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When using a synchronous motor we recommend having 200% starting torque, 120% to 130% pullin torque, and 225% pullout torque. These assume no greater than a 10% voltage drop at the motor terminals. VBELT Ball Mill DRIVE Vbelt or polyV drives are generally used on grinding mills consuming 350 HP or less.

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Sep 21, 2011 · Since the mass of the rotating cylinder with liners and balls is very high, thus the starting torque for the mill is enormously high. The drive motor for the Ball mill ranges fro 0.5 MW to 2.5 MW depending on the hardness of Bauxite, feed size and operating capacity of the mill for meeting the hourly alumina production requirement as described

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