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 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< > _______________________________________________ > links-list mailing list > links-list@linuxfromscratch.org > http://linuxfromscratch.org/mailman/listinfo/links-list > > > _______________________________________________ links-list mailing list links-list@linuxfromscratch.org http://linuxfromscratch.org/mailman/listinfo/links-list
