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Machines
Special Issues
Modern Electrical Machines and Their Applications
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Modern Electrical Machines and Their Applications

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Machines Testing and Maintenance".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 2950

Special Issue Editor

Dr. Stefan Breban

E-Mail Website
Guest Editor
Department of Electric Machines and Drives, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania
Interests: electrical engineering; wind turbines; electric vehicles
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electrical machines are now increasingly important as they are used more and more in electric mobility and renewable energy.Their efficiency is vastly superior to combustion engines, and it seems that little can be done to improve them. However, with the use of new materials, higher efficiency and an increased power/weight ratio can be obtained. Additionally, many researchers are investigating solutions to obtain high-efficiency electrical machines without the use of permanent magnets.

Modern electrical machines should have the following characteristics: reliable, cheap, efficient, and lightweight. Of course, power electronic converters and control strategies are now critical to obtain a high-performance electric drive.

This Special Issue covers all applications where electrical machines and drives are important components. Aspects related to mathematical modeling, optimization, numerical methods, and experimental validation are sought to be presented. The applications of such systems include, but are not limited to, electric mobility, renewable energy (wind power plants, hydroelectric power stations), industry, home appliances, etc.

Dr. Stefan Breban
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Machines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • electrical machines and drives
  • electric mobility
  • wind turbines
  • hydroelectric power units
  • optimization
  • control
  • power converters

Published Papers (2 papers)

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Research

19 pages, 6391 KiB  
Article
Replacing Induction Motors without Defined Efficiency Class by IE Class: Example of Energy, Economic, and Environmental Evaluation in 1.5 kW—IE3 Motors
by Marcel Torrent, Balduí Blanqué and Lluís Monjo
Machines 2023, 11(5), 567; https://doi.org/10.3390/machines11050567 - 19 May 2023
Cited by 2 | Viewed by 1285
Abstract
This paper shows the results obtained from the study on the variables that have the greatest influence on the decision to replace three-phase induction motors, without a defined efficiency class and installed in industrial applications, with IE3 efficiency class induction motors. The work [...] Read more.
This paper shows the results obtained from the study on the variables that have the greatest influence on the decision to replace three-phase induction motors, without a defined efficiency class and installed in industrial applications, with IE3 efficiency class induction motors. The work has been carried out on motors with a nominal power of 1.5 kW due to the availability of laboratory tests that have allowed us to accurately quantify the selected study variables. According to IEC 60034-30, between 0.75 kW and 4 kW is the greatest potential for energy savings in electric motors installed within the industrial sector. The tests carried out have made it possible to assess different operating conditions of the motor: direct power supply from the grid, electronic power supply using scalar control, and electronic power supply using direct torque control. The study has focused on three aspects: energy evaluation, assessing the savings potential; economic evaluation, based on indicators such as Payback Period and Net Present Value; environmental assessment, quantifying the impact indicators proposed by the Methodology for Ecodesign of Energy-related Products (MEErP). A sensitivity analysis has been carried out to quantify, through ratios, different operating points from those directly analyzed in the article. Full article
(This article belongs to the Special Issue Modern Electrical Machines and Their Applications)
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13 pages, 3206 KiB  
Article
Stress-Dependent Magnetic Equivalent Circuit for Modeling Welding Effects in Electrical Steel Laminations
by Andries Daem, Mohamed N. Ibrahim, Peter Sergeant and Luc Dupré
Machines 2022, 10(12), 1153; https://doi.org/10.3390/machines10121153 - 02 Dec 2022
Cited by 1 | Viewed by 1059
Abstract
Welding has a severe impact on the efficiency of electrical machines. The heat added during the welding process affects the microstructure of the material and causes residual stress. This results in local degradation of the magnetic permeability and facilitates additional iron losses in [...] Read more.
Welding has a severe impact on the efficiency of electrical machines. The heat added during the welding process affects the microstructure of the material and causes residual stress. This results in local degradation of the magnetic permeability and facilitates additional iron losses in the machine core. With the purpose of modeling and simulating welding effects in electric machines, this paper proposes a stress-dependent magnetic equivalent circuit (MEC) model for welded non-grain-oriented electrical steel laminations. A modified iron loss model is proposed to accommodate these welding effects. Furthermore, the proposed MEC model is applied to a M270-35A stator core as a case study. It was demonstrated that the core losses increase by 25% when four welding joints are applied. With a limited number of magnetic measurements on a welded and unwelded core, the model can be fully parametrized. Finally, the model was successfully validated on a core with eight welding seams at 100 Hz. The proposed model can be integrated into the design of electric machines to consider the welding effects. Full article
(This article belongs to the Special Issue Modern Electrical Machines and Their Applications)
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