The Separately Excited DC Traction Motor Applied to DC and Single-Phase AC Rapid Transit Systems and Electrified Railroads, Part II---Application

The characteristics and the construction of the separately excited dc traction motor has been described in [1]. This type of motor can be used for traction only because of the availability of large power thyristors. In this paper, the type of control circuit required in order to use the separately excited dc motor (dc-dc chopper or ac-dc converters) will be investigated depending on the power supply available (ac or dc).