无刷双馈电机是一种用于拖动风机、泵类负载节能调速最有效的新型电机之一，有着很好的发展前景。
Brushless Double-fed motor (BDFM) is a kind of new motors suitable for the drives of pumps fans, and has a bright future.
泵、风机类负载通常采用鼠笼式异步电动机拖动，恒速运行。
Pump, air pump and so on generally is pulling by squirrel - cage motor, moving in constant velocity.
采用模块化安装，易于扩展和维修，并具有冗余功能。现已广泛应用于风机、泵类负载调速场合，取得很好的节能效果。
So the cascade multilevel inverters have been used in many industrial application fields such as fan or pump and the good saving-energy effect has been gotten.
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