Re: automotive alternators, three phase, RSG

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dr. Duncan Cadd by way of Terry Fritz <twftesla-at-uswest-dot-net>" <dunckx-at-freeuk-dot-com>

Hi Jim, All!

Date: 26 January 2001 05:33
Subject: automotive alternators, three phase, RSG


>Original poster: "Jim Lux by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>
>
>It occurs to me that an interesting experiment (I'm a great
one for ideas
>for experiments, but I rarely actually get a chance to try
them) would be
>to rig up a big motor (gas, electric, hamster wheel, it
matters not)
>driving a 3 phase alternator (as from a car, with the
diodes removed) and a
>rotary spark gap on the same shaft.

<snip>

This I like.  It suggests that "high" frequency ac power may
be cheap and readily available.  Most of the stuff I have on
spark transmitters, where it relates to the commercial ones,
states that the mains supply was 400, 500 or 800 cycles,
which means all manner of benefits accrue.  I've fancied
getting hold of a 400 or 800 cycle rotary converter to play
with, but I have so many other things on the boil at the
moment I scarcely have time (and I have even £€$$ of the
folding stuff) so a cheap way of doing this appeals. I also
did not realise that auto alternators are three phase - is
this universally so - does that hold for truck alternators
too?

Anyone know if it's OK to use standard 50/60 cycle
laminations at these frequencies?  I know eddy losses will
be up, but don't know how acceptable this is.  Any list
members with 400-800c/s power experience?  I do know that
higher frequency ac uses less turns per volt for the same
core size, I may even have reference books on the shelf with
the necessary calculations in them.

Dunckx