Question in permanent magnet calcalutions
Question in permanent magnet calcalutions
(OP)
Hello, I have an Alnico magnet with its demagnetization curve, Br & Hc. It is a brick with well known dimensions.
I want to do some calculations-simulations.
How can i take from this magnet a 100mT magnetic field?
Thanks in advance.
I want to do some calculations-simulations.
How can i take from this magnet a 100mT magnetic field?
Thanks in advance.





RE: Question in permanent magnet calcalutions
http://www.dextermag.com/CalculationList.aspx
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RE: Question in permanent magnet calcalutions
1) Decide where (relative to the magnet) you need the 100mT field
2) Use one of the web-based calculators (such as http://www.dextermag.com/CalculationList.aspx )and input the appropriate values. For Alnico, it'll only be an estimated value since the field calculator doesn't directly factor in the Hc value.
If you need a uniform 100mT field, or anything more complicated, either contact the vendor that supplied the magnet (for engineering support) or use FEA.
RE: Question in permanent magnet calcalutions
It is discussed here:
http://en.wikipedia.org/wiki/Helmholtz_coil
I see they show the uniformity of the field with distance along the axes at the exact center of the coil. Does anyone know how it changes as we go outside that center?
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RE: Question in permanent magnet calcalutions
The rule of thumb is the central 1/3 of the volume is uniform.
As an FYI: While Helmholz coils are terrific for producing uniform magnetic fields, they generally do not produce very large magnetic fields.