Identifying Motor Windings

First try turning the motor terminal cover upside down or looking at the name plate(s) on the motor, as the terminal and star/delta designations are generally marked here.

If the label is missing (or you need more information) consult the motor manufacturer's manual (available off the manufacturer's website) as motor winding configuration varies (to some extent) between motor types and manufacturers.

If all else fails you could actually measure the winding resistance, but this test may not help as it depends on the motor type, single phase/three phase motor, motor capacitors (all motors of which have six wires).

There may be two speed windings in the motor. So you may have six leads.

If it is a single speed motor then you have to identify 6 leads. Use IR tester to identify 3 windings and their 6 leads. Then connect any two leads of two winding and apply small voltage across it and measure the current. Then again connect alternate windings of same two windings and apply small amount of voltage(same as before) and measure current. Check in which mode you get the max current and then mark it as a1-a2 & b1-b2. You get max current when a2-b1 will be connected and voltage applied between a1-b2. Follow the same process to identify a1-a2, b1-b2, c1-c2.

now you will be able to connect it in delta or star.

HELLO! I AM RAJIB, MANY MANY THANKS FOR YOU ANSWER.

I AM FINDING THIS ANSWER FOR LONG TIME.

I YET NOT TEST WHAT YOU SUGGEST BUT I THING YOU ARE 100% RIGHT.

would these 6 ends be the connections of the three phases? If so are you trying to "phase" the windings, that is find the correct ends to either connect the motor in "Star" or Delta"?

If you can rotate the shaft:

1. Identify the 3 windings.

2. Connect to phase sequence detector.

3. Connect as required, star/delta.

Hope it helps

Wangito.

It will be easy to identify if all the six terminals are labeled with the conventional motor terminal marking; U1, V1, WI for starting leads and U2, V2, W2 for end leads. How ever if the starting leads are stared and powered from the end leads, the motor will still run in same direction and with 100% efficiency as in the former.

One thing we should know and understand is that if the 6 leads are not labeled and there is a misplacement in the leads, there is no other way to identify them other than opening up the motor by an experience rewinder to identify the leads. They are equally displaced in the slots for starts and ends leads.

U can let us have the speed or number of poles to enable us help with the slot displacement where the start and end wires are located.

Dickson

? It perplexes me to see such valiant attempts to answer such an incomplete question....

Nobody asking the OP to FIRST provide more information, such as the voltage, single or three phase, cap-start or cap-run, etc. etc. etc...(?!?)

From the old For-What-Its-Worth department, my stab-at-it: see (my) Post #4 at this thread.

Brought a smile to my face you did.

I think a lot of people like the challenge of answering the half question more so than the detailed, to the point, probing question as it gives us the opportunity to flex the brain tissue, and dare I say it, show off a bit with our skills at trying to identify EXACTLY what it is the OP is trying to say and find out.

Yes, with some of the answers one does sit back and ponder the logic and sometime the complexity of the answer, especially when a very simple one would have done.

That being said, we all like a challenge (and the opportunity to show off a little), if we didn't then we would not even bother to try and help a fellow engineer or student trying to make their way in this very complexed world of engineering.

As for asking the OP for X, Y & Z as you stated, because no-one has yet, well now they have, you! Hopefully we'll get an answer... I don't recall and answer to my question as yet. Maybe its a language/comprehension thing, I note many OP's are from overseas and English is NOT their first language.... something to consider as I'm sure you have.

I like the challenge of the question, even if it is only half a question, we are more like a "Help Desk" trying to help without the benefit of looking at the problem, long may it continue.

Yep go on tick the "off topic" box... I don't mind

Ur wright in Ur comments but this question is complete and can be well imagined.

Dickson