Pulse duration of the electric motor the case of control of the drive which is modulated you say that the pulse duration modulation signal which manner and control circuit null it drives

摘要

This invention the electric motor (1) pulse width the case of control of the drive which is modulated the pulse duration modulation signal which it drives controls here in regard to the method in order to decrease the noise which is riding in the railroad track, (S) one or has had the plural signal side edges with 1st signal level and 2nd signal level in one timing cycle, the pulse duration modulation signal (S), it has possessed with the 1st part where at least one of the signal side edge has 1st side edge slope and the 2nd part which possesses 2nd side edge slopeThe way it is formed, 1st absolute value of side edge slope 2nd is smaller than absolute value of side edge slope.