基于有限元法的无刷交流励磁机空载特性分析及额定励磁电流计算  

No-Load Characteristics Analysis and Rated Excitation Current Calculation of Brushless AC Exciter Based on Finite Element Method

作　　者：姚维康 徐余法[1] 黄厚佳 闫鑫洋 YAO Weikang;XU Yufa;HUANG Houjia;YAN Xinyang(College of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电机学院电气学院

出　　处：《电机与控制应用》2019年第3期58-63,共6页Electric machines & control application

基　　金：上海发电机厂核心技术重点研究项目(T-130717001.02)

摘　　要：针对无刷交流励磁机铁心结构的复杂性和铁磁材料饱和特性的影响,采用非线性有限元法,利用有限元软件Maxwell,建立无刷交流励磁机的二维模型,对空载特性及额定励磁电流进行研究分析。以1台28kW无刷交流励磁机为例,对电机气隙磁场仿真分析并求取空载特性。计算所得的基波电势与实测结果相符,为此类电机电磁场的设计提供理论依据。在此基础上通过场路耦合的方法,用外电路来模拟额定负载工况,计算出额定工况下的励磁电流。该方法具有实用性,可为一般的交流励磁机励磁电流计算提供参考。In view of the complexity of the core structure of the brushless AC exciter and the influence of saturation characteristics of the ferromagnetic material,the finite element software Maxwell was used to create a two-dimensional model of the brushless AC exciter for the research and analysis of no-load characteristics and rated excitation current.Taking a 28 kW brushless AC exciter as an example,the simulation analysis of the air gap magnetic field of the motor and the calculation of the no-load characteristics were carried out.The calculated fundamental wave potential was consistent with the measured results,and a theoretical basis for the design of the electromagnetic field of this type of motor was provided.Based on this,through field-circuit coupling method,the external circuit was used to simulate the rated load condition,and the excitation current under rated condition was calculated.This method had practicality and could provided reference for the calculation of the general AC exciter excitation current.

关 键 词：无刷交流励磁机 有限元法 空载特性 励磁电流 

分 类 号：TM34[电气工程—电机]