Special Issue "Magnetic Field Computations and Energy Efficiency Studies in Electrical Machines"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Electrical Power and Energy System".

Deadline for manuscript submissions: 19 November 2021.

Special Issue Editors

Assoc. Prof. Dr. Dan-Cristian Popa
E-Mail Website
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
Prof. Dr. Emil Cazacu
E-Mail Website
Guest Editor
University POLITEHNICA of Bucharest, Romania
Interests: numerical computation, power quality investigations, energy efficiency studies, electromagnetic levitation, transformers operating analysis

Special Issue Information

Dear colleagues,

The need for the efficient and high density power electric machines has led to study of various new topologies and optimization of the classic ones. The use of numerical analysis has become a regular used tool for the evaluation of the performances 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 progresses 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

Assoc. Prof. Dr. Dan-Cristian Popa
Prof. Dr. Emil Cazacu
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 papers will be 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. 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 2000 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.


  • 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

Published Papers (1 paper)

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High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique
Energies 2021, 14(15), 4427; https://doi.org/10.3390/en14154427 - 22 Jul 2021
Viewed by 168
This paper presents a new high-efficient three-phase brushless wound rotor synchronous machine (BL-WRSM) based on a sub-harmonic field excitation technique. In the proposed machine topology, the stator is equipped with two different three-phase windings: (1) main armature winding, and (2) additional armature winding. [...] Read more.
This paper presents a new high-efficient three-phase brushless wound rotor synchronous machine (BL-WRSM) based on a sub-harmonic field excitation technique. In the proposed machine topology, the stator is equipped with two different three-phase windings: (1) main armature winding, and (2) additional armature winding. The main armature winding is based on a 4-pole winding configuration, whereas the additional armature winding is based on a 2-pole winding configuration. Both windings are supplied current from two different inverters, i.e., inverter-1, inverter-2, and simultaneously. Inverter-1 provides the regular input current to the main armature winding, whereas inverter-2 provides a three-phase current of low magnitude to the 2-pole additional armature winding. This generates an additional sub-harmonic component of MMF in the airgap beside the fundamental MMF. On the other side, the rotor is equipped with (1) harmonic, and (2) field windings. These windings are electrically coupled via a rectifier. The fundamental component of MMF produces the main rotating magnetic field, whereas the sub-harmonic MMF gets induced in the harmonic winding to produce harmonic current. This current is rectified to give DC to the rotor field winding to attain brushless operation. To authenticate the operation and analyze its performance, the proposed BL-WRSM topology is supported using 2-D finite element analysis (FEA) in JMAG-Designer. Later on, the performance of the proposed brushless topology is compared with the customary BL-WRSM topology to verify its high efficiency, high output torque, low torque ripple, and low unbalanced radial force on the rotor. Full article
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