A Phenomenological Approach for Condition Monitoring of Magnetic Cores Based on the Hysteresis Phenomenon

Abstract

Hysteresis phenomenon is a distinctive approach to describe natural behaviour of the magnetic materials and magnetic cores. This paper 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 analysing the hysteresis loops.

Static hysteresis modeling for grain-oriented electrical steels based on the phenomenological concepts of energy loss mechanism

“…Examples of DHLs for GO electrical steels, typically at a high flux density and a low flux density are shown in Figs 2-a where the instantaneous function of the flux density changes its direction, and where . Accordingly, by magnetizing the material over a continuous range of flux density from zero up to the saturation level, two distinctive curves can be observed [28]. An example of DHLs of a typical GO steel at a frequency of 50 Hz and peak flux densities of 0.1 T to 1.7 T, and the corresponding and curves are shown in Fig 3 . Relative permeability of the material can be calculated by tracing the curve.…”

“…Due to the dynamics of the magnetization processes under time varying magnetic field explained by the TSM (3), DHL of the material may follow different shapes, which essentially depend on the material properties and magnetization regime. The instantaneous values of the magnetic field strength and flux density cannot come up to the peak values simultaneously; which is more pronounced at low inductions and high frequencies [27][28]. Examples of DHLs for GO electrical steels, typically at a high flux density and a low flux density are shown in Figs 2-a where the instantaneous function of the flux density changes its direction, and where .…”

An Enhanced Analysis of Inter-Laminar Faults in Magnetic Cores With Grain Oriented Electrical Steels for Fault Diagnosis and Condition Monitoring: Theoretical Background and Experimental Verification

“…An example of core failure at the T-joint of a three-phase distribution transformer is shown in Fig 1. Following decades of research and development, all aspects and concepts of ILFs and their consequences on the magnetic cores are fully understood for the design and operation engineers [8][9][10]. Therefore, to prevent irreversible failures and breakdowns of the device, it is widely acknowledged that fault diagnosis of magnetic cores should be conducted at an early stage.…”

Internal Characterization of Magnetic Cores, Comparison to Finite Element Simulations: A Route for Dimensioning and Condition Monitoring

“…Magnetic core condition monitoring (MCCM) has been proposed to improve performance and durability [15], [16]. MCCM consists of a real-time inspection of the magnetic circuit performances to detect defects and predict a decrease in electromagnetic converter efficiency.…”

“…MCCM consists of a real-time inspection of the magnetic circuit performances to detect defects and predict a decrease in electromagnetic converter efficiency. MCCM has been performed by controlling the input and output electrical signals [15]. This simple approach limits the magnetic core diagnostic to average quantities and renders it impossible to geo-localize eventual defects.…”