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[kolbacict]

In the stator slot, as well as in the transformer window, there is no magnetic flux at all, which the conductor can cross with its magnetic lines.

Hmm... An interesting observation.
Let's then generally throw out the iron cores from everywhere.
Once upon a time I tried to cover the entire winding with homemade glue from crushed ferrite and epoxy.
So that there are no air gaps at all between the ferrite core and the wire.
It seemed to be better.

[rakarskiy]

Hi rakarskiy,
I will not attempt such proof here, but suggest study Biot-Savart Law and Ampere's Circuit Law.

Your groove, or slot in domestic terminology, is just a distortion in the air gap.
bi

I also thought, the more the magnetic induction parameter is accepted by the value in the gap, only in the gap of the magnetic circuit, and not the groove.
Everything turned out to be more prosaic.
In any case, there is no magnetic flux in the slot from the excitation circuit.

I have already said enough to think about what is really wrong, what is drawn about it in textbooks.

[bistander]

I also thought, the more the magnetic induction parameter is accepted by the value in the gap, only in the gap of the magnetic circuit, and not the groove.
Everything turned out to be more prosaic.
In any case, there is no magnetic flux in the slot from the excitation circuit.

I have already said enough to think about what is really wrong, what is drawn about it in textbooks.

Hi rakarskiy,

https://www.khanacademy.org/science/hs-physics/x215e29cb31244fa1:types-of-interactions/x215e29cb31244fa1:electric-and-magnetic-fields/a/electric-and-magnetic-fields

I attached an image lifted from the above website. Not a proof, but consider this. The current in the conductor results in the magnetic field indicated by concentric circles and B vectors. The current is moving charges. The process is reversible. A moving or changing magnetic field around the conductor will cause force on the charges in the conductor. If the conductor has a complete conductive circuit, current results. The magnetic flux lines need not touch or cut the conductor. Similarly the flux lines need not touch or cut the conductor in the groove.
bi

[SolarLab]

I also thought, the more the magnetic induction parameter is accepted by the value in the gap, only in the gap of the magnetic circuit, and not the groove.
Everything turned out to be more prosaic.
In any case, there is no magnetic flux in the slot from the excitation circuit.

I have already said enough to think about what is really wrong, what is drawn about it in textbooks.

This might help - or not!

24a. has the N1 Coil in the upper right. 24a. stator Lap slots are the lower section.
25a. has the N1 Coil in the lower right. 25a. stator Lap slots are the upper section.
Only the one rotor coil's Magnetic Flux Density is shown for clairity.
These are interactive representations so they are hard to show in static 2D.

SL

[SolarLab]

 Same as above except the Coil Current Direction is Reversed (ccw - was cw).

With just observing the plots it appears this one doesn't penetrate the adjacent
Stator Slots... just a quick observation however, at this point. No analysis...

Maybe examine off-setting the Stator and Rotor Pole pieces???

The Stator/Rotor Gap is quite large at 0.10" (2.54mm). These are from the original WAG LinGen
so as to keep things consistant.