THERMAL-BEHAVIOR OF A DIRECT-CURRENT TRACTION MOTOR DRIVING A RAILWAYTRAIN

The mean temperatures of a thyristor-driven traction motel, while oper ating on a very busy railway-line, have been measured. The factors aff ecting the attained temperatures are the loaning imposed on the motor, its electric-current input, the train's speed versus time pattern, th e dwell times at the stations on route, and the driving practice. It i s essential to timetable the operations of the train so as not to over load the traction motor, and thereby avoid its overheating and rapid s ubsequent breakdown. Design improvements are suggested.