电磁式无刷交流发电机励磁系统自激作用数字仿真分析

本文运用ａｂｃ坐标系统下的交流励磁机数学模型，分别对励磁机带全波和半波两种整流方式下的自激作用进行了理论分析和数字仿真分析，结果表明：一般情况下，桥式整流方式下的自激量比半波方式下的小，但在主发电机励磁绕组电阻ＲＬ较大时，即电抗负载因数较小时却不一定。在ＲＬ和转速ｎ变化时，自激量随其变化，并存在极限值，最后，归纳总结出了在电机设计阶段检查是否可能发生完全自激的方法。

Self-Excitation Effect of Brushless Excitation System

The paper presents the theoretical analysis and digital simulation of the self-ex- citation effect of excitation system in a brushless AC generator at abc coordicate system. It is shown in the result that the self-excitation in half-wave-rectifier is larger than that in full-wave-rectifier unless the reactance-load factor XR very small. The volume of the self-excitation effect varies with excited-winding resistance of the main generator and speed, and there exists a maximum. Finally,a simple way to check for the full-self-excitation phenomena occuring possibly is summerized in the paper.