Analysis and Design of Rotary Wireless Power Transfer System With Dual-Coupled XLCS Compensation Topology

This paper presents a dynamic wireless power transfer (DWPT) system for rotary equipment. Two concentric coils on the primary side are used to keep the mutual inductance between the primary and secondary constant during the rotation. The dual-coupled XLC/S compensation topology is proposed to enhance the radial misalignment tolerance performance and improve the flexibility in the design of loosely coupled transformers (LCT). The design flow of LCT and optimization process of component parameters are proposed to achieve radial misalignment tolerance. The characteristics of constant current output (CCO) and zero voltage switch (ZVS) are realized. The power flow is analyzed. A 200-W prototype is designed and implemented to validate the proposed design method. The experimental results show that the proposed LCT structure with dual-coupled XLC/S compensation topology can achieve high tangential and radial misalignment tolerance. Therefore, the system proposed in this article is suitable for powering the device that rotates around an axis wirelessly.