Winding question, position of conductors in the slot 1

[Clyde38]

I have a client that is going to have an outside stator generator wound with multiple strands of wire. The supplier that is offering the winding equipment says they will be "needle" winding this stator with one conductor at a time, doing several iterations until the number of strands is met. They have posed the following question:

"Does it make any difference to the motor efficiency if all the 31 wires in hand are not right next to each other in the slot? I know of at least one other high efficiency motor project were we wanted to split the number of wires in hand in half and double wind. (It was like 12 wires in hand and we wanted to double wind with 6 wires in hand). According to what we were told it made a difference that all 12 wires were not together in the slot. ½ of the wires were in the front of the slot and ½ of the wires were in the back. We are not motor designers so we have no idea of what this might impact, we can only pass on what we have heard in the past."

This is a low voltage (40 volts) at a fairly low speed (3600 r/min) generator. It is a 16 pole permanent magnet generator, so the frequency will be 480 Hz.

Any help on this subject is appreciated.

Clyde Hancock
Design & analysis of electric motors and generators

http://www.motorconsultants.com

 

[EdStainless]

We used to needle wind long motors (24'). We wound one strand at a time and made sure that they laid straight (no criss crossing). We always made sure that the windings were close-packed to the front of the slot when we were done. These were medium voltage (800-2400V) motors and in most cases it didn't matter as the slot was tight with windings and there was no free space.

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P.E. Metallurgy, Plymouth Tube

 

[Clyde38]

Thanks, this is helpful.

Clyde Hancock
Design & analysis of electric motors and generators

http://www.motorconsultants.com

 

[edison123]

In a multi-strand, single turn conductor (known as Roebel bars), the positioning of conductors in the slot matters. In multi-turn coils, it is not that very important.

Muthu

http://www.edison.co.in