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《Journal of Nanjing University of Aeronautics & Astronautics》 2018-03
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Analysis and Design of PMSM with Fractional-Slot Concentrated Windings

JIANG Renhua;LIU Chuang;NING Yinhang;WANG Chengyu;College of Automation Engineering,Nanjing University of Aeronautics & Astronautics;School of Electrical Engineering,Shanghai Dianji University;  
Permanent magnet synchronous machine(PMSM)with fraction-slot concentrated-winding(FSCW)is popularly applied in the field of aerospace and electric vehicle for its good flux-weakening capability,low cogging torque,and high torque density and efficiency.This paper mainly focuses on the PMSM-FSCW used for airborne radar servo system.With the magnetic circuit characteristics of PMSMFSCW,the analytic model of the motor is established.Influences of some design parameters,such as number of poles,ratio of length to diameter,split ratio and magnetic flux density coefficient on the motor performance are studied.Analytical results show that output torque and weight of the motor are respectively proportional to the outer diameters of stator,D3 osand D2 os,and the percentage of coil end to whole windings is inversely proportional to the ratio of stator length to its outer diameterλ.In view of torque density and percentage of coil end mentioned above,the value ofλis recommended from 0.2 to0.4.When split ratioγ,i.e.the ratio of stator inner diameter Disto outer diameter Dos,raises,output torque firstly increases and then decreases.Hence theγis advised to select in the range of 0.6—0.8 for the maximum torque density.When the ratio of the largest flux density in the stator iron core to air-gap flux densityχenlarges,output torque firstly increases and then decreases.χshould be designed at aboutthe value of 1.75 for the maximum output torque.Based on the theoretical analysis and simulation results above,aprototype of PMSM-FSCM,with the combination of 45-slot/38-pole,is designed and manufactured,and its performance is experimentally tested.
【Fund】: 国家自然科学基金(50977044 51377076)资助项目;; 江苏省产学研基金(BY2014003-09)资助项目;; 江苏省“六大人才高峰”(YPC13013)资助项目
【CateGory Index】: TM341
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