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[kolbacict]

A permalloy laminated ring is put on top of the stator with a three-phase current in it.
Four turns of wire are wound on this ring.
My considerations were that in this winding EMF should be induced only from a rotating magnetic field. There should be no other transiductions from the stator to the ring.
I'm a little disappointed. The amplitude between the phases on the stator is 2 volts.
The amplitude on my winding on the ring is 20 millivolts. Without load.

[bistander]

A permalloy laminated ring is put on top of the stator with a three-phase current in it.
Four turns of wire are wound on this ring.
My considerations were that in this winding EMF should be induced only from a rotating magnetic field. There should be no other transiductions from the stator to the ring.
I'm a little disappointed. The amplitude between the phases on the stator is 2 volts.
The amplitude on my winding on the ring is 20 millivolts. Without load.

Is the voltage ratio ~= turns ratio? Like in transformer.
bi

[Dog-One]

Is your outrunner core wound like this one?

What RPM is the field spinning at?

Actually a little surprised you got much voltage to measure at all.
More turns of enamel wire certainly would boost the voltage some.
If you can get at least a couple of volts out of it, checking the
amperage would be useful information.

[rakarskiy]

A permalloy laminated ring is put on top of the stator with a three-phase current in it.
Four turns of wire are wound on this ring.
My considerations were that in this winding EMF should be induced only from a rotating magnetic field. There should be no other transiductions from the stator to the ring.
I'm a little disappointed. The amplitude between the phases on the stator is 2 volts.
The amplitude on my winding on the ring is 20 millivolts. Without load.

To understand the rotation of a field that rotates in a static core, there must be a constant magnetic field. From the distribution of the magnetic field strength in the body of the core relative to the conductor, an EMF will be induced.
It's just that you can't take different components from different devices and make a bullet.

[kolbacict]

Is your outrunner core wound like this one?

What RPM is the field spinning at?

Yes,  the stator is wound exactly that.
frequency 400 Hz. More my frequency converter  does not issue.
Of course, there are few turns on the secondary. I agree. But I couldn't placed it here anymore. I'll redo it.
Most importantly, I seem to have found that only a virtual rotating field can be induced in the ring around the stator. And nothing but that. All other ring will be ignored.
Am I right ?