may need significantly more torque to spin it up starting from zero RPM than to keep it running at rated RPM, and the acceleration does depend on weight. If self start is not required, then a push by the hand to start it spinning would be allowed. Alternatively, he electric load could be removed for startup and switched in after achieving rated speed. Both alternatives mean manual intervention. [/QUOTE]
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How do we determine the ideal size for our wind turbine's generator?
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