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在用于矿井提升的发电机—电动机系统中，存在着由于发电机励磁饱和非线性变化引起的自持振荡；这种自振现象必须控制在允许范围内，否则将留下安全隐患。本文论述了有给定、有恒定负载情况下的自持振荡，得出了其振幅值随给定和负载的增大而减小的结论，最后使其达到恰好克服静摩擦力的最佳状态。
In the generator-motor system for mine hoisting, there is self-sustained oscillation due to the non-linear variation of generator excitation saturation. The phenomenon of self-oscillation must be controlled within the allowable range, otherwise it will cause potential safety hazard. This paper discusses the self-sustaining oscillations with given load and constant load, and concludes that the amplitude of the self-sustaining oscillators decreases with the given load and the load increases. Finally, it reaches the optimal condition that overcome the static friction.