How to Size Your Fan Motor

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How to Size Your Fan Motor
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When it’s time to select your fan motor, size does matter. Too big and you lose efficiency; too small and you lose functionality. How do you know what’s just right?

Just two factors determine the right size motor to specify: the type of drive in your application, and the brake horsepower (BHP) specified by the fan manufacturer. In this 1½-minute video, Senior Application Engineer Chet White explains how to make the call.

Looking for more information about industrial fan motors or other components? Contact fans@airprofan.com or visit: https://airprofan.com/

Read Full Transcript:

So when you select a fan, you get a brake horsepower from your fan manufacturer. This indicates how much horsepower you need in the motor that you select to drive your fan. So behind me, we’ve got a few motors. There are some 100 horsepower motors over there, some 25 horse motors behind us, and 400 horsepower motors over here.

So why were they selected at the horsepower they were selected at? In a direct-driven application, your motor is directly in line with either a fan shaft that’s rotating the wheel or the motor itself acts as the shaft for the fan wheel to sit on. In that application, there’s no drive loss from your brake horsepower to your motor. So in that case, whatever your brake horsepower is, you need at least that much horsepower in your motor to overcome the power needed to drive your fan. In a belt-driven application, you get a bit of a loss in the v-belt drive.

So a v-belt drive typically has about a 3-6% drive loss, so if your application calls for a certain brake horsepower at the wheel, you need to add about 3% for a higher horsepower application up to 6% for a lower horsepower application. You need to add that into your brake horsepower in order to properly size your motor to overcome that load.

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