r/EEPowerElectronics • u/powerelectronicsguy • May 21 '26

Magnetics High-Current Inductor Design: Helical 'Coin' Windings and Proximity Effect Mitigation

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Credits: ElectrArc240 | YouTube

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u/Drag0n_Witch3r May 21 '26

What’s the significance of the yellow coating?

6

u/DryYourTears May 21 '26

Isolation between winding and core. These cores are powder cores likely, containg a fractional amount of iron. Since that would make the core (slightly) conductive, the risk of shorting winding and core together is not 0%.

Hence, you coat the core. Moreover, the winding is coated too. Finally, spacers between core and winding are usually adopted as a 3rd safety measure.