Round Rotational Single Sheet Tester Research Articles

Finite element level validation of an anisotropic hysteresis model for non-oriented electrical steel sheets

This paper presents the finite element level validation of the anisotropic Jiles–Atherton hysteresis model. Numerical analysis of a round rotational single sheet tester is performed using the 2D finite element method. Anisotropic extension of the Jiles–Atherton hysteresis model is coupled with the 2D finite element method. The finite element simulations are performed for the cases when the magnetic field alternates and rotates in the lamination plane. The simulated results for alternating and rotational flux density excitations agree with the measured data. The measured data used in this paper corresponds to the M400-50A nonoriented silicon steel.

Vector Magnetic Hysteresis Measurement of Nonoriented Electrical Steel Sheets Under Unidirectional Compressive Stress Applied by Piezoelectric Actuators

This paper presents the vector magnetic hysteresis measurement of nonoriented electrical steel sheets under unidirectional compressive stress applied by piezoelectric actuators. We used a round rotational single sheet tester system to measure the vector magnetic hysteresis, where a stator of an induction motor was used to magnetically excite a sample in the in-plane orthogonal directions. To apply stress to the sample, we used commercial film-type piezoelectric actuators, which were directly glued on both surfaces of the sample. The experimental results showed that the compressive stress in the sample was proportional to the dc voltage applied to the actuators and that the loci of the magnetic field in the stress application direction were extended when increasing the compressive stress.

Implementation of the Single Hysteron Model in a Finite-Element Scheme

The single hysteron model is identified to reconstruct the magnetization processes of a grain-oriented electrical steel and it is implemented in a finite-element scheme. The model involves the Zeeman energy and the anisotropy energy of the material and an interaction field to take into account others terms, such as the magnetoelastic energy, the exchange energy, inclusions, and crystallographic discontinuities. The interaction field is evaluated experimentally using a round rotational single sheet tester, where a disk sample of the material is excited for several rotational magnetization processes. Details about the finite-element scheme, the computational time, and the memory allocations involved in the simulations are presented and discussed.

Surface field measurements in vector characterization of Si-Fe magnetic steel samples

In this work we discuss some procedures to increase the accuracy in the measurement of the magnetic field strength using Round Rotational Single Sheet Tester RRSST frames. The procedures are discussed jointly with the use of different magnetic field probes, such as flat coils and Hall sensors, and with a suitable shielding geometry. Experimental comparison between different methods and a discussion about the results is presented.

Transient finite element magnetic field calculation method in the anisotropic magnetic material based on the measured magnetization curves

A lot of magnetic materials are anisotropic. In the 3D finite element method calculation, anisotropy of the material is taken into account. Anisotropic magnetic material is described with magnetization curves for different magnetization directions. The 3D transient calculation of the rotational magnetic field in the sample of the round rotational single sheet tester with circular sample considering eddy currents is made and compared with the measurement to verify the correctness of the method and to analyze the magnetic field in the sample.

Interaction of z component of magnetic field between two samples of GO material in the round rotational single sheet tester (RRSST)

The magnetic properties of two grain-oriented (GO) samples of the same grade were measured under alternating and rotational magnetic flux conditions. Two samples were measured separately and then together in different arrangement to each other. The interaction of magnetic field between two samples were measured by using a coil, which was placed in between. The results show that the H z component influence measured magnetic properties in the x– y plane.

Measurement of alternating magnetic properties of grain-oriented materials using a round rotational single sheet tester

Abstract This paper presents a measurement of grain-oriented electrical steel under pure alternating magnetic flux condition at inclination angles from −90° to 90° with respect to the rolling direction (RD). The measurement was carried out using a round rotational single sheet tester. The results show a strong asymmetry of alternating power loss and magnetic field strength with respect to the RD. The alternating power loss depends on the side of the band where the specimen was cut off.

Field homogeneity in a two-phase round rotational single sheet tester with one and both side shields

Round rotational single sheet tester is used for the measurement of magnetic properties in rotational and alternating magnetic fields. The influence of one and both side shields on the field homogeneity in the sample is investigated with finite element calculation. The aim of the calculation is to define the optimal position of one or both side shields in order to expand the rotational field homogeneity area. We want to reach the area of the homogeneous field as large as possible. The best result is achieved with two sides shielding.

Unreliable determination of vector B in 2-D SST

Rotations of vector B in a square rotational single sheet tester and a round rotational single sheet tester were compared. Two pairs of B coils (45° displaced) were used to control and verify the rotation of vector B at different coil diameters. It was clarified that two sinusoidal induced voltages in B coils do not ensure the rotational flux condition in the area inside the B coils in the sample, especially in a larger measuring region.