Commutator-less DC machine control-drive - using control-regulation unit to generate square-wave current blocks position amplitude and duration and set-point signals

摘要

The control-drive for commutatorless d.c. machine is based on impressing square-wave current on the phase windings of the d.c. machine. The position, amplitude and length (duration) of the blocks of square-wave current are generated in the control-and-regulation unit (S) as set-point signals, which are then used to form the signals (Z) for controlling (driving) the inverter (W) switch. The machine torque is adjusted by means of positional adjustment of the current blocks length. The converter is released at partial load and idling only for short time periods (e.g. current block length Ti), phase-synchronously relative to the rotor movement. USE/ADVANTAGE - For inverter driven commutator-less d.c. machines. Fast rise time for current blocks achieved.