14.09.2020
Which frequencies are harmful for fan installations and what is fan’s minimum operating frequency?
Test case fan is equipped with 3HS20 InfiniSpring®-springs and with a 2.2 kW electric motor, which is controlled via variable-frequency drive. Motor nominal speed is 1440 rpm. This article focuses on testing the fan with big unbalance to see which rigid body modes are harmful for the fan installation.
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