METHOD FOR DETERMINING ELECTROMAGNETIC TIME CONSTANT OF SQUIRREL-CAGE ROTOR OF ASYNCHRONOUS MOTOR Russian patent published in 2009 - IPC H02P23/14 H02P21/14 G01R27/02 G01R31/34 

FIELD: electricity.

SUBSTANCE: in method for determining electromagnetic time constant of squirrel-cage rotor of asynchronous motor with rotor (ADKR), in order to determine current value of electromagnetic time constant of rotor, to the computing device there entered are design parametres of ADKR in the form of active resistance of stator winding and inductivity of magnetisation circuit, leakage coefficients of magnetic flows of stator and rotor in terms of stator current. During the process, there entered is information on the value of phase current and voltage and on phase displacement angle between voltage and current of stator winding. By means of computing device there determined is electromagnetic time constant of rotor by mathematical formula which is specified in application materials and which includes all the required parameters available for direct measurement in any ADKR mode.

EFFECT: providing economical and steady operation of variable-frequency electric drive on the basis of asynchronous motor with squirrel-cage rotor.

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