Modeling anisotropic magnetic hysteresis properties with vector stop model by using finite element method

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiao Xiao ◽  
Fabian Müller ◽  
Martin Marco Nell ◽  
Kay Hameyer
Keyword(s):  
Finite Elements ◽  
Electrical Steel ◽  
Magnetic Hysteresis ◽  
Electrical Machines ◽  
Hysteresis Model ◽  
Time Step ◽  
Content Type ◽  
Steel Sheets ◽  
Electrical Steel Sheets ◽  
Finite Elements Simulation

Purpose This paper aims to use a history-dependent vector stop hysteresis model incorporated into a two dimensional finite elements (FE) simulation environment to solve the magnetic field problems in electrical machines. The vector stop hysteresis model is valid for representing the anisotropic magnetization characteristics of electrical steel sheets. Comparisons of the simulated results with measurements show that the model is well appropriate for the simulation of electrical machines with alternating, rotating and harmonic magnetic flux densities. Design/methodology/approach The anisotropy of the permeability of an electrical steel sheet can be represented by integrating anhysteretic surfaces into the elastic element of a vector hysteresis stop model. The parameters of the vector stop hysteresis model were identified by minimizing the errors between the simulated results and measurements. In this paper, a damped Newton method is applied to solve the nonlinear problem, which ensures a robust convergence of the finite elements simulation with vector stop hysteresis model. Findings Analyzing the measurements of the electrical steel sheets sample obtained from a rotational single sheet tester shows the importance to consider the anisotropic and saturation behavior of the material. Comparing the calculated and measured data corroborates the hypothesis that the presented energy-based vector stop hysteresis model is able to represent these magnetic properties appropriately. To ensure a unique way of hysteresis loops during finite elements simulation, the memory of the vector stop hysteresis model from last time step is kept unchanged during the Newton iterations. Originality/value The results of this work demonstrates that the presented vector hysteresis stop model allows simulation of vector hysteresis effects of electrical steel sheets in electrical machines with a limited amount of measurements. The essential properties of the electrical steel sheets, such as phase shifts, the anisotropy of magnetizations and the magnetization characteristics by alternating, rotating, harmonic magnetization types, can be accurately represented.

Combined Preisach–Mayergoyz-neural-network vector hysteresis model for electrical steel sheets

2003 ◽  
Vol 93 (10) ◽  
pp. 6638-6640 ◽  
Author(s):  
Dimitre Makaveev ◽  
Luc Dupré ◽  
Marc De Wulf ◽  
Jan Melkebeek
Keyword(s):  
Neural Network ◽  
Electrical Steel ◽  
Hysteresis Model ◽  
Steel Sheets ◽  
Electrical Steel Sheets

Effect of mechanical stress on different iron loss components up to high frequencies and magnetic flux densities

2017 ◽  
Vol 36 (3) ◽  
pp. 580-592 ◽  
Author(s):  
Jan Karthaus ◽  
Simon Steentjes ◽  
Nora Leuning ◽  
Kay Hameyer
Keyword(s):  
Mechanical Stress ◽  
Electrical Steel ◽  
Mechanical Stresses ◽  
Iron Loss ◽  
Content Type ◽  
High Frequencies ◽  
Steel Sheets ◽  
Iron Losses ◽  
Loss Component ◽  
Electrical Steel Sheets

Purpose The purpose of this paper is to study the variation of the specific iron loss components of electrical steel sheets when applying a tensile mechanical load below the yield strength of the material. The results provide an insight into the iron loss behaviour of the laminated core of electrical machines which are exposed to mechanical stresses of diverse origins. Design/methodology/approach The specific iron losses of electrical steel sheets are measured using a standardised single-sheet tester equipped with a hydraulic pressure cylinder which enables application of a force to the specimen under test. Based on the measured data and a semi-physical description of specific iron losses, the stress-dependency of the iron loss components can be studied. Findings The results show a dependency of iron loss components on the applied mechanical stress. Especially for the non-linear loss component and high frequencies, a large variation is observed, while the excess loss component is not as sensitive to high mechanical stresses. Besides, it is shown that the stress-dependent iron loss prediction approximates the measured specific iron losses in an adequate way. Originality/value New applications such as high-speed traction drives in electric vehicles require a suitable design of the electrical machine. These applications require particular attention to the interaction between mechanical influences and magnetic behaviour of the machine. In this regard, knowledge about the relation between mechanical stress and magnetic properties of soft magnetic material is essential for an exact estimation of the machine’s behaviour.

scholarly journals Influence of the mechanical fatigue progress on the magnetic properties of electrical steel sheets

2017 ◽  
Vol 66 (2) ◽  
pp. 351-360 ◽  
Author(s):  
Jan Karthaus ◽  
Simon Steentjes ◽  
Daniel Gröbel ◽  
Kolja Andreas ◽  
Marion Merklein ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electrical Steel ◽  
Electrical Machines ◽  
Centrifugal Forces ◽  
Steel Sheets ◽  
Mechanical Fatigue ◽  
Material Fatigue ◽  
Number Of Cycles ◽  
The Impact ◽  
Electrical Steel Sheets

AbstractThe purpose of this paper is to study the variation of the magnetic properties of non-oriented electrical steel sheets with the fatigue state during cyclic mechanical loading. The obtained results are central to the design of variable drives such as traction drives in electric vehicles in which varying mechanical loads, e.g. in the rotor core (centrifugal forces), alter the magnetic properties. Specimens of non-oriented electrical steel are subject to a cyclically varying mechanical tensile stress with different stress amplitudes and number of cycles. The specimens are characterised magnetically at different fatigue states for different magnetic flux densities and magnetising frequencies. The measurements show a variation in magnetic properties depending on the number of cycles and stress magnitude which can be explained by changes in the material structure due to a beginning mechanical fatigue process. The studied effect is critical for the estimation of the impact of mechanical material fatigue on the operational behaviour of electrical machines. Particularly in electrical machines with a higher speed where the rotor is stressed by high centrifugal forces, material fatigue occurs and can lead to deterioration of the rotor’s stack lamination.

Measurement and modelling of rotational anomalous loss considering skin effect of electrical steel sheets

2017 ◽  
Vol 36 (6) ◽  
pp. 1750-1758
Author(s):  
Jingsong Li ◽  
Lixiang Wang ◽  
Qingxin Yang ◽  
Shanming Wang ◽  
Yongjian Li ◽  
...  
Keyword(s):  
Skin Effect ◽  
Electrical Steel ◽  
Engineering Application ◽  
Calculation Model ◽  
Loss Coefficient ◽  
Content Type ◽  
Steel Sheets ◽  
Local Overheating ◽  
Core Losses ◽  
Electrical Steel Sheets

Purpose Due to existence of skin effect under rotational excitation, especially to high-frequency motors and power transformers run at the frequency of hundreds or even thousands of hertz, core losses will increase significantly, which may cause local overheating damage, and the efficiency and longevity will be decreased. The purpose of this paper is to accurately calculate the rotational anomalous loss in electrical steel sheets. Design/methodology/approach The influence of skin effect to rotational anomalous loss coefficient is described in detail. Based on the rotational core losses calculation approach, the transformed coefficient and parameters of rotational anomalous loss are determined in accordance with experimental data obtained by using 3D magnetic properties testing system. Then, a variable loss coefficient calculation model of rotational anomalous loss is built. Meanwhile, a separation of the total 2D elliptical rotation experimental core losses is worked out. Findings The two methods are analysed and compared qualitatively. It should be noted that the novel calculation model can be more effectively presented anomalous loss features. Moreover, quantitative comparisons between 2D elliptical rotation and alternating core losses have achieved beneficial conclusions. Originality/value Transformed rotational anomalous loss coefficient and parameters of electrical steel sheets considering skin effect are determined. Based on that, a novel calculation model evaluating 2D elliptical rotation anomalous loss is presented and verified based on the experimental measurement and the separation of the total 2D elliptical rotation core losses. The 2D elliptical rotation core losses separation method and quantitative comparison with alternating excitation are helpful to engineering application.

scholarly journals Modeling the Effect of Multiaxial Stress on Magnetic Hysteresis of Electrical Steel Sheets: A Comparison

2017 ◽  
Vol 53 (6) ◽  
pp. 1-4 ◽  
Author(s):  
U. Aydin ◽  
P. Rasilo ◽  
F. Martin ◽  
D. Singh ◽  
L. Daniel ◽  
...  
Keyword(s):  
Electrical Steel ◽  
Magnetic Hysteresis ◽  
Multiaxial Stress ◽  
Steel Sheets ◽  
Electrical Steel Sheets
Sign in / Sign up

Export Citation Format

Share Document