visual effect of capacitors


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GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127
Posted: 03:38pm 04 Jul 2008      

Hi readers,

PS edit:3/12/08


An important consideration that should be noted, is that the capacitor coupling arrangements are charge pumps, and as such, these should not be left unloaded. An unloaded system, even if the mill is only producing a few ACvolts, has the potential to still produce hundreds of DC volts on the output over time.

Due care should still be taken and treat all connections as lethal.



I have helped Dennis with some recording of CRO outputs of an 80SP in star configuration at 350rpm.

I have arranged the pics as comparisons. 200uF was placed between each set of windings. readings were taken unloaded and supplying a 24V battery at a constant voltage. All vertical scales are 10V/div.

this pic is the unloaded output waveform without and then with capacitors before the rectifier from the star point as reference.


this pic is the loaded output waveform without and with capacitors before the rectifier from the star point as a reference.


this pic is the loaded output that the battery sees. This is between bat -ve and the winding. this is across the bridge rectifier.


The results show clearly the voltage gain. The loaded current at 350rpm increased from 3A to 11A with capacitors.

The capacitors do significantly reduce the cutin speed. This will allow a particular windmill with a high cutin to produce current at approx 2/3 the rpm.

cheers, Gordon.

Edited by GWatPE 2008-12-04
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