Influence of Linear Motor Car (On-Bord Primary) to Environment

Abstract

Among linear motor-driven railways, on-board primary linear induction motor-driven railways (steel wheel supported system and levitated system by conducting magnets) have been putting to practical use. This paper refers to electric field strength and magnetic field strength radiated about by these systems. The results are as follows: (1) Directly reached radio noise radiated by the linear motor car has the 1~2 MHz frequency region at most. (2) Radio noise by the linear motor car is similar to that by the VVVF inverter controlled car. (3) Magnetic field strength inside the linear motor car is the largest upon the reactor, but is not larger than the ordinary car. (4) In the inspection pit, just under the linear motor magnetic field strength is larger, but decreases to safety level at some distances due to the large attennuation. With the above-mentioned founding, the conclusion are as follows. (i) Peak envelope detection is the refining method in care of the measurement of electric field strength radiated by electric railways. (ii) It is necessary to establish the united standards on the magnetic field strength inside the electric railway cars. (iii) The characteristics of electromagnetic field are of little difference between the linear motor cars and the ordinary motor cars. © 1990, The Institute of Electrical Engineers of Japan. All rights reserved.