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# A higher voltage DIY generator?

Wed 19 Aug, 2009 03:33 am
Hi,

I am trying to create a DIY linear generator like http://www.creative-science.org.uk/gensimple1.html. However, I am wondering if this design i thought of will work or not or give more voltage or not.

Basically, instead of a solid coin-like NIB magnet like the one in website, i will be using a hollow tube shape NIB magnet instead (please refer to image http://www.filefactory.com/file/ah2f2f4/n/Scan10085_JPG ). I am wondering if this design, giving more surface area and thus more change in flux (?) will allow higher voltages to be produced. Because i need around 1.2 V to light an infrared LED for 1/30th of a second and want to minimize number of windings.

Thank you very much.
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engineer

2
Wed 19 Aug, 2009 08:25 am
@kbbkk,
From the article you referenced:

Quote:
The peak voltage generated by this little device is given by:

V = A x M x N

Where A is the cross sectional area of the can (0.0008 m²), M is the rate of change of magnetic field (ca. we need to use very strong magnets having a surface field of say 1 Tesla (see magnet info. below), so shaking it say 5 times a sec we get M = 5 Tesla / sec) and N the number of turns.
If we want an LED to light brightly we need to generate peak voltages of about 4V;

rearanging the formula allows us to estimate the number of turns:

N = V / (A x M) = 4 / (0.0008 x 5) = about 1000 turns - happy winding !

If I'm reading this correctly, the size of the magnet is not important, it's the cross section of the container holding it. If you want to reduce the number of windings, I suggest increasing the rpm of the magnet.
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1
Wed 19 Aug, 2009 08:56 am
Remembering my rusty physics, it's the strength of the magnetic field, not the shape of the magnet that affects the amount of current generated.
0 Replies

rossweinberg21

1
Mon 14 May, 2018 12:35 am
@kbbkk,
kbbkk wrote:
I am trying to create a DIY linear generator like http://www.creative-science.org.uk/gensimple1.html. However, I am wondering if this design I thought of will work or not or give more voltage or not.

Basically, instead of a solid coin-like NIB magnet like the one in the website, I will be using a hollow tube shape NIB magnet instead (please refer to image http://www.filefactory.com/file/ah2f2f4/n/Scan10085_JPG ).

I wanted to create a DIY linear generator too and wanted to visit the URL you mentioned in your post as well, but it's 404.
engineer

2
Mon 14 May, 2018 11:28 am
@rossweinberg21,
The link has an extra period on the end. Take that off and it will work fine.
0 Replies

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