If we could transfer energy wirelessly with 100% at short range. Then what if we create a motor that have both stator and rotor be an electromagnet? By putting a magnetic coupling to transmit energy from stator and rotor would have a coupling receiver that output energy to magnetic winding
The design would be exactly the same as a DC motor. Maybe a design like a brush DC motor that replaces the brush with a wireless energy receiver and electronics controller. Or a brushless DC motor with only a wireless energy receiver.
Unlike induction motor or conventional DC motor, both stator and rotor are electromagnet pushing and pulling each other directly So we wouldn't need a permanent magnet at all but I think it would provide more torque and efficiency than an induction motor, and more comparable with a DC motor
But I can't find anyone who designs a motor this way. Is there any problem or disadvantage of this concept?