OSCILLATION DRIVE OF THREE-PHASE ASYNCHRONOUS DRIVE

Invention refers to electrical engineering and it can be used in electric drive systems. Its aim is to increase efficiency coefficient of oscillation drive. Stator phase windings of asynchronous engine are added to one-phase power supply 23 with semiconductor manageable switches, accordingly 1 and 2, 3 and 4, 5 and 6. First circuit, which is connected to A-phase stator winding 13, contains semocinductor manageable switch 7 and capacitor 16, bet second circuit - manageable switch 9 and capacitor 17. First circuit is connected to B-phase stator winding 14, it contains semiconductor manageable switch 10 and capacitor 16, bet second circuit contains semiconductor switch 9 and capacitor 17. First circuit is connected to C-phase stator winding 15, and it contains semiconductor manageable switch 12 and capacitor 16, but second circuit contains semiconductor switch 11 and capacitor 17. Step-up DC-to-DC voltage converters 18 and 19 are connected accordingly to capacitors 16 and 17. These capacitor's outputs are connected to accumulative capacitor 22 through the dividing diodes 20 and 21. The connection order of power source 23 voltage half-periods to A, B, C-phase winding ensures that the exciting moment of engine don't change operational direction, i.e., the rotating direction of magnetic flow in stator windings is provided constant. In every supply voltage half-period the energy stored from the windings 13,14 and 15 of stator phases A, B, C is transferred to capacitor 16 or 17. These capacitors through the step-up DC-to-DC voltage converters and dividing diodes 20 and 21 transmit the power to accumulative capacitor 22.