METHOD FOR ELECTRIC DRIVE CONTROL Russian patent published in 1997 - IPC

FIELD: electric drives for machine manufacturing, automatic control devices, tracing systems, sound recording and reproduction. SUBSTANCE: method involves generation of control signal as two alternating voltage levels which are phase-shifted and feedback signal, conversion of control signal to control magnetic field, which effects working magnetic field of rotor, generation of first correction signal by means of conversion of feedback signal to periodic signal which oscillation frequency is equal to current level of driving shaft rotation frequency, generation of second correction signal by means of phase shift of first correction signal by constant angle, setting frequency of alternating electric voltage at pre-set frequency of rotor driving shaft. Level of first alternating electric voltage is decreased by level of first correction signal; level of second alternating electric voltage is decreased by level of second correction signal. EFFECT: uniform and stabilized rotation of electric drive for wide range of rotation frequency, increased stability, increased speed of operations, increased efficiency. 1 dwg