Wireless excitation system

An excitation system comprising:

• a rotary transformer including:
• a stator that includes a primary winding and a primary ferromagnetic-material core, wherein the primary winding includes first and second portions spaced apart to define a stator gap (PG),
• a shaft configured to rotate relative to the stator during operation of the rotary transformer,
• a rotor affixed to the shaft to rotate along with the shaft while being spaced apart from the stator by a predetermined gap (G) defined at least in part by the stator gap, the rotor including a secondary winding, wherein the primary winding and the secondary winding have axial overlap, and
• a rotor support affixed to the rotor and configured to encapsulate the rotor, the rotor support being disposed within the stator gap between the primary winding and the secondary winding;
• a primary compensation circuit electrically coupled with the primary winding of the stator, the primary compensation circuit configured to be in resonance with the primary winding;
• a secondary compensation circuit electrically coupled with the secondary winding of the rotor and mechanically coupled with the rotor to rotate along with the rotor, wherein the secondary compensation circuit is configured to be in resonance with the secondary winding;
• a motor-field winding;
• and
• a rectifier electrically coupled between the secondary compensation circuit and the motor-field winding, wherein the rectifier and the motor-field winding are mechanically coupled with the rotor to rotate along with the rotor.