Posted by greyfoxxca on November 25, 2010 at 19:46:42 from (137.186.159.24):
In Reply to: foxxy... posted by Bob on November 25, 2010 at 10:19:34:
Bob
well you are talking about the copper losses in the field coils causing the heating. To increase the magnetic flux in the field windings for the increased 14 volt output the current flow would have to be higher. To double the voltage the field magnetic flux would have to be higher. This would take increased field current flow. You are correct.
Well the speed of the armature will also change the output voltage also. The rate at which the magnetic lines are being cut and/or the density of the magnetic flux sets the output voltage of the armature. Could the generator rpm be increased?
While if you have all your lights on and running the speed of the engine low you could run into heating issues. If your power requirements are low, field current needs would be lower. at higher speeds the field current drops for the same power output.
I am not saying this would be the best way to change over 6 volt system to 12 volt but to keep it all original this might be a thing I will try. If your power needs are not high it should work. If you work at night or need lights etc , this might not work for you.
I will also point out that because armature current is one half of what it would be at six volts, the generator fields temperature rise may not be a pronounced as you may think.
has anyone on the board actually done this? What were your results? I know it has been done by many people who know what they are doing.
also would like to know what the differences are between the six volt windings and 12 volt. If there is twice the coils I am guessing you are picking up twice the resistance with twice the copper losses and heating.
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