• A single-sheet tester to measure electrical steel loss under uniaxial magnetisation. Transverse magnetisation is shown occur in grain-oriented silicon steel. Losses due transverse fields are not detected conventional test methods. losses depend on grain size and mis- orientation oriented normally of practical importance machine cores. modified rotational tester, which a circular sample can be...

A finite element microstructure model with permeability tensors that considers crystallographic texture and grain size based on magnetic domain theory has been developed for the evaluation of anisotropy in polycrystalline steels. The proved capable capturing texture, vector induction effects effective behaviours typical textures predicted properties as a function field direction enables quantit...

Linear Polarisation Resistance (LPR) can provide a direct evaluation of the instantaneous rate of corrosion. However it has the disadvantage of requiring a localised breakout of the concrete cover to provide an electrical connection to the steel reinforcement. This paper describes an adaptation of the LPR method and the four-point Wenner resistivity method to give an evaluation of the rate of s...

This paper is concerned about the parameters identification of the Jiles-Atherton hysteresis loop model using Fruit Fly Optimization Algorithm (FOA). An improved Fruit Fly optimization algorithm (IFOA) is proposed to overcome the drawback of FOA, such as easily falling into local optimum, low precision, and poor stability. The IFOA has been applied to identify Jiles-Atherton model parameters of...

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The performance and degree of efficiency of transformers are directly determined by the bulk magnetic properties of grain oriented electrical steel laminations. The core losses can be improved by post manufacturing methods, so-called domain refinement techniques. All these methods induce mechanical or thermal stress that refines the domain structure. The most commonly used technique is laser sc...

Imaging magnetic domains for soft magnetic materials using scanning electron microscopy (SEM) typically requires a specially modified setup. These modifications can include higher beam acceleration voltages, modifications of the sample and detector geometry, and/or specialized detectors to detect the spin polarization of secondary electrons [1,2]. In this research, a method is presented for ima...

Hysteresis phenomenon is a distinctive approach to describe the natural behavior of magnetic materials and cores. This article proposes phenomenological for core quality assessment condition monitoring cores with grain-oriented electrical steels. The developed technique based on hysteresis interpreting most parameters measured dynamic loops. In this study, artificial short circuits were introdu...

Hysteresis loops constitute the source of important information for designers magnetic circuits in power transformers. The paper focused on possibility to interpret phenomenological T(x) model terms effective field vs. magnetization dependence. interdependence anhysteretic curve and hysteresis was emphasized. concept plane introduced at end last century by Sablik Langman subject a tangible inte...

This paper presents an artificial neural network (ANN) approach to predicting and classifying distribution transformer specific iron losses, i.e., losses per weight unit. The ANN is trained to learn the relationship of several parameters affecting iron losses. For this reason, the ANN learning and testing sets are formed using actual industrial measurements, obtained from previous completed tra...