Ventilation systems for civil and commercial buildings
Underground space ventilation system
Plant building ventilation/explosion proof ventilation system
Industrial centrifugal fan unit equipment
Environmental dust removal exhaust gas treatment system
The wind moves freely by me
三相异步电动机转速公式为：n=60f/p(1-s) 从上式可见，改变供电频率f、电动机的极对数p及转差率s均可太到改变转速的目的。
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