How to Select Frequency Convertors

 

Wu Zhongzhi（Electronic Systems Engineering Design Institute BJZR，Beijing 10 0 0 39，China）

 

Abstract Frequency convertors are widely applied in the driving field. How to appropriately select the frequency convertors is comprehensively analyzed and introduced，including the understanding of the inversion elements of the frequency convertor，topological circuit，the control mode of the frequency convertor on the driving motor and the load-torque characteristic，etc. In the application of frequency convertors，it should be considered that there are harmonics in the input and output current and the relevant matching equipments for harmonic suppression should be selected.

Key words Frequency convertor Power electronic devices Topological circuit Load characteristic Harmonic

 

摘 要 变频器在传动领域应用广泛。对如何正确选用变频器作了全面分析与介绍。包括了解变频器的逆变元件、拓扑电路，变频器对拖动电机的控制方式、负载转矩特性等。在应用变频器时，应考虑变频器的输入输出电流中含有谐波，要选用相应的抑制谐波的配套设备。

关键词 变频器 电力电子器件 拓扑电路 负载特性 谐波