Abstract
In this work, a multiscale analysis of an electropermanent magnet in an actuator is carried out. The electropermanent magnet is heterostructured magnet composed of hard and soft ferromagnetic materials. Due to the soft ferromagnetic material (i.e., iron), the magnetic field of the magnet can be controlled by external current in a winding around the magnet. It is expected that the electropermanent magnet can enhance the mechanical force performance of magnetic actuators. For the fast and efficient analysis of the heterostructured electropermanent magnet, its multiscale analysis is proposed in this work. Through the microscale analysis, the homogenized effective magnetic permeability and residual magnetic flux density of the magnet are calculated by applying asymptotic homogenization method. The computed effective properties are utilized in the macroscale actuator model, and consequently the magnetic field distribution and magnetic force in actuators are calculated. The accuracy and computational benefit of the proposed multiscale analysis are validated by comparing the analysis result obtained by direct finite element analysis of heterostructured electropermanent magnet.
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