轴向磁通永磁电机气隙磁场端部效应研究  

Investigation of Air-gap Field End-effect in Permanent Magnet Axial-flux Motor

作　　者：周挺[1] 徐昕[1] 孙明灿[1] 兰玉华[2] 

机构地区：[1]沈阳工业大学国家稀土永磁电机工程技术研究中心,沈阳110870 [2]河北电机股份有限公司,石家庄051430

出　　处：《微电机》2016年第3期14-17,共4页Micromotors

基　　金：国家科技支撑计划项目(2013BAE08B00);国家自然科学基金(51307111);辽宁省教育厅科学技术研究项目(L2013049)

摘　　要：轴向磁通电机永磁体尺寸沿径向变化较大,且定子绕组有效长度较短,因此气隙磁场径向端部磁密值的削弱不可忽略。以一台7 k W、4000 r/min表贴式双转子轴向磁通永磁电机为例,采用三维有限元法分析气隙磁场端部效应,并得出结论:气隙长度δ增大至2 mm时对内、外端部磁场影响程度相同;极弧系数αp增大,内端部气隙磁密变化速度先减小后增大,外端部恰相反,αp=0.75时分别达到速度最小值与最大值;外端部气隙磁场随斜极角度呈明显的周期性变化,气隙圆环外径至平均半径之间气隙磁密周期变化范围为[θz,2θz)。In axial-flux motor,the size of permanent magnets varies in a large range,and the effective length of windings in stator,that results in a non-ignorable reduction in air-gap field. In this paper,a 7 k W,4000 r / min PM surface-mounted axial-flux motor with two rotors was analyzed by finite element method（ FEM）. It can be summarized that the air-gap field end-effect of both sides varies in the same degree when the length of air gap rises to 2 mm; As the pole-arc coefficient increases,the change rate of inside-end air-gap flux density decreases first and then increases,while it is just the opposite in outside-end,and reaches the maximum rate and minimum rate respectively at αp= 0. 75; The outside-end air-gap flux density changes with the PM-skewing degree in cycle obviously,and the range of cycle length variation is [θz,2θz） between the outside-end and average radius.

关 键 词：轴向磁通结构 气隙磁密 有限元法 径向端部效应 

分 类 号：TM351[电气工程—电机]