Iron Loss Prediction Using Modified IEM-Formula during the Flux Weakening for Permanent Magnet Synchronous Machines

Abstract

During field weakening operation time (FWOT), the total iron loss rises and affects the 11 accuracy of loss prediction and efficiency especially if a large range of FWOT exists due to a large 12 voltage drop which rooted from the resistance of the used material. Iron loss prediction is widely 13 employed in investigations for a fast electrical machine analysis using 2-D FEA. This paper proposes 14 harmonic loss analytically by a steady-state equivalent circuit with a novel procedure. 15Consideration of skin effects and iron saturation are utilized in order to examine the accuracy 16 through the relative error distribution in the frequency domain of each model from 50 to 700 Hz. 17Additionally, this comparative study presents a torque-frequency-field density calculation over 18 each single term of the modified IEM-formula. The proposed analytical calculation is performed 19 using 2-D FEA for a classic and modified IEM-formula along with experimental verifications on a 20 surface-mounted permanent magnet synchronous generator (PMSG) for a wind generation 21 application. 22