Field Verification of an On-board Monitoring System for Ground-side Equipment Used in the SCMaglev's DWPT System

The Superconducting Maglev (SCMaglev) has adopted a dynamic wireless power transfer (DWPT) system for on-board power supply, with commercial operation set to begin. The DWPT system will be installed along the entire line, and it requires cost-effective maintenance solutions, particularly for the ground-side primary loop. To address this, a condition monitoring system has been developed to measure the induced voltage on the on-board coil and the gap length between the primary loop and on-board coil. This paper comprises four sections. The first section explains the configuration of SCMaglev's DWPT system. The second section presents an estimation method for the induced voltage using existing on-board components and simplified calculation, thereby eliminating the need for and additional sensing coil. The third section describes preliminary verifications of the proposed estimation method. The final section discusses the field verification results from a currently operational line. The filed verifications showed that the estimated voltage closely matched the measured voltage, with differences within several percentage. The measured gap length and on-site investigations indicated that the voltage is influenced by gap length, vehicle motion due to guideway alignment, and localized structural changes. A key achievement of this study is the large-scale verification of the monitoring system on an operational line.