Abstract
The thyristor chopper combined with a constant voltage power supply, such as battery, is widely used as a high efficiency variable D-C power source for D-C motor control. The stepup chopper for regenerative braking is used together with a step-down chopper for drive, in order to obtain faster deceleration of the motor and higher efficiency of the system.
This paper deals with the characteristics of the separately excited D-C motor regeneratively braked by a step-up chopper and a D-C power sink. The characteristics of the motor being braked are calculated, in the same manner as with it being driven. In the calculation of a braked motor, the armature voltage in the motor's driven state is replaced by the difference between the sink voltage and the armature voltage. Also the speed voltage is replaced by the sink voltage minus the speed voltage. The similarities between the characteristics of the motor being driven and those being regeneratively braked are confirmed by the equivalent circuits, by the voltage and current waveforms and by the load characteristics with experimental results.
