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Industrial fan motor RPM specification is not always as straightforward as it may seem. It depends on a few key factors. Choose wisely.

How do you determine the right fan motor RPM for your industrial centrifugal fan application? You’ll need to know what kind of drive you’re using, the specified horsepower, and one more factor that frequently gets missed. In this 2-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 [ Ссылка ].

Read Full Transcript:

When considering the motor RPM for your application, we’re going to first talk about direct drive fans, because in this case, the speed of your motor is critical. Say your application calls for a 3600 RPM. You must select a 3600 RPM motor.

So, behind me, I’ve got some 40 horsepower motors, a 30 horsepower motor, a 20 horsepower motor, and they’re various speeds between 1800 and 3600 RPM. So, in a direct-driven fan, whatever your fan speed calls for, you must match with your motor speed.

Now, this is important to consider for applications where you have a different frequency. In the US, for example, most of us are on 60Hz frequencies. That calls for synchronous motor speeds of 3600 RPM, 1800 RPM, 1200 RPM, 900 RPM and so on.

Abroad, where you may have 50Hz frequencies, you need to check the voltage and frequency combination in the country where your fan is going to. Frequently, you’ll run into 50Hz frequencies. Well on a 50Hz frequency, the synchronous motor speeds are 3000 RPM, 1500 RPM, 1000 RPM, and so on.

And so if you neglect to consider that when you’re selecting your fan, you could pick something that’s at a 60Hz frequency where your application is actually at a 50Hz frequency, so that’s an important thing to consider.

As we look at belt-driven applications, it really falls within, how close is your motor speed to your fan speed? So, let’s say you’ve got an application that’s about 2300 RPM. You want to pick an 1800 RPM motor to drive that. In most cases, you want to pick as slow a motor speed as possible for belt-driven applications that’s somewhat close to the fan’s operating speed. This extends the life of your motor, and it more matches the application that you’re trying to match.


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