·变频器（Variable-frequency Drive，VFD）是应用变频技术与微电子技术，通过改变电机工作电源频率方式来控制交流电动机的电力控制设备。
变频器主要由整流（交流变直流）、滤波、逆变（直流变交流）、制动单元、驱动单元、检测单元微处理单元等组成。
变频器靠内部IGBT的开断来调整输出电源的电压和频率，根据电机的实际需要来提供其所需要的电源电压，进而达到节能、调速的目的，
另外，变频器还有很多的保护功能，如过流、过压、过载保护等等。
随着工业自动化程度的不断提高，变频器也得到了非常广泛的应用。·
·Allen-Bradley PowerFlex系列变频器提供广泛的控制模式，几乎能满足任何电动机控制需要。
通过功能、选项和包装组合实现应用通用性，帮助满足安全要求、编程以及配置的方便，PowerFlex系列拥有一种能够满足您的应用需求的解决方案。·
·Allen-Bradley PowerFlex系列变频器的设计目的就是为您提供覆盖所有电压以及广泛额定功率的完整产品组合，带来一种开箱即用和集成。·
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·Allen-Bradley PowerFlex 4系列变频器为设备级别、单独控制应用或简单的系统集成提供一种简单的解决方案。
这种通用的变频器种类设计目的即为了使用方便，提供一种紧凑包装以优化面板空间和应用的通用性。·
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