[links] OT

[Karel Kulhavy]

On Fri, May 04, 2007 at 12:39:26PM -0500, Kali wrote:
> Dear Karel:
> Yes, capacitors are switched in with triacs, but only after the turbine
> has reached maximum power - extra excitation is used to stall it.
> But the first means of controlling excitation is with multiple shunts
> and multiple secondary windings in the transformer.  These add lagging
> vars with shaded coils

What are shaded coils? Is it like shading rings on split-pole single phase
induction motor?

CL<
> and also leading vars by pushing up the generator voltage as power
> increases. It is a curve matching fiddle.
> Regards
> Kali
> 
> On Sat, 28 Apr 2007, Karel Kulhavy wrote:
> 
> > On Tue, Apr 17, 2007 at 04:51:29PM -0500, Kali wrote:
> > > 
> > > On Tue, 17 Apr 2007, Karel Kulhavy wrote:
> > > > What computer are you using? I am building an exercise bike generator and I
> > > > want to connect a PC or laptop to mitigate the unhealthy lifestyle connected
> > > > with computer-based occupation. 
> > > ...I was talking about an old 486 VESA bus no-name, but I think the go
> > > would be a laptop so that its battery would act as a UPS between pedal
> > > strokes.
> > > > 
> > > > At the moment I have a 60W SEIG (self excited induction generator) from an
> > > > ordinary 60W three phase asynchronous motor, which can light a 60W light bulb
> > > > (though not full shine) when powered by an electric drill.
> > > > CL<
> > > ...Amazing! I built just such a rig many years back. I did not know that
> > > you called the generators SEIG, even after doing years of research work on
> > > them.  see http://www.flowtrack.com.au
> > > The biggest problem I had was that the pedal generator had a horrible
> > > speed/torque curve and tended to go through excitation/de-excitation
> > > cycles as you pedalled harder and softer. This could be sorted out by
> > > either having more flywheel on the cycle, or by fiddling the generator
> > > voltage with a transformer or star/delta rewire if possible. 
> > 
> > How does your Flowtrack controller work? Do you have multiple capacitors that
> > are switched on and off to change the excitation capacity?
> > 
> > CL<
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> > 
> > 
> > 
> 
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