大容量电机定子线棒端部电场分布计算

摘要大容量电机绝缘系统的要求随着电机容量的持续上升也被不断提高，对绝缘系统提出的新的要求表明，在不增加电机体积的基础上保证电机具有更加优良的电气和机械特性。电机定子线棒端部产生电晕放电的主要原因是其端部电场分布不均匀造成的，而且还会增加定子线棒端部的体积损耗密度，进而导致电子主绝缘系统受到破坏，在一定程度上使定子线棒的运行寿命受到影响。所以，对定子线棒端部电场的分布情况进行计算极为重要。首先，本文利用COMSOL Multiphysics有限元仿真软件搭建了定子线棒的几何模型：其次通过定子线棒的实际工作环境，添加了相关的物理场：其次，在对定子线棒基本模型计算完成后，结合线棒弯曲角度进行了仿真分析，结果表明：定子线棒弯角大小是能够改善线棒整体电场和损耗分布的，但效果不是很明显：最后，为进一步探究线棒电场分布的影响因素，本文有针对线棒端部防晕层厚度以及主绝缘厚度进行了电场分布研究，仿真结果表明：防晕层厚度越大，中阻层电场强度越小，中高阻层的电场强度越大：主绝缘厚度越大，中阻层电场强度越大，定子线棒中轴线上的最大电场强度也越大。关键词：定子线棒：有限元：防晕层：主绝缘AbstractThe requirements for the insulation system of large capacity motors are constantlyincreasing with the continuous increase of motor capacity.The new requirements for theinsulation system indicate that the motor has better electrical and mechanical characteristicswithout increasing the motor volume.The main reason for corona discharge at the end of themotor stator bar is the uneven distribution of the electric field at the end,and it also increases thevolume loss density at the end of the stator bar,leading to damage to the electronic maininsulation system and,to a certain extent,affecting the operating life of the stator bar.Therefore,it is extremely important to calculate the distribution of the electric field at the end of the statorbar.Firstly,the geometric modeling of the stator bar is built by using the COMSOLMultiphysics finite element simulation software;Secondly,relevant physical fields were addedthrough the actual working environment of the stator bar;Secondly,after completing thecalculation of the basic model of the stator bar,simulation analysis was conducted based on thebending angle of the bar.The results showed that the size of the bending angle of the stator barcan improve the overall electric field and loss distribution of the bar,but the effect is not veryobvious;Finally,in order to further explore the influencing factors of the electric fielddistribution of wire rods,this article conducted an electric field distribution study on thethickness of the anti corona layer and the main insulation thickness at the end of the wire rod.The simulation results showed that the larger the thickness of the anti corona layer,the smallerthe electric field intensity of the middle and high resistance layers,and the greater the electricfield intensity of the middle and high resistance layers;The greater the thickness of the maininsulation,the greater the electric field strength of the middle resistance layer,and the maximumelectric field strength on the axis of the stator bar.Keywords:Stator wire rod;Finite element;Anti-corona layer;Main insulation目录第一章绪论…..............1.1课题研究背景和意义12国内外研究现状分析…1.2.1定子线棒防晕结构.11.2.2定子线棒主绝缘.21.3本文的研究内容.3第二章电场的有限元计算理论与方法2.1有限元仿真软件简介.42.2电磁场的有限元法.52.2.1电磁场基本理论和计算方法62.2.2有限元法的基本思路和步骤72.3本章小结8第三章定子线棒端部模型建立….93.1几何模型的创建93.2仿真模块与参数的选择44444444444i444444444423.3网格剖分..123.4边界条件及其他设置133.5本章小结.14第四章定子线棒端部结构仿真分析…154.1定子线棒端部电场分布仿真结果….154.2定子线棒弯角大小对电场分布的影响.…164.3不同防晕层厚度的线棒端部仿真分析…184.4不同主绝缘厚度的线棒端部仿真分析204.5本章小结22第五章结论23参考文献24致谢.ca26