Complete Nonlinear Magnetic-Thermal-Stress Design of Radial Field Multipole NdFeB Permanent Magnet Cylinder

This paper presents a complete modeling approach for the analysis of the magnetization of a radial field multipole NdFeB permanent magnet cylinder. The simulation approach involves the 3D finite element parametric study of a permanent magnet rotor structure to extract electromagnetically equivalent state space variables. These variables are transferred to a circuit simulator where the genetic algorithm is used to optimize the circuit parameters of the magnetizing fixture. To validate the results of the optimized solution, a 3D time-stepping finite element analysis coupled with an embedded circuit simulator is employed. Further, a transient thermal analysis is performed to determine the effect of the resistive losses in the permanent magnet during the electromagnetic pulse. The high forces generated during magnetization process are solved by means of a 3D finite element analysis static stress simulation and the structural deformation is computed