Properties Of Silicon Steel Sheet Research Articles

Study on magnetostrictive properties of oriented silicon steel sheet under different working conditions

Accurate measurement of magnetostriction is the basis for calculating the vibration of silicon steel laminated core. In this paper, a laser magnetostriction measurement system (MST500) is used to study the magnetostriction characteristics of silicon steel under sinusoidal, third harmonic, and DC bias magnetization. The magnetostrictive butterfly curves, time domain waveforms, and spectrum diagrams of silicon steel sheets under different excitations are compared and analyzed. The effects of different operating conditions on the magnetostrictive properties of silicon steel sheets were studied and analyzed, mainly including amplitude and spectrum analysis. Finally, the magnetostrictive peak to peak curves under different operating conditions were extracted, providing a data basis for the core vibration of power equipment.

Investigation of the main factors affecting the magnetic properties of silicon steel sheets by comparing three kinds of silicon steel

As an important magnetic material, silicon steel is widespread used in various motors, generators, relays and transformers. It is of great significance to explore the factors affecting the magnetic properties of non-oriented silicon steel. This paper introduces the production process of 50W800, 50W600 and 35W550 non-oriented silicon steel, and compares their magnetic properties, observes the microstructure of silicon steel sheet under hot rolling, cold rolling and annealing three technological states, analyzes the influence of sheet thickness, composition, microstructure and impurity on the magnetic properties of non-oriented silicon steel. The results can be summarized as follows: (1) The magnetic properties of the silicon steel sheet can be improved to a certain extent by reducing the thickness of the silicon steel sheet.(2) Increasing silicon content in a certain range can reduce core loss of silicon steel. (3) After annealing, the grain size of cold rolled silicon steel sheet becomes larger, the defect of grain decreases, the loss of iron core decreases, and the finished silicon steel sheet with good magnetic properties is obtained.

Study for Influence of Harmonic Magnetic Fields on Vibration Properties of Core of Anode Saturable Reactor in HVDC Converter Valve System

The cores of anode saturated reactor (ASR) are the main vibration source of the HVDC converter valve system. The ASR is excited with an impulse voltage, which contains many harmonic components, and the magnetostriction of cores is usually the main reason of the ASR vibration. Therefore it is significant to study the influence of the harmonic on the vibration of core of ASR. In this paper, the magneto-mechanical coupling model is established based on the magnetostriction theory and the expression of vibration acceleration in the presence of third harmonic is derived. The vibration test platform is built to test the core's vibration acceleration. The magnetic and magnetostrictive properties of silicon steel sheet under different working conditions are measured. The three-dimensional simulation model of the core is established, and the vibration acceleration under different magnetic flux density is calculated. The comparison of the experiment and simulation results shows the rationality of the magneto-mechanical coupling model. The influence of third harmonic magnetic flux density on vibration is studied by changing the phase of the third harmonic magnetic flux density and the ratio of the third harmonic magnetic flux density to the fundamental magnetic flux density. Both the calculated and measured results show that the third harmonic magnetic flux density affects the vibration acceleration according to the double-frequency components of the third harmonic, as well the sum-frequency and difference-frequency components of the third harmonic and fundamental frequency.

Magnetostrictive properties of silicon steel sheet under excitation of different types

Magnetostrictive properties of silicon steel sheet under excitation of different types

Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Due to the requirement of magnetic properties of silicon steel sheets, producing high-precision size strips is the main aim of the cold rolling industry. The tapered work roll shifting technique of the six-high cold rolling mill is effective in reducing the difference in transverse thickness of the strip edge, but the effective area is limited, especially for a high crown strip after the hot rolling process. The six-high mill with a small work roll size can produce a strip with higher strength and lower thickness under a smaller rolling load. At the same time, the profile of the strip can be substantially improved. By advancing a well-established analytical method, a series of simulation analyses are conducted to reveal the effectiveness of a small work roll radius for the strip profile in the six-high cold rolling process. Through the analysis of flattening deformation and deflection deformation on the load, the change rule of the strip profile produced by the work roll with a small roll diameter can be obtained. Combined with theoretical analysis and industrial experiments, it can be found that the improvement effect of the small work roll radius on the profile of the silicon strip is as significant.

Effects of Uniaxial Stress Along Different Directions on Alternating Magnetic Properties of Silicon Steel Sheets

Extensive research has shown that silicon steel sheets in electrical machines and power transformers are usually working under compressive or tensile stress, which affects both magnetic properties of silicon steel sheets and performance of electromagnetic devices. In this article, a magnetic property measurement system considering the stress effect has been developed and constructed based on the large cross-shaped single-sheet tester (LCSST). The uniformity of the stress distribution for LCSST is verified by the finite-element method. The B-H magnetic property of a specimen of non-oriented silicon steel 50JN470 in the direction of applied stress is measured by the proposed LCSST, and the results are in good agreement with those measured by the rectangle single-sheet tester (RSST) made by the Brockhaus Company. The RSST, however, cannot measure the effects of uniaxial stress on the magnetic properties. This article presents and analyzes the extensive experimental results of magnetic properties with uniaxial stress applied along both transverse and rolling directions ranging from 7 MPa compressive stress to 7 MPa tensile stress.

Study on Dynamic Hysteretic and Loss Properties of Silicon Steel Sheet Under Hybrid Harmonic and DC Bias Excitation

The dynamic and static hysteresis properties as well as loss properties of grain oriented (GO) silicon steel sheet are measured under the AC-DC hybrid excitation containing both DC bias and harmonic components. The influence of the DC-biasing magnetic field, harmonic orders and phase shift angles on the iron loss is analyzed in depth based on the experimental data under different excitations. A dynamic hysteresis model and the parameter identification method is presented to simulate the asymmetrical hysteresis curve with minor loops. According to the equivalence between loss separation and field separation, the static part of magnetic field intensity are calculated by an improved Preisach model, while the dynamic parts are obtained by fitting the classical loss as well as excess loss. The consistency between simulation and measurement verifies the effectiveness and accuracy of the proposed method.

Transient potential distribution on transformer winding considering the effect of core lamination stack

The potential distribution of windings under impulse voltage is very important for the design of transformer inter-turn insulation especially for large capacity transformers such as ultra-high voltage direct current (UHVDC) converter transformer. Quite a lot of equivalent circuit models for transformer winding have been proposed for the potential distribution calculation assuming that the influence of magnetic core is negligible at frequencies higher than 10 kHz. However, lightning impulse or VFTO waveforms usually contain abundant frequency components higher than 10 kHz. At above situations the magnetic core plays an important role during the transient procedure. To obtain a more comprehensive model and also to provide a more accurate potential distribution of transformer winding, in this paper, a wide frequency magnetic properties of silicon steel sheet were measured and the relationship between relative permeability of lamination stack and frequency is studied and implemented in the calculation of frequency-dependent parameters such as resistance, self- and mutual-inductances. Then the equivalent circuit model of UHVDC converter transformer is established considering the properties of core lamination stack. Coding the program in MATLAB to solve the matrix equation and the potential distribution properties are extracted from the calculation results under lightning situation. The inter-turn potential distribution is also analyzed and the results may provide more accurate information for transformer inter-turn insulation design.

Several modeling methods for representation of AC magnetic properties of electrical steel sheets taking account of skin effect

AbstractSeveral homogenized models are compared for accurate representation of the AC magnetic properties of silicon steel sheets. Two of them are the generalized Pry and Bean models, which have a parameter for the frequency dependence of eddy‐current loss. The third model assumes a quadratic distribution of the magnetic flux density along the thickness direction. The other model is an extension of the linear magnetization model. Numerical simulations show that the third model yields inaccurate BH loops whereas the other models accurately represent BH loops. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 177(3): 9–16, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.21180

Several Modeling Methods for Representation of AC Magnetic Properties of Electrical Steel Sheets Taking Account of Skin Effect

Several homogenized models are compared for accurate representation of ac magnetic properties of silicon steel sheets. Two of them are generalized Pry and Bean models that have a parameter for the frequency dependence of eddy-current loss. The third model assumes a quadratic distribution of magnetic flux density along the thickness direction. The other model is an extension of linear magnetization model. Numerical simulations show that the third model yields inaccurate BH loops whereas the other models accurately represent BH loops.

Examination of Temperature Characteristics of Magnetic Properties Using a Single Sheet Tester

If the magnetic field in a magnetic device which is operated at high temperature, for example 100 °C, is analyzed using magnetic characteristics at a room temperature ( RT ), there occur some errors. Although the measurement method using a single sheet tester ( SST ) has advantages that the material characteristics can be measured precisely, the research about the correlation between the temperature and the magnetic characteristics using SST is few. In this paper, firstly, the temperature characteristics of magnetic properties of silicon steel sheet were measured using SST, then, the temperature characteristics of the iron loss of the permanent magnet motor were estimated by using the finite element method ( FEM ). It is shown that the permeability is increased at low flux density, and decreased at high flux density when the temperature is increased. The iron loss is decreased similarly in almost all range of Bm. The change of iron loss is remarkable in the low grade steel ( 50A1300 ). The iron loss of SPM motor at 100 °C is decreased by about 10-20 % compared with that at RT.

Determination of the frictional properties of coated steel sheets

A test method for the determination of the frictional properties of silicon steel sheet with a surface coating are discussed. The frictional properties of this sheet are represented by a coefficient of the friction–strain curve. The frictional properties of the coatings are described by a curve representing the difference between the coefficient of friction of the uncoated sheet and that of the coated sheet versus the strain of the sheet.

Magnetic Properties of Silicon Steel Sheets with a Bias Field

The magnetic properties of silicon steel sheets with a bias field are described. In the analysis, the magnetization characteristics under a sinusoidal-flux condition are approximated by the Fourier series, and it is assumed that the eddy current factor is proportional to the rate of change of the flux. The magnetization characteristics with a bias field are modeled by three magnetization curves under a sinusoidal-flux condition with a different maximum flux density. The iron loss, maximum value and harmonic component of exciting current are obtained by the numerical analysis of the relation between the dc current. The results of the analysis were confirmed by experiments, and are used to show the magnetic properties of a power transformer with a bias field using magnetic properties under a sinusoidal-flux condition.

TiNコーティング前のArボンバード処理による珪素鋼板の磁気特性の変化

TiNコーティング前のArボンバード処理による珪素鋼板の磁気特性の変化

Two-dimensional magnetic properties of silicon steel sheet subjected to an alternating field

In conventional magnetic measurements, only the same components of the magnetic flux density B and the magnetic field intensity H in the excited direction are measured as scalar values. We have used a two-dimensional magnetic measuring apparatus to understand the magnetization process of B and H having a phase difference in space, because the values should be treated as vector values. Two-dimensional magnetic properties quite differ from conventional properties.

Two-dimensional magnetic properties of silicon steel sheet subjected to a rotating field

A study of the two-dimensional rotational magnetic properties of a steel sheet are discussed. These are measured making use of the vector relation between magnetic field strength H and magnetic flux density B. The results of this study lead to the following main conclusions: the permeability tensor becomes a full matrix under rotating flux; the off-diagonal terms of the permeability tensor are antisymmetric when the axis ratio of rotating flux is 1.0; and the mu /sub xy/ and mu /sub yx/ terms are due to rotational hysteresis. >

Two-Dimensional Magnetic Properties of Silicon-Steel Sheet

The magnetic properties of silicon steel sheet under conditions of two-dimensional excitation (circular, elliptic and alternating the rotation direction) were investigated. "Two-dimensional magnetic measurement" is a generic term introduced recently to describe the measurement of magnetic properties of a specimen under conditions of a rotating magnetic induction. The two-dimensional magnetic properties in silicon steel sheet are very sensitive to the axis ratio and the angle of inclination of the major axis of the induction, because they are very sensitive to the anisotropy of the material.

けい素鋼板の２次元磁気特性

The magnetic properties of silicon steel sheet under the condition of two-dimensional excitation (circular, elliptic and alternating with rotation of the direction) are investigated. Two-dimensional magnetic measurement is a generic term introduced recently to comprise the measurement of magnetic properties of a specimen under the condition of rotating magnetic induction. Two-magnetic properties in silicon steel sheet are very sensitive to the axis ratio and the inclination angle of the magnetic flux density of longitudinal axis,because that is very effective to the anisotropy of the sheet.

Magnetic Properties of Silicon Steel Sheet at High Frequencies

Magnetic Properties of Silicon Steel Sheet at High Frequencies