teddy52food wrote [quote="On a test bench, if you connect the field to the battery terminal it will charge. Just like a generator, it has residual magnetism. It may charge on a tractor too but may take a while. Never tried it.[/quote]
From what I have read a DC generator will self excite because of residual magnetism in the field poles. The initial current formed must reinforce the field in the poles in order for any current to build. As the armature continues to spin emf builds up in it as long as the voltage in the armature exceeds the voltage drop across the windings of the field coils.
Hey it sounded ok when I read it.
I skipped some of the verbage to advance the plot.
I still think you have to remove the + terminal from the battery so that it does not sink the resulting emf. It would help if you had an electrolytic cap across the output. Once cranked you need a resistor in series to the battery to keep the engine running and slowly charge the battery or as said earlier the battery should be put on a charger back at the barn.
Also would there be much residual magnetism in tractor sitting in the field for five years as olddog said?
I guess you could point it North South and beat on it lightly for a few minutes with a tire iron.
This post was edited by Deutz Lover at 21:35:20 09/09/15 5 times.
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