Abstract
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.
Highlights
The magneto-mechanical interaction in iron-core materials has been studied intensively to take into account magnetic deterioration due to compressive stressing of the motor core.[5,6,7]
The model parameters are given by material constants, such as the anisotropy constant and magnetostriction constants
The main purpose of this paper is to reveal the mechanism of the loss increase due to the compressive stressing of a silicon steel sheet on the basis of simulation results obtained using the assembled domain structure model (ADSM)
Summary
The magneto-mechanical interaction in iron-core materials has been studied intensively to take into account magnetic deterioration due to compressive stressing of the motor core.[5,6,7] In representing the magneto-mechanical interaction, phenomenological modeling of the magnetization process is not useful because it requires parameter fitting of the measured property, yet a magnetic measurement under an arbitrary vector/tensor combination of magnetization and stress directions is practically difficult. A physical magnetization model is required to predict the stress dependence of hysteresis loss without a magnetic measurement under mechanical stress and the following model parameter fitting. Several physical multiscale models[2,3,8] have successfully been used to predict the permeability decrease dependent on mechanical stress. The prediction of the stress dependence of the hysteresis-loss property[1,2,11] remains a challenging task because the physical modeling of the pinning field is an open problem. The magneto-elastic energy causes magneto-mechanical interaction in the core material, yielding stress-dependent magnetic properties.[3] The pinning field is simulated under an assumption of a statistical distribution of pinning sites.[3]
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