An LCC-P Compensation Topology Applied to a Wireless Excitation System Without a Receiver Filtering Capacitor

Wireless excitation systems can solve mechanical wear problems and address the unreliability of carbon brushes and slip rings in electrically excited synchronous motors (EESMs). As the wireless excitation system rotates at high speed with the motor, minimizing components at the receiver side is crucial for reliable operation. Maintaining a constant excitation current under stable motor conditions is crucial, but load resistance fluctuations complicate this task. Thus, the system requires constant current output for reliability. This paper proposes a new LCC-P compensation topology applied to the wireless excitation system, which eliminates the receiver filtering capacitor and thereby reduces the number of components at the receiver side. The advantages of eliminating the filter capacitor is analyzed in this paper. Then, the working theory of the proposed topology and the conditions for achieving constant output current and achieving ZPA and ZVS are analyzed. Finally, a simulation model is established to verify the performance of the LCC-P topology, and the results demonstrate the advantages of the new LCC-P topology.