EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINES

Usually, electrical machines have a metallic cylinder made up of a compacted stack of thin metal plates (referred as laminated core) assembled with an interference fit on the shaft. The laminated structure is required to improve the electrical performance of the machine and, besides adding inertia,...

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Main Authors: HIDERALDO L. V. SANTOS, MARCO A. LUERSEN, CARLOS A. BAVASTRI
Format: Article
Language:English
Published: Taylor's University 2013-08-01
Series:Journal of Engineering Science and Technology
Subjects:
Online Access:http://jestec.taylors.edu.my/Vol%208%20Issue%204%20August%2013/Volume%20(8)%20Issue%20(4)%20457-471.pdf
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spelling doaj-76b7d0119fdb419a828e01376d1766472020-11-24T23:55:32ZengTaylor's UniversityJournal of Engineering Science and Technology1823-46902013-08-0184457471EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINESHIDERALDO L. V. SANTOSMARCO A. LUERSENCARLOS A. BAVASTRIUsually, electrical machines have a metallic cylinder made up of a compacted stack of thin metal plates (referred as laminated core) assembled with an interference fit on the shaft. The laminated structure is required to improve the electrical performance of the machine and, besides adding inertia, also enhances the stiffness of the system. Inadequate characterization of this element may lead to errors when assessing the dynamic behavior of the rotor. The aim of this work was therefore to evaluate three beam models used to represent the laminated core of rotating electrical machines. The following finite element beam models are analyzed: (i) an “equivalent diameter model”, (ii) an “unbranched model” and (iii) a “branched model”. To validate the numerical models, experiments are performed with nine different electrical rotors so that the first non-rotating natural frequencies and corresponding vibration modes in a free-free support condition are obtained experimentally. The models are evaluated by comparing the natural frequencies and corresponding vibration mode shapes obtained experimentally with those obtained numerically. Finally, a critical discussion of the behavior of the beam models studied is presented. The results show that for the majority of the rotors tested, the “branched model” is the most suitablehttp://jestec.taylors.edu.my/Vol%208%20Issue%204%20August%2013/Volume%20(8)%20Issue%20(4)%20457-471.pdfRotordynamicsLaminated coreElectrical machinesNatural frequencies
collection DOAJ
language English
format Article
sources DOAJ
author HIDERALDO L. V. SANTOS
MARCO A. LUERSEN
CARLOS A. BAVASTRI
spellingShingle HIDERALDO L. V. SANTOS
MARCO A. LUERSEN
CARLOS A. BAVASTRI
EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINES
Journal of Engineering Science and Technology
Rotordynamics
Laminated core
Electrical machines
Natural frequencies
author_facet HIDERALDO L. V. SANTOS
MARCO A. LUERSEN
CARLOS A. BAVASTRI
author_sort HIDERALDO L. V. SANTOS
title EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINES
title_short EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINES
title_full EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINES
title_fullStr EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINES
title_full_unstemmed EXPERIMENTAL EVALUATION OF NUMERICAL MODELS TO REPRESENT THE STIFFNESS OF LAMINATED ROTOR CORES IN ELECTRICAL MACHINES
title_sort experimental evaluation of numerical models to represent the stiffness of laminated rotor cores in electrical machines
publisher Taylor's University
series Journal of Engineering Science and Technology
issn 1823-4690
publishDate 2013-08-01
description Usually, electrical machines have a metallic cylinder made up of a compacted stack of thin metal plates (referred as laminated core) assembled with an interference fit on the shaft. The laminated structure is required to improve the electrical performance of the machine and, besides adding inertia, also enhances the stiffness of the system. Inadequate characterization of this element may lead to errors when assessing the dynamic behavior of the rotor. The aim of this work was therefore to evaluate three beam models used to represent the laminated core of rotating electrical machines. The following finite element beam models are analyzed: (i) an “equivalent diameter model”, (ii) an “unbranched model” and (iii) a “branched model”. To validate the numerical models, experiments are performed with nine different electrical rotors so that the first non-rotating natural frequencies and corresponding vibration modes in a free-free support condition are obtained experimentally. The models are evaluated by comparing the natural frequencies and corresponding vibration mode shapes obtained experimentally with those obtained numerically. Finally, a critical discussion of the behavior of the beam models studied is presented. The results show that for the majority of the rotors tested, the “branched model” is the most suitable
topic Rotordynamics
Laminated core
Electrical machines
Natural frequencies
url http://jestec.taylors.edu.my/Vol%208%20Issue%204%20August%2013/Volume%20(8)%20Issue%20(4)%20457-471.pdf
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AT carlosabavastri experimentalevaluationofnumericalmodelstorepresentthestiffnessoflaminatedrotorcoresinelectricalmachines
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