doi:10.16186/j.cnki.1673-9787.2022020030

Received:2022/02/15

Revised:2023/04/10

Published:2024/05/15

Optimization of electromagnetic performance of star-delta FSPMM based on Taguchi method

CHEN Zhenfei1, FAN Chenyang1, TANG Jun1, WANG Qingyan2, LI Jiayu1

1.School of Electrical and Power Engineering，Hohai University，Nanjing  211100，Jiangsu，China 2.School of Mechanical and Electrical Engineering，Jinling Institute of Technology，Nanjing  211169，Jiangsu，China

Abstract:  Objectives  Fractional slot permanent magnet machine （FSPMM） has been widely used in renewable energy generation and electric vehicles due to its small size，high power density and light weight.In order to further improve the electromagnetic performance of FSPMM，  Methods  two interior V-shaped FSPMM with different armature winding structures were introduced，which were 10-pole 12-slot double-layer star （Y） connection and 10-pole 12-slot four-layer star-delta （Y-Δ） connection windings.The 2-D finite element analysis models of the two FSPMM were established.Secondly，the rules of no-load performance，torque performance and efficiency of FSPMM under different winding structures and different rotor parameters were comprehensively analyzed.The research results showed that the four-layer Y-Δ connection was superior to the double-layer Y connection.Finally，in view of the characteristics of machine parameters and serious coupling，the Taguchi method was proposed to further optimize the rotor parameters of FSPMM with four-layer Y-Δ connection，with torque fluctuation，cogging torque，efficiency and no-load air gap flux density distortion rate as the optimization objectives，permanent magnet thickness，rotor yoke height，slot width，air gap length，flux barrier width of the same magnetic poles and flux barrier width of the adjacent magnetic poles as the optimization factors，thus the optimal rotor parameters were obtained by analyzing the average and variance of the optimization objectives.Then，the effectiveness of Taguchi method in the optimization design of interior FSPMM was verified by using the finite element method.   Results  The research results showed that after optimization，the torque ripple was reduced by 20.24%，the electromagnetic torque was increased by 5.85%，the air-gap flux density distortion rate was reduced by 10.52%，the cogging torque was reduced by 15.52%，and the efficiency could reach 95.54%. Conclusions Compared to the original machine，each electromagnetic performance of the optimized FSPMM had been significantly improved，which verified the effectiveness of Taguchi method in the optimization design of interior FSPMM.  

Key words:fractional slot permanent magnet machine;multilayer-winding;Y-Δ connection;electromagnetic performanceTaguchi method