The using of the automatic optimization and frequency variable technology can realize efficiency in circulated water of the power plant.

利用自动优化控制和变频调速技术实现火电厂循环水泵安全节能高效控制。

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This paper introduces a frequency variable control system for elevator driven by linear induction motor, and this elevator has been tested.

设计了一套圆筒形直线感应电动机驱动的电梯全数字变频控制系统，对其进行了试验。

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This paper introduces a frequency variable and velocity variable system using IPM. Some problems which should be noticed in applications are presented.

介绍一种应用智能功率模块的变频调速系统，提出了使用智能功率模块时应注意的关问题。

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For example, rather than purchase expensive ultra-efficient motors, low cost opportunistic additions to old fans and pumps such as variable frequency drives and demand controls can deliver equal energy savings at a fraction of the cost.

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