Precise calculation and optimization of rotor eddy current losses in high speed permanent magnet machine

Abstract

This paper describes a precise 2-dimensional analytical method for calculation of induced eddy current losses inside the rotor of high speed permanent magnet machines. Unlike Previous methods, the method introduced in this paper is flexible and can be used for any surface mounted permanent magnet machine with different rotor layers materials and dimensions. The method is primarily introduced by calculating the field of armature current for both space and time harmonics in the permanent magnet machine that is rotating at 130 Krpm with 30 KW of air gap power. Using the Poynting vector theorem, the induced eddy current loss is calculated in each layer of the rotor. Based on this method, the optimizations are performed on the rotor losses with respect to different rotor layers materials and dimensions and optimum rotor layers combinations and dimensions are achieved.