Zoltan Nemeth

57203019678

Publications - 10

Demagnetization Fault Detection and Fault-Tolerant Control for PMa-SynRM Drive Using EKF-Based Permanent Magnet Flux Linkage Estimator

Krisztian Horvath Zoltan Nemeth Tamás Horváth

Publication Name: 2025 19th International Conference on Electrical Machines Drives and Power Systems Elma 2025 Proceedings

Publication Date: 2025-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Demagnetization faults in permanent magnetassisted synchronous reluctance motors (PMa-SynRMs) can lead to deterioration in the control performance of the drives, if the implemented PM flux linkage parameter is different from the actual value. To increase the robustness against demagnetization faults, a novel fault-tolerant control method is developed for PMa-SynRM drives. In the proposed method, an extended Kalman filter is used for online estimation of the PM flux linkage, which is tuned adaptively in the control algorithm, including the maximum torque per ampere strategy. The effectiveness of the proposed demagnetization fault-tolerant control technique is demonstrated by numerical simulations.

Open Access: Yes

DOI: 10.1109/ELMA65795.2025.11083424

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

Linear Quadratic Robust Control of Synchronous Reluctance Motor †

Zoltan Nemeth Dávid Gábor Bányai

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

Synchronous reluctance motors (SynRMs) play a key role in modern vehicles as they do not require permanent magnets and sliding brushes, reducing maintenance requirements and increasing reliability. My research focused on the development of robust torque control for SynRM. In the simulations, I compared the linear quadratic (LQ) controller with the conventional proportional–integral (PI) controller. To apply the LQ control method, I converted the nonlinear motor model into a linear one. We expect the results of this research to show that the LQ controller provides faster and more robust performance than the PI controller. LQ control can provide faster response times and a more stable operation, which are particularly important under dynamic vehicle operating conditions. Although LQ control is more computationally intensive and takes longer to fine tune, the results show that it results in a better and more stable control system. Such benefits are significant in dynamic vehicle operating conditions where fast and reliable torque control is essential. Overall, it can be concluded that advanced control techniques such as LQ can contribute to increasing the efficiency and performance of synchronous reluctance motors in the automotive industry, thus contributing to the development of sustainable and reliable vehicles.

Open Access: Yes

DOI: 10.3390/engproc2024079003

Linear-Matrix-Inequality-Based Controller and Observer Design for Induction Machine

Miklós Kuczmann Zoltan Nemeth

Publication Name: Electronics Switzerland

Publication Date: 2022-12-01

Volume: 11

Issue: 23

Page Range: Unknown

Description:

The modeling and drive control of electric machines are still actively researched scientific topics. Most of the existing models contain parameters that have no physical content or cannot be measured at all. For this reason, the use of observers in modern drive control algorithms is necessary. The main goal of this paper is to present the mathematical formalism of a linear matrix inequality (LMI)-based controller-observer design for a tensor product (TP) transformation-based model, including its implementation in a simulation environment. Based solely upon simulation results, the designed observer can provide a stable and accurate state space variable, regardless of the highly nonlinear induction machine model.

Open Access: Yes

DOI: 10.3390/electronics11233894

Tensor product transformation-based modeling of an induction machine

Miklós Kuczmann Zoltan Nemeth

Publication Name: Asian Journal of Control

Publication Date: 2021-05-01

Volume: 23

Issue: 3

Page Range: 1280-1289

Description:

The paper demonstrates a tensor product (TP) model transformation-based framework for an induction machine (IM). The state space model of an IM is highly nonlinear, thus the Takagi–Sugeno (TS) fuzzy model-based quasi-linear parameter-varying (qLPV) representation can be a good alternative approach of machines modeling. The paper presents the basics of IM state space modeling, how the TP transformation can be applied in details. The control of IM is always a pivotal point; hence, options of feedback control are discussed. The main goal of this paper is to present the whole process of IM TP transformation-based modeling including a control system.

Open Access: Yes

DOI: 10.1002/asjc.2468

Tensor Product Transformation Based Robust Control of Induction Machine

Miklós Kuczmann Zoltan Nemeth

Publication Name: Gpmc 2020 2nd IEEE International Conference on Gridding and Polytope Based Modeling and Control Proceedings

Publication Date: 2020-11-19

Volume: Unknown

Issue: Unknown

Page Range: 39-44

Description:

The paper presents the tensor product based model of the highly nonlinear induction machine model. The independence of flux and speed state feedback control has been examined with integral action. Robustness of the designed controller has been investigated with applied load torque, additional measurement noise and parameter uncertainties.

Open Access: Yes

DOI: 10.1109/GPMC50267.2020.9333812

State space modeling theory of induction machines

Miklós Kuczmann Zoltan Nemeth

Publication Name: Pollack Periodica

Publication Date: 2020-04-01

Volume: 15

Issue: 1

Page Range: 124-135

Description:

The paper discusses the theoretical background of the state space modeling of induction machines. The main goal is to present the necessary equations of the induction machine and the topic of the state space modeling. Although the induction machine is a highly non-linear system, LPV/qLPV model can be formulated from these equations.

Open Access: Yes

DOI: 10.1556/606.2020.15.1.12

Tensor Product Transformation based Modelling of Induction Machine

Miklós Kuczmann Zoltan Nemeth

Publication Name: Gpmc 2019 1st IEEE International Conference on Gridding and Polytope Based Modeling and Control Proceedings

Publication Date: 2019-11-01

Volume: Unknown

Issue: Unknown

Page Range: 31-32

Description:

State-space modelling theory is still a current topic of electrical machines in drive control. Induction machines can be described by nonlinear model leading to linear parameter varying (LPV) state-space model. In order to solve the above-mentioned highly nonlinear problem, Tensor Product (TP) transformation has been chosen. Big advantage of TP modelling are the short simulation time in MATLAB and speed controller can be designed easily.

Open Access: Yes

DOI: 10.1109/GPMC48183.2019.9106955

Measuring and simulating magnetic characteristics using Epstein frame

Miklós Kuczmann Zoltan Nemeth

Publication Name: Pollack Periodica

Publication Date: 2018-08-01

Volume: 13

Issue: 2

Page Range: 15-26

Description:

The paper discusses the standard of the Epstein frame that has been used to measure magnetic characteristics of the core made of material M250-35A supplied by different frequencies between 1-400 Hz. The measuring program has been built in LabVIEW including a control, filter and data save section as well. COMSOL Multiphysics 4.3b has been chosen as simulation environment, in which the Jiles-Atherton hysteresis model has been implemented.

Open Access: Yes

DOI: 10.1556/606.2018.13.2.2

Analysis of epstein frame by finite element method

Miklós Kuczmann Zoltan Nemeth

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2019-01-01

Volume: 95

Issue: 6

Page Range: 23-26

Description:

An Epstein frame has been built, which is used to measure magnetic properties of different kind of cores. Sinusoidal voltage excitation has been used in a frequency range of 1-400Hz. The measurements have been performed by a computer-controlled measurement system. The building and the measurement process have been published before. The objective of this work is to compare the simulation results performed with the COMSOL Multiphysics build-in modules and some potential formulation. For this work the Jiles-Atherton model has been chosen to prescribe hysteresis phenomena. The model parameters can be obtained by using the measurement results. The frame has been modelled in 2D.

Open Access: Yes

DOI: 10.15199/48.2019.06.05