Characteristic Analysis Of Relatively High Speed, Loosely Coupled Rotating Excitation Transformers In Hev And Ev Drive Motor Excitation Systems

An inductively coupled power-transfer method is proposed using a new, brushless motor excitation method called contactless excitation system (CES). Uses a loosely coupled rotating excitation transformer (LCRET) and realize the transmission of excitation power, thereby proving to be safer and simpler than traditional excitation systems. The principles and two topologies are introduced. LCRET can achieve excitation-energy transmission when the primary and secondary sides rotate at a relatively high speed. The transient characteristics of the proposed topologies are compared using a finite element analysis to establish an optimal topology and verify the safety and high-efficiency energy transmission of LCRET by conducting tests.