Direct rotor current measurement for transformer-fed wound rotor machine

A wound rotor synchronous machine (WRSM) comprising:

• a rotary transformer having a primary coil and a secondary coil;
• a rectifier connected to an output of the secondary coil via an alternating current (AC) conductor, the rectifier having a positive direct current (DC) output and a negative DC output;
• a rotor connected to the positive DC output and connected to the negative DC output, the rotor including a shaft;
• a winding wound around the shaft, wherein the winding comprises a turn of one of the positive DC output, the negative DC output, and the AC conductor;
• and
• a contactless sensor disposed adjacent the winding and in communication with a controller.