Speed-controlled drive cct. for async. machine - has two phase-windings spatially and electrically displaced by ninety degrees

摘要

The speed-controlled drive circuit, for an asynchronous machine, has the async. motor provided with two phase windings displaced spacially w.r.t. one another by 90 deg. and connected into a 2-phase bridge circuit. The two phase windings are supplied from a static converter's inverter with two voltages phased 90 deg. apart electrically. The motor's neutral is connected to two series-coupled intermediate capacitors (3, 4) parallel to the static converter. For a 3-phase motor, the phase windings are spaced 120 deg. apart. The advantage of the drive circuit lies in its cheapness and simplicity.