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Farmall & IHC Tractors Discussion Board

Re: Generqtor differences


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Posted by Janicholson on November 28, 2012 at 18:33:36 from (67.72.98.45):

In Reply to: Re: Generqtor differences posted by John T on November 28, 2012 at 05:58:01:

Hear is a bit of additional content. In an operating (rotating and producing voltage) two brush generator, a probe could be stuck into the end frame to touch the commutator bars near the Armature brush. This sample voltage would be highest near the position of that brush, and taper to nothing at 90 degrees from the Armature brush.
It is this voltage that is used for the field circuit in a three brush gen. That adjustability allows a farmer (or technician) to taylor charge rate to the use of the tractor. If there were no lights on the tractor (or other equipment like a stationary engine) the field current was unregulated through a fixed resistance wire wound resistor (usually in the same housing as the cutout), and tweaked with the third brush. If the tractor had lights, the charge rate was controlled by a (same resistance) fixed resistor on the light switch, and a direct ground of the field allowing the operator to choose to recharge the battery faster if many starts per hour were being made, or for cold weather operation for better recharging when the battery performance was compromised by low temps. The same switch shaft was used to turn on the lights, and at the same time keep the gen field full grounded. Jim


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