1996 Volume 116 Issue 9 Pages 970-977
Recently, the leakage flux in the railway vehicles have been increasing. Therefore, on every kind of driven controlled vehicle (rheostatic control vehicle, field chopper vehicle, VVVF inverter control vehicle), the leakage flux was measured under the same conditions on the same railway line. And it was found that DC leakage flux above the reactor in the VVVF inverter control vehicle was biggest.
Then, the light shield materials and it's suitable configuration were proposed for the sake of keeping down below 1mT of DC magnetic field that is the commendable value of ministry of transport. Besides, the shield structure (materials and configuration) we proposed was taken in the practical vehicle and was tested in the actual line.
Through the actual tests and the computer simulations, the effectiveness of this shield structure was confirmed. And it was found that the total weight was about half of the iron shield assured the equal effectiveness.
Moreover, we proposed the estimation index that the operation waveform of pace-maker was normal or not for the effectiveness of shield, and tried to show the example of it's operation waveform.