To provide stable operation, without causing a signal system to have malfunctions in an electric rolling stock running on a plurality of lines which are different in frequency used in a signal system.
This controller consists of the signal system disposed in a plurality of traveling lines for the electric rolling stock, a voltage command computing means 1 computing a three-phase output voltage command to drive an inverter from the drive command of a master computer, a carrier frequency selecting means 3 selectively-commanding switching frequency, based on information about a currently-traveling line which is outputted from an electric rolling stock location detecting means 2 in response to the position thereof free from malfunction in a signal system of the line, and a PWM pulse generating means 4 for generating a PWM-modulated voltage pulse train (PWM pulse), in response to the three-phase output voltage command and a switching frequency command, thereby switching the switching frequency of the inverter to such that the frequency band of the signal system may stay out of noise generated by the inverter.
INARIDA SATOSHI
NAKADA KIYOSHI
TOYODA EIICHI
