"Winston" wrote in message
...
Ed Huntress wrote:
wrote in message
...
Ed Huntress wrote:

(...)

Used as generators, they need a way to provide initial excitement to at
least one of the coils. There were various setups for this, including
relatively weak magnetized armatures, start batteries, and so on. Once
they
were generating current they typically were designed to be
self-exciting.

Via parallel capacitors?
http://www.qsl.net/ns8o/Induction_Generator.html


--Winston

That's a different situation, Winnie. Those are being used to provide
initial excitement to *induction* motors used as generators. That's a
tricky
thing, and I didn't answer EA's question about three-phase induction
motors
because it's something with which I have no experience.

But it may well be used to excite some all-wound DC generators, too.
'Don't
know. They were mostly before my time.

Three phase induction? This looks promising:
http://ronja.twibright.com/exciter/

Though the most I could ever accomplish was 70 W for half an hour
a day, so I don't expect to run my house from one of these.

(That parallel FET Q1 cannot be the best possible way
to regulate output power!) Yeesh.


http://www.frenchriverland.com/Motor...th_UK_1994.pdf

--