TORQUE CALCULATING METHOD OF AN INDUCTION MOTOR USING A CURRENT SPECTRUM AND A SYSTEM USING THE SAME, FAILURE DIAGNOSTIC METHOD AND A SYSTEM USING THE SAME CAPABLE OF IMPROVING THE RELIABILITY OF MEASUREMENT AND OVERCOMING THE RESTRICTION OF MEASUREMENT

摘要

PURPOSE: A torque calculating method of an induction motor using a current spectrum and a system using the same, failure diagnostic method and a system using the same are provided to accurately diagnose the failure of an induction motor by measuring the torque using a current spectrum of a stator and a rotor.;CONSTITUTION: A torque calculating method of an induction motor using a current spectrum and a failure diagnostic method comprise the following steps. The effective power of an induction motor is produced. The effective power is produced using the equivalent model of the induction motor based on the current and voltage of a stator and a rotor. The actual rotation speed of the induction motor is obtained. The torque of the induction motor is produced. The failure of the induction motor is determined considering the tolerance range of pre-set torque and the calculated torque of the induction motor.;COPYRIGHT KIPO 2012