Very low power dynamo (alternator actually).
"Jim Thompson" wrote in
message ...
On Sun, 27 Nov 2011 10:50:39 -0800, Fred Abse
wrote:
On Sun, 27 Nov 2011 10:28:17 -0800, John Larkin wrote:
Alternators like this are often designed with a lot of internal series
inductance. As speed increases, open-circuit terminal voltage
increases, but the series inductance impedance increases too, tending
to make them constant-current sources, ideal for driving light bulbs
at sorta constant brightness at various speeds.
What I was going to say.
I think there is an ancient patent somewhere about just that.
Well! Alternators _are_ current sources, but not for the reason
Larkin claims... no surprise ;-)
...Jim Thompson
That's all we need - the schoolyard bully just turned up!
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