The changes in variable speed drive technology for electrified railways are summarized.

概述电气化铁路用可变速传动技术的变迁.

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The performance of AC variable speed drive system has been improved greatlyfield - oriented control is applied.

矢量控制使交流调速系统的性能产生了质的飞跃.

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Individual infinite variable speed drive of each roll with AC - motors coupled to programmable frequency inverters.

电机驱动方式为交流变频无极变速驱动.

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The papers study the technology of variable speed drive in electric submergible pump.

本文主要论述了潜油电泵系统变频调速的应用技术.

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