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HP Motor Size Requirements
Q: If I currently have a mixer that has a one hp motor inputting 3300 rpm to a gear reducer to obtain 800 RPM output, then if I was to remove the motor and reducer to put a VFD driven 1750 motor direct drive to my mixer what size HP motor would be required. If you know please can you also provide the formula.
A: The motor size question does not require a formula, you simply need the same horsepower motor. The speed-reduction drive is a constant horsepower device: horsepower "in" equals horsepower "out," minus some small losses of typically 2% to 5%. To drive your mixer at the same speed, 800 rpm, with the same torque, you need the same power. Under normal conditions, an equal-size electric motor designed for use with a VFD, should deliver the amount of power your mixer needs.
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