异步电动机在变化负载状态下联合仿真模型的数值计算  

Numerical calculation of the variable-load combined simulation model for induction motor

作　　者：于明星[1] 杨丽[2] YU Mingxing;YANG Li(Department of Information Engineering,Chaoyang Teachers College,Chaoyang 122000,China;School of Equipment Engineering,Shengyang Ligong University,Shengyang 110159,China)

机构地区：[1]朝阳师范高等专科学校信息工程系,辽宁朝阳122000 [2]沈阳理工大学装备工程学院,辽宁沈阳110159

出　　处：《内蒙古科技大学学报》2020年第2期164-170,共7页Journal of Inner Mongolia University of Science and Technology

基　　金：辽宁省自然科学基金指导计划项目资助(201602650).

摘　　要：为研究三相异步电机的电磁特性及运行特性,采用Ansys有限元软件的高计算精度,对感应电动机进行联合仿真.建立7.5 kW鼠笼型三相异步电机的Maxwell有限元模型,将有限元模型导入Ansys Simplorer中,建立电路与磁路联合仿真模型,提出一种定子绕组拆分策略,策略解决了Ansys Simplorer中电压源与定子绕组三角形直接相连错误故障的问题.在电机的输出端设定转动惯量,利用状态机特征模块模拟负载转矩的变化情况.基于磁路和等效电路的计算法,对电机变化负载工况的电流、转矩和转速进行分析和计算.基于磁场的计算法,采用二维瞬态交变磁场求解器分析电机变化负载的瞬态电磁场的变化情况.最后,求出气隙磁密的分布,提取谐波幅值的含量,分析谐波对电机的影响,仿真结果对电机控制策略的研究提供思路借鉴.The Ansys finite element software of high computational accuracy was used to perform joint simulation for asynchronous motors in order to study the electromagnetic characteristics and operation characteristics of induction motors.The Maxwell finite element model of 7.5 kW asynchronous motors was established.The model was imported into simplorer to establish the joint simulation model.The state machine feature module was used to simulate the change situation of load torque.Based on magnetic circuit and equivalent circuit calculation method,the current,torque and rotational speed of motors under idling and varying load working conditions were analyzed and calculated.Based on the calculation method of the magnetic field,two dimensional transient alternating magnetic field solvers were used to analyze the change situation of transient electromagnetic field under idling and varying load conditions.Finally,the distribution of air gap flux density was solved,and the harmonics of air gap flux density was decomposed.The contents of harmonic amplitude were extracted,and the effect of harmonics on motors was analyzed.The simulation results may provide theoretical reference to motor control strategies.

关 键 词：异步电动机 有限元 联合仿真模型 瞬态电磁场 谐波分析 

分 类 号：TM346[电气工程—电机]