A Field Reconstruction Technique for Efficient Modeling of the Fields and Forces within Induction Machines

Abstract

Traditional analysis and design of induction machines have been largely based upon lumped-parameter models. An alternative tool used for fields-based evaluations of an induction machine is the finite-element method. Although useful, its computational complexity limits its use as a design tool. In this paper, a field reconstruction (FR) method for induction machine simulation is introduced The FR method utilizes a small number of finite-element evaluations to establish basis functions of normal and radial flux densities. The basis functions are then used to estimate the magnetic field under arbitrary stator excitation. Using such a tool, evaluation of fields and forces produced by the machine under alternative excitation strategies can be explored efficiently. Moreover, alternative fields-based derivation of stator/rotor excitation control can be explored.