High Voltage Forum

General electronics => Electronic circuits => Topic started by: Physikfan on June 27, 2018, 06:34:22 AM

Title: Magnetic field measurements on disc magnets
Post by: Physikfan on June 27, 2018, 06:34:22 AM
The magnetic flux density was measured at the surface of permanent disc magnets by a Hall probe:

Disc magnet 30mm diameter, height 15 mm, NdFeB:

(https://highvoltageforum.net/proxy.php?request=http%3A%2F%2Fgalerie.experimentierkasten-board.de%2Fdata%2Fmedia%2F201%2FIMG_4194400x214.jpg&hash=904cd102f417bd18a3af01b827c2f365)
(https://highvoltageforum.net/proxy.php?request=http%3A%2F%2Fgalerie.experimentierkasten-board.de%2Fdata%2Fmedia%2F201%2FIMG_4199400x368.jpg&hash=e665c3742eeafe4b7513399aa125923f)

Results:

Disc center 0.44 T
1 cm distance 0.2 T
2 cm distance 0.06 T
Edge up to 0.5 T
Side part of the disc (curved) 0.06 T

Disc magnet 45 mm diameter, height 30 mm, NdFeB:

(https://highvoltageforum.net/proxy.php?request=http%3A%2F%2Fgalerie.experimentierkasten-board.de%2Fdata%2Fmedia%2F201%2FIMG_4197400x235.jpg&hash=d82fb39c96b883b39c6b0051c2757ebe)
(https://highvoltageforum.net/proxy.php?request=http%3A%2F%2Fgalerie.experimentierkasten-board.de%2Fdata%2Fmedia%2F201%2FIMG_4196400x379.jpg&hash=84bc53da66a6ba2d4e2e892bf69a3946)

Results:

Disc center 0.52 T
1 cm distance 0.28 T
2 cm distance 0.14 T
edge up to 0.6 T
side part of the disc (curved) 0.06 T
Title: Re: Magnetic field measurements on disc magnets
Post by: Mads Barnkob on July 01, 2018, 10:30:49 AM
I got a N42 disc round neodymium magnet, 50 mm diameter and I think its 25 or 30 mm thick. I bought it to demonstrate induced currents in a copper pipe, where the magnets fall is slowed down by the induced current and resulting magnetic field in the pipe. It was "rated" for being able to lift 140 kg.

I really got to get around to do a video on that :)