internal connections for 3 phase motors.

[threephase]

ran into a problem last week trying to reconnect a 2 delta, 575v 3 phase motor to 4 wye 480v. does anyone know where i might obtain some internal winding connection diagrams for 3 phase "concentric" wound motors. have all the lap winding connections, but am lost when it come to concentric windings.

 

[SteveKW]

How many leads come out of the motor?

 

[threephase]

six leads out, u1,v1,w1,x1,y1,z1. two wires on a lead, 12 groups 24 ends, all starts are lines, all finishes are jumpers.

 

[SteveKW]

Do you know how to do the "spiral" diagram to label the leads 1 through 12?
Take one of the delta's and label them 1 to 12. Do the same with the other.
Your leads should be 1,2,3,10.11 & 12.
Jumpers are 4 & 7, 5 & 8 and 6 &9.

 

[busbar]

...12 groups 24 ends...? Aaaagghh! Please pardon my outburst. My head just exploded.

 

[SteveKW]

Talk about your head exploding... we just did a two speed two winding motor. 2/18 pole! The 2 pole comes out to 12 leads and the 18 pole works out to 108 leads!

 

[jbartos]

Suggestion: It will be more accurate to perform the markup in terms of u1,v1,w1,x1,y1,z1 by adding appropriate suffixes.