Demagnetization Research on PMs in the Halbach Magnetized Pulsed Alternator  

作　　者：Songlin Wu Shaopeng Wu Weiduo Zhao Shumei Cui 

机构地区：[1]Department of Electrical Engineering,Harbin Institute of Technology,Harbin 150080,China [2]International Academy of the Marine Economy and Technology,University of Nottingham,Ningbo 315000,China

出　　处：《CES Transactions on Electrical Machines and Systems》2019年第2期170-177,共8页中国电工技术学会电机与系统学报（英文）

基　　金：This work was supported by the Natural Science Foundation of China under Grant 51307031 and part by the Natural Science Foundation of Heilongjiang Province under Grant E2018034 and China Postdoctoral Science Foundation funded project under Grant 2019M651185.

摘　　要：Demagnetization behavior of Halbach magnetized compensated pulsed alternator(CPA)is studied by using finite element method(FEM)under the different demagnetization factors in this paper.The effect of armature reaction magnetic field and thermal rise on demagnetization of PMs is analyzed.This paper investigates the effect of different demagnetization factors on magnetic field distribution,load current,and no-load phase voltage.A series of dynamic demagnetization points in Halbach array permanent magnet(PM)are evaluated to search the worst working point.Partial demagnetization risk can be represented by the worst working point,and the global demagnetization of the PM is represented by the no-load phase voltage characteristics after discharge.The research results demonstrated that the compensation shield with a certain thickness can increase the discharge current and weaken the demagnetization influence of armature reaction.The demagnetization effect of armature reaction on PMs at high temperatures will be strengthened.

关 键 词：Armature reaction dynamic demagnetization finite element method(FEM) pulsed alternator thermal rise. 

分 类 号：TG1[金属学及工艺—金属学]