Diagnostika asynchronního motoru z radiálního rozptylového pole

Abstract

This thesis focuses on the diagnosis of an asynchronous motor from a radial scattering field. The aim of the thesis is to present different on-line methods of asynchronous motor diagnosis and to demonstrate some of them on a real motor. The thesis is divided into six chapters. The first chapter deals with the basic theory of diagnosis, explains the most important concepts and introduces the reader to the diagnosis of electrical machines. The second chapter focuses on asynchronous motor faults, describing the theory of their function and giving the frequency of occurrence of various faults. The third chapter covers various diagnostic methods such as thermal onslaught monitoring, vibration analysis, acoustic analysis, MCSA method, and the scattered field measurement method. In the fourth chapter, I have developed a FEM model of an asynchronous motor and simulate a broken rotor bar fault on it. This chapter also includes spectral analysis of the model outputs. In the fifth chapter, I discuss the practical measurement of an asynchronous motor with a specified fault and an unspecified fault. Here again, I perform spectral analysis and evaluate the health of the motors. The sixth chapter is the final chapter. The results of practical measurements and their evaluation are presented. The result of this thesis is an overview of the various methods of asynchronous motor diagnosis that are used to find the faults described in this thesis and the application of these methods to a real motor. The thesis also shows that it is possible to diagnose asynchronous motors using a combination of different methods and that these methods can be an effective tool for diagnosing electrical machines in general.