Lamination Fault Detection in the Stator of an Electrical Machine using Flux Injection Method

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Journal Title
Journal ISSN
Volume Title
Sähkötekniikan korkeakoulu | Master's thesis
Date
2017-05-22
Department
Major/Subject
Electrical Drives
Mcode
S3016
Degree programme
AEE - Master’s Programme in Automation and Electrical Engineering (TS2013)
Language
en
Pages
48 + 7
Series
Abstract
In this thesis work, a probe was designed and developed for detecting lamination fault in the stator of an 18.5 kW induction machine, based on flux injection method. Two designs were developed based on the stator dimensions of the 18.5 kW induction machine and they were compared by analyzing those designs analytically in Matlab to implement the most viable design for detecting lamination failure in the machine. The injection probe for analyzing the lamination failure was demonstrated for two separate cases; Initially, lamination failure in a test stack was studied through experimentation by operating the probe at various range of frequencies and flux densities to select an optimal point of operation of the probe and then it was compared with the simulations in FEMM. Later, the experiments and simulations were done on the 18.5 kW induction machine at selected operating point from previous case to study the effect of fault on the probe. The simulations show a promising result for implementing this method for detecting the lamination failure in machine at higher frequencies. However, the results obtained from experiment were affected due to various inaccuracies caused during the construction of the probe. When the flux injection probes are manufactured with industrial standards, the factors causing these inaccuracies can be eliminated making the new flux injection method more reliable for detecting the lamination failure in an electrical machine.
Description
Supervisor
Arkkio, Antero
Thesis advisor
Bikram Shah, Sahas
Keywords
electrical machine, condition monitoring, lamination failure, fault detection, flux injection
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