Reversing Windings in Unmarked Electric Motor: U1-U2, V1-V2, W1-W2 Connections

Hello
Gentlemen, one thing bothers me.
I got a motor after a few dozen kilo winding, which now has no markings on the U1, V1, W1 and U2, V2, W2 cables.
Please correct me if I am wrong.
U1 is the beginning of the winding, and U2 is its end.
Similarly with V1-V2 and W1-W2.
If I connect the wires from the KM1 contactor to U2-V2-W2 with star supply, and if the wires from the KM3 contactor to U1-V1-W1, and with the triangle
I will connect the wires from the KM1 contactor to U2-V2-W2 and the wires from the KM3 contactor to U2-V2-W3 will it be any problem for the motor?
The change consists in swapping the winding beginnings with the ends.
We never really know if we are dealing with V1 or maybe V2 (if there are no markings)

Thank you in advance for your response.

Swapping winding starts and ends has no effect on motor operation. It's important to change absolutely all beginnings and endings.

I also once got such an engine. How the master turned out so wound up. If I were you, I would do this: he sketched the can on the engine and marked the ends. Then he took an ohmmeter and measured - he found individual windings and then each described U1 the beginning of the first, U-2 the end of the first. V-1 beginning of the second, V-2 end of the second, and W-1 beginning of the third and W-2 end of the second. Now if you take the star-delta switch, it turns out that the input of the three-phase cable is described R, S, T and the outputs for the motor U1 U2, V1 and V2 as well as W1 and W 2. How to connect it should play right away. There is only one "but" ... this engine has such power that it should have and probably has a "sofstart". Then connect as described on this module. Good luck! Best for Christmas!

daro31ie wrote:

which now has no markings on U1, V1, W1 and U2, V2, W2.

I think that the beginnings and ends are lead out with different colors of wires, or possibly grouped in two triple bundles. If this is not the case then either all starts or all winding ends must be determined.

The engine is connected in star and delta.
It seems to be working properly, but I still have some slight anxiety. This one has a 20A higher power consumption as a twin motor not rewound.

daro31ie wrote:

It seems to be working properly, but I still have some slight anxiety

If he has already worked - he works, then everything is fine. If it were wrongly connected, it would "buzz", warm up, etc.

daro31ie wrote:

This one has a 20A higher power consumption as a twin motor not rewound.

And what is the current consumed by this and the other motor?

Hello .
Is something wrong, does it heat up at all phases? What comparable star / delta currents in both motors. Check the resistance of the windings, does it work quietly.

stanislaw1954 wrote:

daro31ie wrote:

It seems to be working properly, but I still have some slight anxiety

If he has already worked - he works, then everything is fine. If it were wrongly connected, it would "buzz", warm up, etc.

daro31ie wrote:

This one has a 20A higher power consumption as a twin motor not rewound.

And what is the current consumed by this and the other motor?

As it accelerates on the star is an old 45A, and this rewound 65A.

Added after 3 [minutes]:

nikusert wrote:

Hello .
Is something wrong, does it heat up at all phases? What comparable star / delta currents in both motors. Check the resistance of the windings, does it work quietly.

When the star or triangle starts, the consumption is similar, but as it accelerates, the one scrolled has a higher consumption on the star and triangle by about 20-30A

Is there a nameplate on the old one?. Or both engines have the same number of revolutions. We know how much the old one took before rewinding, does not heat now ?.

daro31ie wrote:

but as it accelerates, the scrolled one has a higher consumption on the star and triangle by about 20-30A

Unless already burned, give currents of individual phases.

It will brighten the situation forever.

Such a makeshift solution is to pass through a second motor connected in series with its windings with this tested motor without load. This method reduces the risk of burning the motor in a doubtful winding sequence. Proven in practice.

If it is properly connected and such a difference is something "no hell". The only question is WHO he rewound it and with what wire. Because with all respect for professionals but "students" do not go to such serious work, and when he lets go he looks at his hands and pours on his paws. Turn off the engine and take measurements. Something must be wrong, e.g. resistance of individual coils, leakage relative to the housing, and other unforeseen matters. Measure it because you are running a motor and a half company. I hope not!

Everything ok. Problem solved.

daro31ie wrote:

Everything ok. Problem solved.

There is nothing like giving a professional solution, unless it is a state secret which was the cause

And what was the reason for writing posts and this current?