SENSORLESS SECURITY SYSTEM FOR DETERMINATION OF ROTATION OF LAUNDRY DRUM OF HOUSEHOLD ELECTRIC APPLIANCE DRIVEN BY THREE-PHASE ASYNCHRONOUS ELECTRIC MOTOR Russian patent published in 2014 - IPC D06F58/28 

FIELD: personal use articles.

SUBSTANCE: invention relates to an electric appliance (1) containing a body (2), a laundry drum (3) mounted inside the body (2) so that to be capable of rotation round a rotation axis, a three-phase asynchronous electric drive (6) rotating the laundry drum (3) and a sensorless security system (7) intended to determine where the rotor (32) rotation is in place (32) with a view of determining whether rotation of the laundry drum (3) is in place. The sensorless security system (7) is designed so that to enable supply of three DC values (Ias, Ibs, Ics) to the stator three power windings (31) during a preset time interval (ΔT) for the rotor magnetisation (32), direct currents (Ias, Ibs, Ics) supply tripping, determination of the temporal character of at least one of the three currents (Iar, Ibr, Icr) induced in the stator windings (30) as a result of the rotor magnetisation (32) and determination whether rotation of the rotor (32) is in place based on the temporal character of at least one of the three induced currents (Iar, Ibr, Icr).

EFFECT: design improvement.

16 cl, 7 dwg