Application of single and three phase induction motor Best app to chat with sluts

If neither of the above occurs (not factor of 2 or 0 voltage) and you are comparing different phase pairs, I think you would see either no-change or sqrt(3) change (depending on polarity).In this case with x2-x5 still connectd, measure x1-x6. Now you need to repeat considering a different pair.* Homer Wisdom - "Operator, Give me the number for 911" * How would it work to induce a voltage in the second wye by applying dc to the first one?I am used to seeing 9 lead wye connected dual voltage motors, so 6 circuits 1-4,2-5,3-6,7-(10),8-(11),9-(12) (10,11,12 permanently connected wye) So if you apply dc to lead 1 and lead 2 of one wye and measure with a volt meter on second wye to find the lead pair with most induced voltage with the correct polarity, that should be the parallel circuit 7-8 shouldn't it.Repeat for the other combinations 2-3 to find 8-9 and then 3-1 and 9-7.by the time you do the second set you should know if the first pair was 7-8 or 8-7.Sounds like this is one of those 12 lead part winding motors. =====================================Eng-tips forums: The best place on the web for engineering discussions. S the winding leads are marked with 1,2 ,3 for the first half-winding and 7,8,9 for the second half.

In this case with x2-x5 still connectd, measure x3-x6. Well, it's late and that's a lot of stuff that just came out of my tiny tired brain. Two points that I would invite you guys to double check.1 - Is my assumption that voltage in corresponding pairs will be in-phase or 180-out correct?

"My suggestion was to apply 3-phase ac voltage to the first winding and run the motor no-load.

That creates a syncronous rotating field which induces voltages in the other winding.

pete, Come to think of it, I agree matching rotation doesn't guarantee phase matching. If this is a wound rotor motor, then one can energise the rotor and measure the phase match by measuring the induced voltages between the two sets of winding as you say.

Most sure method would be to dismantle the motor and physically trace the leads.

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That is a simple case and inductive kick will identify the corresponding leads.

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