25-04-2019, 09:17 AM
(25-04-2019, 06:30 AM)Bob Culver Wrote: It beats me. In conditions of low system voltage ie flat battery and lights on would expect the regulator to apply near continuous field feed which at 12v, would result in field current more than double normal (4X heating effect). How hot does field get on steady 12v? Maybe can take it (I have tried a steady 9v and does not get very hot.)
An additonal 1.5 ohm or so in the field lead would seem prudent.
Bob, if the additional 1.5 ohm resistor is just external, and heating up the world, it is not a very efficient use of that precious electricity we are trying to produce. Better is to have higher resistance field windings. That way less current flows to create a field, but none of it is wasted.
Higher resistance field coils are now available, though not cheap...
https://www.eics-products.co.uk/shop/cla...eld-coils/
and a suitable electronic regulator is here... https://www.eics-products.co.uk/shop/cla...eld-coils/
Apparently this regulator will cope with the original low resistance field coils, but works better with higher resistance field coils.