×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Winding terminology etc

Winding terminology etc

Winding terminology etc

(OP)
General definitions for "conventional" and "consequent" winding are known, but there are differences in interpretation.
What exactly means the terms "conventional" and "consequent" winding?
Can both be single-layer and double-layer? Can both be lap and concentric?
And the most important question: how to calculate the distribution factor for the "conventional" and "consequent" winding? What is the difference in the calculation?
Please, see: here
Zlatkodo

RE: Winding terminology etc

Consequent poles could be double layer in a slot, but I do not see a reason.  They use the fact the magnetic pole of the wire is the opposite when traveling in the opposite direction (eg. Up-North, Down-South).  Of course all my experience is on wet wound motors, and we do not use consequent pole (only seen one manufacture of the type try, and that did not last long).

RE: Winding terminology etc

Hello Zlatkodo

I think the term conventional   is something created by the book writter. The term conventional is not ofen ussed, the technical terminology suggest use the terms   Standard or pole winding  and consequent pole winding.
"POLES The magnetic poles set up inside an electric machine by the placement and connection of the windings"
This two kinds of windings have the main difference in the group phase Qty and how are the groups connected,in the standard or pole winding the groups are twice than consequent pole and you connect the end of the first group with the end of the second but in Consequent poles you connect the end of the first group with the start of the second, for it when you draw a 12 groups 4 poles pole  winding  you  can see 4 poles in each phase,two north and two south, each arrow change of direction. But in a six group four pole consequent pole winding sketch  you see two norths and you can´t see the other south poles and  the other two souths poles are formed do to the magnetic field needs a retourn way.

Both could be lap or concentric.The standard or  pole windings are double lawer and consequent pole are usually single layer but you can have special designs.

Attached you will find a technicall information.

Best Regards

Carlos

 

RE: Winding terminology etc

(OP)
Hi, Carlos,
Thanks for your answer and interesting attachment.
Your description of consequent windings is generally accepted, but there still exists a dilemma.
 Look at this diagram with three different windings for 24 slots and 4-pole (shown is only one phase of the single-layer winding).
 1. - What is the distribution factor for each of these cases (A, B and C)?
 2. - By definition, windings A and B are consequent, C is the standard  winding. But B is concentric winding also. Whether  a factor is 1 or 0.866 or 0.966?
 3. - The question may be simpler: how to declare windings A, B and C and how to calculate the distribution factor for all three cases?
Zlatkodo



 

RE: Winding terminology etc

Hello Zlatkodo

The table has 4 columns,first one shows the coils per group, second :   Standard Windings (Not Concentric and no consequents), Third: consequent pole winding(Standard winding and consequent pole too)  and fourth: Concentric windings.

Diagram A is a Lap standard consequent 6 groups, span 1-7 with 2 coils per group so is standard, then the D.F from the table will be 0.866 (Third column-2nd row)

Diagram B is a concentric consequent 6 groups span: 6-8 with two coils per group, DF from table will be 1.0 (Concentric windings: The D.F is always equal to 1.0)

Diagram C is a lap standard ( pole) winding, 12 groups, span 1-6, 1 coil per group, DF from table  will be 1.0 (Second column, first row)

Summary for design matters: 1. Determine coils per groups of the winding 2. Determine if the winding is lap or concentric
3.Determine is standard or concentric. 4. Go to the table and find the D.F

Regards

Carlos   

Carlos

RE: Winding terminology etc

(OP)
I am just now testing a new, someone else program for motor-redesign  and here you can see the values of the distribution factors for the aforementioned cases A, B and C, obtained from this program.
What is the formula for calculating the distribution factor for the consequent windings?
Zlatkodo




 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources