Figure 3 from Design and evaluation of a 1.2 kVA single phase rotary transformer | Semantic Scholar
Design of a Rotary Transformer for Installations on Large Shafts
Construction and test of a rotary transformer for direct current . rom 117 volts at 0 to 43,6volts at 38.5 amperes, the motor voltage varying hutslightly with an increase of onrrent.
Rotary Transformer (for Persistance of Vision displays) - YouTube