PROCEDURE DETERMINING INDUCTIVE IMPEDANCE OF AC ELECTRIC MOTORS Russian patent published in 2002 - IPC

FIELD: electrical engineering, control over synchronous and asynchronous motors in process of laboratory determination of their parameters. SUBSTANCE: procedure of determining inductive impedance of AC motor intermittent gradual voltage formed with the aid of inverter with rectangular-stepped form of output voltage is fed to electric motor. First derivative of phase current of electric motor is found in addition in start and end points of mated commutation intervals of inverter. Inductive impedance is determined by supply voltage of inverter and in addition by first derivatives of phase current while electric motor runs. EFFECT: reduced time of determination of inductive impedance of motor. 2 dwg