METHOD FOR ENERGY-EFFICIENT DUAL-ZONE CONTROL OF ASYNCHRONOUS MOTOR SPEED IN MOMENT DIRECT CONTROL SYSTEM Russian patent published in 2016 - IPC H02P27/06 H02P23/00 H02P25/02 

FIELD: electronic equipment.

SUBSTANCE: invention relates to electrical engineering and can be used in industry and transport in systems of an electric drive with direct control of asynchronous motors' moment (ad). Method of asynchronous motor speed adjustment presupposes direct control of the momentum (Direct Torque Control, DTC), at that, determination of limit momentum calculated by a speed controller, is performed by dividing the specified power of the engine rotor rotation frequency, while the value of the preset power is determined depending on the temperature of the motor stator windings, calculated by a model or measured by a temperature sensor, and can have three fixed values: 1) P_s=P_n; 2) P_s>P_n; 3) P_s<P_n, where P_s is the specified power, P_n is the nominal power of the engine; assignment for the stator flux linkage is determined in the first and second control zones on the basis of preliminary calculated value of ratio between the moment of stator flux linkage and the moment of the engine, providing the minimum value of the stator current at a set moment and having a shape of a curve with saturation.

EFFECT: provision of energy-efficient two-zone adjustment of asynchronous motor at more complete usage of engine in terms of heating and power.

1 cl, 2 dwg