ОПРЕДЕЛЕНИЕ ЗАГРУЗКИ АСИНХРОННОГО ДВИГАТЕЛЯ С КОРОТКОЗАМКНУТЫМ РОТОРОМ В ПРОЦЕССЕ ЭКСПЛУАТАЦИИ

Abstract

In the agro-industrial complex, asynchronous electric motors with a squirrel-cage rotor are widely used in most technological processes. More than half of them are unevenly loaded, which leads to overspending of electricity or premature failure of the electric motor. Installation of engines in hard-to-reach places makes it difficult to access live parts to control their main indicators during operation, therefore, for rational operation and prevention of failures, it is required to develop a method for operational control of engine operation parameters without stopping the technological process. (Research purpose) The research purpose is substantiating the possibility of determining the load of an asynchronous electric motor by the frequency of rotation of the rotor shaft. (Materials and methods) A load bench for experimental studies was manufactured, consisting of an asynchronous motor with a squirrel-cage rotor and a DC generator of independent excitation. The research was carried out by loading the asynchronous motor with a generator for various values of the rotor speed, at which its main indicators were recorded. (Results and discussion) Graphs of current measurement, power factor and power consumption from engine rotor revolutions were presented. We analyzed the dynamics of changes in the main indicators of an asynchronous motor depending on its load. It was found that the studied indicators vary linearly depending on the engine speed with high approximation reliability. (Conclusions) Analytical dependencies were identified to determine the main engine indicators by rotor speed. It has been shown that the proposed method for determining the load is easy to use, since it is enough to measure the rotor speed and compare it with the nominal one, regardless of the technical characteristics of the engine.