本文论述了宽调速比直流电动机无火花换向区曲线分散的基本原因，并给出工程控制措施。
The paper introduces the basic cause of the sparkless space dispersion for DC motor with the wide adjustable speed ratio, and gives the control methods of projects.
实验结果表明，系统调速范围宽，控制性能好。
Experiment results indicate that control system have wide range of speed regulation, good dynamic and static behavior.
试验证明，MRCVT调速具有控制简单，控制功率小，调节范围宽，调速平稳等一系列特点。
It shows that the MRCVT has a series of merits: easy to control, low control power, wide range of regulation, and stable speed regulation, etc.
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