Abstract
A BROADENING application field for the President's Conference Car (PCC)-type electric car has introduced new and more severe requirements in the design of its propulsion equipment. This has resulted in a new raction motor embodying the latest progress in design and manufacture, and particularly suited to dynamic braking at the high operating speeds currently coming into vogue. The application of the PCG car to high-speed tuburban service, and the utilization of the same propuision equipment for lightweight rapid transit service, have set the stage for a redesign of this equipment to meet the new performance demands. Whereas a speed of 35 miles per hour was rarely exceeded in city service, speeds of 0 miles per hour and above may be expected in rapid transit and suburban operation. Coincident with the increase in top speed is the requirement that dynamic braking be made available from these speeds without injury to the motor from overvoltage.
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