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a knowledge of the mill internal dynamics is required both for the design of the mill and behaviour of the gearless drive. from geometry and known weight of charge and a knowledge of the bearing friction. the load torque curve for various angles can be established. the gearless motor can then be sized to the torque requirements.
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trona crush ball mill torque speed curve crusher mills . get price. new. ball mill motor torque calculations - educationcare.in. ball mill drive motor choices - artec machine systems. the time has come to re-think our approach to mill drive motors because of the growth in size of newer ball mills, the starting torque restrictions of some of the
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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several types of ball mill drives can be furnished, made up of various combinations of gearing, motors and transmission equipment. the correct combination to be selected takes into consideration power requirements, gear ratings, floor space, interference from other plant equipment and motor characteristics. the main types are described and illustrated on these pages.
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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.
ball mill torque curve:- cascading point is at 60 , independent of speed. ball mill speed,mill speed influence,grinding efficiency for ball mill speed, influence of mill by multiplying the torque on the driving shaft slope is not affected by the mill speed as the curves are mostly
the torque speed characteristic of a typical ball mill is shown in figure 1. on this curve there are three distinctive points of interest, which uniquely characterize the ball mill operation. figure 1 a the breakaway from rest is identified as the region on the graph requiring 40% to 70% of nominal torque from rest to approximately 20% speed.
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