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How to calculate saturation current of rod core inductor?

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T3sl4co1l:
Put in B = mu H and the amp-turns given.  Works just fine :)

Flux density is usually used for ferrites, where the air gap and therefore magnetization is variable, but distributed-gap cores (and ferrites with premade gaps) are often given in terms of amps.

What's "u as a function of r"?

Tim

XFDDesign:
But B = mu*H isn't very meaningful.

Properly, you figure out Phi  = Num_turns * Current / Reluctance
Given Reluctance = length of winding / (mu_i*mu_0*Area of core)
B = phi/Area_of_core, or
B= N * I * mu_i* mu_0 / length

Toroid, rod, or E-core it makes no difference.

The concern or consideration is then figuring out what the saturation value is for the given core (and how much your L moves proportionate to I).

Figure the typical 0.4 T, for 150A, your right-hand has to be less-than-or-equal to 0.0266

0.02666 = µi*µ0*N/len
When Tim suggests a low µi, that's a good tradeoff to get the L value you want, but you'll be fighting the N/len battle a fair amount. That current level is kind of a nightmare.

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