Finite element analysis of high field permanent magnet mechanism using vector Preisach hysteresis model
This paper presents a method to simulate abnormal magnetizations in high field permanent magnet mechanism. Abnormal magnetizations including local saturation, local demagnetization and rotational magnetization occur in the assembly process of high field permanent magnet mechanism. Combining an anisotropic vector Preisach model and finite element analysis, abnormal magnetizations are simulated comprehensively. The method only requires the data of limiting magnetic hysteresis loops of the material along easy and hard axis, so the application of vector Preisach model becomes convenient and efficient. A sixteen elements enhanced magic ring is designed and the process of assembling is simulated, which verify the validity of the presented method.
Vector hysteresis model for unoriented magnetic materials
Presented in this paper is a vector hysteresis model for unoriented magnetic materials expanded from the magnetization-dependent Preisach model. Namely, the Preisach elements have rotational capabilities and they memorize their directions, and the Preisach plane is divided into reversible, irreversible regions and the regions maintaining their previous states. By integrating the Preisach plane vectorially for the magnitude-varying rotating field, the hysteresis phenomena such as the directions and magnitude of the magnetization and the hysteresis losses can be calculated. >
Identification problem for 3-D anisotropic Preisach model of vector hysteresis
3-D anisotropic vector Preisach models of hysteresis are discussed, and the identification problem of fitting these models to experimental data is posed. By using some simple facts from the theory of irreducible representations of the group of rotations, it is shown that this identification problem can be reduced to the solution of some special integral equations. Different techniques for the solution of these equations are explored. >