Electromechanical Dynamic Behaviour and StartUp ...

According to Figure 1, the dynamic model of the ball mill is where is the rotation resistance coefficient of the drive motor, is the friction torque, and the rotation direction of the ball mill is determined by the sign function sign().. When the rotational speeds of the clutch are synchronised,, =, the clutch no longer slips. The dynamic model can be written as follows:

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Curve 1 is power characteristic. Curve 2 is power output characteristic. Curve 3 is audio frequency characteristic under power frequency. ... the ball mill belongs to the constant torque load, its speed regulation efficiency is equal to speed regulation ratio that a large

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Aug 01, 2001· The power, which is given by the product of this torque curve with the mill speed, has a much rounder peak centered on N= before dropping sharply for higher rotation rates. For a mill operating at a typical 80% of critical, the power predicted by the model is 3×10 5 W/m of mill length. For a typical 7mlong mill, the power required is ...

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The problem with ball mills vs a simulation like ETAP is that the mill initially is a torque load that is dependent on rotation angle until the charge start to tumble. ETAP only simulates the torque vs speed as a curve. Best bet would be to use a torque peak right off zero speed and then drop down to a more constant torque type of load curve.

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Effect of lifters and mill speed on particle behaviour ...

May 01, 2017· Meanwhile, the torque is roughly inversely proportional to the lifter height when ψ = 100 % (except for the curves of the torque corresponding to H l = 0 mm and H l = 3 mm in Fig. 19d) because the particle area ratio becomes the decisive factor when a ball mill rotates at a high speed. The particle area ratio is high when the lifter height is ...