Electric traction vehicle control circuit - uses pulse control system for thyristor bridge circuit between asynchronous machine and current collector

摘要

The control system for the drive of a railway vehicle includes a control circuit connected between e.g. an asynchronous machine (6) and a current collector (7) in contact with a rail (8) connected to a d.c. supply. Between them is also a 6 pulsed thyristor bridge circuit (1) connected by a choke (2) to a d.c. adjuster (4). In parallel with them is a pulse divider (13) and a frequency converter (14) connected to a frequency control system (20) applying control pulses to the bridge circuit. The frequency controller is also connected by a frequency converter (11) with an oscillator giving frequency control pulses to the d.c. adjuster. The ignition frequency is controlled by the thyristor bridge circuit frequency so that the difference frequency between those frequencies is maintained at a predetermined frequency from the critical frequency of the bridge circuit.