THE METHOD OF TIME-CONSTANT DEVIATION DETERMINATION IN FREQUENCY CONTROL SYSTEMS OF A SQUIRREL-CAGE MOTOR AND THE SYSTEM FOR TIME-CONSTANT DEVIATION DETERMINATION IN FREQUENCY CONTROL SYSTEMS OF A SQUIRREL-CAGE MOTOR AND THEROTOR TIME-CONSTANT ADAPTATION SYSTEM IN CONTROL SYSTEMS OF A SQUIRREL-CAGE MOTOR

摘要

Rotor time-constant correction system in squirrel-cage motor frequency control systems containing a block which on the grounds of set component values of stator current being proportional to set flux and stator current being proportional to set moment determines a voltage signal and time-constant deviation determination block. The system is characterized by the fact that the block's output (BwR) is connected with the analogue input of digital-to-analogue converter (C/A), which has its digital input connected through a reverse counter (LR) connected in a cascade and a voltage retuned generator (GPN) with the output of the block which determines the rotor's time-constant deviation (BST), whereas the output of the digital-to-analogue converter constitutes an output of a signal of corrected deviation value (wRz).<IMAGE>