|
Tractor Talk Discussion Board |
Re: Re: Re: low mod 12v conversion
[ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by Bob M on February 25, 2004 at 08:23:57 from (165.170.128.66):
In Reply to: Re: Re: low mod 12v conversion posted by buickanddeere on February 25, 2004 at 06:07:20:
Hey B&D - I gotta disagree with your analysis! It is correct ONLY when resistance a circuit is increased by the same percentage as the voltage. However in this situation the field winding resistance remains unchanged. By Ohm's law E = I*R (rearranged I = E/R), when voltage is doubled and resistance stays constant, current is doubled. Therefore since heating is given by W = I^2*R, when you double the current you QUADRUPLE the heating. Or calculate it another way: Heating is also given by W = I * E. By feeding the fields 12 volts you have doubled BOTH voltage and current. Consequently you have quadrupled the heating. Real world experience: A couple years ago a buddy did a quick 12 volt conversion on an old Minne Mo by simply mounting a 12 volt regulator and changing the battery. It worked, but he observed the generator case became unusually hot after running a while. The system worked for several months, then the generator just quit. When we opened it up afterward we found the field windings' insulation (lacquer and tape) charred and burned - obviously from prolonged overheating.
Follow Ups:
Home
| Forums
| Order Support
Today's Featured Article -
Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
... [Read Article]
Latest Ad:
For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
[More Ads]
Copyright © 1997-2026 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|
