AFCA Forums Home
Home Search search Menu menu Not logged in - Login | Register

 Moderated by: Steve Cunningham, Stan Adams, Rod Rogers
New Topic Reply Printer Friendly
Emerson Speed Coil  Rate Topic 
AuthorPost
 Posted: Sun Jul 19th, 2020 08:33 pm
  PMQuoteReply
1st Post
Mark Olson
AFCA Member
 

Joined: Thu Nov 22nd, 2018
Location: Baton Rouge, Louisiana USA
Status: 
Offline
The speed coil in my un-restored 27666 smoked one evening as I was enjoying the fan a few weeks ago.
I un-wound the coil and there were several  places where the windings had fused together making it difficult to get an accurate turns count. Does anyone know the actual turns count? Here is what I came up with:

Does this look reasonable?

Back To Top PMQuoteReply  

 Posted: Mon Jul 20th, 2020 02:38 am
  PMQuoteReply
2nd Post
Tom Newcity
AFCA Member


Joined: Sun Nov 27th, 2005
Location: Fort Smith
Status: 
Offline
I'll check my notes tomorrow.  Diagram looks good.

Back To Top PMQuoteReply

 Posted: Mon Jul 20th, 2020 01:29 pm
  PMQuoteReply
3rd Post
Rick Huckabee
AFCA Member


Joined: Mon Jun 9th, 2008
Location: Lufkin, Texas USA
Status: 
Offline
Sounds close, I like to use 100-100-200 for most all Emerson fans.

Back To Top PMQuoteReply  

 Posted: Mon Jul 20th, 2020 01:48 pm
  PMQuoteReply
4th Post
Tom Newcity
AFCA Member


Joined: Sun Nov 27th, 2005
Location: Fort Smith
Status: 
Offline
Took me awhile to get moving this morning.  Anyway, I checked my notes and this is what I found.

Rebuilt a 27666 speed control choke a few years back and counted the turns with 26 gage (.0155") wire at:
  1-2    60   LO
  3-4   110  MD
  5-6   251  Phase Shift 
Your numbers may be good for 25 gage.  It is not uncommon for Emerson to use different specs within the same model number.
 



Last edited on Mon Jul 20th, 2020 01:55 pm by Tom Newcity

Back To Top PMQuoteReply

 Posted: Mon Jul 20th, 2020 07:25 pm
  PMQuoteReply
5th Post
Mark Olson
AFCA Member
 

Joined: Thu Nov 22nd, 2018
Location: Baton Rouge, Louisiana USA
Status: 
Offline
Thank you Tom and thank you Rick. It appears that my turns count is probably accurate. I am a bit hesitant to venture too far from it, given the wire size that was used. What gauge are you guys winding with?


Edit: Tom, I see that you used 26 awg for that coil. I am not too clear on number of windings and their influence on fan motor operation, but it would seem that more windings would cause greater speed difference, at least on low and medium. The phase shift winding, it would seem, would need to be fairly consistent for a given motor. Unless the transformer stack varies among models.

Last edited on Mon Jul 20th, 2020 08:29 pm by Mark Olson

Back To Top PMQuoteReply  

 Posted: Mon Jul 20th, 2020 09:47 pm
  PMQuoteReply
6th Post
Tom Newcity
AFCA Member


Joined: Sun Nov 27th, 2005
Location: Fort Smith
Status: 
Offline
I used 26 gage because that is how the original choke was constructed.  That choke was probably made for a specific motor winding configuration in that fan.   

An increase in windings could decrease the speed if there is enough load.  Load meaning the amount of work to move the blades.  I sometimes increase windings along with an increase in blade pitch for greater speed separation.

Back To Top PMQuoteReply

 Posted: Tue Jul 21st, 2020 12:41 am
  PMQuoteReply
7th Post
Mark Olson
AFCA Member
 

Joined: Thu Nov 22nd, 2018
Location: Baton Rouge, Louisiana USA
Status: 
Offline
Tom Newcity wrote
I sometimes increase windings along with an increase in blade pitch for greater speed separation. Roger that



Back To Top PMQuoteReply  

 Posted: Thu Jul 30th, 2020 11:08 pm
  PMQuoteReply
8th Post
Mark Olson
AFCA Member
 

Joined: Thu Nov 22nd, 2018
Location: Baton Rouge, Louisiana USA
Status: 
Offline
An update:
I rewound the choke and learned a lesson.


Lesson learned:
Always measure the failed coil before destroying it to count turns.


Although I managed to re-assemble the choke, it was a bit tight. The original wooden shims no longer fit. I tried to calculate the dimensions of the coil including the fish paper and the friction tape, but actual measurements would have been much better. I think that the turns count of this coil is what it is because that is the physical limit using period correct materials.







Back To Top PMQuoteReply

Current time is 08:32 am  
AFCA Forums > Antique Fan Collectors Association > Pre-1950 (Antique) > Emerson Speed Coil Top



Beige Theme By: Di @ UltraBB
UltraBB 1.17 Copyright © 2007-2008 Data 1 Systems
Page processed in 5.0543 seconds (97% database + 3% PHP). 29 queries executed.