环形永磁体夹置式混合励磁无刷爪极发电机的研究  

Study on a hybrid excitation brushless claw-pole alternator with an annular PM between the claw poles

作　　者：乔东伟[1] 王秀和[1] 朱常青[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061

出　　处：《电机与控制学报》2014年第5期30-35,共6页Electric Machines and Control

基　　金：高等学校博士学科点专项科研基金(20110131110010)

摘　　要：为解决永磁发电机磁场调节困难和电励磁爪极发电机因存在电刷—滑环结构而导致的工作可靠性低的问题,提出了一种混合励磁无刷爪极发电机,由永磁体和励磁绕组共同产生气隙磁场,励磁绕组通过励磁支架固定在端盖,取消了电刷—滑环结构,且可以方便地通过调节励磁电流进行气隙磁场的调节。采用三维有限元法对电机的空载磁场分布及磁场调节能力进行了分析,确定了永磁体的合理尺寸。分析结果表明:采用新型混合励磁结构后,气隙平均磁密得到了较大提高,从而增大了电机的功率密度,改善了电机的低速发电性能;同时用较小的励磁电流即可产生较大的气隙磁密,降低了电机的励磁损耗。To overcome the problems of magnetic field regulation in permanent magnet alternators and reli- ability of brush-ring structure in ordinary claw-pole alternators, a hybrid excitation claw-pole alternators （HEBCA） is proposed in this paper. The magnetic field was produced by permanent magnets and excita- tion winding： Excitation winding was fixed on the bracket, and the bracket was fixed to the end cover. Thus the brush-ring structure was eliminated. The magnetic field can be regulated easily by changing the current in excitation winding. The machine topology and operation principle were described. The no-load magnetic field distributions and the capability of flux control were obtained based on three dimensional fi- nite element analysis （3-D FEA）. It shows that HEBCA has higher power density and air gap flux densi- ty in comparison with electrically-excited claw-pole alternator. It also has low-speed characteristics and low excitation loss. And to produce the same magnetic field, the required excitation current is less than that of electrically-excited claw-pole alternator.

关 键 词：混合励磁 永磁 无刷 爪极发电机 三维有限元分析 

分 类 号：TM351[电气工程—电机]