ALTERNATING CURRENT ELECTRIC DRIVE Russian patent published in 2014 - IPC H02P27/06 H02P27/08 

FIELD: electricity.

SUBSTANCE: alternating current electric drive contains asynchronous motor, inverter with pulse-width modulated regulator, two stator current sensors, frequency-setting unit for stator field rotation and amplitude voltage, voltage correction setting unit, which contains calculating unit that produces voltage-setting correction signal in function of the calculated parameter - tangent of angle between vectors of current and electromagnetic force of stator calculated on the basis of measured stator phase currents and signals setting phase voltage for the motor. Electric drive operates with actual measured variables thus simplifying algorithm for correction signal calculation and bating demands to the process controller.

EFFECT: reducing current of stator that ensures the preset motor torque, improving working efficiency of the device.

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