IMPULSUEBERWACHUNGSVORRICHTUNGEN

摘要

A controller for a series electric motor is described of the type comprising means for applying D.C. pulses to the motor and means for controlling the mark/space ratio of the pulses applied to the motor. The current through the motor is sensed and the maximum mark/space ratio which may be applied to the motor is reduced when the motor current is below a predetermined limit to avoid overspeed in light load conditions.