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V-Belt drive selection question

V-Belt drive selection question

V-Belt drive selection question

Let's assume I have three identical pumps but all operating at three different speeds.  1620 RPM, 1080 RPM and a low one at 360 RPM.  I'm sure I could belt drive the upper two but the lowest one the drive would be odd looking and expensive.

Should I consider going to a 1200 RPM on the lowest speed in order to reduce the size and cost of the drive.

I'm talking a small 5HP motor so the cost difference between the 1800 and 1200.

Is there a rule of thumb for drive sizing where speeds get so low that you have to go to a lower speed motor?  

Rule of thumbs will work for this application anything you could provide would be helpful.


Wayne E. Lovison

RE: V-Belt drive selection question


You could select a 900 rpm motor then the step down on the sheave sizes would not be so bad.

RE: V-Belt drive selection question


As I recall good belt drive design does not allow ratios above 4:1.  You may want check this out with one of the belt/pulley suppliers.

RE: V-Belt drive selection question


Since the are identical, the power required required for the slowest one would be very small.  With the small power requirement, I expect that an greater than normal ratio could still function adequately.  A nominal 1200 rpm motor should work for this.

The 1080 rpm pump driven by a 1200 rpm motor shoukd work very well since the ratio is very modest.

The 1620 rpm pump driven from the 1200 rpm motor could be bit of a concern due to the much greater power consumption and the speed increase involved.

What kind of application is involved?  Is this for some sort of display or demonstration?

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