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Magnetic Field Computations and Energy Efficiency Studies in Electrical Machines, 2nd Edition

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

Deadline for manuscript submissions: 25 May 2026 | Viewed by 3680

Special Issue Editors


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Guest Editor
Department of Electrical Machines and Drives, Technical University of Cluj-Napoca, 28 Memorandumului Street, 400114 Cluj-Napoca, Romania
Interests: design of electric machines; numerical and analytical analysis; transverse flux machines; induction machines; transformers
Special Issues, Collections and Topics in MDPI journals
School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: multi-port electrical machines and drive systems; power electronics; power systems; renewable generation

Special Issue Information

Dear Colleagues,

We are pleased to share the success of our Special Issue “Magnetic Field Computations and Energy Efficiency Studies in Electrical Machines” with 13 publications in total.

https://www.mdpi.com/journal/energies/special_issues/Magnetic_Field_Computations.

We are now preparing to launch the second volume of this Special Issue and are pleased to invite you to submit papers to Energies.

The need for the efficient and high-density power electric machines has led to the study of various new topologies and optimization of the classic ones. The use of numerical analysis has become a regularly used tool for the evaluation of the performance of the electrical machines. Also, the employment of various analytical models represents an important tool for the above mentioned purpose. In this context, the studies on these topics are always of interest for the researchers in this domain.

This Special Issue aims to publish researches on different topologies of electrical machines, based mainly on, but not limited to Magnetic Field Computations and Energy Efficiency Studies. These analyses are challenging for the researchers as efficiency increases cannot be achieved without finding innovative solutions. Also, analytical and numerical analyses are always subject to approaches leading to remarkable progress in the study of the electrical machines. Given the above considerations, topics of interest are:

  • Innovative design of rotary and linear machines, with or without permanent magnets;
  • Techniques for optimization;
  • Analytical and numerical electromagnetic analysis;
  • Application of new magnetic materials;
  • Thermal and mechanical simulations;
  • Control strategies;
  • Noise, vibration and heat analysis;
  • Energy Efficiency Studies;
  • Energetical Optimisation Analysis.

Dr. Dan-Cristian Popa
Dr. Yi Liu
Guest Editors

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 250 words) can be sent to the Editorial Office for assessment.

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.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 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

  • transverse flux machines
  • magnetic field
  • numerical analysis
  • novel topology
  • optimized design
  • new magnetic materials
  • losses calculations control algorithm NVH (noise, vibration, and harshness) thermal field analysis energy efficiency otimisation study

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Related Special Issue

Published Papers (4 papers)

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Research

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15 pages, 2797 KB  
Article
Coordinated Control of Standalone Brushless Doubly-Fed Induction Generator for Load Disturbance Suppression in Microgrid
by Wei Luo, Yan Le, Minglei Xie, Yi Liu and Dayi Li
Energies 2026, 19(2), 464; https://doi.org/10.3390/en19020464 - 17 Jan 2026
Viewed by 240
Abstract
The anti-load-disturbance capability is one of the most important capabilities in a microgrid. In comparison with the grid-connected brushless doubly-fed induction generator (BDFIG), the output voltage of the standalone BDFIG in a microgrid is more susceptible to load disturbances. In order to address [...] Read more.
The anti-load-disturbance capability is one of the most important capabilities in a microgrid. In comparison with the grid-connected brushless doubly-fed induction generator (BDFIG), the output voltage of the standalone BDFIG in a microgrid is more susceptible to load disturbances. In order to address this issue, this paper presents a coordinated control method based on both the machine side converter (MSC) and line side converter (LSC) to reduce the amplitude of power winding (PW) voltage fluctuation and shorten transient response time, so as to significantly reduce the influence of the load disturbance on the output voltage under the limited power converter capacity. The proposed control strategy is validated through experiments conducted on a 3 kW wound-rotor BDFIG. Full article
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17 pages, 12078 KB  
Article
Investigation of Design Parameters for Improving Efficiency in Interior Permanent Magnet Synchronous Machines
by Soo-Jin Lee, Seok-Hyeon Eom, Manh-Dung Nguyen, Jun-Ho Jang, Yeon-Tae Choi, Dae-Hyun Lee, Jang-Young Choi and Kyung-Hun Shin
Energies 2025, 18(18), 4971; https://doi.org/10.3390/en18184971 - 18 Sep 2025
Cited by 1 | Viewed by 1109
Abstract
This study focuses on improving the efficiency of interior permanent magnet synchronous motors (IPMSMs) for electric vehicle (EV) compressors. Seven rotor topologies (B, dB, V, dV, D, U, and UV) were first compared, among which the U-type rotor demonstrated the highest efficiency and [...] Read more.
This study focuses on improving the efficiency of interior permanent magnet synchronous motors (IPMSMs) for electric vehicle (EV) compressors. Seven rotor topologies (B, dB, V, dV, D, U, and UV) were first compared, among which the U-type rotor demonstrated the highest efficiency and the lowest total loss. Subsequently, the influence of the turn number and rotor outer diameter (ROD) on the shift of the high-efficiency region was analyzed, and six key design variables were identified through Pearson correlation-based sensitivity analysis. Using these variables, a multi-objective optimization was performed in Ansys OptiSLang, which improved the integrated part load value (IPLV)-weighted efficiency from 91.05% to 92.29% and shifted the high-efficiency region closer to the main operating point. Experimental validation of the reference model confirmed the reliability of the FEM analysis, and the proposed optimal design is expected to enhance low-speed efficiency and reduce battery energy consumption in EV compressor applications. Full article
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14 pages, 4531 KB  
Article
A Permanent Magnet Synchronous Machine with Mechanically Controlled Excitation Flux
by Piotr Paplicki
Energies 2025, 18(17), 4781; https://doi.org/10.3390/en18174781 - 8 Sep 2025
Viewed by 966
Abstract
This paper presents the initial design of a permanent magnet synchronous machine with mechanically controlled excitation flux using the linear sliding motion of an additional excitation source placed inside a hollow shaft in the rotor. A new rotor design concept and assembling method [...] Read more.
This paper presents the initial design of a permanent magnet synchronous machine with mechanically controlled excitation flux using the linear sliding motion of an additional excitation source placed inside a hollow shaft in the rotor. A new rotor design concept and assembling method are described and presented in detail. On the basis of 3D-FE analysis results, the principle of adjusting reluctance, magnetic flux distribution, flux linkage, field weakening rate, no-load back EMF waveforms, electromagnetic torque, magnetic tension, and the effectiveness of the excitation adjustment of the presented machine design are discussed. The presented machine concept enables the design of permanent magnet excited machines with a good flux control range operating in changing load conditions under variable rotor speed. Full article
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Review

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24 pages, 861 KB  
Review
A Review of Subdomain Models for Design of Electric Machines: Opportunities and Challenges
by Orwell Madovi and Shanelle N. Foster
Energies 2026, 19(1), 222; https://doi.org/10.3390/en19010222 - 31 Dec 2025
Viewed by 802
Abstract
The global transition toward electrification has accelerated the need for high-performance, sustainable electric machine designs. Emerging manufacturing techniques, particularly additive manufacturing, have enabled the development of complex and unconventional machine topologies. Designing novel machine topologies often relies on data-driven methods and topology optimization, [...] Read more.
The global transition toward electrification has accelerated the need for high-performance, sustainable electric machine designs. Emerging manufacturing techniques, particularly additive manufacturing, have enabled the development of complex and unconventional machine topologies. Designing novel machine topologies often relies on data-driven methods and topology optimization, which can be computationally intensive. Semi-analytic modeling offers an effective middle ground by balancing computational efficiency with modeling accuracy—positioned between fully analytical formulations and resource-intensive numerical simulations. While its advantages are recognized, the current literature lacks a unified overview of semi-analytic approaches applied across coupled multiphysics domains, including electromagnetic, thermal, and structural analyses. This paper addresses that gap by presenting a comprehensive review of recent semi-analytic modeling techniques relevant to electric machine design. The goal is to establish a foundational reference for researchers aiming to incorporate these models into advanced topology optimization frameworks. Full article
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