双层实心异步磁力联轴器的涡流和传动特性分析  

Analysis of the eddy current and transmission characteristics in asynchronous magnetic coupling with double-layer solid rotor

作　　者：杨超君[1] 周曰华[1] 王晶晶[1] 

机构地区：[1]江苏大学机械工程学院,镇江212013

出　　处：《农业工程学报》2013年第4期55-62,I0003,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51075189)

摘　　要：为了解双层实心异步磁力联轴器负载运行时的状态,该文采用有限元软件对其进行瞬态分析,得出了磁力联轴器在负载下的涡流分布情况以及扭矩传动特性,分析表明:铜层上涡流呈现涡旋状分布,涡流的回路数可以按磁极数等分为14个回路;内转子上沿径向由轴孔到铜层外边界,涡流密度先是基本不变,然后逐渐增高,在铜层外表面达到最大,从而验证了涡流的集肤效应;沿铜层周向涡流呈周期性变化,周期数为永磁体的磁极对数,且以1对磁极为1个变化周期。然后研究了不同参数对异步磁力联轴器特性的影响,得到了初步的优化设计方案。永磁体的厚度可以选择9～11mm,永磁体磁极对数选择8对极;铜层厚度可在2～5mm范围内选择,铜层轴向长度与永磁体轴向长度之比在1.025～1.1范围内选择较为合适。最后,通过试验得出扭矩随转差率和输入转速的增加而增加,验证了模拟分析结论的正确性,为大功率下的磁力联轴器结构尺寸的选取提供依据。In order to know the loading condition of double-layer solid rotor asynchronous magnetic coupling, finite element software were used to conduct a transient analysis of the distributions of air gap flux density, eddy current and torque transmission. The results showed that the eddy current presents vortex distribution on the copper layer and that the circuits are divided into 14 by pole pairs. Changing from axle hole to the boundary of the copper layer on the radial direction of the inner rotor, the eddy current distribution is basically constant at the beginning, and then increases gradually. Moreover, the highest eddy current density is in the boundary of the copper layer so that the skin effect of the current is verified. On the circumferential direction of the copper layer, the eddy current periodically changes poles in a cycle, and the number of periods equals the number of permanent magnet pairs of poles. The primary optimal design project was obtained by researching the effect of the asynchronous magnetic coupling characteristics on the different parameters. The eddy current density and torque increased firstly, and then decreased gradually with the increasing thickness of the permanent magnet. The eddy current density and torque achieves maximum simultaneously when the thickness of the permanent magnet is 10 ram. The torque increases firstly, then decreases and the eddy current decreases gradually with the increasing number of pole pairs. When the number of pole pairs is 8, the torque achieves maximum. In order to improve the utilization rate of the permanent magnet and save cost, the thickness of the permanent magnet should be from 9 mm to 11 mm and the number of pole pairs should be 8. The eddy current density and torque decrease gradually with the increasing thickness of the air gap. When magnetic coupling installed, the thickness of the air gap can be from 1 mm to 5 mm. The torque increases firstly, and then decreases gradually with the increasing thickness of the copper layer. The torque achieves maxi

关 键 词：动力传输 联轴器 有限元方法 双层实心异步磁力联轴器 涡流 传动特性 

分 类 号：TH317[机械工程—机械制造及自动化]