A Rotary Cylindrical Electric-Field Coupled Power Transfer System With Constant Current Output

This paper proposes a rotary electric-field coupled power transfer system with a cylindrical coupler to address power delivery challenges in metal-intensive aerospace slip rings. The rotationally symmetric design ensures stable coupling capacitance against rotational and minor axial misalignments. To address safety concerns, a human-body equivalent circuit model is established to quantify contact voltages, providing a theoretical basis for insulation design. Additionally, an LCL-S resonant network is adopted to achieve load-independent constant current output and zero phase angle operation. Experimental results from a laboratory prototype validate the proposed system, demonstrating its capability for high-efficiency power transfer. Furthermore, output current fluctuations are effectively suppressed under wide load variations, confirming the system's dynamic robustness and practical viability for wireless rotary applications.