Farmall & IHC Tractors Discussion Board |
Re: Why Pos Ground
[ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by John T on August 11, 2005 at 12:38:26 from (66.244.90.73):
In Reply to: Re: Why Pos Ground posted by JT on August 11, 2005 at 07:43:37:
JT, youre right and I agree. As I said, small permanent magnet motors DO RUN BASS ACKWARDS if polarity is reversed. HOWEVER, DC Motors like most all tractor starter motors which have electromagnetic field windings (i.e. NOT permanent magnet fields) WILL RUN THE SAME DIRECTION EVEN IF REVERSED. The reason is to reverse the motor you have to change the N/S polarity orientation BETWEEN the Armature and Field (reverse current flow direction in either) which a simple polarity swap in an electromagnetic field motor doesnt accomplish. The reason reversing polarity in a permanent magnet motor makes em run backwards is cuz youre changing the magnetic polarity in the armature by reversing current flow direction while the permanent magnetic field stays the same. Clear as mud ??? John T retired electrical engineer
Follow Ups:
Home
| Forums
Today's Featured Article -
Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
Copyright © 1997-2024 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 |
|