classic car forum header
Classic cars forum & vehicle restoration.
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
How To Register     Posting Photographs     Privacy Policy     F/book facebook.com/oldclassiccar

Polarising dynamo and voltage regulator
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Electrical Restoration
Author Message
Sid



Joined: 20 Sep 2017
Posts: 23

PostPosted: Fri Sep 22, 2017 6:10 am    Post subject: Polarising dynamo and voltage regulator Reply with quote

I have this week bought a Lanchester LD10 that's been standing idle since the early nineties. I've cleaned the contacts in the voltage regulator and removed the corrosion from the wiring, had the dynamo out and cleaned the armature and checked the brushes and still it won't charge the battery. So I think I need to polarize the dynamo, I've seen many articles on the internet regarding this, some saying remove the wires from the dynamo, others not mentioning this. I've also seen articles where the voltage regulator has similar treatment, again some having the wires disconnected and others not. Electrics have never been my strong point so could someone run through the operation exactly how it's done please?
Thank you
Sid
Oops just realised this is in the wrong section
Back to top
View user's profile Send private message
ukdave2002



Joined: 23 Nov 2007
Posts: 3470
Location: South Cheshire

PostPosted: Fri Sep 22, 2017 7:29 am    Post subject: Reply with quote

It's worth checking first if they Dynamo has any output without current applied to the feild.

All you need to do is flash the field winding and this can be done with every thing else in place.

Flashing the winding simply polarises the dynamos fixed magnets.

Dave
Back to top
View user's profile Send private message Visit poster's website
Sid



Joined: 20 Sep 2017
Posts: 23

PostPosted: Fri Sep 22, 2017 8:56 pm    Post subject: Reply with quote

OK thanks for that...did it and it worked a treat
Back to top
View user's profile Send private message
jessejazza



Joined: 18 Mar 2009
Posts: 75

PostPosted: Thu Jan 11, 2018 1:28 am    Post subject: Reply with quote

ukdave2002 wrote:
...All you need to do is flash the field winding and this can be done with every thing else in place.

Flashing the winding simply polarises the dynamos fixed magnets.

Dave

I read this post as this is also a task I have to do shortly. What do you mean by "flash"? please.
Back to top
View user's profile Send private message
ukdave2002



Joined: 23 Nov 2007
Posts: 3470
Location: South Cheshire

PostPosted: Thu Jan 11, 2018 9:32 am    Post subject: Reply with quote

jessejazza wrote:
ukdave2002 wrote:
...All you need to do is flash the field winding and this can be done with every thing else in place.

Flashing the winding simply polarises the dynamos fixed magnets.

Dave

I read this post as this is also a task I have to do shortly. What do you mean by "flash"? please.


With the engine off, connect a wire to the "non earth" side of the battery, and with the other end of the wire touch the Field connection on the dynamo a few times (you may need to disconnect the cable thats connected to the field to physically get at the field terminal) . It will spark a little when you do this, the fixed magnets in the dynamo are now polarised. Smile

Dave
Back to top
View user's profile Send private message Visit poster's website
jessejazza



Joined: 18 Mar 2009
Posts: 75

PostPosted: Thu Jan 11, 2018 4:49 pm    Post subject: Reply with quote

Thanks - i see what you mean now.
Back to top
View user's profile Send private message
MikeG



Joined: 16 Sep 2013
Posts: 56
Location: Cheshire/Staffordshire Border

PostPosted: Thu Jan 11, 2018 11:35 pm    Post subject: Reply with quote

Thanks for the explanation,I also need to carry out this process(I think).
To find the"Field" or non field terminal do I need to trace the connector to brush circuit ?
Mike
Back to top
View user's profile Send private message AIM Address
ukdave2002



Joined: 23 Nov 2007
Posts: 3470
Location: South Cheshire

PostPosted: Thu Jan 11, 2018 11:56 pm    Post subject: Reply with quote

There are normally only 2 connections on a dynamo:

1) The main Dynamo output, this will be the larger terminal, normally marked D

2) The smaller terminal will be the Field windings, this is the terminal that gets "flashed"



Dave
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Electrical Restoration All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Forum T&C


php BB powered © php BB Grp.