Hamed Hamzehbahmani | Cardiff University (original) (raw)

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Papers by Hamed Hamzehbahmani

IEEE Transactions on Instrumentation and Measurement

Hysteresis phenomenon is a distinctive approach to describe the natural behavior of the magnetic ... more Hysteresis phenomenon is a distinctive approach to describe the natural behavior of the magnetic materials and magnetic cores. This article proposes a phenomenological approach for core quality assessment and condition monitoring of magnetic cores with grain-oriented electrical steels. The developed technique is based on the hysteresis phenomenon and interpreting the most distinctive parameters of the measured dynamic hysteresis loops. In this study, artificial short circuits were introduced between the laminations of stacks of two, three, and four Epstein size strips of Fe–3 wt % Si grain-oriented steel. The results showed that condition monitoring of the magnetic cores can be effectively performed by measuring and analyzing the hysteresis loops.

IEEE Transactions on Magnetics

IET Electric Power Applications, Aug 1, 2016

Inter-laminar short circuit faults between the laminations of electrical machines, and other magn... more Inter-laminar short circuit faults between the laminations of electrical machines, and other magnetic devices, have been one of the major challenges for the suppliers and customers of electrical steels. Extra power losses caused by inter-laminar faults depend on many factors including the location of the fault points. In this work fundamental definitions and concepts of inter-laminar short circuit faults, effect of inter-laminar faults on configuration of the magnetic cores and FEM verification are presented. Experimental works were performed to study the effect of inter-laminar faults with different configurations on the total power loss to distinguish and locate the critical and destructive faults. In the relevant studies, artificial short circuits of different configurations were applied between laminations of packs of four Epstein size laminations of 3 % grain oriented silicon steel. Extra power losses caused by the inter-laminar faults were measured and the results were analysed.

IEEE Transactions on Instrumentation and Measurement, 2019

Hamzehbahmani, Hamed (2020) 'An experimental approach for condition monitoring of magnetic cores ... more Hamzehbahmani, Hamed (2020) 'An experimental approach for condition monitoring of magnetic cores with grain oriented electrical steels.', IEEE transactions on instrumentation and measurement., 69 (6). pp.

IET Science, Measurement & Technology

Inter-laminar faults (ILFs) have major impacts on the overall performance of the electrical machi... more Inter-laminar faults (ILFs) have major impacts on the overall performance of the electrical machines and power transformers, among which extra power loss and hence lower efficiency could be highlighted. This paper presents an in depth analysis on energy loss and energy loss components of stacks of Grain-Oriented (GO) electrical steels subjected to different kinds of ILFs, under sinusoidal and non-sinusoidal inductions. Practical methods are developed to monitor quality of the magnetic cores, based on the measured static and dynamic hysteresis loops (SHL and DHL). The experimental results showed that, ILFs have a significant impact on the dynamic performance and dynamic energy loss of the cores, while their impact on the hysteresis loss is negligible. Furthermore, they become more destructive under non-sinusoidal inductions, and hence condition monitoring of the magnetic cores is more important for these applications.

2015 50th International Universities Power Engineering Conference (UPEC), 2015

Inter-laminar short circuit faults between laminations of the magnetic cores increase core losses... more Inter-laminar short circuit faults between laminations of the magnetic cores increase core losses and could cause major damage to electrical machines. In this paper, first causes and consequences of inter-laminar faults in magnetic cores are presented. Different types of inter-laminar fault detection methods are then presented and discussed. In the relevant studies, advantages and disadvantages of each method is highlighted. Finally, experimental results of an electro-magnetic fault detection method based on Flux Injection Probe is presented.

IET Science, Measurement & Technology, 2015

This paper investigates the influence of a wide range of magnetising frequency and peak flux dens... more This paper investigates the influence of a wide range of magnetising frequency and peak flux density on the magnetic properties of the electrical steels. In the relevant studies some important factors and operational properties, e.g. skin effect, nonuniform flux density distribution, complex relative permeability and magnetisation characteristic of the material, which are often neglected in the literature, are highlighted. Analytical modelling and experimental works were performed for 3 % grain oriented silicon steel. In order to show the impact of peak flux density on the magnetic properties, two peak flux densities 1.3 T as a high permeability point and 1.7 T as a low permeability point were considered. The results highlighted that magnetising frequency and peak flux density are two determinant factors with significant effect on the magnetic properties of electrical steels.

IEEE Transactions on Instrumentation and Measurement

Hysteresis phenomenon is a distinctive approach to describe the natural behavior of the magnetic ... more Hysteresis phenomenon is a distinctive approach to describe the natural behavior of the magnetic materials and magnetic cores. This article proposes a phenomenological approach for core quality assessment and condition monitoring of magnetic cores with grain-oriented electrical steels. The developed technique is based on the hysteresis phenomenon and interpreting the most distinctive parameters of the measured dynamic hysteresis loops. In this study, artificial short circuits were introduced between the laminations of stacks of two, three, and four Epstein size strips of Fe–3 wt % Si grain-oriented steel. The results showed that condition monitoring of the magnetic cores can be effectively performed by measuring and analyzing the hysteresis loops.

IEEE Transactions on Magnetics

IET Electric Power Applications, Aug 1, 2016

Inter-laminar short circuit faults between the laminations of electrical machines, and other magn... more Inter-laminar short circuit faults between the laminations of electrical machines, and other magnetic devices, have been one of the major challenges for the suppliers and customers of electrical steels. Extra power losses caused by inter-laminar faults depend on many factors including the location of the fault points. In this work fundamental definitions and concepts of inter-laminar short circuit faults, effect of inter-laminar faults on configuration of the magnetic cores and FEM verification are presented. Experimental works were performed to study the effect of inter-laminar faults with different configurations on the total power loss to distinguish and locate the critical and destructive faults. In the relevant studies, artificial short circuits of different configurations were applied between laminations of packs of four Epstein size laminations of 3 % grain oriented silicon steel. Extra power losses caused by the inter-laminar faults were measured and the results were analysed.

IEEE Transactions on Instrumentation and Measurement, 2019

Hamzehbahmani, Hamed (2020) 'An experimental approach for condition monitoring of magnetic cores ... more Hamzehbahmani, Hamed (2020) 'An experimental approach for condition monitoring of magnetic cores with grain oriented electrical steels.', IEEE transactions on instrumentation and measurement., 69 (6). pp.

IET Science, Measurement & Technology

Inter-laminar faults (ILFs) have major impacts on the overall performance of the electrical machi... more Inter-laminar faults (ILFs) have major impacts on the overall performance of the electrical machines and power transformers, among which extra power loss and hence lower efficiency could be highlighted. This paper presents an in depth analysis on energy loss and energy loss components of stacks of Grain-Oriented (GO) electrical steels subjected to different kinds of ILFs, under sinusoidal and non-sinusoidal inductions. Practical methods are developed to monitor quality of the magnetic cores, based on the measured static and dynamic hysteresis loops (SHL and DHL). The experimental results showed that, ILFs have a significant impact on the dynamic performance and dynamic energy loss of the cores, while their impact on the hysteresis loss is negligible. Furthermore, they become more destructive under non-sinusoidal inductions, and hence condition monitoring of the magnetic cores is more important for these applications.

2015 50th International Universities Power Engineering Conference (UPEC), 2015

Inter-laminar short circuit faults between laminations of the magnetic cores increase core losses... more Inter-laminar short circuit faults between laminations of the magnetic cores increase core losses and could cause major damage to electrical machines. In this paper, first causes and consequences of inter-laminar faults in magnetic cores are presented. Different types of inter-laminar fault detection methods are then presented and discussed. In the relevant studies, advantages and disadvantages of each method is highlighted. Finally, experimental results of an electro-magnetic fault detection method based on Flux Injection Probe is presented.

IET Science, Measurement & Technology, 2015

This paper investigates the influence of a wide range of magnetising frequency and peak flux dens... more This paper investigates the influence of a wide range of magnetising frequency and peak flux density on the magnetic properties of the electrical steels. In the relevant studies some important factors and operational properties, e.g. skin effect, nonuniform flux density distribution, complex relative permeability and magnetisation characteristic of the material, which are often neglected in the literature, are highlighted. Analytical modelling and experimental works were performed for 3 % grain oriented silicon steel. In order to show the impact of peak flux density on the magnetic properties, two peak flux densities 1.3 T as a high permeability point and 1.7 T as a low permeability point were considered. The results highlighted that magnetising frequency and peak flux density are two determinant factors with significant effect on the magnetic properties of electrical steels.