A feeding circuit for a superconducting magnetic levitation train system (MAGLEV) consists of feeder cables and armature coils which show characteristics of a distributed-parameter line. Electric power is supplied to the cables and coils by inverters whose output voltage contains a large amount of harmonics. As a result, a harmonic resonance may occur in the feeding circuit. Besides the above characteristics, the connecting point of a section (group of armature coils) changes according to the movement of a MAGLEV train, thus causing changes in the harmonic-resonance characteristics of the feeding circuit. This paper describes analytical results of the harmonic resonance in the feeding circuit for MAGLEV, with the focus on changes in the connecting point of a section.

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