Phil said:
** Not so.
GOSS is high grade transformer steel and the kind used for toroidal
cores is better than E-cores use. No E-core tranny made has the
extraordinary low magnetising current of all toroidals or good C-cores.
From the Acesita website:
http://www.acesita.com.br/eng/interno.php?area=faq_silicio
Q: What is the main difference between the grain oriented (GO) and the grain
non-oriented (GNO) silicon steels?
A: The main difference between the GO and GNO steels is in their crystal
strucuture. GO silicon steel has a texture called Goss, in which the
crystals are arranged in the direction of the easiest magnetization
(direção [001] - cube's adge), parallel to the rolling direction and to the
cube's diagonal plan (110) and parallel to the plate's plan. This kind of
structure turns the GO steel into a material with excellent magnetic
characteristics in the rolling direction and makes it suitable to the use
in static cores where the magnetic flow is similar to the rolling
direction, such as the transformers. GNO steel doesn't have a texture and
it shows similar magnetic characteristics in all directions. This makes it
siutable to the use in machines where magnetic flow is constant changing,
such as electrical motors and power generators.
** Not so.
It runs along the "I" piece in the oriented direction ALSO.
Yep thats true but it still runs at 90 degrees to the grain for
about 30% of the magnetic circuit which makes it not as good as toriodals.
** C core and toroidal cores have little or NO air gaps included -
this
is the real secret of low I-mag.
What steel E-I mains power transformers have airgaps Phil?, Maybe
in something with a DC current like a class A audio output transformer.