In message 1357276846.8777.YahooMailNeo@web163801.mail.gq1.yahoo.com>,
Aaron akenai@yahoo.com> writes
>
>Is there a reason one dose not use aluminum?
>Aaron
Yes!
The stator core material has to provide a preferential (low reluctance
as it is called) path for the magnetic flux. Effectively the core pulls
all of the 'lines of force' into it, with (ideally) none left traversing
any air space.
The material for the core needs to have a 'soft magnetic'
characteristic, which means that it is the sort of material that is good
for electro-magnets. So if there is a winding around a core pole, the
pole will be strongly magnetised when current is flowing in the winding,
but the magnetic field disappears when the current flow stops.
'Hard magnetic' materials by the way are those used to make magnets,
which retain a magnetic field. (Known as 'high remanence' materials.)
--
Chris Morriss
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