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According to the preceding analysis mill speed lifter height and lifter number significantly affect the particle behaviour torque and power of a ball mill. The comprehensive effect of mill speed lifter height and lifter number on the torque and power of a ball mill is discussed using DEM in the following section.

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Dec 03 2008 · AC motors driven by VFD s tend to be constant torque devices. That s the typical mill spindle motor. A constant torque motor will develop horsepower in direct proportion to rpm. So if you have a mill that s rated 20hp at 8000 rpm it ll have 10 hp at 4000 rpm or more significantly about as much horsepower as a sewing machine motor at 100 rpm.

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Motor selection can become still more complex when loads do not exhibit a single speed-torque curve or for which torque at full speed varies throughout each revolution. One example is the large ball mill used in minerals processing.

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