调速范围，是衡量系统变速能力的指标。
本文对该类机构的调速范围和循环功率的问题作了分析和探讨。
The problems of speed regulation range and the circulatory power are analysed in this paper.
实践表明，该系统具有动态响应快、调速范围广、可靠性高等特点。
The practice shows that The system has very quick dynamic response, wide speed regulating scope and high reliability.
但步进电机的效率低，拖动负载的能力不大，脉冲当量不能太大，调速范围不大。
But the step motor efficiency is low, the ability is not big, load drag pulse equivalent cannot too big, speed range is not big.
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