DEVICE FOR CONTROL OVER DIGITAL FREQUENCY-ADJUSTABLE ELECTRICAL DRIVE Russian patent published in 2015 - IPC H02P1/30 H02P27/06 H02P3/18 

FIELD: electrical engineering.

SUBSTANCE: proposed device comprises controlled frequency inverter, intensity master, motor e.m.f. and voltage error sensors, motor e.m.f. controller and frequency controller. Additionally introduced are current transducer, function generator, motor e.m.f. feedback signal time sampling unit. Thinker defines the sign of motor e.m.f. signal current increment. Correction unit corrects motor acceleration and deceleration time subject to aforesaid sign. Motor acceleration and deceleration is controlled by time sampling of motor e.m.f. feedback signal time sampling, measurement of instantaneous amplitudes of quantised pulses and determination of sign of motor quantised e.m.f. signal current increments. Second differences of instantaneous amplitudes for every three quantised serial pulses are calculated. Acceleration and deceleration times are corrected subject to the sign of said second differences.

EFFECT: optimised acceleration of drive without overload at inverter power components.

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