Sorry, its been too long since I was with Century Electric Motor Company (very first EE job out of school) and I done forgot about motors grrrrrrrrrr. However, I can tell you HP is a function of Torque X RPM so if RPM drops that much, and I doubt torque will rise the same degree, you cant achieve the same HP (unless Torque went up as much as RPM went down) and its my best guess the efficieny will be reduced and more heat losses.
Id say there would be less losses and it would be more efficient to use pulley reduction versus that much frequency variation, but Im NOT a mechanical engineer.........
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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