Electronics > Beginners
Does the inductor magnetic field effect the nearby components??
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Neomys Sapiens:

--- Quote from: HB9EVI on July 24, 2018, 02:20:38 pm ---you have to use conductive material for shielding, plastic whatsoever won't do the job. there special shielding boxes which are solderable - but just this alone won't do it either; you have to lay out the pcb appropriatelly for good shielding results; just packing a toroid in a shielding box will not do it

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Not only conductive, but definitely metallic! Magnetic shielding is achieved by providing a preferred path (of higher permeability) to the magnetic field, so Al:ok, Fe:better Hiperm/Mu-Metall: best.
Adhith:

--- Quote from: HB9EVI on July 24, 2018, 02:20:38 pm ---you have to use conductive material for shielding, plastic whatsoever won't do the job. there special shielding boxes which are solderable - but just this alone won't do it either; you have to lay out the pcb appropriatelly for good shielding results; just packing a toroid in a shielding box will not do it

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Thank you for your reply sir. I was under the assumption that non conductive materials are usually used to the prevent the penetration of magnetic field since a pair of bar magnets are often separated by a piece of wood.
Adhith:

--- Quote from: FlyingHacker on July 24, 2018, 04:24:05 pm ---The type of inductor will also have an effect on the amount of adjacent component interference. Torroids generally keep their fields more contained. You often want to put the inductors at right angles to each other as well. The ARRL Handbook covers these topics quite a bit, as many radio and amplifiers contain these larger components.

Even adjacent traces can cause mutual inductance.

https://www.electronics-tutorials.ws/inductor/mutual-inductance.html

https://pdfserv.maximintegrated.com/en/an/AN4636.pdf

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Thank you for your help Sir. I'll read the article that you have suggested to have a better idea.
Adhith:

--- Quote from: schmitt trigger on July 24, 2018, 04:35:35 pm ---This is only a qualitative test, but can help you visualize the relative amount of stray fields. For EI-cores, it is surprising the amount of material which is attracted to the gap.

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Thank you very much Sir for your valuable reply. however the pi filter is already made and the caps are soldered to it as well. So I guess i cant do this experiment. However I'll conduct a similar test with another inductor in my shelf to see the results.
Neomys Sapiens:
About which frequencies are we talking here? I assume from your filter values that it is DC cleanup from mains ripple and other smut.
I had to redesign a power amplifier for instumentation which suffered from magnetic stray fields.
The guy who did it originally had thought that using a toroid transformer, whose main advantage is generally said to be it's low stray field, was already enough of a precaution.
I rearranged the elements within and threw out the aluminium chassis mounting plate and had one of steel made. I placed the transformer below and made sure that above it was only the low-impedance part.
Zhe effects were gone without a trace and I hadn't touched the circuit or PCB.
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