
292 Shipboard Electrical Power Systems
the route and time of the day. It can travel up to 55 mi/h (mph) on the standard-gage
tracks. All cars in a train are controlled from a central control station. Acceleration
is controlled at 2.5 mph/sec rate up to full speed of 55 mph. Deceleration is at 2.5
mph/sec rate by regenerative braking from 55 mph down to 10 mph, and then by
pneumatic air-brakes to full stop.
The dc motors are 4-pole compound wound with commutating poles, using both
series and shunt eld coils, which are changed as required during the acceleration
and deceleration periods. Each motor is rated 100 hp, 300 V, 280 A, 1175 rpm. Each ...