Permanent Magnet Non-Linear Demagnetization Model for FEM Simulation Environment

Robustness and reliability of modern synchronous motors require an accurate design of the permanent magnets (PMs) while accounting for the motor operating conditions (demagnetizing field and temperature). In this article, the important attribute of a PM non-linear demagnetization model within a finite element method (FEM) simulation environment is clearly emphasized. To do so, starting from the experimental measurement achieved on an NdFeB PM, a toolbox named “PM-Demag” has been developed. This toolbox manages the PM history and updates the PM $B(H)$ characteristics depending on the temperature and the PM working point. Finally, a relatively straightforward coupling is implemented with an FEM software and applied to a simple study case. The results show local magnetization loss in the PM due to the combination of both the temperature and the demagnetizing field.