Just little thought.
There is one thing we would like to highlight.
We were very limited in equipment for taking measurements. Let’s see what we used:
The following board was used to measure current voltage. The field created by the transmitted current was measured inside one of the blue coils and used later to inspect the phase in which the current is located.
The transformer was used to decouple the inverter and motor circuits, this was a necessity, since the oscilloscope did not decouple the measured circuits, and there was a danger of creating a short circuit.
The following image shows the Siemens S120 inverter, which has the ability to generate to the grid.
Synchronous and asynchronous motors, information about which was written earlier
Specifications of synchronous motor