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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