A Vector Play Model for Finite-Element Eddy-Current Analysis Using the Newton-Raphson Method

The differentiation of the vector hysteretic function represented by a vector play model is discussed for efficient nonlinear electromagnetic field computation using the Newton-Raphson method. The combination of the nonlinear finite-element method and the vector play model achieves accurate representation of the AC anisotropic magnetic property of nonoriented silicon steel sheet under rotational magnetic flux conditions. The proposed method is successfully applied to the eddy-current analysis of iron-cored inductors excited by a current or voltage source

A Simplified Domain Structure Model Exhibiting the Pinning Field

A simplified domain structure model (SDSM) is developed as a building block with which to construct a physical macroscopic magnetization model exhibiting pinning-type hysteresis. The pinning field is represented by a stop hysteron. The proposed SDSM represents the vector magnetic property of a silicon steel sheet qualitatively. A preliminary analysis of the magnetization process described by the assembled SDSMs is reported, where the local demagnetizing field reduces the coercive force

Efficient methods for macroscopic magnetization simulation described by the assembly of simplified domain structure models

This article presents two methods for the fast computation of macroscopic magnetization model called assembled domain structure model. First, an efficient method for computing the demagnetizing field is proposed. Secondly, a direct searching method of equilibrium point is developed, which greatly reduce the computation time

Simulation of the stress dependence of hysteresis loss using an energy-based domain model

The assembled domain structure model (ADSM) is a multiscale magnetization model that can be used to simulate the magnetic properties of a core material. This paper reveals the mechanism of the hysteresis loss increase due to compressive stress applied to a silicon steel sheet by conducting a simulation using the ADSM. A simple method of adjusting the simulated hysteresis loss to the measured loss is also proposed. By adjusting the hysteresis loss under a stress-free condition, the stress dependence of the hysteresis loss of a non-oriented silicon steel sheet is quantitatively reconstructed using the ADSM, where the stress-induced anisotropy strengthens the pinning effect along the stress direction