ALTERNATING CURRENT DRIVE Russian patent published in 2016 - IPC H02P21/00 H02P21/12 H02P27/08 

FIELD: electronic equipment.

SUBSTANCE: invention can be used in AC controlled electric drive. AC electric drive comprises asynchronous motor and inverter with PWM-controller, two stator current sensor, unit for setting stator field rotation frequency and amplitude of voltage, voltage setting correction unit, comprising a unit for calculation operations which generation of correcting signal setting voltage in function of calculated parameter - tangent of angle between vectors of current and stator EMF, calculated based on measured values of phase stator currents and signals setting phase voltage engine, includes a unit, signal variation correction with allowance for saturation of engine. Invertor generates stator phase voltages with frequency and amplitude required to provide specified torque under condition of minimisation of stator current consumption from network with due allowance for saturation of engine. Electric drive operates with actual measured variables thus simplifying algorithm for correction signal calculation and bating demands to process controller.

EFFECT: technical result consists in reduction of stator current in starting conditions providing specified motor torque, improvement of serviceability of device.

1 cl, 3 dwg