Hello.. i would like to ask if somebody can answer my question..
i need to know how many turns do we make in our coil..
We have a magnetic wire #32..
And we have a magnet with a strength of 150mT+ but just below 200mT(millitesla)
Our magnet has a shape of a semi-circle a bit wider than a U.. (the magnet we got is just from a hard drive)
Now we are going to make an generator with a magnet between 2 coils..
by the way we are making a WindBelt..
for you to actually know what i really mean and tried to explain, just click this link..
http://www.popularmechanics.com/technology/industry/4224763.html
now we don’t really understand what the equations of inductance really means because we are still new to the topic…
Can someone help us answer our question in the easiest and most understandable way?? Thanks..
26. July 2010 at 8:43 pm
The problem you will likely have is knowing the permeability of the core material you are using.
If you have that number, then the equations are easy to work out. Here is a calculator that will help you out:
http://www.ajdesigner.com/phpinductor/inductor_equation.php
Now, if you don’t know the core permeability, just wind, oh maybe 10 turns of your magnet wire around the core and test for the inductance. Knowing the other parameters, you can back into the permeability.
Good luck!
26. July 2010 at 8:43 pm
My answer isn’t about the calculation of N (number of turns) but just a comment about the invention shown and what you might encounter when trying to duplicate this idea.
The product shown is a cute idea…..but I’ll bet that electric fan he is using to power his product uses a LOT more power than the LEDs do.
The operating efficiency would seem to be quite low. As well, the windbelt could suffer fatigue failure from the vibrations of the belt strip, and the placement of the generating structure (the magnet and coil structure) cannot utilize the full amplitude of the oscillation of the belt.
In such a generator, a higher amplitude of mechanical oscillation can translate into a higher operating efficiency, as long as the mechanical limits of the coil and magnet structure are respected.
As a generator loads down (as you draw more current from it), the generating element (be it a windbelt or a rotor) produces mechanical resistance – this windbelt loses a lot of mechanical energy by virtue of the placement of the coil and magnet structure at the very ends.
A conventional rotary wind turbine has the advantage of being a proven highly durable structure, capable of withstanding a wide range of temperatures, climate conditions while providing many kilowatts of energy.
Do try to develop and improve this idea, I hope any of my observations can help you along this path.