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Several examples from a publication on how to convert a three-phase concentric winding to a double-layer lap winding are found online. The displayed table shows the value of the conversion factor in the case of a 54-slot, 2-pole, mixed winding ( 30 coils in total) with pitches of 1-20, 22, 24...

Hi, prc, Thank you for the quick response. I have to admit that from the given formula, I don't see a clear relationship between power and the cross-sectional area of the core. Also, I wonder if the formula for transformer power should include the cross-sectional area of the core window. Could...

Thank you all for the very helpful advice. There is one more thing I should ask since I have found quite different recommendations in the books. It concerns the relationship between the cross-sectional area of the core and the power of the transformer. Is there any reliable formula...

I would need advice from esteemed experts on this forum. It concerns the custom design of a dry, low-voltage power transformer with an approximate power rating of 1 to 3 kVA. The issue at hand is that we have several sizes of new "EI" transformer cores of unknown quality and manufacturer, in...

The pitch is 1-6. (Btw, I came across this diagram looking for an option to redesign the motor (96 slots, 8 poles) to the highest possible number of poles.) Apparently, it's consequent pole winding with extended pitch and I really don't know why pitch 1-6 was chosen. As for the standard winding...

4 circuits. It should work but at first glance seems to me that half of the coils are wasted because of the extended pitch. Pay attention to all the slots where the coils are marked with the same color. Current flows in opposite directions, and there is no torque contribution from these coils...

Does anyone else see something very strange in this unusual diagram? It is a three-phase, double-layer 32-pole motor winding with 96 slots. Is this connection correct? If so, are there any benefits?

Hi, Electricpete, I'm quite surprised if you're not recognizing that this is the same question, not a new one. I have some experience as a winder, but I'm not particularly fond of theory. Additionally, I didn't see any specific answers to my last, very straightforward questions. So, could you...

I will try to add a couple of questions (instead of answers) that simulate this situation and maybe make this puzzle easier to solve. Let's consider an original submersible pump motor with a power rating of 60 HP, where we will replace only the winding according to the original winding data of...

The old pump has already been repaired and returned to the customer. The spare pump will eventually be used in another place, with a lower HP requirement. That's what the customer decided. By the way, in brief, I had asked the same question elsewhere and was told: Increasing the length of the...

In fact, this is not a purely hypothetical scenario. One of our customers brought a submersible water pump to our service for repair, which worked successfully for a long period of time. At the same time, the customer had the intention of replacing it with a new spare pump from their warehouse...

Unfortunately, I did not receive the expected response. If you read carefully what I wrote, the question is clear and there is nothing nebulous about it. Please read my post again. What is not clear? The new motor would work on the same machine and the same load.

Hypothetical, theoretical question about electric motors. Let's say we have a fully functional three-phase squirrel-cage LV motor. Let's imagine we made another one with exactly the same geometry of stator and rotor lamination, exactly the same winding (turns/coil, wire size, pitch, etc...). The...

Perhaps something like that: https://www.youtube.com/watch?v=oDI1YxDDEB8

You do not have to worry as long as the current is below the rated value. Very often the currents differ due to various winding imperfections. Different resistances of phase windings are the most common imperfection of windings, not because of different number of turns per phase, but rather...

Try another tachometer.

It sounds strange, but several times this type of crane motor arrived in our workshop (mostly just the stator). The stator is a two-speed motor 8 and 4 poles, constant HP connection but the rotor has an 8-pole winding. Costumer claims that the motor runs at low speed with rotor resistances...

At full load kVA = 20*0,746/(0.9*0.85)=19,5 kVA

Nr. 6 is also ball bearing. They could be the ceramic type.

Thanks, RedSnake, It's a lot like my case. It may even be the same manufacturer. The rotor appears to be a squirrel-cage type. Is this motor rewindable at all? It would be nice to hear from someone who has already had the opportunity to disassemble motors like this.