Self Control System of Superconducting Maglev Synchronized with the Phase of Electromotive Force

Abstract

In the Yamanashi Maglev Test Line, the location of the train is detected with the inductive radio system within the deviation of 3 degrees. The inductive radio system is very reliable and accurate. However using the inductive radio system, we have to lay the cross inductive cable along the guideway and set up the detecting system of train's location in each power conversion station. Therefore the construction costs of the system is expensive. On the other hand, from the safety point of view, we have to examine the other method of detecting train's location, in case of inductive radio system down.
In this paper, we propose a new train's location detecting system using the phase of Electromotive Force (EMF). In this system, the inductive radio system is not required. In the LSM drive control system, the phase locked loop (PLL) uses the phase of EMF that is estimated by EMF observer. The reduced-order state observer estimates the phase of EMF according to output voltages and currents of Inverter. We report the configuration and the basic characteristics of the EMF observer in the Yamanashi Maglev Test Line.