UK Stationary Engine Forum
 

Go Back   UK Stationary Engine Forum > Main Engine Section > Engine-Only Stuff > Generators

Reply
 
Thread Tools Display Modes
Old 16-03-18, 06:21 PM   #1
raggy 1
Senior Member
 
raggy 1's Avatar
 
Join Date: Sep 2008
Location: IN A HOUSE IN NOTTS
Posts: 760
Default 12volt Lucas dynamo

Hi folks,am I right in thinking that if I reverse the brush holders I can get it to generate in the opposite direction to the normal? Thanks
raggy 1 is offline   Reply With Quote
Old 16-03-18, 08:48 PM   #2
ListerHA2
Senior Member
 
ListerHA2's Avatar
 
Join Date: Oct 2011
Location: Cardiff
Posts: 497
Default

Direction of rotation or direction of polarity?
ListerHA2 is offline   Reply With Quote
Old 16-03-18, 10:01 PM   #3
raggy 1
Senior Member
 
raggy 1's Avatar
 
Join Date: Sep 2008
Location: IN A HOUSE IN NOTTS
Posts: 760
Default

Read on here that all thats needed is to change the brush holders over so it will generate running anti clockwise(pulley side) .Is this right?
raggy 1 is offline   Reply With Quote
Old 16-03-18, 11:10 PM   #4
Hornet 6
Forum Supporter 2013
 
Hornet 6's Avatar
 
Join Date: Apr 2016
Location: Rochford
Posts: 2,100
Default

Before messing about with it, why not put a figure 8 in the belt just to see if it works ?

Neil.
__________________
Wolseley WD 8, Stuart Turner P5, Maytag 92, Kubota KND3, Maytag 72, Lister D Spec 11.
Hornet 6 is offline   Reply With Quote
Old 16-03-18, 11:43 PM   #5
somian
Senior Member
 
Join Date: Jul 2009
Location: Box End, near Bedford
Posts: 150
Default

From what I remember one brush holder is riveted to the end plate directly, and the other insulated from it. so it might be easier to reverse the field connections, if only because the field is about 3A, rather than 20 plus. Shunt wound dynamos only generate with one direction of rotation; spin them the other way and they may destroy their residual magnetism
somian is offline   Reply With Quote
Old 17-03-18, 09:56 AM   #6
Hurric
Member
 
Join Date: Nov 2013
Location: South Bucks
Posts: 44
Default Dynamo

Yes that is what to do. One end of the field is riveted through the yoke the other end of the field comes out the comm end bracket as the small terminal. These wires need to be swopped.
Hurric is offline   Reply With Quote
Old 17-03-18, 05:41 PM   #7
Lucien Nunes
Forum Supporter 2011
 
Lucien Nunes's Avatar
 
Join Date: Sep 2009
Location: London
Posts: 892
Default

The specific requirement is to reverse the field with respect to the armature. At the moment one end of each is earthed to the case - provided you swap the live and earthy ends of one or t'other, the effect is the same. Obviously rotating the brush bracket through 180 while keeping the same brush earthed, is equivalent to earthing the opposite brush. After reassembly, you may need to flash the field with a battery to reverse or restore the residual magnetism before it will generate.

Or, find another enthusiast who has the reverse problem, and swap dynamos!
__________________
Anybody caught running Listers on veg oil will be made to eat a plate of chips cooked in red diesel
Lucien Nunes is offline   Reply With Quote
Old 19-03-18, 08:43 AM   #8
swarf
Senior Member
 
swarf's Avatar
 
Join Date: Feb 2009
Location: Nr.Helston,Cornwall
Posts: 199
Default

A simple way is to end for end the dynamo so the belt pulls in the opposite rotation.
But that may make the whole thing too big and sprawling with a big overhanging bracket. Just a thought.
__________________
Ford 2712E marinised 1979; Lister CS 8-1 S.O.M. 1958; and Lister RL1 1958 & SL1 generators. Mermaid Marine Turbo Four 1979.
swarf is offline   Reply With Quote
Old 19-03-18, 01:37 PM   #9
Hornet 6
Forum Supporter 2013
 
Hornet 6's Avatar
 
Join Date: Apr 2016
Location: Rochford
Posts: 2,100
Default

Quote:
Originally Posted by swarf View Post
A simple way is to end for end the dynamo so the belt pulls in the opposite rotation.
But that may make the whole thing too big and sprawling with a big overhanging bracket. Just a thought.
Easy to do for a WD, just drive the dynamo from the other side, plenty of room for a couple of V pulleys behind the starting handle dog.

Neil.
__________________
Wolseley WD 8, Stuart Turner P5, Maytag 92, Kubota KND3, Maytag 72, Lister D Spec 11.
Hornet 6 is offline   Reply With Quote
Old 21-03-18, 11:41 PM   #10
raggy 1
Senior Member
 
raggy 1's Avatar
 
Join Date: Sep 2008
Location: IN A HOUSE IN NOTTS
Posts: 760
Default

Thanks fellers.
raggy 1 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 03:27 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.