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...
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...
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?
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...
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...
We need to fix that. The stator of a very old micromotor for dental laboratories was defective.
Fortunately, only one of the 3 terminals lost contact. That has been fixed and the motor is now working well.
As can be seen, it is a three-phase motor powered via a VFD for speed control up to...
Only the first coil of each group is blackened.
What could be a reason?
Is it about corona discharge?
What is the remedy?
What to do during rewinding to avoid such an outcome?
The motor is TECO; 6,6 kV; 550 kW; six pole; DOL starting.
Thanks in advance.
I have a theoretical question.
If the three-phase motor winding is connected this way, what kind of connection is it?
1Wye or 1Delta;
2Wye or 2Delta;
3Wye or 3Delta or....?
This is about the IEC labeling and wiring of dual voltage motors with 9 and 12 leads.
Where to find valid IEC regulation?
There are various ways in practice.
See this WEG nameplate. Is it already outdated or there is something other?
9 leads, NEMA - IEC:
12 leads- IEC:
I stucked with particular version of two speed winding diagram 6/4 pole, 1D/2Y; 54 slots with odd grouping 1,2,5,4,3,2,1,1,5,3 (twice), pitch 1-7.
Is there any help?
I was reading somewhere about a specific issue relating to the application of single-phase motors in certain electricity distribution networks.
It is about the single-phase, capacitor-run motor which is designed for 230 V, 60 Hz. Connection to phase voltage ( L1 and N ie. phase and neutral)...
Lately, there is lot of motors with no any phase to phase end windings insulation at some new motors and consequently at motors coming out from rewind shops.
This is related to single-phase as well as to three-phase motors.
Suddenly, there is no need for end winding insulation? Why?
Whether...
In our rewind shop we want to test repaired motors (up to 60 HP) under load.
It seems that such dynamo-meters from various manufacturers are extremely expensive and we would try to do something ourselves using brakes or generator or motor etc...
Is there any idea how to do it?
Probably...
This is something weird that has never been done in our workshop.
Three phase, 72 slots, 6 pole, 60 HP, motor winding should be converted to 2 pole.
What would be an outcome (HP)? What issue could be expected?
Whether someone has already experienced such a conversion?
Thanks in advance.
I'm preparing to record an unusual three phase stator winding.
It's about a 24 pole, 96 slots but single-layer (48 coils).
Is such a connection already known to someone?
