DefinePK

Abstract

Characteristics of the three-phase induction motors can be analized by using a conventional equivalent circuit. The parameters of the circuit can be obtained through of several experiment's results in the laboratory such as dc test, no-load test, and blocked-rotor test. All data must be gotten accurately if they are used for predicting the characteristics of the three-phase induction motor. If one data is not gotten accurately, the characteristics of the motor can not be predicted accurately. This study is purposed to give a simple equivalent circuit for analyzing the characteristics of the 3-phase induction motors by using only the nameplate and the no-load test data of the motor. So, the blocked-rotor test and dc test of the motor are not required for the purposed circuit. This study is focused to discuss about the line current and power factor of the three-phase induction motor. The object used in this study was the 3-phase induction motor of 1.5 HP, 380/220V, Y/?, 2.7/4.7 A, 4 poles, 50 Hz, 1400 RPM. The results of this study show that the equivalent circuit proposed in this study can be used to predict the characteristics of the three-phase induction motor, especially the input current and power factor of the motor with an accurate rate above 90%.