sahil2309 said:
i'm looking to design a generator, can someone just help me out, the following are the main criterias:
It'll have a power rating 30KW
RPM like between 120-200, so basically its a low RPM design;
i plan on using Carbon fibre for all the components on the rotor other than the power generating components.....should basically give very low inertia for the same structural strength as steel...
also can someone tell me how to determine the power rating of the generator based on the magnets and copper windings?
Sahil :
I see you as one of the Curious Joe about free energy or wishful thinker. Anyways, I have thought something like you before. So I have few things to share with you.
1] Using Carbon fiber to replace parts other than Magnets and Coils is very expensive. You will end up in spending more than 10-25 times cost of traditional motor.
2] Reducing weight of generator won't give you any advantage. Unless you are trying to use in in Airplane.
3] Having Still/Iron core improves output of the Generator. Air core generator will have less output. You can try this simply by using single coil / magnet and iron piece. Watch this video to see it in action
https://www.youtube.com/watch?v=4vyJcdf-nCk
4] Having heavier Rotor will help you in better way as its inertia will help you when the generator is running. Only drawback is at the start you will need more power to rotate it.
5] If you are looking for very light weight generator, then you don't need anything apart from Coils and Magnets + supporting frame for them. You can make it by using any light weight material which can withstand high temperature.
6] Before starting designing such huge generator, try very simple and easy one. https://picasaweb.google.com/116297647808736459252/Mar92014?authkey=Gv1sRgCO2oqueouPGnUw#slideshow/5988894475777428818, which will give you some insights about Generator. e.g. how much output you can expect at particular RPM. Lower the RPM, lower the output.
7] Always remember one thing : No matter what/how/when/where you think, Output of any machine will be always be less than input given.
8] Before going any further, just run a simple test like this: - Make a Copper or aluminium coil of 50 or 100 turns, join both terminals of it [short circuit it], and then move it across the magnet. You will notice the opposite force. That effect may be called as CEMF or simply Newtons third law or Lenz's force or the Force, which will shatter your Dreams of making this big Generator.
Let us know what you decide or see what you make.