I want to create an inductor with a ferrite core of 2.2 mH, but I do not know the size of the core, the number of turns and the size of the wire. The maximum voltage and current of my work are 429 volts and 2 amps respectively . Thank you for introducing a document or book on the design of an inductor with a ferrite toroid core. Thanks for helping me.

know the size of the core, the number of turns and the size of the wire. Th e maximum voltage and current of my work are 429 volts and 2 amps respectiv ely . with a ferrite toroid core. Thanks for helping me. might be a good place to start. Two amps through 2.2mH is storing 4.4mJ, which is a fair bit. I've used RM14 cores for this sort of work. On the most heavily gapped core you'd need 117 turns to get 2.2mH which is 234 Ampere turns. The magnetic path length is about 1.9mm - the path throug h the cores is longer, but gets divided by the permeability of the core whi ch is about a thousand-odd - so you get to 123 Ampere.turns per metre (whic h if memory serves won't saturate the ferrite - but don't rely on my memor y). You've only got 0.58 mm^2 of wire area to carry your 2 amps, which might no t be enough. The coils could get too warm - and if the ferrite gets warmer than it's Curie temperature, it stops being ferromagnetic at all. You might well need a bigger core pair, which...

How to create an inductor 2.mH with a toroid core ferrite?

Jul 01, 2019 41 Replies

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John Larkin 7 years ago

Directly from them.

The stuff is roughly $1 per square inch. Digikey has similar stuff.

John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com

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whit3rd 7 years ago

Some precision power resistors were made with metal-film on porcelain tubes with V-groove helix windings; a grinding operation leaves metal in the grooves and you just stop the grind when the resistance is right. Look closely, you can see (under the paint) where the mass-produced 'coil' is.

Somewhere out there, a resistor manufacturer has the machinery to make your dream gizmo, you just have to find her/him. And convince the assembly line to electroplate conductor on top of the resistive metal layer.

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