How do I build a dynamo with a specific output voltage?

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Offline GrajScience

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I'm having a hard time finding information about dynamo construction.

I know how to build a simple generator.  Thanks 8'th grade science.

What I am having difficulty with is finding out how to build a dynamo with a specific output voltage.

I can buy one on the internet. Hand Crank 110v ac generators are all over the place.

But I want to build one with my kids in the garage.

If someone could just help guide my questions, so that I know how to ask the question in the proper format to get me to the information I am looking for, that would be awesome.

Is it primarily based on the RPM's?  The number of magnets? The number of windings?

Any help would be appreciated.

Thanks!
« Last Edit: 13/01/2016 20:17:57 by chris »

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Offline RD

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Re: How do I build a dynamo with a specific output voltage?
« Reply #1 on: 21/01/2016 00:09:23 »
You need a voltage-regulator circuit ...


http://www.instructables.com/id/Voltage-Regulated-5-V-Bicycle-Dynamo-Light-USB/

NB: Human-powered electricity is ecologically unsound ... http://www.cnet.com/news/human-energy-harvesting-a-very-silly-idea/

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Offline alysdexia

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Re: How do I build a dynamo with a specific output voltage?
« Reply #2 on: 23/01/2016 06:17:39 »
https://en.wikipedia.org/wiki/Dynamo > https://en.wikipedia.org/wiki/Faraday's_law_of_induction#Quantitative.

You'll need to go by the rated B strength in gauss or tesla if you don't own a meter, then take the sectional area of the wire itself (I think), rather than the loop, to find flux.