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Re: Re: Re: Re: Farmall generator
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Posted by buckeye al on January 21, 2000 at 14:55:03 from (208.24.179.201):
In Reply to: Re: Re: Re: Farmall generator posted by Matt on January 21, 2000 at 07:43:43:
All generators must have a magnetic field for the armature to rotate in before they can produce any output. The generators on these old tractors rely upon what is called residual magnetism to get them started. The field pole pieces are made of soft iron which easily "remembers" the polarity of the last magnetic field they had impressed upon them. When you polarize the generator, you are telling one pole piece it is the NORTH pole and the other that it is the SOUTH pole. When the engine starts the armature turning in this weak magnetic field it causes a little pit of field current to flow which causes more magnetic field strength which causes more field current which causes more ...... you get the idea. It is a snowball on a fast downhill roll 'till the regulator or resistances cause it to level out. Other guys mentioned grounding the field terminal of the generator. They are right! NO healthy standard tractor GENERATOR will charge the battery if the field wire is NOT connected. Furthermore the regulator MUST be well grounded for it to properly control the generator. The regulator varies the filed ple current to vary the voltage at the armature post. Older tractors that had only the cutout relay were most often plagued by high resistances in this field current path. The field current has to leave the generator looking for ground. It was supposed to get to ground through the light switch to the switch box cover to the box frame to ground. If the light switch was not well connected to the cover or if the cover was not well grounded to the box, these tractors would NOT charge! Hope that helps.
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