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## starting torque of ball mill calculation

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## starting torque of ball mill calculation - houtenclarabe

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When using a synchronous motor we recommend having 200% starting torque, 120% to 130% pull-in torque, and 225% pull-out torque These assume no greater than a 10% voltage drop at the motor terminals V-BELT Ball Mill DRIVE V-belt or poly-V drives are generally used on grinding mills consuming 350 HP or less

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The starting torque characteristic of this type of ball mill is not linear Figure 2 shows the graph of mill speed versus torque requirement: Figure 2 The graph clearly shows that the torque requirement exceeds 120% at 80% speed This is why the starting torque of the drive motor should be at least 130% of full load torque

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the mill supplier Ball mill torque curve:- Cascading point is at 60°, independent of speed Figure 2 The torque speed characteristic curve for a recent ball mill is shown in Figure 2 Mill suppliers define the starting torque at an angular displacement of the charge The cascading point of this mill is at angle of 60° This implies that a

## starting torque of ball mill calculation

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mands of high torque - direct drive systems and drive systems using standard torque motors with Airflex clutches which replaced them Because of the large thermal loads associated with mill start-up, the use of VC clutches are recommended Clutch Selection The required clutch torque is calculated from the power rating of the mill motor, clutch

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