Of power consumption dual-zone speed control of induction motor direct torque control without encoder winding temperature

摘要

The invention relates to an asynchronous electric drive and may be used in industry and transport in the motor drive system with direct torque control of induction motors (BP). The system of the two-band regulation of asynchronous motor speed, using a direct torque control (Direct Torque Control - DTC), comprises a static voltage converter and the frequency with auxiliary voltage inverter feeding an induction motor, the engine speed sensor, phase currents of the sensors A, B, C of the engine, a sensor DC link voltage static converter, the direct torque controller (DTC), to the respective inputs of which signals fed the motor current sensor, the voltage sensor level constant first current and a first output connected to the control input of the static converter, wherein, in the DTC unit has adaptive engine model incorporating the thermal model and, based on that calculated temperature of the motor stator windings; further comprising a ramp-function generator is connected to the first input of the subtractor, the second input of which is fed a signal from the engine speed sensor and an output coupled to the input of the speed controller whose output is connected to the first input of the calculation of the torque reference, a second input coupled to an output the engine speed sensor and an output connected to the input torque command DTC unit. entered into the system:; given power calculating unit, the input of which is supplied the motor winding temperature signal from the second output DTC unit, and an output connected to a third input of the torque reference calculating unit and; The stator flux linkage reference block depending on the electromagnetic torque of the motor, which is fed to the input of the torque reference signal with the reference torque calculation unit, and an output connected to an input job flux DTC unit.