Substitution of relay-contactor control with chopper control for locomotives in mining industry

The authors deal with the solution of a thyristor chopper for the speed control of a DC series motor for mine locomotive drives. They describe the basic functions and a way of driving of the chopper. The differences between chopper control and relay contactor control are underlined. The chopper's basis functions and its driving equipment are illustrated with the results of tests carried out on the constructed device.<
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