Construction and measurements of an electrical excited synchronous machine with inductive contactless energy transfer to the rotor

This paper deals with the control and the operation of an electrical excited synchronous machine with a rotating contactless energy transfer system to power the excitation coil on the rotor. The system is used to replace the slip rings of an electrical excited synchronous machine. A control strategy for the electrical machine the contactless energy transfer system and an excitation current estimator are presented. The test bench for the electrical machine and the required components are described. To verify the presented theory, measurements of the temperature of the rotor, the excitation current estimator and the operation of the electrical machine are done.