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Tractor Talk Discussion Board

Re: Tractor starters and magnetic fields


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Posted by MarkB_MI on January 11, 2012 at 09:09:57 from (198.208.251.23):

In Reply to: Tractor starters and magnetic fields posted by teddy52food on January 11, 2012 at 08:29:08:

Teddy, it's been awhile. We've all missed your "interesting" posts. Allow me to comment:

"The starter spins it over much faster, but the amps are less."
No. The starter spins faster because it is producing more torque. And it is producing more torque because there is more current going through it at 12 volts than at six. To elaborate, the starter voltage equals the back EMF plus IxR, where I is the starter current and R is the starter's internal resistance. Since back EMF increases with motor speed, the higher the battery voltage the more EMF the battery can overcome. Hence, with a 12 volt battery, the starter current is greater at any speed than with a six volt battery. More current translates to more torque.

"Then take the 2 6 v & hook them up in paralell to double the amps"
No. The current is not doubled when you connect batteries in parallel. There is some increase in current because the internal resistance of two batteries in parallel is half that of a single battery. But it is not doubled. In order to double the current, you need to double the voltage (more or less).

"So the wattage is less but it is getting more done."
No. Not unless you want to redefine "power" and "work". Which of course you and your pal Crackpot Joe do on a regular basis.

"E=MC squared."
It's always good, when you're trying to make a nonsensical argument, to throw in an irrelevant formula from a theory most people don't understand. Point goes to Teddy!


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