METHOD AND DEVICE FOR QUASI-FREQUENCY STEPLESS START OF SYNCHRONOUS MOTOR Russian patent published in 2006 - IPC H02P1/52 

FIELD: all fields of national economy using heavy-power synchronous machines.

SUBSTANCE: proposed method and device that can be used, for instance, in gas industry for starting electric drives of gas-transfer units involve connection of excitation unit to field winding, determination of pre-start rotor position relative to stator windings, measurement of voltage across stator windings, current through stator windings, supply voltage and field winding current, evaluation of motor speed by electromotive force induced in stator windings and estimated by voltage across stator windings and current through stator windings, current pulse supply to stator windings with aid of thyristor voltage regulator by sending control signals to control outputs of mentioned voltage-regulator thyristors, regulation of parameter of current pulses supplied to stator windings and field current so that mean torque of machine were higher than motor moment of resistance.

EFFECT: reduced in-start thermal and mechanical loads and start-to-start intervals, enhanced number of starts and service life of motor.

2 cl, 3 dwg