| 摘要 |
FIELD: special or general-purpose electric drives for industry. SUBSTANCE: setting signal across control system input is varied at desired rate, polarity of speed control error and current in motor armature circuit are checked, and in case of variation in speed control error polarity and its excess above desired threshold value, current setting signal is disabled; when motor current drops to zero, pulse-phase control system is disconnected from gate electrodes of working group of converter valves and upon expiration of preset no-current interval pulse-phase control system is connected to other group of converter valves; setting current signal is enabled again, change-over of converter valve group is interlocked in control action intervals. EFFECT: reduced nonproductive power consumption during changed-over of converter valve groups within control action intervals at no load; improved efficiency of drive. 1 dwg øøø1 |
