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Challenge and Research Trends of Rotating Electric Machines

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (28 January 2022) | Viewed by 8845

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Special Issue Editors

Prof. Dr. Vasile Marinca

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Guest Editor

Center for Fundamental Technical Research, Romanian Academy, 300222 Timisoara, Romania
Interests: analytical approaches to dynamical systems; rotating electrical machines

Dr. Nicolae Herisanu

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Guest Editor

Faculty of Mechanics, University Politehnica Timisoara, 300222 Timisoara, Romania
Interests: nonlinear dynamical systems; rotating electric machines
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Special Issue Information

Dear Colleagues,

Rotating electric machines are widely used nowadays as energy conversion machines, either to convert electrical energy into mechanical energy or vice versa. Starting from the reality that rotating electric machines exhibit both electrical and mechanical problems in their exploitation, this Special Issue of Energies focuses on the newest developments and research trends of both the mechanical and electrical aspects implicit in good functioning rotating electric machines.

Articles on any aspect of rotating electric machines are welcome, whether incorporating analytical investigations, numerical simulations, experimental approaches, or a combination of these tools. This should be intended to advance the state-of-the-art of the modeling, design, construction and exploitation of rotating electric machines.

Prof. Dr. Vasile Marinca
Prof. Dr. Nicolae Herisanu
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

Electric machine dynamics
Permanent magnet synchronous machine
Induction machine
Design, testing and monitoring of rotating machines
Performance evaluation
Rotor dynamics

Published Papers (5 papers)

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Research

12 pages, 1309 KiB

Open AccessArticle

Approximate Analytical Solutions to Nonlinear Oscillations of Horizontally Supported Jeffcott Rotor

by Vasile Marinca and Nicolae Herisanu

Energies 2022, 15(3), 1122; https://0-doi-org.brum.beds.ac.uk/10.3390/en15031122 - 03 Feb 2022

Viewed by 1244

Abstract

The present paper focuses on nonlinear oscillations of a horizontally supported Jeffcott rotor. An approximate solution to the system of governing equations having quadratic and cubic nonlinearities is obtained in two cases of practical interest: simultaneous and internal resonance. The Optimal Auxiliary Functions Method is employed in this study, and each governing differential equation is reduced to two linear differential equations using the so-called auxiliary functions involving a moderate number of convergence-control parameters. Explicit analytical solutions are obtained for the first time in the literature for the considered practical cases. Numerical validations proved the high accuracy of the proposed analytical solutions, which may be used further in the study of stability and in the design process of some highly performant devices. Full article

(This article belongs to the Special Issue Challenge and Research Trends of Rotating Electric Machines)

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26 pages, 3199 KiB

Open AccessArticle

Sliding-Mode-Based Current and Speed Sensors Fault Diagnosis for Five-Phase PMSM

by Yemna Bensalem, Abdellah Kouzou, Rabeh Abbassi, Houssem Jerbi, Ralph Kennel and Mohamed Abdelrahem

Energies 2022, 15(1), 71; https://0-doi-org.brum.beds.ac.uk/10.3390/en15010071 - 22 Dec 2021

Cited by 15 | Viewed by 2433

Abstract

The present paper deals with an active fault-tolerant speed tracking of a five-phase permanent magnet synchronous motor with currents and speed sensor failures. The active fault tolerant control scheme, integrating a sliding mode observer and backstepping controllers, is proposed to provide a continuous drive operation of the five-phase permanent magnet synchronous motor, even during more than one sensor fault occurrence. The sliding mode observer is designed to generate the residual signal necessary for the detection stage, whereas speed and current backstepping controllers handle the operation of the five-phase permanent magnet synchronous motor thanks to their ability to consider the nonlinearities of the system model in generating a control law that is robust enough in healthy and faulty cases. Furthermore, the FTC strategy uses the information received from the fault-tolerant switching block in terms of the measured and the observed currents and speed signals. To gain the maximum benefit of the sliding mode observer’s robustness to random noises and its ease of implementation, the observed currents and speed of the five-phase permanent magnet synchronous motor have been estimated. The simulation results are conducted to show the effectiveness of the proposed FTC control scheme and to prove its high performance in fault detection and tolerant control for the five-phase permanent magnet synchronous motor, since it significantly outperforms the performance provided by traditional methods. Full article

(This article belongs to the Special Issue Challenge and Research Trends of Rotating Electric Machines)

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15 pages, 3440 KiB

Open AccessArticle

Analytical Study of Nonlinear Vibration in a Rub-Impact Jeffcott Rotor

by Nicolae Herisanu and Vasile Marinca

Energies 2021, 14(24), 8298; https://0-doi-org.brum.beds.ac.uk/10.3390/en14248298 - 09 Dec 2021

Cited by 2 | Viewed by 1549

Abstract

The purpose of this work is to explore the nonlinear vibration of a rub-impact Jeffcott rotor. In the first stage, the motion is not affected by the friction force, but in the second stage, the motion is influenced by the normal force and the friction force. The governing equations of the rotor of this model are derived in this paper. In consequence, there appears a difference between the two stages. We establish an approximate analytical solution for nonlinear vibrations corresponding to two stages with the mention of the location of jumps. The obtained results are compared with the numerical integration results. The steady-state response and the stability of the solutions are analytically determined for the two stages. The stability of a full annular rub solution is studied with the help of the Routh–Hurwitz criterion. Effects of different parameters of the system, the saddle-node bifurcation (turning points) and the Hopf bifurcation are presented. The main contribution lies in the analytical approximation solution based on the Optimal Auxiliary Functions Method. Full article

(This article belongs to the Special Issue Challenge and Research Trends of Rotating Electric Machines)

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18 pages, 7210 KiB

Open AccessArticle

Video Image Correlation-Based Method Used for the Study of the Torsional Vibrations of an Adder Gearbox

by Ioan Száva, Botond Pál-Gálfi, Carol Ambrus and Sorin Vlase

Energies 2021, 14(19), 6129; https://0-doi-org.brum.beds.ac.uk/10.3390/en14196129 - 26 Sep 2021

Cited by 1 | Viewed by 1200

Abstract

In this paper, a study of the vibrations that appear in the transmission shafts of an adder gearbox used for a heavy truck is made. The truck has two engines on only one chassis and the power offered by these engines is summated and transmitted to the truck or the working machine. This type of transmission is used for oil production installation for the army. During the transportation of the installation to the workplace, only one engine is running, after mounting installation, both engines are running. This paper studies the vibrations of the adder gearbox, a complex construction, subjected to multiple operating requirements. In this regard, the authors first performed accuracy (accuracy) tests of the VIC 3D system on an original experimental mini-stand. Measurements performed on a mini disc demonstrated the validity and accuracy of the method, even if the cameras used were not high resolution. The authors applied the same principle in the case of the adder box from the truck, obtaining useful results for those in the field. The experimental method uses the facilities of a contactless optical measurement method (VIC-3D), which provides a high-accuracy quantitative linear and angular vibration analysis. The VIC measurement method offers, based on a frontal viewing of the disk during the resonance phenomenon and by simple calculus on the monitored linear displacements, the corresponding angular amplitude. Full article

(This article belongs to the Special Issue Challenge and Research Trends of Rotating Electric Machines)

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Graphical abstract

17 pages, 4311 KiB

Open AccessArticle

Mathematical Modelling of Transient Processes in an Asynchronous Drive with a Long Shaft Including Cardan Joints

by Andriy Chaban, Zbigniew Łukasik, Andrzej Popenda and Andrzej Szafraniec

Energies 2021, 14(18), 5692; https://0-doi-org.brum.beds.ac.uk/10.3390/en14185692 - 10 Sep 2021

Cited by 13 | Viewed by 1707

Abstract

Beginning with the classic methods, a mathematical model of an electromechanical system is developed that consists of a deep bar cage induction motor that, via a complex motion transmission with distributed mechanical parameters, drives a working machine, loading the drive system with a constant torque. The electromagnetic field theory serves to create the motor model, which allows addressing the displacement of current in the rotor cage bars. Ordinary and partial differential equations are used to describe the electromechanical processes of energy conversion in the motor. The complex transmission of the drive motion consists of a long shaft with variable geometry cardan joints mounted on its ends. Non-linear electromechanical differential equations are presented as a system of ordinary differential equations combined with a mixed problem of Dirichlet first-type and Poincaré third-type boundary conditions. This system of equations is integrated by discretising partial derivatives by means of the straight-line methods and successive integration as a function of time using the Runge–Kutta fourth-order method. Starting from there, complicated transient processes in the drive system are analysed. Results of computer simulations are presented in the graphic form, which is analysed. Full article

(This article belongs to the Special Issue Challenge and Research Trends of Rotating Electric Machines)

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