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论述了交流提升机双馈凋速系统组成、工作原理，说明ＪＣ４Ａ－６３０／４００Ａ型双馈串级调速装置的特点、主要性能，并在改造斜井提升机调速系统时获得了满意效果。
The composition and working principle of doubly-fed and speed-up system of AC hoist are discussed. The characteristics and main performances of JC4A-630 / 400A doubly-fed cascade speed governor are illustrated. Satisfactory results are achieved when the speed governing system of inclined hoist is modified. .