Transit vehicle start-up propulsion motor control apparatus and method

摘要

Current regulation is provided for the propulsion motor of a vehicle operative with a track signal block control signal having a known frequency characteristic, by modulation of a selected group of potential output ON pulses from a chopper apparatus coupled with the motor and in relation to the program cycle time of a control microprocessor such that the resulting harmonic sidebands are positioned to minimize electromagnetic interference with that control signal.