Stray-field loss and flux distribution inside magnetic steel plate under harmonic excitation

Abstract

Purpose This paper aims to investigate an efficient approach to model the electromagnetic behaviors and predict stray-field loss inside the magnetic steel plate under 3D harmonic magnetization conditions so as to effectively prevent the structural components from local overheating and insulation damage in electromagnetic devices. Design/methodology/approach An experimental setup is applied to measure all the magnetic properties of magnetic steel plate under harmonic excitations with different frequencies and phase angles. The measurement and numerical simulation are carried out based on the updated TEAM Problem 21 Model B+ (P210-B+), under the 3D harmonic magnetization conditions. An improved method to evaluate the stray-field loss is proposed, and harmonic flux distribution in the structural components is analyzed. Findings The influence of the harmonic order and phase angle on the stray-field loss in magnetic steel components are noteworthy. Based on the engineering-oriented benchmark models, the variations of stray-field losses and magnetic field distribution inside the magnetic components under harmonic magnetization conditions are presented and analyzed in detail. Research limitations/implications The capacity of the multi-function harmonic source, used in this work, was not large enough, which limits the magnetization level. Up to now, further improvements to increase the harmonic source capacity and investigations of the electromagnetic behaviors of magnetic steel components under multi-harmonic and DC-AC hybrid excitations are in progress. Originality/value To accurately predict the stray-field loss in magnetic steel plate, the improved method based on the combination of magnetic measurement and numerical simulation is proposed. The effects of the frequency and phase angle on the stray-field loss are analyzed.

Calculation and validation of stray‐field loss in magnetic and non‐magnetic components under harmonic magnetizations based on TEAM Problem 21

“…It is noted that the loss of the coil due to eddy current under load condition is different from that under no-load condition, which should be considered in determination of stray-field loss of structural components. A coefficient denoted by δ can be introduced to take a full consideration of the difference of coils loss varying with eddy current [18]…”

“…It is noted that the loss of the coil due to eddy current under load condition is different from that under no‐load condition, which should be considered in determination of stray‐field loss of structural components. A coefficient denoted by δ can be introduced to take a full consideration of the difference of coils loss varying with eddy current [18] where δ is the coefficient of loss increment related to coils loss, P s−coil is the eddy current loss of coil under load condition in simulation, P s−coil .n is the eddy current loss of coil under no‐load condition in the simulation, P load is the measured total loss under load condition, P no−load is the measured coil loss under no‐load condition, and P t is the stray‐field loss of structure components.…”

Experimental and Numerical Study on Stray Loss in Laminated Magnetic Shielding Under 3-D AC-DC Hybrid Excitations for HVDC Transformers

“…Therefore, the magnetic anisotropy in the bulk material, i.e. the 2-D eddy current region, is simplified as follows: (21) where μx and μy correspond to the equivalent permeability in the parallel direction given in (20), while μz corresponds to the equivalent permeability in the vertical direction given in (18).…”

“…Although a loss ratio was presented for improved experimental determination [15], [16], the stray loss with better accuracy and reasonability can be obtained by taking account of the ohmic loss of the excitation coil. Furthermore, the high-voltage and large-capacity transformers often operate under extreme conditions, including large DC bias [17] and multiple-harmonic excitations [18], [19], etc., which leads to complicated magnetic and loss characteristics of the laminated core. It should be noted that increasing concerns have been focused on the eddy current problem and the corresponding stray loss under 3-D AC-DC hybrid excitations.…”

Modeling and validation of stray-field loss inside magnetic and non-magnetic components under harmonics-DC hybrid excitations based on updated TEAM Problem 21

“…This paper briefly outlines the essential characteristics and the upgrades to the TEAM Problem 21 Family (since 1993), refers to its V.2009 in some detail (Cheng et al, 2009a(Cheng et al, , 2009b(Cheng et al, , 2009c and emphasizes the combination of high-performance analysis methods with advanced material property modeling. For an in-depth investigation of the stray-field loss under harmonics-direct current (HDC) hybrid excitations, a new member-set (P21 e ) of Problem 21 Family is proposed based on the relevant research works that have been conducted recently by our international co-research team (Cheng et al, 2010(Cheng et al, , 2012(Cheng et al, , 2014(Cheng et al, , 2017(Cheng et al, , 2020Zheng and Cheng, 2012;Wang et al, 2013;Zhao et al, 2017Zhao et al, , 2020.…”