Does anyone have a good design for an electrical generator that uses magnets?

Question

I've had some success in getting an array of magnets and spindles to spin. I was thinking that if attached to a solenoid and properly configured, we may be on to something very green. Any suggestions? Stuff that can be obtained from department and hardware stores is best.

guru · Accepted Answer

there are many designs here, they all work well

http://images.google.ca/images?q=auto%20alternator&www_google_domain=www.google.ca&hl=en&emb=0&sa=N&tab=vi

all you have to do is replace the electromagnet with a permanent magnet, that's-it

Guru

billrussell42 · Answer

It's not possible. Not even remotely possible to generate power with no power input, just spinning magnets. 

There have been thousands (or more) people trying to build a working perpetual motion machine for hundreds of years, resulting in many thousands of models. Yet, not one, not one has ever worked.

.

lithiumdeuteride · Answer

A generator will always produce less electrical energy than the mechanical energy put in to drive it.  The second law of thermodynamics guarantees this.

There is a limit to how 'green' something can be.  That limit is 100% efficiency, and it cannot be reached, ever.  You can get very close if you're careful, but you'll always lose energy.

Does anyone have a good design for an electrical generator that uses magnets?

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