Generalized Algorithm to Deal With Temperature-Dependent Demagnetization Curves of Permanent Magnets for FEA

Abstract

This article introduces a temperature-dependent demagnetization model and presents a generalized algorithm to deal with temperature-dependent demagnetization curves for permanent magnet materials. It supports the input of both intrinsic curve type and normal curve type. The algorithm is based on the intrinsic curve type. If the input curves are of normal type, they will be converted into intrinsic type and be extended to the whole second quadrant. The presented algorithm is validated by comparing the derived curves at specified temperatures with the original vendor-provided temperature-dependent demagnetization curves of various permanent magnet (PM) materials. The temperature effects on the performance of permanent magnet machines are illustrated in two application examples.