Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Discussion Forum
:

3 Brush Generator

Welcome Guest, Log in or Register
Author 
Bill(Tx)

07-13-2000 11:08:23




Report to Moderator

Would the generator bracket that attaches to the front 2 cylinder head bolts be the same type used on 9N's? I'm looking to correctly restore the generator mounting for 1941. See pic.




[Log in to Reply]   [No Email]
llamas

07-13-2000 11:53:26




Report to Moderator
 Re: 3 Brush Generator in reply to Bill(Tx), 07-13-2000 11:08:23  
The set-up in your picture is correct for a third-brush generator. The tensioner assembly is correct, although I can't see the castle nut and cotter pin.

llater,

llamas



[Log in to Reply]  [No Email]
Old Ag

07-13-2000 13:59:34




Report to Moderator
 Re: Re: 3 Brush Generator in reply to llamas, 07-13-2000 11:53:26  
I didn't know about the tensioner set-up. What's it called and where do I get one?

Thanks,
Old Ag



[Log in to Reply]  [No Email]
Old Ag

07-13-2000 11:39:33




Report to Moderator
 Re: 3 Brush Generator in reply to Bill(Tx), 07-13-2000 11:08:23  
Bill,

I just put a 3-brush generator back on my '41 and the only thing holding it on are the brackets on the bottom (on top of the governor). N-board members convinced me that was the proper set-up, but I sure had to torque the "you-know-what" out of that bolt to get the generator to hold tension against the belt. I do like that nifty tension bolt/bracket on top of yours though, like the vent holes in the generator too.

By the way, if you can explain how the 3rd brush powers up the field windings feel free to tell me all about it. I'm stumped on that one.

Old Ag
'41 9N

[Log in to Reply]  [No Email]
Claus

07-13-2000 12:49:08




Report to Moderator
 Re: Re: 3 Brush Generator in reply to Old Ag, 07-13-2000 11:39:33  
Ok, lets start with the 2 brush generators. On the 2 brush generator the field is powered by connecting the high side to the armature and the low side is connected either to ground through the regulator or a resistance in series to ground. In the 3 brush generator, the high side is connected to the commutator via the third brush. Each segment further away from the output brush the voltage is lowered some. This is done through the adjustable brush. The low side of the field is always connected to ground. This does not afford any regulation but the output can be lowered somewhat in an attempt to keep the battery from overcharging. Obviously this system left a lot to be desired and the introduction of the voltage regulator was a quantum leap.
Happy Motoring
Claus

[Log in to Reply]  [No Email]
Old Ag

07-13-2000 13:56:40




Report to Moderator
 Re: Re: Re: 3 Brush Generator in reply to Claus, 07-13-2000 12:49:08  
Thanks for the info, but I don't see how you have a complete circuit? I was thinking there were two commutator segments for every armature winding. The + and - poles are 180 degrees from each other, and that explains why the positive and negative brushes are located on opposite sides of the commutator to complete the circuit through the armature windings. For the field, there's only one brush in contact with the commutator and nothing 180 degrees out. So the circuit would seem open, right? It would be like disconnecting the ground on a battery and hooking up a load to the other terminal, nothing would happen.

I am definately not an expert on DC machines, just looking for somebody to set me straight. Thanks!:)

Old Ag

[Log in to Reply]  [No Email]
Claus

07-13-2000 14:32:53




Report to Moderator
 Re: Re: Re: Re: 3 Brush Generator in reply to Old Ag, 07-13-2000 13:56:40  
The low side of the armature is grounded through a brush as where the low side of the field is grunded through a ground connection. The armature is wound like taps on a transformer (many) Your paradigm is that all windings are seperate.
Happy Motoring
Claus



[Log in to Reply]  [No Email]
Old Ag

07-13-2000 18:52:09




Report to Moderator
 Re: Re: Re: Re: Re: 3 Brush Generator in reply to Claus, 07-13-2000 14:32:53  
Thanks Claus! Obviously, I've got me some book readin' to do on DC machines.

Thanks again.
Old Ag



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 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 Headquarters

Website Accessibility Policy