This characteristic proves that DEM is a good method for predicting the torque of ball mills. When the mill speed is raised, the torque increases until it reaches the peak point of the curve at the rotation rate between 70% and 75%; it gradually decreases when ψ ⩾ 75 %.

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Get PriceBALL MILL DRIVE MOTOR CHOICES artec-machine. 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.

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Get PriceThe graph above shows a torque/speed curve of a typical D.C. motor. Note that torque is inversely proportioal to the speed of the output shaft. In other words, there is a tradeoff between how much torque a motor delivers, and how fast the output shaft spins. Motor characteristics are frequently given as two points on this graph:

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Get PriceThe 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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