Dynamo design and construction

Hi,
I want to build a small dynamo to charge 4x 1,5V AA batteries. Does anyone know a book or url that explains what are the more
efficient dynamo designs and what are the relationship between the different variables like rotational speed/wire thickness/Output current etc. ?
Thanks/Brgds JJ
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------------- Take a motor from a battery operated toy and drive it by some other motor. It will be better than anything that you can make at a reasonable cost and size. Any design involves quite a few factors- number of poles. available speed of driving source, type of winding, type and srength of field poles used, required voltage and current. Such factor affect the size of the core, the number of turns on the winding etc. A crude version is relatively simple- an efficient one is not so simple and does cost more.
If it is an experimental toy- fine- but if it is intended as a serious charger, then go the electronic charger route- these are as efficient, have charge control (needed for NIMH batteries) and are cheap.
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Don Kelly snipped-for-privacy@shawcross.ca
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