Fem‐Based Analysis Techniques for Electrical Machine Design

The Newton‐Raphson technique for the solution of nonlinear problems in finite element analysis (FEA) has been widely accepted due to its quadratic convergence characteristics. This chapter introduces an indirect approach with parameter coupling. It also introduces an efficient method, referred to as alternating flux linkage (AF) model, to speed up the transient process for reaching fast AC steady state, almost suitable for all AC machines. Transient electromagnetic field simulation allows analysis of dynamic behaviors with nonlinear materials, permanent magnets, and induced eddy currents under various excitations. The basic procedure of transient simulation includes the spatial and temporal discretization of the physical equations. The finite element method (FEM) is widely used in engineering practice because using the irregular grids it can represent complicated geometry. The chapter explores some advanced algorithms to create look‐uptable based ROMs, and some efficient techniques to reduce computational time at specified density of the sampling points.