并励直流发电机外特性方程的推导及其应用分析

The Derivation and Application Analysis of Selfshunt Excitation DC Generators′ Exterior Characteristic Equation

利用磁化曲线和直流电机的基本知识,推导出了并励直流发电机的外特性方程,并利用此方程定性分析了外特性曲线的拐弯现象。又定义了电流调整率的概念,并引入电机磁化曲线的数学模型求解电流调整率和外特性曲线拐点坐标的解析表达式。利用电流调整率和拐点坐标分析了电机的恒压性能和带负载能力,得到了电机的恒压性能和带负载能力跟电机各结构参数和励磁电阻的关系。

The exterior characteristic equation of selfshunt DC excitation generators was deduced with the basic knowl-edge of the magnetization curve and the direct current generator. And the curve phenomenon of exterior characteristic curves was qualitatively analyzed with it. The concept of current regulation factor was defined and the analytic expression of the current regulation factor and the turning points＇coordinate of the exterior characteristic curve by use of the mathematic model of magnetization curves were given. By use of the current regulation factor and the turning points＇ coordinate, the generators＇ constant voltage capability and load capacity were analyzed and the relationship between them and all structural parameters of the generator and the excitation resistance were got.