Hi All,

Some good feedback and interesting suggestions. A couple of points to clarify (but thanks to those that made suggestions otherwise).

The point of this exercise is not so much to build the generator but to work out how I would build it. As mentioned, there are many

Science Fair projects out there in Internetland and the theory is simple and straight forward - wind some coils and move them through

a magnetic field. My theory of sticking Magnets to a Fly Wheel and spinning them past a coils should work no problems.

For those that suggested pulling apart or acquiring motors and spinning them some way - I agree that it is simpler and easier and almost

certainly cheaper but only gives me the end result. What I want is the satisfaction of working out how to do it, designing a machine that

will do it, and then seeing how close I get to the theory with actual test measurements.

For those who suggested the wind power generator path, that is sort of what I had in mind when I dreamed this up. I am investigating this

now, but many of these projects also use the "get a motor" method. Some use a method similar to my method but they are more of the giant

Science Fair project type - they work fine but you get what you get, there is no theory behind the designs to calculate what you get.

I have made some progress. I am not interested in PHD level explanations of how this works, just a working knowledge, and I am happy

to plug numbers into a formula. My interest is doing the exercise and having an understanding of what any formula actually calculates

and why it needs certain inputs, e.g. there will be some trig function involved because the rig spins - I get that. I will leave any heavy lifting

to a computer, I don't need to know Quantum Field Theory so that the arcane quirks make sense.

For those interested, I was put on to these sites:

Hi Andrew,

The generated voltage can be calculated using the first link below. The amount of power that can be generated (and hence current flow) is related to the amount of power provided by the force causing the rotation and generator efficiency. The wire gauge and resistance are inter-related and determine the amount of current that can be generated either due to voltage drop and/or fusing of the wire. The wire gauge does not affect the generated voltage until there is a load applied to cause current flow.

http://www.endmemo.com/physics/electricgenerator.php

More information in these links.

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/genwir3.html

https://www.electricaltechnology.org/2012/11/emf-equation-of-alternator-or-ac.html

https://opentextbc.ca/physicstestbook2/chapter/electric-generators/

Regards

John Clarke
Thanks to John Clarke fro Silicon Chip Magazine in Australia.

I am greatly enjoying all you input. Thanks for all of your help.

Cheers

Andrew