Effect of Al Alloy Permanent Magnetic Guideway Enclosure on the Dynamic Performance of HTS Pinning Maglev System

In the high-temperature superconducting (HTS) pinning Maglev system, self-stable levitation without energy consumption is achieved by the interaction between high-temperature superconductor bulks and the permanent magnetic guideway (PMG). The PMG is mainly composed of NdFeB permanent magnets, which can be easily corroded in harsh environments. A protective metal enclosure for PMG is introduced into the HTS pinning Maglev system to provide the PMG with a protection method of better corrosion resistance. The introduction of aluminum alloy protection plates in the system will inevitably increase the complexity of the electromagnetic relationship of the system, bringing additional electromagnetic force excitation and affecting the operation quality as well as the safety of the HTS pinning Maglev vehicle. The dynamic response of the system is studied through experiments and simulations. First, the dynamic levitation, guidance, and drag forces of the system during the operation are measured using a self-developed HTS Maglev dynamic measurement system (SCML-03) and compared with the original HTS pinning Maglev system without aluminum plates. Then, a finite-element analysis using an equivalent method is conducted based on the measured flux changes to study the system's electromagnetic forces' characteristics under high-speed operation. Finally, the electromagnetic force excitation is put into a dynamic model of an HTS pinning Maglev vehicle, and the responses are analyzed.