Trying to make a magnetizer

  • Thread starter PolyDerek
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Main Question or Discussion Point

Hi everyone.
I'm trying to make a simple magnetizer myself.
And I have decided to use a C-shape core and the coil to produce the B field.
To magnetize a magnet the maximum B field we designed is 5 Telsa in air gap.
We have already tested the design in software Maxwell, we found that it requires N*I > 10000A !!
That means if we set the current as 1A, we need to make at least 10000 turns of coil.
How to make B field as such large value in proper way?
Our design is a typical dc magnetizer, would it be better if we adopt capacitor impulse magnetizer circuit?
And what is the size of the silicon steel core for it?
 
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Answers and Replies

  • #2
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First, to get 5 Tesla in a magnetizer requires working with magnetic cores well beyond saturation. 5 Tesla is about 3 times the saturation in the best transformer iron, and 10-20 times the best ferrite, and if the magnetizer is pulsed, eddy currents in the core need to be considered. So to first approximation, the magnetizer design should proceed as though it were an air core design.

To get a product (B field times path length λ in air), the amp-turns required is about

NI = Bλ/μ0 = 5 Tesla x 0.15 meters/ 4π x 10-7 = ≈ 500,000 to 600,000 amp turns.

Review your calculations and simulations.

Bob S
 

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