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.
A simplified vector Preisach model
Although scalar Preisach models have been increasingly accurate and efficient in describing material behavior, vector models, necessary to quantize complex magnetizing processes, are not as well developed. This paper presents a coupled vector model where the coupling is performed by a set of selection rules, after which the individual components can be calculated independently, This model reduces to a scalar model under appropriate conditions and the identification of its parameters is very straightforward.
Characteristics of the complete moving hysteresis model
Moving‐type Preisach‐derived models computing both the irreversible and the locally reversible components of the magnetization accurately characterize magnetic recording materials exhibiting hysteresis. Experimental results show that the derivative of the major remanent loop is not a symmetrical function of the applied field. It is shown that the complete moving hysteresis model can compute such an asymmetrical variation with a symmetrical Preisach function. It is also shown that this asymmetry is due to the reversible magnetization. Additional properties of moving‐type models are also discussed.