 Inductor saturation current
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GeordieBoy
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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
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Yes, the total air gap is the sum of all the gaps in the magnetic path. But...
It is best to only gap the centre limb of ETD-cores and E-core sets, or the centre post in things like RM-cores and pot-cores as this minimises the external magnetic field. The outer most limbs of the E-core and the shell of an RM or pot core is not normally gapped.
However, for prototyping you divide the total air gap into two. You put half of the air-gap in the centre limb, and half of the air-gap in the outter limbs.
So just to clarify one last time. If you have an E-core set and put 1mm gaps in the centre limb AND each outter limb. The total air gap length is 2 x 1mm = 2mm. Not 3mm because only half of the total flux takes each of the two external limbs as its return path. I hope that is clear.
-Richie,
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