表贴式轴向磁通电机梯形削极分段结构研究  

Trapezoidal shaping segmented structure of surface mountaxial flux permanent magnet motor

作　　者：武岳 张志锋[1] 张冉 WU Yue;ZHANG Zhifeng;ZHANG Ran(School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China;Beijing Institute of Space Launch Technology,Beijing 100076,China)

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870 [2]北京航天发射技术研究所,北京100076

出　　处：《电机与控制学报》2024年第3期84-95,共12页Electric Machines and Control

基　　金：国家自然科学基金面上项目(51877139);辽宁省教育厅科学研究经费项目(面上项目)(LJKZ0128)。

摘　　要：采用多极少槽结构和分数槽集中绕组可有效提高轴向磁通永磁(AFPM)电机的转矩密度,但磁动势谐波含量较大、频率较高,会引起永磁体涡流损耗增大和温度升高。通过优化表贴式轴向磁通永磁电机的永磁体结构可有效降低永磁体涡流损耗并抑制转矩波动,因此提出梯形削极分段结构。首先,基于精确子域法分别建立不同永磁体结构的解析模型。其次,通过解析模型和三维有限元模型对不同永磁体结构的气隙磁密、输出转矩和涡流损耗进行分析对比。然后,通过研究永磁体分段对永磁体涡流损耗的影响,确定梯形削极分段结构的参数。最后,制造一台样机并进行实验,实验结果证明,梯形削极分段结构可有效降低永磁体涡流损耗并且改善轴向磁通永磁电机输出性能。The torque density of axial flux permanent magnet(AFPM)motor can be improved effectively by adopting multi-pole and few-slot structure,and fractional slot concentrated winding,but the large harmonic content of magnetomotive force and the high frequency will lead to the increase of permanent magnet eddy current loss and temperature rise.By optimizing the permanent magnet structure of the surface mount AFPM motor,the permanent magnet eddy current loss can be effectively reduced and the torque ripple can be suppressed.Therefore,the trapezoidal shaping segmented permanent magnet structure was proposed.Firstly,the analytical models of different permanent magnet structures were established based on the precise subdomain method.Secondly,the air gap magnetic flux density,output torque and eddy current loss of different permanent magnet structures were analyzed and compared by analytical model and three-dimensional finite element model.Then,the structure parameters of trapezoidal shaping segmented permanent magnet structure were determined by studying the effect of permanent magnet segmented on eddy current loss.Finally,a prototype was manufactured and tested.The experimental results prove that the trapezoidal shaping segmented permanent magnet structure can effectively reduce the permanent magnet eddy current loss and improve the output performance of the AFPM motor.

关 键 词：轴向磁通永磁电机 梯形削极分段结构 永磁体结构 永磁体涡流损耗 转矩密度 精确子域法 

分 类 号：TM351[电气工程—电机]