Iron loss calculation and 3-D thermal analysis of Halbach array permanent magnet synchronous motor

Abstract

This paper presents the thermal analysis of a fivephase Halbach array permanent magnet synchronous machine. The iron loss is calculated using a hybrid analytical finite element method with segmenting the stator into six parts. The proposed method is compared with both conventional method and pure finite element method. The results show that the proposed technique is accurate whereas it is more simple and time efficient than pure finite element analysis. Higher harmonics losses are also taken into account in the presented technique. Joule losses including end winding loss and also permanent magnet eddy current loss are then calculated and used in a 3-D thermal analysis by finite element method. Thermal distribution and hot spots are determined and a water based cooling system is finally designed for the motor in the worst-case scenario to keep the magnet temperature in a safe range.