Re: automotive alternators, three phase, RSG

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

Original poster: "Robin Copini by way of Terry Fritz <twftesla-at-uswest-dot-net>" <rcopini-at-merlin-dot-net.au>


Hi Duncan,

 Yes, truck alternators are 3 phase before all the diodes get to it, and
here is the good bit, the
leece-neville alts we run on our detroits produce almost -ALL- their power
at just above idle.....
i.e. 600 rpm!! They're rated at 180 amps/14v and the drive is almost 1:1 so
there is plenty of scope
for overdriving. These alternators should be almost throw-away in the USA
and the UK, the only
difference is that most European stuff is 24V.

Best Regards

 Robin.



Tesla list wrote:

> 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