Improvement of Inductive Power Collection in Null-flux EDS Maglev.

Abstract

In the superconducting maglev system it is important to develop a non-contact on-board power source without environmental pollution such as a noise and an exhaust gas, therefore, an inductive power collection (IPC) which utilizes a harmonic magnetic field generated by ground coils in EDS is being studied. However, alteration to a null-flux EDS which has a high drag ratio reduces the power collecting capacity in the IPC system. In addition, power collecting coils locate on a cryostat of superconducting coil (SC), so eddy current at the cryostat also reduces the power collecting capacity. Therefore, an exclusive SC type which locates the exclusive SCs for IPC and power collecting coils such as to face the upper and lower coils of ground coils, respectively, is examined, but we aim to improve the conventional type. After analyzing the influence of eddy current at cryostat in detail and improving the composition of power collecting coil and cryostat, we found that the conventional type has the same capacity as the exclusive SC type. In order to prove the above-mentioned result, we measured induced voltage of new type coils in a test run at Miyazaki test track and confirmed the output of this IPC system in a synthetic bench test of full scale with PWM converter and magnetic field simulator.