Multiple-range speed control system for a compound motor.

摘要

A compound-motor speed control system for a battery- powered vehicle (86) has a series winding (14) and a shunt winding (16) of the motor (12) magnetically linked in energy transfer relation. A first current switch (18) is connected in series with the series winding (14) and the armature (15), and a second current switch (20) is connected in series with the shunt winding (16). A digitally-implemented speed control system (24) responds to the speed selection settings of an analog device (64) to operate the first switch intermittently while holding the second switch closed over a lower speed range, and to operate the second switch intermittently while holding the first switch closed over a higher speed range.