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THYRISTOR LOCOMOTIVES WITH THREE-PHASE DRIVES - DEVELOPMENT FOR THE FUTURE

Per Leander

Abstract

Up to now, ASEA's thyristor locomotives have been equipped with d. c. motors. Now that static high-power inverters are available, the alternative with three-phase induction motor drives has opened up interesting possibilities. The development of a locomotive with three-phase drive, also known as the three-phase asynchronous locomotive, inverter locomotive, etc. , represents ASEA's hitherto largest development project in the traction field. The propulsion system for one motor in the Rz locomotive with three-phase drive is described. This system is based on the use of voltage-source inverter (VSI). A single-phase line inverter (NVX) feeds a voltage d. c. link (U//d). From this the motor inverter (MVX) generates a three-phase variable-frequency alternating voltage. Power pulsations of twice the line frequency of the traction supply system are smoothed with a tuned filter (G) in the link. The inverter, motor design and speed control features are briefly described.

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Key concepts: Inverter, Induction motor, Thyristor, Engineering, Traction motor, Thyristor drive, Electrical engineering, Three-phase