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Journal articles on the topic 'Electrical machines'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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1

Podgornovs, Andrejs, and Anton Sipovics. "Electromechanical Battery, Electrical Machines Mass Functions Analysis." Scientific Journal of Riga Technical University. Power and Electrical Engineering 28, no. 1 (January 1, 2011): 53–57. http://dx.doi.org/10.2478/v10144-011-0009-7.

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Electromechanical Battery, Electrical Machines Mass Functions AnalysisIn this paper different types of electrical machines in electromechanical battery, were described. The most known manufactured battery data is composed. Three types of machines: synchronous machine with salient poles and electromagnetic excitation, with permanent magnets on rotor and reluctance synchronous machine were analyzed. For all types of machines, mass is function of general geometrical size of magnetic system and machines electrical power.

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2

Fairney, W. "Electrical Machines." Electronics and Power 32, no. 2 (1986): 169. http://dx.doi.org/10.1049/ep.1986.0093.

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3

Gerada, David, Xuzhen Huang, Chengming Zhang, He Zhang, Xiaochen Zhang, and Chris Gerada. "Electrical Machines for Automotive Electrically Assisted Turbocharging." IEEE/ASME Transactions on Mechatronics 23, no. 5 (October 2018): 2054–65. http://dx.doi.org/10.1109/tmech.2018.2849081.

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4

Silwal, Bishal, and Peter Sergeant. "Thermally Induced Mechanical Stress in the Stator Windings of Electrical Machines." Energies 11, no. 8 (August 14, 2018): 2113. http://dx.doi.org/10.3390/en11082113.

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The lifetime of an electrical machine mainly depends on the thermal overloading. Modern day applications of electrical machines on one hand require compact machines with high power density, while on the other hand force electrical machines to undergo frequent temperature cycling. Until recently, in the case of electrical machines, the main factor related to the degradation of the winding insulation was thought to be the thermal oxidization of the insulation materials. It has now been revealed that thermal overloading can also induce mechanical stress in the windings of electrical machines, which over time could lead to fatigue and degradation. In this paper, a comprehensive study of the thermally induced mechanical stress in the windings of an electrical machine is presented. The study is performed using combined thermo-mechanical models. The numerical results are validated by experiments on a segmented stator winding set-up.

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5

Karthaus, Jan, Benedikt Groschup, Robin Krüger, and Kay Hameyer. "Mechanical stress distribution and the utilisation of the magneto-elastic effect in electrical machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1085–97. http://dx.doi.org/10.1108/compel-10-2018-0387.

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Purpose Due to the increasing amount of high power density high-speed electrical machines, a detailed understanding of the consequences for the machine’s operational behaviour and efficiency is necessary. Magnetic materials are prone to mechanical stress. Therefore, this paper aims to study the relation between the local mechanical stress distribution and magnetic properties such as magnetic flux density and iron losses. Design/methodology/approach In this paper, different approaches for equivalent mechanical stress criteria are analysed with focus on their applicability in electrical machines. Resulting machine characteristics such as magnetic flux density distribution or iron are compared. Findings The study shows a strong influence on the magnetic flux density distribution when considering the magneto-elastic effect for all analysed models. The influence on the iron loss is smaller due to a high amount of stress-independent eddy current loss component. Originality/value The understanding of the influence of mechanical stress on dimensions of electrical machines is important to obtain an accurate machine design. In this paper, the discussion on different equivalent stress approaches allows a new perspective for considering the magneto-elastic effect.

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6

MIKI, Ichiro. "ICEMS : International Conference on Electrical Machines and Systems." Journal of the Institute of Electrical Engineers of Japan 136, no. 4 (2016): 217–19. http://dx.doi.org/10.1541/ieejjournal.136.217.

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Bobba, Phaneendra Babu, G. Sandhya Rani, and Burra Sujan Goud. "A Comparative Study on Conventional and Superconducting Electrical Machines." E3S Web of Conferences 391 (2023): 01211. http://dx.doi.org/10.1051/e3sconf/202339101211.

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This paper investigates the potential benefits of utilizing superconducting materials in machines. The project focuses on replacing the conventional copper windings with superconducting materials in a machine. The machine is modelled and simulated using ANSYS software, both with conventional copper windings and with superconducting windings. A 3.7kw and 11kw 3 phase Induction machines are simulated with YBCO material applied to stator and rotor windings. The results show that the use of superconducting materials in the machine windings can significantly reduce energy losses and improve machine efficiency by 1 to 10%. Overall, the study suggests that superconducting machines offer a promising avenue for improving energy efficiency and reducing operating costs.

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Sahin, Cihan. "Comparison of Aluminum and Copper Winding Materials for Switched Reluctance Machines with Finite Element Analysis." Ingeniería e Investigación 43, no. 2 (May 16, 2023): e102038. http://dx.doi.org/10.15446/ing.investig.102038.

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Today, with the decrease in fossil fuel reserves, interest in electric vehicles has grown. Undoubtedly, electric machines are one of the most important parts of electric vehicles. Studies on electrical machines directly affect vehicle performance. Since the electrical machine used is mounted on the vehicle, reducing the total weight without changing the output power will positively affect the overall performance of the vehicle. The windings used to create the magnetic field in electrical machines are made of copper. Electrical machinery manufacturers try to use completely different materials instead of copper or partially reduce its use. At this point, aluminum emerges as an attractive material for various manufacturers. This study analyzed the winding structure of a switched reluctance machine (SRM) proposed for an electric vehicle by using copper and aluminum at an equivalent resistance value, the results of which were compared. As a result of a 2D finite element analysis, it was observed that the machine’s output performance is largely kept when aluminum is used instead of copper for the winding. It was also observed that the aluminum total winding weight decreased by 43,40% compared to that of copper.

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Douine, Bruno, Hocine Menana, Kevin Berger, Jean Lеvеque, Konstantin Kovalev, and Nikolay Ivanov. "Overview of High Temperature Superconductor Machines." Elektrichestvo 4, no. 4 (2021): 25–33. http://dx.doi.org/10.24160/0013-5380-2021-4-25-33.

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Electrical machines are important parts of different power systems. The application of high temperature superconductors (HTS) in electrical machines is very promising due to high transport currents. This paper reviews various topologies of superconducting motors and generators using HTS published in the literature in recent time. It begins with a brief presentation of the HTS material used in electrical machines. The description of AC losses and cryogenic systems is done afterwards. Then we offer a striking description of the various realizations of HTS electrical machines such as half HTS synchronous machines, fully HTS synchronous machine, machines with HTS bulks and stacks. Some of these machines are totally innovative compared to conventional ones and their operating principle is strictly related to the presence of HTS materials.

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10

Ivanov, N. S., S. V. Zhuravlev, V. A. Kaderov, N. A. Malevich, and Bruno Duine. "Electrical machines with HTS windings – prospective schemes, design algorithm, and specific power dependences." Superconductivity: Fundamental and Applied Research, no. 1 (December 2023): 56–64. http://dx.doi.org/10.62539/2949-5644-2023-0-1-56-64.

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The parameters calculation results for electric machines with HTS armature windings have been provided in this Article. Various machine schemes using HTS field winding, permanent magnets, tooth and annular armature windings have been considered. A design algorithm that takes into account system level requirements, analytical calculations, finite element modeling, as well as heat and mechanical calculation have been proposed. Specific power dependences for 77K and 20K machines have been found from the analytical method and optimization calculation based on it. It has been proved that the method developed allows finding specific power for various machines. Specific power dependences presented in this Article can be used for system level design.

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11

Hernández-Millán, Rafael, and Jesús Rafael Pacheco-Pimentel. "Recycling rotating electrical machines." Revista Facultad de Ingeniería Universidad de Antioquia, no. 83 (June 2017): 56. http://dx.doi.org/10.17533/udea.redin.n83a07.

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12

Schwarz, K. K. "Electrical Machines and Drives." Power Engineering Journal 6, no. 3 (1992): 138. http://dx.doi.org/10.1049/pe:19920029.

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13

Hughes, A. "Electrical Machines and Drives." IEE Review 37, no. 3 (1991): 116. http://dx.doi.org/10.1049/ir:19910055.

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Williamson, S. "Electrical Machines and Drives." IEE Review 38, no. 1 (1992): 32. http://dx.doi.org/10.1049/ir:19920015.

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15

Williamson, A. C. "Superconducting Rotating Electrical Machines." IEE Proceedings B Electric Power Applications 132, no. 5 (1985): 298. http://dx.doi.org/10.1049/ip-b.1985.0044.

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16

Ponick, Bernd. "Miniaturisation of electrical machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 30, no. 4 (July 12, 2011): 1139–47. http://dx.doi.org/10.1108/03321641111133082.

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17

Selema, Ahmed, Mohamed N. Ibrahim, and Peter Sergeant. "Electrical Machines Winding Technology: Latest Advancements for Transportation Electrification." Machines 10, no. 7 (July 12, 2022): 563. http://dx.doi.org/10.3390/machines10070563.

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The ever-increasing demand for higher-power dense electrical machines has resulted in different electrical, mechanical, and thermal stresses, which can eventually cause machine failure. For this reason, the management of stresses and losses must be thoughtfully investigated to have a highly reliable electrical machine. The literature agrees that winding losses are the dominant loss mechanism in many electrical machines. However, statements vary on how to mitigate these losses along with the aforementioned stresses. To avoid winding failure, a study of the various winding topologies would allow for a better consideration of the challenges and limitations in the performance of different electrical machines. To this aim, this paper introduces a comprehensive review for different winding topologies. Many reported cases in the literature are summarized and compared. Moreover, the utilization of additive manufacturing (AM) in the production of the machine windings is presented, showing a high level of maturity of this emerging technology. Finally, different challenges facing the design of machine windings are introduced including the AC high frequency losses, thermal management, mechanical and acoustic problems, insulation aging, automated production, and winding manufacturability.

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18

Ishizaki, Akira, and Yuugi Akiyama. "Advance and Diversification of Rotating Electrical Machines. Diversification of Rotating Electrical Machines." IEEJ Transactions on Industry Applications 115, no. 7 (1995): 838–42. http://dx.doi.org/10.1541/ieejias.115.838.

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19

Levchenko, Larysa, Nataliia Ausheva, Nataliia Karaieva, Valentyn Glyva, and Nataliia Burdeina. "MODELING OF THE EXTERNAL MAGNETIC FIELD OF ELECTRIC MACHINES." Advanced Information Systems 8, no. 1 (February 26, 2024): 24–30. http://dx.doi.org/10.20998/2522-9052.2024.1.03.

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Powerful electric machines – such as electric generators, electric motors generate a magnetic field of great tension. These fields negatively effect on personnel and can to violate the stability of electronic equipment. To determine safe areas for workers, laying communication cables and placing sensitive electronic equipment, it is advisable to model the propagation of magnetic fields of electrical machines. This will make it possible to rationalize the placing of electrical equipment at design stages. The most common high-power electrical machines are four-pole electrical machines with a dipole-quadrupole structure of the external magnetic field. The purpose of the research is a development of models of the propagation of the external magnetic field generated by alternating current electric machines. Results of the research: it is substantiated that to simulate the propagation of the magnetic field of electric machines, it is advisable to use the Gauss equation for the magnetic scalar potential. This will make it possible to take into account the required number of spatial harmonics of the magnetic field to ensure an acceptable calculation error. An electric machine is considered in a spherical approximation. Calculations were carried out in spherical coordinates. The distances were determined in relative radii of the electric machine - the ratio of the radius of the machine to the definition of field strength. The calculations were made for two planes of spherical coordinates and a three-dimensional image was obtained. As a result of the simulation, it is possible to determine the magnetic field strength of a four-pole electric machine at selected distances and directions around the electric machine with the required accuracy. It has been established that there are points of zero external magnetic field strength around electrical machines. Verification of the simulation results was carried out using the method of full-scale measurements of the magnetic field strength around a real four-pole machine. The measurement results showed acceptable agreement with the calculated data. Conclusions: the chosen approach and the results of modeling the propagation of the external magnetic field of electrical machines can be used to design the placement of electrical equipment, taking into account the requirements for electromagnetic safety and electromagnetic compatibility of technical equipment.

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Raja, Hadi Ashraf, Karolina Kudelina, Bilal Asad, Toomas Vaimann, Ants Kallaste, Anton Rassõlkin, and Huynh Van Khang. "Signal Spectrum-Based Machine Learning Approach for Fault Prediction and Maintenance of Electrical Machines." Energies 15, no. 24 (December 15, 2022): 9507. http://dx.doi.org/10.3390/en15249507.

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Industrial revolution 4.0 has enabled the advent of new technological advancements, including the introduction of information technology with physical devices. The implementation of information technology in industrial applications has helped streamline industrial processes and make them more cost-efficient. This combination of information technology and physical devices gave birth to smart devices, which opened up a new research area known as the Internet of Things (IoT). This has enabled researchers to help reduce downtime and maintenance costs by applying condition monitoring on electrical machines utilizing machine learning algorithms. Although the industry is trying to move from scheduled maintenance towards predictive maintenance, there is a significant lack of algorithms related to fault prediction of electrical machines. There is quite a lot of research going on in this area, but it is still underdeveloped and needs a lot more work. This paper presents a signal spectrum-based machine learning approach toward the fault prediction of electrical machines. The proposed method is a new approach to the predictive maintenance of electrical machines. This paper presents the details regarding the algorithm and then validates the accuracy against data collected from working electrical machines for both cases. A comparison is also presented at the end of multiple machine learning algorithms used for training based on this approach.

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Khan, Muhammad Amir, Bilal Asad, Karolina Kudelina, Toomas Vaimann, and Ants Kallaste. "The Bearing Faults Detection Methods for Electrical Machines—The State of the Art." Energies 16, no. 1 (December 27, 2022): 296. http://dx.doi.org/10.3390/en16010296.

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Electrical machines are prone to faults and failures and demand incessant monitoring for their confined and reliable operations. A failure in electrical machines may cause unexpected interruptions and require a timely inspection of abnormal conditions in rotating electric machines. This article aims to summarize an up-to-date overview of all types of bearing faults diagnostic techniques by subdividing them into different categories. Different fault detection and diagnosis (FDD) techniques are discussed briefly for prognosis of numerous bearing faults that frequently occur in rotating machines. Conventional approaches, statistical approaches, and artificial intelligence-based architectures such as machine learning and deep learning are discussed summarily for the diagnosis of bearing faults that frequently arise in revolving electrical machines. The most advanced trends for diagnoses of frequent bearing faults based on intelligence and novel applications are reviewed. Future research directions that are helpful to enhance the performance of conventional, statistical, and artificial intelligence (machine learning, deep learning) and novel approaches are well addressed and provide hints for future work.

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Müller, Samuel, David Maier, and Nejila Parspour. "Inductive Electrically Excited Synchronous Machine for Electrical Vehicles—Design, Optimization and Measurement." Energies 16, no. 4 (February 7, 2023): 1657. http://dx.doi.org/10.3390/en16041657.

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The demand for electric machines has been rising steadily for several years—mainly due to the move away from the combustion engine. Synchronous motors with rare earth permanent magnets are widely used due to their high power densities. These magnets are cost-intensive, cost-sensitive and often environmentally harmful. In addition to dispensing with permanent magnets, electrically excited synchronous machines offer the advantage of an adjustable excitation and, thus, a higher efficiency in the partial load range in field weakening operation. Field weakening operation is relevant for the application of vehicle traction drive. The challenge of this machine type is the need for an electrical power transfer system, usually achieved with slip rings. Slip rings wear out, generate dust and are limited in power density and maximum speed due to vibrations. This article addresses an electrically excited synchronous machine with a wireless power transfer onto the rotor. From the outset, the machine is designed with a wireless power transfer system for use in a medium-sized electric vehicle. As an example, the requirements are derived from the BMW’s i3. The wireless power transfer system is integrated into the hollow shaft of the rotor. Unused space is thus utilized. The overall system is optimized for high efficiency, especially for partial load at medium speed, with an operation point-depending optimization method. The results are compared with the reference permanent magnet excited machine. A prototype of the machine is built and measured on the test bench. The measured efficiency of the inductive electrically excited synchronous machine is up to 4% higher than that of the reference machine of the BMW i3.

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Biernat, Adam, and Włodzimierz Przyborowski. "Measuring system for comprehensive testing of electrical machines." Bulletin of the Military University of Technology 69, no. 1 (March 31, 2020): 35–56. http://dx.doi.org/10.5604/01.3001.0014.2791.

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The article presents a measuring system designed for a comprehensive experimental testing of various types of electric machines. These tests include measurements of electrical, electromagnetic, kinematic, as well as mechanical and thermal quantities. The basic measurements of electrical machines include currents and voltages in electrical circuits, including voltages on resistive and generally impedance elements of these circuits, and induced voltages. Depending on the machine class and type, the measured values are constant or change over time. Some magnitudes of electromagnetic transformations are measured in the area of machine construction. In addition, the parameters of the measured values of the type of signal discriminants (average, effective and maximum values) and their waveforms are presented. Due to the wide range of machine state parameters, i.e. its state variables - in different load states, the multiplicity of these signals and the need to know their different characteristics, it becomes necessary to use individually adopted signal processing subsystems, i.e. signal acquisition systems, in the measuring systems. It is now possible thanks to the development in the CAM (Computer Aided Measurement) programming, for example using the graphical programming language of the integrated LabVIEW system. The article also presents examples of subsystems for the acquisition of measurements of nonelectromagnetic signals like vibrational and acoustic ones generated in machines. Keywords: electric machines, measurements, measuring system

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Moreno, Yerai, Gaizka Almandoz, Aritz Egea, Patxi Madina, and Ana Julia Escalada. "Multi-Physics Tool for Electrical Machine Sizing." Energies 13, no. 7 (April 2, 2020): 1651. http://dx.doi.org/10.3390/en13071651.

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Society is turning to electrification to reduce air pollution, increasing electric machine demand. For industrial mass production, a detailed design of one machine is usually done first, then a design of similar machines, but different ratings are reached by geometry scaling. This design process may be highly time-consuming, so, in this paper, a new sizing method is proposed to reduce this time, maintaining accuracy. It is based on magnetic flux and thermal maps, both linked with an algorithm so that the sizing process of an electrical machine can be carried out in less than one minute. The magnetic flux maps are obtained by Finite Element Analysis (FEA) and the thermal maps are obtained by analytical models based on Lumped Parameter Circuits (LPC), applying a time-efficient procedure. The proposed methodology is validated in a real case study, sizing 10 different industrial machines. Then, the accuracy of the sizing tool is validated performing the experimental test over the 10 machines. A very good agreement is achieved between the experimental results and the performances calculated by the sizing tools, as the maximum error is around 5%.

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Dorget, Rémi, Quentin Nouailhetas, Alexandre Colle, Kévin Berger, Kimiaki Sudo, Sabrina Ayat, Jean Lévêque, et al. "Review on the Use of Superconducting Bulks for Magnetic Screening in Electrical Machines for Aircraft Applications." Materials 14, no. 11 (May 26, 2021): 2847. http://dx.doi.org/10.3390/ma14112847.

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High-Temperature Superconductors (HTS) considerably accelerate the development of superconducting machines for electrical engineering applications such as fully electrical aircraft. This present contribution is an overview of different superconducting materials that can be used as magnetic screens for the inductor of high specific power electrical machines. The impact of the material properties, such as the critical temperature (Tc) and the critical current density (Jc), on the machine performances is evaluated. In addition, the relevance to flux modulation machines of different HTS bulk synthesis methods are addressed.

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Mueller, M. A., and N. J. Baker. "Direct drive electrical power take-off for offshore marine energy converters." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 219, no. 3 (May 1, 2005): 223–34. http://dx.doi.org/10.1243/095765005x7574.

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This paper investigates the issues associated with converting the energy produced by marine renewable energy converters, namely wave and tidal stream devices, into electricity using direct drive electrical power take-off, without use of complex pneumatic, hydraulic or other mechanical linkages. In order to demonstrate the issues, two alternative topologies of linear electrical machines are investigated: the linear vernier hybrid permanent magnet machine and the air-cored tubular permanent magnet machine. The electrical characteristics of these machines are described and compared in the context of mechanical integration. Potential solutions to the issues of sealing, corrosion and lubrication are discussed taking into account the electrical properties of the two topologies.

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Sarap, Martin, Ants Kallaste, Payam Shams Ghahfarokhi, Hans Tiismus, and Toomas Vaimann. "Utilization of Additive Manufacturing in the Thermal Design of Electrical Machines: A Review." Machines 10, no. 4 (March 31, 2022): 251. http://dx.doi.org/10.3390/machines10040251.

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Additive manufacturing (AM) is a key technology for advancing many fields, including electrical machines. It offers unparalleled design freedom together with low material waste and fast prototyping, which is why it has become to focus of many researchers. For electrical machines, AM allows the production of designs with optimized mechanical, electromagnetic and thermal parameters. This paper attempts to give the reader an overview of the existing research and thermal solutions which have been realized with the use of AM. These include novel heat sink and heat exchanger designs, solutions for cooling the machine windings directly, and additively manufactured hollow windings. Some solutions such as heat pipes, which have been produced with AM but not used to cool electrical machines, are also discussed, as these are used in conventional designs and will certainly be used for additively manufactured electrical machines in the future.

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Micallef, Christopher. "Thermal Management in Electrical Machines." Energies 15, no. 4 (February 16, 2022): 1455. http://dx.doi.org/10.3390/en15041455.

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Apart from protecting electrical machines from temperature related failures, thermal management of electrical machines is employed in the design phase of electrical machines to achieve higher efficiencies and higher power densities [...]

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Yudo, Eko, and Husman Husman. "Analisa Keausan Elektroda Electrical Discharge Machining Menggunakan Metoda Response Surface Methodology." Manutech : Jurnal Teknologi Manufaktur 10, no. 02 (May 20, 2019): 15–22. http://dx.doi.org/10.33504/manutech.v10i02.63.

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The current electrical dish machine machining (EDM) machine in the field of manufacturing has developed along with conventional machines such as Lathes, Milling Machines, and Grinding Machines as the leading technology. EDM is known for its ability to make complex shapes on very hard metals. EDM machines are widely used in the manufacture of dies, cutting tools, and molds that cannot be done with the cutting process. Therefore the level of electrode wear in the EDM process must be as efficient as possible. The research was conducted to determine the exact EDM process parameter setting values. Variable parameters are current, on time, off time. To optimize the response of this study using the Response Surface Methodology (RSM) method. High electrode wear is obtained in testing with parameters used Ton (300 μs), Toff (15 μs) and Current (20 A), and the smallest wear value is obtained in the test with the parameters used Ton (100 μs), Toff (15 μs) and Current (10 A).

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Ivshin, Igor Vladimirovich, Andrey Michailovich Kopylov, and Alfred Robertovich Safin. "Numerical Modeling of Dynamic Processes of the Reciprocating Reversible Electrical Machine." Applied Mechanics and Materials 792 (September 2015): 134–42. http://dx.doi.org/10.4028/www.scientific.net/amm.792.134.

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Now rotational electrical machines are used mainly for the implementation a reciprocating motion of working mechanisms and also as the electric generators powered by internal combustion engines. It is achieved by means of the kinematic transfers complicating a design and reducing the drive efficiency. The use of linear reciprocating electric machines allows to eliminate these defects. It should be noted that the most effective ones are the cylindrical designs of reciprocating electric machines with permanent magnets, whose efficiency reaches 93 – 95%. However, the rarity and lack of a mass production of this machine type and special recommendations for their design causes the need of research, directed on search of optimum constructive decisions. The article describes the types of linear electrical machines and summarizes the results of numerical modeling of dynamic characteristics for the three versions of the reciprocating cylindrical machine with permanent magnets of 10 kW with the oscillation frequency of the translator 20 Hz and the length of operating cycle of 120 mm. The most effective design parameters of linear electric machine were determined on the basis of its specific characteristics and analysis of the EMF graphics shape, appearing on the stator windings in the generator mode.

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Szucs, Aron, Zlatko Kolondzovski, Jan Westerlund, and Juha Vahala. "Diamond enriched lamination and winding insulation for electrical machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1245–52. http://dx.doi.org/10.1108/compel-10-2018-0397.

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Purpose The thermal management of electrical insulations poses a challenge in electrical devices as electrical insulators are also thermal insulators. Diamond is the best solid electrical insulator and thermal conductor. This can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. The paper introduces these techniques and discusses its effect for the design of electrical machines and its potential consequences for electromagnetic analysis, for example, in multi-physics modelling. The diamond winding insulation is patent-pending, but the diamond enriched lamination insulation is published for the benefit of the scientific community. Design/methodology/approach The windings of electrical machines are insulated to avoid contact between the coil and other conductive components, for example, the stator core. The principle of using mica tape and resin impregnation has not changed for a century and is well established to produce main insulation on a complex conductor shape and size. These insulations have poor heat-conducting properties. Similarly, the insulation of laminated steel sheets comprising the stator and rotor restrict heat flow. Diamond-based insulation provides a new path. Increased thermal conductivity means reduced temperature rise and the reduced thermal time constants in multi-physics simulations and system analysis. Findings The largest benefit of a diamond-based core insulation is in electrical machines in which the losses are conducted axially to the coolant. These are machines with radial ducts and effective cooling in the end regions. The main benefit will be in reducing the number of radial ducts that positively affect the size, production costs and the copper losses of the machine. The increased thermal conductivity of the diamond insulation system will reduce the thermal constants noticeably. These will affect system behavior and the corresponding simulation methods. Originality/value Diamond insulation can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. It might also lead to new modeling requirements in system analysis.

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Frosini, Lucia. "Novel Diagnostic Techniques for Rotating Electrical Machines—A Review." Energies 13, no. 19 (September 27, 2020): 5066. http://dx.doi.org/10.3390/en13195066.

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This paper aims to update the review of diagnostic techniques for rotating electrical machines of different type and size. Each of the main sections of the paper is focused on a specific component of the machine (stator and rotor windings, magnets, bearings, airgap, load and auxiliaries, stator and rotor laminated core) and divided into subsections when the characteristics of the component are different according to the type or size of the machine. The review considers both the techniques currently applied on field for the diagnostics of the electrical machines and the novel methodologies recently proposed by the researchers in the literature.

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Laksar, Jan, Radek Cermak, and Karel Hruska. "Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters." Energies 14, no. 21 (November 4, 2021): 7335. http://dx.doi.org/10.3390/en14217335.

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The usage of multiphase electrical drives expands the operation possibilities of electrical machines and opens new directions of research on inverter-fed electrical machines. With an increasing number of phases, the standard approach of the electromagnetic design of machines has to be generalized to m-phase systems, which is not usually respected in the literature focused on electric machine design, and it is rarely published. This paper summarizes the specific problems linked with the design of machines with different numbers of phases, focusing on the winding design and the calculation of equivalent circuit parameters. In addition to the direct effect of different numbers of phases, the impact of injecting higher order time harmonic components on the electromagnetic design of electric machines is analyzed. The obtained analytical results are verified by the measurement of a nine-phase experimental induction motor.

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Tawfiq, Kotb, Mehmet Güleç, and Peter Sergeant. "Bearing Current and Shaft Voltage in Electrical Machines: A Comprehensive Research Review." Machines 11, no. 5 (May 12, 2023): 550. http://dx.doi.org/10.3390/machines11050550.

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The reliability assessment of electric machines plays a very critical role in today’s engineering world. The reliability assessment requires a good understanding of electric motors and their root causes. Electric machines mostly fail due to mechanical problems and bearing damage is the main source of this. The bearings can be damaged by mechanical, electrical, and thermal stresses. Among all stresses, the researcher should give special attention to the electrical one, which is bearing current and shaft voltage. This review paper introduces a comprehensive study of bearing current and shaft voltage for inverter-fed electric machines. This study aims to discuss several motor failure processes, as well as the sources and definitions of bearing current and shaft voltage. The different kinds of bearing currents are addressed and the parasitic capacitances, which are the key component to describe bearing current, are determined. Several measurement approaches of bearing current will be discussed. Furthermore, modeling of bearing current will be covered together with the machine’s parasitic capacitances. Moreover, the different bearing current mitigation techniques, as described in many papers, will be thoroughly addressed. The use of rewound multiphase machines for mitigation of bearing current will be proposed and compared to a three-phase machine. Finally, various pulse width modulation techniques of multiphase systems that reduce bearing current and shaft voltage will be investigated, and the findings described in the literature will be summarized for all techniques.

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Rodger, David. "Modeling Movement in Electrical Machines." IEEE Transactions on Magnetics 57, no. 6 (June 2021): 1–4. http://dx.doi.org/10.1109/tmag.2021.3067469.

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Petrov, Ilya, Pavel Ponomarev, and Juha Pyrhönen. "Asymmetrical Geometries in Electrical Machines." International Review of Electrical Engineering (IREE) 11, no. 1 (February 29, 2016): 20. http://dx.doi.org/10.15866/iree.v11i1.7739.

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Chalmers, B. J. "100 Years of Electrical Machines." International Journal of Electrical Engineering Education 36, no. 4 (October 1999): 355–64. http://dx.doi.org/10.7227/ijeee.36.4.9.

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Schwarz, K. K. "Conference report. Electrical rotating machines." Power Engineering Journal 6, no. 4 (1992): 168. http://dx.doi.org/10.1049/pe:19920034.

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Merrill, E. F. "Dynamics of AC electrical machines." IEEE Transactions on Industry Applications 30, no. 2 (1994): 277–85. http://dx.doi.org/10.1109/28.287533.

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Kost, A. "ELECTROMAGNETIC ASPECTS OF ELECTRICAL MACHINES." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 14, no. 4 (April 1995): 1–20. http://dx.doi.org/10.1108/eb051905.

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Donaghy-Spargo, C. "Rotating electrical machines: Poynting flow." European Journal of Physics 38, no. 5 (August 15, 2017): 055204. http://dx.doi.org/10.1088/1361-6404/aa7dcc.

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Levi, Enrico, and Zivan Zabar. "Basic Design of Electrical Machines." IEEE Power Engineering Review PER-5, no. 6 (June 1985): 60–61. http://dx.doi.org/10.1109/mper.1985.5526658.

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Kettunen, Lauri, Stefan Kurz, Timo Tarhasaari, Ville Raisanen, Antti Stenvall, and Saku Suuriniemi. "Modeling Rotation in Electrical Machines." IEEE Transactions on Magnetics 50, no. 4 (April 2014): 1–10. http://dx.doi.org/10.1109/tmag.2013.2290101.

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Braun, Horst, and Hans-Joachim Lutz. "Fan impeller for electrical machines." Journal of the Acoustical Society of America 124, no. 3 (2008): 1393. http://dx.doi.org/10.1121/1.2986186.

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EL-Refaie, Ayman M. "Electrical machines for harsh environments." Journal of Engineering 2019, no. 17 (June 1, 2019): 3489–93. http://dx.doi.org/10.1049/joe.2018.8181.

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Eastham, J. F. "Editorial: Electrical machines and drives." IEE Proceedings - Electric Power Applications 143, no. 6 (1996): 409. http://dx.doi.org/10.1049/ip-epa:19960932.

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Williamson, S. "Editorial: Electrical machines and drives." IEE Proceedings - Electric Power Applications 145, no. 5 (1998): 401. http://dx.doi.org/10.1049/ip-epa:19982160.

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Levi, Enrico, and Zivan Zabar. "Basic Design of Electrical Machines." IEEE Transactions on Power Apparatus and Systems PAS-104, no. 6 (June 1985): 1513–18. http://dx.doi.org/10.1109/tpas.1985.319167.

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Farschtschi, A. "Temperature calculation in electrical machines." European Transactions on Electrical Power 2, no. 3 (September 6, 2007): 153–59. http://dx.doi.org/10.1002/etep.4450020304.

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Naseer, Muhammad Usman, Ants Kallaste, Bilal Asad, Toomas Vaimann, and Anton Rassõlkin. "A Review on Additive Manufacturing Possibilities for Electrical Machines." Energies 14, no. 7 (March 31, 2021): 1940. http://dx.doi.org/10.3390/en14071940.

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This paper presents current research trends and prospects of utilizing additive manufacturing (AM) techniques to manufacture electrical machines. Modern-day machine applications require extraordinary performance parameters such as high power-density, integrated functionalities, improved thermal, mechanical & electromagnetic properties. AM offers a higher degree of design flexibility to achieve these performance parameters, which is impossible to realize through conventional manufacturing techniques. AM has a lot to offer in every aspect of machine fabrication, such that from size/weight reduction to the realization of complex geometric designs. However, some practical limitations of existing AM techniques restrict their utilization in large scale production industry. The introduction of three-dimensional asymmetry in machine design is an aspect that can be exploited most with the prevalent level of research in AM. In order to take one step further towards the enablement of large-scale production of AM-built electrical machines, this paper also discusses some machine types which can best utilize existing developments in the field of AM.

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