供应

西门子变频器6SY7010-0AB51      6SY7010-0AB52 

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。 [1] 
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。

主电路
变频功率分析仪
变频功率分析仪(5张)
主电路是给异步电动机提供调压调频电源的电力变换部分，变频器的主电路大体上可分为两类：电压型是将电压源的直流变换为交流的变频器，直流回路的滤波是电容。电流型是将电流源的直流变换为交流的变频器，其直流回路滤波是电感。它由三部分构成，将工频电源变换为直流功率的“整流器”，吸收在变流器和逆变器产生的电压脉动的“平波回路”，以及将直流功率变换为交流功率的“逆变器“。 [4] 
整流器
大量使用的是二极管的变流器，它把工频电源变换为直流电源。也可用两组晶体管变流器构成可逆变流器，由于其功率方向可逆，可以进行再生运转。 [4] 
平波回路
在整流器整流后的直流电压中，含有电源6倍频率的脉动电压，此外逆变器产生的脉动电流也使直流电压变动。为了抑制电压波动，采用电感和电容吸收脉动电压（电流）。装置容量小时，如果电源和主电路构成器件有余量，可以省去电感采用简单的平波回路。 [4] 
逆变器
同整流器相反，逆变器是将直流功率变换为所要求频率的交流功率，以所确定的时间使6个开关器件导通、关断就可以得到3相交流输出。以电压型pwm逆变器为例示出开关时间和电压波形。

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 NATIONAL INSTRUMENTS CFP-CB-1 P/N 188989D-01 (HC62) 
 National Instruments cFP-CB-3 Connector Compact FieldPoint 188989D-01 (BM7)
 National Instruments cFP-CB-3 Connector Compact FieldPoint 188989D-01 (BM7) 
 NATIONAL INSTRUMENTS cFP-CB-3 INTEGRATED CONNECTOR BLOCK P/N 1889998B-01 (K14)
 NATIONAL INSTRUMENTS cFP-CB-3 INTEGRATED CONNECTOR BLOCK P/N 1889998B-01 (K14) 
 National Instruments FieldPoint FP-DO-400 8-Ch Universal Discrete OUTPUT (19S)
 National Instruments FieldPoint FP-DO-400 8-Ch Universal Discrete OUTPUT (19S) 

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