Compatible controller-motor system for battery-electric vehicle

The thyristor controller and the d.c. motor of a battery-electric vehicle are considered as a system. The advantage of combining a current-controlled chopper regulator, using digital techniques, with a laminated-field series motor is outlined, design criteria are suggested, and an experimental system is described. Performance measurements using specially developed wattmeters are presented, which show the division of losses in the system, and the exceptionally high overall efficiencies over the speed range.