METHOD OF ENERGY-EFFICIENT ASYNCHRONOUS ELECTRIC DRIVE SPEED CONTROL WITH FLEXIBLE POWER LIMITATION Russian patent published in 2016 - IPC H02P21/10 H02P21/12 H02P27/06 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used in industry and transport in electric drive systems with asynchronous motors (AM) direct torque control. Method of induction motor speed dual-zone regulation, using direct torque control. In method of asynchronous electric drive speed dual-zone control determination of torque setting limit, calculated by speed controller, is carried out by dividing preset power to engine rotor speed, wherein preset power value is determined depending on motor stator winding temperature, calculated according to model or measured by temperature sensor, according to following formula: , where P_s is preset power, P_n is motor nominal power; θ_adm is stator winding admissible temperature; t⁰ is current winding temperature, and assignment for stator flux linkage is determined in first and second zones of control according to assignment for torque value based on calculated dependency of stator flux linkage from motor torque, providing stator current minimum value at specified torque and having form of curve with saturation.

EFFECT: technical result is enabling asynchronous motor dual-zone control in direct torque control system with more complete usage of motor by heating and power.

1 cl, 2 dwg