摘要
轴向磁通永磁同步电机的电磁场呈三维分布,其转矩的精确建模和优化通常需要采用三维有限元方法,但这非常耗时。提出一种转矩解析计算模型,并基于该模型对轴向磁通永磁同步电机的转矩展开优化。首先,通过磁通密度比磁导法建立了轴向磁通永磁同步电机气隙磁场解析模型。然后基于麦克斯韦张量理论推导得到电磁转矩和齿槽转矩的解析模型,并通过有限元法验证了该模型的准确性。该模型不仅指出了产生电磁转矩和齿槽转矩的判据,还明晰了转矩波动各阶成分与气隙磁通密度谐波之间的关系。最后利用该解析模型,采用径向变极弧系数法对一台单定子单转子轴向磁通永磁同步电机的转矩展开优化,结果表明径向变极弧系数法可有效削弱轴向磁通永磁同步电机的齿槽转矩和电磁转矩波动,而基于解析模型的优化则具有非常高的效率。
Axial flux permanent magnet synchronous motors（ AFPMSM） have an intrinsic 3-D electromagnetic structure. Its accurate modeling and optimization of torque usually require the use of 3-D finite element analysis（ FEA）,which is highly time consuming. This paper presents a new torque analytical model and then it was used to optimize the torque of an AFPMSM. Firstly, the analytical model of magnetic field was established by using magnetic potential and relative permeance. Then,electromagnetic torque and cogging torque analytical models were derived based on Maxwell-tensor method. Finally,3-D FEA was presented for verifying the accuracy of the proposed model. The analytical model indicates the criterion to produce electromagnetic torque and cogging torque. It also clears the relationship between the order components of torque and the harmonic field. Based on the analytical model,the torque of a virtual AFPMSM with one stator and one rotor was optimized by triangular skew method. The result shows that the triangular skew method can greatly decrease the cogging torque and electromagnetic torque ripple,and the analytical method is really high efficient.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第23期46-53,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(51375343)
国家重大科学仪器开发专项(2012YQ150256)资助
关键词
轴向磁通永磁同步电机
转矩
解析模型
转矩优化
Axial flux permanent magnet synchronous machines
torque
analytical model
torque optimization
