Tamas Orosz

56414717400

Publications - 23

Robustness of a flux-intensifying permanent magnet-assisted synchronous reluctance machine focusing on shifted surface-inset ferrite magnets

Mihaly Katona Tamas Orosz

Publication Name: Computers and Structures

Publication Date: 2025-09-01

Volume: 316

Issue: Unknown

Page Range: Unknown

Description:

Flux-intensifying permanent magnet-assisted synchronous reluctance machines use relatively small amounts of non-rare earth permanent magnets, making them viable alternatives for remanufacturing older machines, aligning with EU directives and circular economy principles. The asymmetric rotor topology is particularly suited for micromobility applications, which benefit from shifting inset magnets, as reverse motoring is rarely required. However, this design could be more sensitive to manufacturing and positioning errors of the magnets. To investigate the effects of the uncertainties of the shifted surface inset magnets, first, an optimal topology is selected based on average torque, torque ripple, and cogging torque using the NSGA-II optimisation method. The effects of the magnet shifting and its robustness are analysed using the Taguchi and ANOVA methods, validated by Full Factorial calculations. Results indicate a 31.25 % reduction in permanent magnet volume without compromising torque output with magnet shifting. The machine's average and cogging torque remain within a 5 % robustness threshold for a ±0.06 mm discrete manufacturing tolerance. Torque ripple may exceed this limit up to 14.77 %. However, the likelihood of exceeding the threshold is only 12.10 %. The reduced magnet volume and maintained performance make this topology a promising option for remanufactured machines in micromobility applications, supporting circular economy goals.

Open Access: Yes

DOI: 10.1016/j.compstruc.2025.107845

Numerical modelling of a solenoid optimization problem with a superposition-based model order reduction method

Tamas Orosz Kristóf Levente Kiss

Publication Name: Computers and Structures

Publication Date: 2025-09-01

Volume: 316

Issue: Unknown

Page Range: Unknown

Description:

This work investigates the application of a Model Order Reduction technique based on the Cauer ladder network method to the air cored solenoid geometry of the number 35 benchmark problem from the Testing electromagnetic analysis methods series, approaching both source and discrete radius optimization tasks. A projection-based reduced-order model was developed to accelerate the optimization process, achieving an average computational speedup factor of 35 compared to full-order finite element simulations. For discrete radius optimization, the problem was reformulated as a source optimization, enabling effective model order reduction application. The multiport Cauer ladder network approach reduced to a superposition of magnetic fields due to the simplicity of the problem. The reduced order model preserved consistency with the full order model when a small enough element size was chosen in the finite element model during its creation process. The error of the proposed methodology is an order of magnitude lower than the lowest objective function values in the optima, therefore it is suitable for multi-objective optimization.

Open Access: Yes

DOI: 10.1016/j.compstruc.2025.107906

Development of Magnetic Hysteresis Loop Measurement System for Characterization of 3D-Printed Magnetic Cores

Tamas Orosz Miklos CSIZMADIA Tamás Horváth

Publication Name: Electronics Switzerland

Publication Date: 2025-06-01

Volume: 14

Issue: 11

Page Range: Unknown

Description:

Today, numerous advanced options exist for analyzing and measuring magnetic hysteresis loops and core loss across a broad spectrum of applications. Most of these systems are compact and ready to use, fulfilling the measurement and data processing requirements for laminated iron cores according to the standards. However, modeling newly developed materials with complex structures or the high-frequency behavior of iron cores, and the computation of dynamic hysteresis properties’ temperature dependence, are still challenging problems in the field. Moreover, these standardized measurement tools are relatively expensive, and most of them represent a black box that impedes research and further development. This paper presents the development of a cheap and accessible measurement system that is explicitly designed for recording the hysteresis properties of 3D-printed iron cores. The paper presents a comprehensive overview of the design process, components, circuitry, and simulations integral to this project. The paper presents a completed circuit simulation conducted using LTspice and validation of the prototype’s measurement performance. The measurements obtained with the proposed system show good agreement with those of the reference setup, demonstrating its accuracy and practical applicability.

Open Access: Yes

DOI: 10.3390/electronics14112235

Parameter Sensitivity Analysis and Rotor Topology Optimisation of a Synchronous Reluctance Machine

Mihaly Katona Tamas Orosz

Publication Name: Lecture Notes in Networks and Systems

Publication Date: 2025-01-01

Volume: 1258 LNNS

Issue: Unknown

Page Range: 14-23

Description:

As environmental policies tighten and consumers demand sustainable products, transitioning from a linear to a circular economy is crucial. A promising approach to circular economy is remanufacturing end-of-life electric machines to meet original or new specifications. Designing a rotor for remanufacturing with a different topology to fulfil the new requirements is a complex, non-linear optimisation task. In this paper, a permanent magnet-based synchronous machine is transformed into a synchronous reluctance machine with a new rotor topology. In this research, the Taguchi method is used to estimate parameter sensitivity. For optimisation, the Non-dominated Sorting Genetic Algorithm II was selected. Multi-criteria decision-making methods also helped choosing the optimal designs for maximum torque and minimal torque ripple. The sensitivity analysis revealed that the cut-off barrier shape significantly affects the average torque. In contrast, the height of the inner flux barrier had the most negligible effect. Most parameters showed almost the same magnitudes to torque ripple except for the height of the flux barrier, which again was the least significant. TOPSIS and SPOTIS methods using statisticalvariance and entropy weights showed some disagreements, indicating the complexity of selecting the optimal design.

Open Access: Yes

DOI: 10.1007/978-3-031-81799-1_2

Model Order Reduction Methods for Rotating Electrical Machines: A Review

Tamas Orosz Kristóf Levente Kiss

Publication Name: Energies

Publication Date: 2024-10-01

Volume: 17

Issue: 20

Page Range: Unknown

Description:

Due to the rise of e-mobility applications, there is an increased demand to create more accurate control methods, which can reduce the loss in an e-drive system. The accurate modeling of the rotating machines needs to resolve a partial differential equation system that describes the thermal and mechanical behavior of the different parts in addition to the electromagnetic design. Due to these models’ limited resources and high computation demand, they cannot be used directly for real-time control. Model order reduction methods have been of growing interest in the past decades and offer solutions for this problem. According to the processed literature, many model order reduction-based methods are used for a wide range of problems. However, a paper has not been published that discusses a model order reduction-based real-time control model that is actually used in the industry. This paper aims to summarize and systematically review the model order reduction methods developed for rotating electrical machines in the last two decades and examine the possible usage of these methods for a real-time control problem.

Open Access: Yes

DOI: 10.3390/en17205145

Numerical Modeling and Optimization of a Quasi-Resonant Inverter-Based Induction Heating Process of a Magnetic Gear

Tamas Orosz Balázs Nagy Miklos CSIZMADIA

Publication Name: Energies

Publication Date: 2024-08-01

Volume: 17

Issue: 16

Page Range: Unknown

Description:

Induction heating is a clear, cheap, and highly effective technology used for many industrial and commercial applications. Generally, a time-varying magnetic field produces the required heat in the workpiece with a specially designed coil. The efficiency of the heating process depends highly on the coil design and the geometrical arrangement. A detailed and accurate finite element analysis of the induction heating process usually needs to resolve a coupled thermoelastic–magnetic problem, whose parameters values depend on the solution of another field. The paper deals with a shrink-fitting process design problem: a gear should be assembled with an axe. The interesting part of this case study is given the prescribed low limits for critical stress, the temperature of the gear material, and the heat-treated wearing surfaces. A coupled finite-element-based model and a genetic algorithm-based parameter determination methodology were presented. A thermal imaging-based measurement validated the presented numerical model and parameter determination task. The results show that the proposed methodology can be used to calibrate and validate the numerical model and optimize an induction heating process.

Open Access: Yes

DOI: 10.3390/en17164130

Frequency- and Temperature-Dependent Uncertainties in Hysteresis Measurements of a 3D-Printed FeSi wt6.5% Material

Tamas Orosz B. Kocsis

Publication Name: Sensors

Publication Date: 2024-05-01

Volume: 24

Issue: 9

Page Range: Unknown

Description:

Additive manufacturing of soft magnetic materials is a promising technology for creating topologically optimized electrical machines. High-performance electrical machines can be made from high-silicon-content FeSi alloys. Fe-6.5wt%Si material has exceptional magnetic properties; however, manufacturing this steel with the classical cold rolling methodology is not possible due to the brittleness of this material. Laser powder bed fusion technology (L-PBF) offers a solution to this problem. Finding the optimal printing parameters is a challenging task. Nevertheless, it is crucial to resolve the brittleness of the created materials so they can be used in commercial applications. The temperature dependence of magnetic hysteresis properties of Fe-6.5wt%Si materials is presented in this paper. The magnetic hysteresis properties were examined from 20 °C to 120 °C. The hysteresis measurements were made by a precision current generator–based hysteresis measurement tool, which uses fast Fourier transformation–based filtering techniques to increase the accuracy of the measurements. The details of the applied scalar hysteresis sensor and the measurement uncertainties were discussed first in the paper; then, three characteristic points of the static hysteresis curve of the ten L-PBF-manufactured identical toroidal cores were investigated and compared at different temperatures. These measurements show that, despite the volumetric ratio of the porosities being below 0.5%, the mean crack length in the samples is not significant for the examined samples. These small defects can cause a significant 5% decrement in some characteristic values of the examined hysteresis curve.

Open Access: Yes

DOI: 10.3390/s24092738

Circular Economy Aspects of Permanent Magnet Synchronous Reluctance Machine Design for Electric Vehicle Applications: A Review

Mihaly Katona Tamas Orosz

Publication Name: Energies

Publication Date: 2024-03-01

Volume: 17

Issue: 6

Page Range: Unknown

Description:

Innovative technological solutions have become increasingly critical in addressing the transportation sector’s environmental impact. Passenger vehicles present an opportunity to introduce novel drivetrain solutions that can quickly penetrate the electric vehicle market due to their shorter development time and lifetime compared to commercial vehicles. As environmental policy pressure increases and customers demand more sustainable products, shifting from a linear business approach to a circular economy model is in prospect. The new generation of economically competitive machines must be designed with a restorative intention, considering future reuse, refurbishment, remanufacture, and recycling possibilities. This review investigates the market penetration possibilities of permanent magnet-assisted synchronous reluctance machines for mini and small-segment electric vehicles, considering the urban environment and sustainability aspects of the circular economy model. When making changes to the materials used in an electric machine, it is crucial to evaluate their potential impact on efficiency while keeping the environmental impact of those materials in mind. The indirect ecological effect of the vehicle’s use phase may outweigh the reduction in manufacturing and recycling at its end-of-life. Therefore, thoroughly analysing the materials used in the design process is necessary to ensure maximum efficiency while minimising the environmental impact.

Open Access: Yes

DOI: 10.3390/en17061408

Current Challenges in Operation, Performance, and Maintenance of Photovoltaic Panels

Anton Rassõlkin Ádám Sleisz Peter Poór Pedro Arsénio Tamas Orosz Daniil Valme

Publication Name: Energies

Publication Date: 2024-03-01

Volume: 17

Issue: 6

Page Range: Unknown

Description:

The installed solar capacity in the European Union has expanded rapidly in recent years. The production of these plants is stochastic and highly dependent on the weather. However, many factors should be considered together to estimate the expected output according to the weather forecast so that these new PV plants can operate at maximum capacity. Plants must be operated in coordination with maintenance operations and considering actual energy market prices. Various methods have recently been developed in the literature, ranging from the most impactful artificial-intelligence-based generation estimation methods to various diagnostic and maintenance methods. Moreover, the optimal operational and maintenance strategy usually depends on market regulation, and there are many concerns related to the distribution system operator. This review article aims to summarize and illustrate the challenges of operating and maintaining solar power plants and the economic and technical importance of these problems.

Open Access: Yes

DOI: 10.3390/en17061306

Remanufacturing a Synchronous Reluctance Machine with Aluminum Winding: An Open Benchmark Problem for FEM Analysis

Miklós Kuczmann Mihaly Katona Tamas Orosz Zoltan Nemeth Dávid Gábor Bányai

Publication Name: Electronics Switzerland

Publication Date: 2024-02-01

Volume: 13

Issue: 4

Page Range: Unknown

Description:

The European Union’s increasing focus on sustainable and eco-friendly product design has resulted in significant pressure on original equipment manufacturers to adopt more environmentally conscious practices. As a result, the remanufacturing of end-of-life electric machines is expected to become a promising industrial segment. Identifying the missing parameters of these types of machines will play an essential role in creating feasible and reliable redesigns and remanufacturing processes. A few case studies related to this problem have been published in the literature; however, some novel, openly accessible benchmark problems can facilitate the research and function as a basis for comparing and validating novel numerical methods. This paper presents the identification process of an experimental synchronous machine. It outlines methodologies for identifying material properties, winding schemes, and other critical parameters for the finite element analysis and modelling of electric machines with incomplete information. The machine in question is intended for remanufacturing, with the plan to replace its faulty winding with an aluminium-based alternative. It also serves as an open benchmark problem for researchers, designers, and practitioners.

Open Access: Yes

DOI: 10.3390/electronics13040727

Accuracy of the robust design analysis for the flux barrier modelling of an interior permanent magnet synchronous motor

Miklós Kuczmann Mihaly Katona Tamas Orosz

Publication Name: Journal of Computational and Applied Mathematics

Publication Date: 2023-09-01

Volume: 429

Issue: Unknown

Page Range: Unknown

Description:

Mass-produced electrical machines are subjected to manufacturing uncertainties in terms of geometry. A robust design is inevitable to ensure the consistent performance of the electric motor. Some parts of the rotor geometry are often simplified, like the flux barrier at the end of the magnets. This paper presents a design optimisation regarding the torque ripple and the average torque. The aim is to assess the effects of the flux barrier on the main properties of a permanent magnet synchronous motor. Also, robust design analysis is presented on the flux barrier. The computational burden of the robust design analysis is immense, even if uniform uncertainties are assumed. In this case, different Design of Experiment (DoE) methods reduce the number of simulations. The efficiency of the DoE methods is compared in terms of simulation number and extreme value approximation. We found that the Central Composite method is the most accurate, while the Plackett–Burman is the most efficient in this particular case.

Open Access: Yes

DOI: 10.1016/j.cam.2023.115228

Iron Loss Calculation Methods for Numerical Analysis of 3D-Printed Rotating Machines: A Review

Miklós Kuczmann Tamas Orosz Balázs Tóth B. Kocsis Tamás Horváth

Publication Name: Energies

Publication Date: 2023-09-01

Volume: 16

Issue: 18

Page Range: Unknown

Description:

Three-dimensional printing is a promising technology that offers increased freedom to create topologically optimised electrical machine designs with a much smaller layer thickness achievable with the current, laminated steel-sheet-based technology. These composite materials have promising magnetic behaviour, which can be competitive with the current magnetic materials. Accurately calculating the iron losses is challenging due to magnetic steels’ highly nonlinear hysteretic behaviour. Many numerical methodologies have been developed and applied in FEM-based simulations from the first introduced Steinmetz formulae. However, these old curve-fitting-based iron loss models are still actively used in modern finite-element solvers due to their simplicity and high computational demand for more-accurate mathematical methods, such as Preisach- or Jiles–Atherton-model-based calculations. In the case of 3D-printed electrical machines, where the printed material can have a strongly anisotropic behaviour and it is hard to define a standardised measurement, the applicability of the curve-fitting-based iron loss methodologies is limited. The following paper proposes an overview of the current problems and solutions for iron loss calculation and measurement methodologies and discusses their applicability in designing and optimising 3D-printed electrical machines.

Open Access: Yes

DOI: 10.3390/en16186547

Performance analysis of a robust design optimization of a solenoid with different sensitivity metrics

Miklós Kuczmann David Pánek Tamas Orosz

Publication Name: Journal of Computational and Applied Mathematics

Publication Date: 2023-05-01

Volume: 424

Issue: Unknown

Page Range: Unknown

Description:

Optimization is an essential part of designing electrical machines and devices. Considering the uncertainties and tolerances from the beginning of the design process can lead to a more robust design and significantly reduce the number of waste products during the manufacturing process. However, the computational demand for these robust design optimization problems is amazingly high. This paper examines how the computational demand and the robustness of the results depend on the applied sensitivity metric. The multi-objective TEAM 35 benchmark problem has been used as the basis of the comparison. This optimization task aims to create a homogeneous magnetic field in a predefined coil region, which is insensitive to the positioning errors of the coil turns. The original definition of the problem uses a simple worst-case sensitivity metric calculated from the extreme values of the optimized turn parameters in the given tolerance range. This sensitivity metric has been replaced by Plackett–Burman, Box–Behnken, and Central Composite Design-based metrics. It was shown in this simple geometry that there is a significant difference between the resulting sensitivities. Nevertheless, Plackett–Burman and Central Composite Design provided the more accurate and consistent estimate of the sensitivity of the examined layouts, with a higher but still reasonable computation demand than the worst-case metric.

Open Access: Yes

DOI: 10.1016/j.cam.2022.115021

Temperature-Dependent Ferromagnetic Loss Approximation of an Induction Machine Stator Core Material Based on Laboratory Test Measurements

Miklós Kuczmann Tamas Orosz

Publication Name: Energies

Publication Date: 2023-02-01

Volume: 16

Issue: 3

Page Range: Unknown

Description:

The accurate measurement and modeling of ferromagnetic material losses are vital issues during the design and analysis of electrical machines. Higher loss values can describe the manufactured rotor and stator machine plates better than the catalog data obtained by standardized measurements using the Epstein frame. In this paper, different temperature-dependent models based on the loss-separation principle are introduced and compared with the measurements. The model parameters are computed from customized laboratory and standardized measurements. The customized measurements based on the stator part of an induction machine in the range of the automotive industry standard, i.e., in [−40 (Formula presented.) C, ⋯, 180 (Formula presented.) C]. The proposed model and measurement process can be used in the post-processing stage of numerical field analysis to obtain electromagnetic losses according to the agreement between measured and simulated results. During a numerically expensive optimization process, this model can be used to consider the temperature dependence of the losses more accurately. The study shows that more than 50% of loss increase can be measured, compared with the catalog data, if we use the manufactured, stator-based, customized measurements based on the estimation of the iron loss parameters.

Open Access: Yes

DOI: 10.3390/en16031116

A Novel Control Scheme Based on Exact Feedback Linearization Achieving Robust Constant Voltage for Boost Converter

Miklós Kuczmann Tamas Orosz Miklos CSIZMADIA

Publication Name: Electronics Switzerland

Publication Date: 2023-01-01

Volume: 12

Issue: 1

Page Range: Unknown

Description:

This paper presents a novel form of feedback linearization control (FBL) of boost-type DC/DC converter: to reach highly accurate output voltage control. Integral action has been inserted into the block diagram of the control scheme. The state-space model of the boost converter is highly nonlinear. Accordingly, the design procedure of the controller is more complex. The paper presents the state-space modeling of the boost converter and details the design procedure of the nonlinear FBL controller step by step. The main goal of this paper is to highlight the importance of the error integrator in the FBL control loop. The proposed method has been tested by a numerical example and compared with an existing and validated two-loop controller. Both the dynamical and steady-state behavior of the examined boost converter performed better than the reference system. The steady-state error of the output voltage is almost eliminated, while the dynamical error decreased to 5% in comparison to the two-loop controller.

Open Access: Yes

DOI: 10.3390/electronics12010057

Cogging Torque Analysis of Toyota Prius 2004 IPMSM Motor with the Digital-Twin-Distiller

Mihaly Katona Péter Kiss Tamas Orosz Krisztián Gadó

Publication Name: Lecture Notes in Mechanical Engineering

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 126-138

Description:

With the recent advancements of the fourth industrial revolution, many sensors are implemented into the products that collect the data and monitor their performance. The measurement data can be stored with the numerical models as a digital twin, and these can serve as a virtual replica of a physical object or process. These digital twins can improve the design and optimization process. The paper uses an open-source tool, the Digital-Twin-Distiller, which can encapsulate the realized finite element analysis of a model into a web application, which can be integrated easily into an optimization chain or any other business process. The paper proposes a numerical model and cogging torque analysis of an interior permanent magnet synchronous machine. The paper examines the effect of two parameters of the magnet groove shape on the cogging torque of the Prius 2004 motor model. It was found that the cogging torque of the motor is highly dependent on the shape of the flux barrier, even with minor changes. On the other hand, the wedge between the two magnets does not affect cogging torque much.

Open Access: Yes

DOI: 10.1007/978-3-031-15211-5_11

FEM-Based Power Transformer Model for Superconducting and Conventional Power Transformer Optimization

Tamas Orosz

Publication Name: Energies

Publication Date: 2022-09-01

Volume: 15

Issue: 17

Page Range: Unknown

Description:

There were many promising superconducting materials discovered in the last decades that can significantly increase the efficiency of large power transformers. However, these large machines are generally custom-made and tailored to the given application. During the design process the most economical design should be selected from thousands of applicable solutions in a short design period. Due to the nonlinearity of the task, the cost-optimal transformer design, which has the smallest costs during the transformers’ planned lifetime, is usually not the design with the highest efficiency. Due to the topic’s importance, many simplified transformer models were published in the literature to resolve this problem. However, only a few papers considered this preliminary design optimization problem in the case of superconducting transformers and none of them made a comparison with a validated conventional transformer optimization model. This paper proposes a novel FEM-based two-winding transformer model, which can be used to calculate the main dimension of conventional and superconducting transformer designs. The models are stored in a unified JSON-file format, which can be easily integrated into an evolutionary or genetic algorithm-based optimization. The paper shows the used methods and their accuracy on conventional 10 MVA and superconducting 1.2 MVA transformer designs. Moreover, a simple cost optimization with the 10 MVA transformer was performed for two realistic economic scenarios. The results show that in some cases the cheaper, but less efficient, transformer can be the more economic.

Open Access: Yes

DOI: 10.3390/en15176177

Robust Design Optimization of Electrical Machines and Devices

Miklós Kuczmann David Pánek Anton Rassõlkin Tamas Orosz

Publication Name: Electronics Switzerland

Publication Date: 2022-05-01

Volume: 11

Issue: 9

Page Range: Unknown

Description:

No description provided

Open Access: Yes

DOI: 10.3390/electronics11091427

Performance Comparison of Quantized Control Synthesis Methods of Antenna Arrays

David Pánek Tamas Orosz Hamid Keshmiri Neghab Deubauh Cedrick D. Gnawa Pavel Karban

Publication Name: Electronics Switzerland

Publication Date: 2022-04-01

Volume: 11

Issue: 7

Page Range: Unknown

Description:

There is a great potential in small satellite technology for testing new sensors, processes, and technologies for space applications. Antennas need careful design when developing a small satellite to establish stable communication between the ground station and the satellite. This work is motivated by the design of an antenna array for a future rotatorless base station for the VZLUSAT group of Czech nano-satellites. The realized antenna array must cover a relatively broad range of elevation and azimuth angles, and the control must be fast enough to track the satellite in low Earth orbits. The paper deals with possibilities of synthesis of quantized control of the antenna array. It compares quantization influence for well-known deterministic synthesis methods. It shows the method for decreasing computational cost of synthesis using optimization approach and presents the multi-criteria optimization as a tool for reaching required radiation pattern shape and low sensitivity to quantization at the same time.

Open Access: Yes

DOI: 10.3390/electronics11070994

Locked-rotor analysis of a Prius 2004 IPMSM motor with Digital-Twin-Distiller

Mihaly Katona Tamas Orosz

Publication Name: 2022 IEEE 20th International Power Electronics and Motion Control Conference Pemc 2022

Publication Date: 2022-01-01

Volume: Unknown

Issue: Unknown

Page Range: 201-208

Description:

In this paper, an open-source tool, the Digital-Twin-Distiller, is used, which can encapsulate the realized FEM model into a web application as a digital twin. Many papers have proposed the cogging torque and the locked-rotor FEM calculations of the Toyota Prius 2004 motor. However, these models have minor differences, mainly in rotor topology. This paper presents a fully defined motor model and the effect of the flux barrier shape on the locked-rotor simulations. The results show that minor structural changes in the flux barrier's shape in the manufacturing tolerance range significantly affect the calculated torque.

Open Access: Yes

DOI: 10.1109/PEMC51159.2022.9962847

FEM-based benchmark problem for cogging torque minimization of axial flux permanent-magnet motors in Artap framework

Tamas Orosz Attila Nyitrai

Publication Name: Periodica Polytechnica Electrical Engineering and Computer Science

Publication Date: 2021-04-27

Volume: 65

Issue: 2

Page Range: 152-159

Description:

Optimization of axial flux permanent-magnet motors is a very important topic in the literature and requires high performance optimization algorithms and finite element analysis. This paper gives a summary of the analysis methods of axial flux permanent-magnet motors currently available in the literature. An open-circuit model was built and described using the 2D Linear Motor Modeling Approach. The model was validated by comparing air-gap flux-density waveform and cogging torque results with one of the motors described in the literature as a benchmark problem. The aim of the study was to create a method for the axial-flux motor optimization based on the open-circuit finite element model using the Artap software. By applying the described method, it is possible to use local and global optimization algorithms, such as evolutionary and genetic algorithms, directly using the finite element analysis results. The proposed finite element model can be used for benchmarking and selecting the most appropriate evolutionary and genetic algorithms for this kind of optimization problems.

Open Access: Yes

DOI: 10.3311/PPee.17755

Surrogate Model-based Optimization of Electrical Machines in Ārtap Framework

Miklós Kuczmann Tamas Orosz Attila Nyitrai

Publication Name: Proceedings 2021 IEEE 19th International Power Electronics and Motion Control Conference Pemc 2021

Publication Date: 2021-04-25

Volume: Unknown

Issue: Unknown

Page Range: 514-518

Description:

For accurate modeling of electrical machines the solution multiple physical fields simultaneously in 3D is necessary. Therefore, the optimization of these machines is an computationally expensive optimization problem. The novel artificial intelligence methods and surrogate modeling techniques based on hp-adaptive FEM techniques can significantly reduce the computational cost. In case of a cogging torque or a torque ripple calculation, many simulations should be performed to make an accurate estimation of a single quantity. The number of calculations can be reduced by using surrogate modeling techniques. However, the surrogate model-based model's extrema can differ from the original task's optima. This paper presents a surrogate-model based cogging torque minimization of an axial flux permanent magnet synchronous machine. The objective function of this optimization is the cogging torque, the full solution space is explored to examine and show the robustness of the different kind of solutions.

Open Access: Yes

DOI: 10.1109/PEMC48073.2021.9432546

Identification for Remanufacturing of a Synchronous Reluctance Machine Considering the Circular Economy Conditions

Miklós Kuczmann Mihaly Katona Tamas Orosz

Publication Name: Chemical Engineering Transactions

Publication Date: 2023-01-01

Volume: 107

Issue: Unknown

Page Range: 469-474

Description:

Due to the growing pressure from governmental entities and customers in the European Union, Original Equipment Manufacturers are being pushed to design and manufacture sustainable and environmentally friendly products. A profitable industrial segment is expected to emerge from recycling end-of-life electric machines. This paper aims to identify an experimental synchronous reluctance machine with faulty copper windings to remanufacture the machine. The rewound design aims to achieve similar or improved characteristics and fit the novel requirements of the circular economy. The recyclability of the machine can be significantly increased by changing the copper windings to aluminum-based hairpin windings. The paper shows the geometrical, material, and winding identification plus finite element method-based analysis of the initial machine. The electric machine’s slot-filling factor can be improved using an appropriate aluminum-based hairpin winding design compared to the original, even in the case of standard slots where the sides of the slots are not parallel.

Open Access: Yes

DOI: 10.3303/CET23107079