On Thu, 27 Sep 2007 08:18:39 -0400, Brian Lawson
wrote:

On Wed, 26 Sep 2007 23:01:42 -0400, clare at snyder.on.ca wrote:

SNIP

Brian, those 300 and 400 AMP DC generators were very common military
surpluss for many years, and they made EXCELLENT electric motors. Some
airplanes even used "starterators" - starter generator cominations.

My 400 amp generator that I used in the Fiat put out about 20 HP on 48
volts without field weakening, and about 80 for short periods with
field at about 15%. I limitted my weakening to about 30%, +/-. It
would get the heavy little fiat up to 50mph with the 400 amp breaker,
which prevented me from getting more than about25 or mabee 30 HP out
of it before tripping.


Hey Leo and Clare and RoyJ,

Wow!! Sounds impressive!! I stand corrected. Sorry.

One thing that should be emphasized if Leo uses one as a motor is the
need for some sort of a minimum field current protection or fixed
shunt so it can't get a runaway.

Take care. Good luck, and Leo, please post pix if you do get it
running.

Brian Lawson,
Bothwell, Ontario.
The aircraft generator "commutating feild" is a permanent shunt that
does somewhat limit the no-load speed (at 24 volts) Running higher
voltages could possibly get high enough RPM to "unwind"

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