On Sun, 13 Jul 2003 00:24:40 +0100 "Ian Iveson"
wrote:

One thing I have just begun to wonder is how EI-core folk deal with
the directional property of GOSS. A wrapped core like a torroid or
a C can complete the magnetic circuit with all the grain aligned
with the field. But an EI transformer has the grain in the wrong
direction down the I and down the side of the E.

EI cores are punched from strips of sheet steel slit to exactly the
right width. The dies are arranged such that the 2 Es face one another
leaving slots which become the Is. This means that the field can be
parallel to the grain in all the areas of the EI core except for the
main body of the E. But if you look at it, you will see that the flux
density in this area is about half that of the center leg.

The advantages of GOSS only make a difference where the flux density
approaches saturation, so this approach takes care of us.

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Jim Adney
Madison, WI 53711 USA
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