Comparison of mechanical deformations due to different force distributions of two equivalent magnetization models

Abstract

In magnetic systems, electromagnetic force density distribution may cause mechanical deformation, which results in the mechanical noise and vibration. The electromagnetic force density can be analyzed with several techniques such as stress tensors, equivalent magnetization models and energy approaches and etc. that may produce different force densities. From the view-point of mechanical deformation, they are theoretically analyzed and compared to explain the differences between the force fields using the property of scalar pressure. In uncompressible media the gradient of scalar pressure, which is a term of Korteweg-Helmholtz force density, does not cause any mechanical deformation. In this paper, two magnetization source models of magnetic charge and magnetization current, which produce quite different distributions of force density, are employed to see their mechanical deformations. Three numerical examples are tested to examine their validity and usefulness.