Application of Gate Turn-Off Thyristors in 460-V 7.5-250-hp AC Motor Drives

1 July 1983

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industry Applications

Vol. IA-19 (4) , 554-560
https://doi.org/10.1109/TIA.1983.4504255

Abstract

A 7.5-250-hp range of variable-frequency ac motor drives has been under development at the Westinghouse R & D Center since early in 1981. Design and performance details for prototype equipment rated for 10, 20, and 50 hp will be discussed. The drive system comprises a three-phase thyristor controlled ac/dc converter in conjunction with a dc/ac adjustable-frequency inverter using gate turn-off thyristors (GTO's). The output of the inverter is a six-step voltage wave in the range of 6-120 Hz, suitable for driving three-phase ac induction or synchronous motors. Details of the inverter design, including means to protect the gate turn-off thyristors from output line-to-line or line-to-ground short circuits, will be given special attention.

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