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WhatsApp: +86 18838072829A motor with around 1400 Horse Power is calculated needed for the designed task. Now we much select a Ball Mill that will draw this power. The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The following shows how ...
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WhatsApp: +86 18838072829ball mill motor starting curves BINQ Mining "EXPERIENCE WITH SYNCHRONOUS AND Cimentec Ltd. Ball mill and motor 3 Ball . theoretically cannot self start. Figure 4 Torque speed curves of a 4100 hp .
WhatsApp: +86 18838072829The grinding process of the ball mill is an essential operation in metallurgical concentration plants. Generally, the model of the process is established as a multivariable system characterized with strong coupling and time delay. In previous research, a twoinputtwooutput model was applied to describe the system, in which some key indicators of the process were ignored. To this end, a three ...
WhatsApp: +86 18838072829The energy consumption of the total grinding plant can be reduced by 2030 % for cement clinker and 3040 % for other raw materials. The overall grinding circuit efficiency and stability are improved. The maintenance cost of the ball mill is reduced as the lifetime of grinding media and partition grates is extended.
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WhatsApp: +86 18838072829and the starting duty (starting time and starts per hour) specified by the user. The ratings given to M350 starters are therefore variable and application dependant. 5 starter model nominal motor kW rating at starting torque of; single motor drives x flT x flT x flT x flT m350/2 500 355 250 185 m350/3 750 650 450 315
WhatsApp: +86 18838072829Two indexes are proposed for evaluation. Finally, a 4500 kW ball mill is used to analyse the startup process with different operation parameters of the air clutch. The effect of the engagement ...
WhatsApp: +86 18838072829Liquid starter with servomotor operated electrodes available for applications that requires a fast response in changing resistance to avoid motor stalling., shredder motors for metalrecycling plants. Air cooled or watercooled heat exchanges can be added for application that requires continuous cycling of start/stop or speed control.
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WhatsApp: +86 18838072829ball mills, the starting torque restrictions of some . by meter long ball mill with a 5000 HP drive motor. . of mill speed versus torque . ball mill torque curve 80100TPH Stone Crushing Production line
WhatsApp: +86 18838072829Often used in large Mills in the cement and mining industry, these motors were driven by LCI variablefrequency drives (VFDs) or used with direct start with a clutch system that would...
WhatsApp: +86 18838072829Figure 1: Torquespeed curve for asynchronous motors. The starting torque is the torque generated from the initial current inrush, which is always higher than the rated torque. The pullout torque is the maximum torque reached before steadystate, and the rated torque is what is provided once the motor is at speed.
WhatsApp: +86 18838072829The use of VSDs makes it very easy to set the mill speed by just modifying this value on a touchscreen. But this is not only an option for new installations. In installations where SAG and Ball mills have been working for several years at fixed speed, but the speed regulation has been observed to be necessary VSDs can also be integrated very ...
WhatsApp: +86 18838072829Motor Starting Oneline Figure 1b. Speed Torque/Current Profile for DOL Starting 0 RPM Torque AC Utility Line Amps Standard Motor (600650%) Low Inrush Current Motor (300450%) Motor Full Load Current (FLA) Full Voltage Start Torque Direct on Line. Solid State Reduced Voltage (SSRV) Starter
WhatsApp: +86 18838072829ETAP 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. The initial torque to start rotation will most likely be over or rated torque. How much depends on the design of the mill.
WhatsApp: +86 18838072829Benshaw's Solution. Working with a long time customer and local Benshaw partner in the motor controls industry, Benshaw has successfully applied a 480VAC 700 HP AC variable frequency drive for positioning a medium voltage synchronous motor driven ball mill. The variable frequency drive powers the 4160Volt 3500HP synchronous ball mill ...
WhatsApp: +86 18838072829Figure 3 shows a measuring the power quality of the network during ball mill typical motor torque speed curve. starting. This has allowed network data to be gathered to check the operation of the mill secondary starter and as such is made available for reference in this paper.
WhatsApp: +86 18838072829Synchronous motor. Miniature synchronous motor used in analog clocks. The rotor is made of permanent magnet. Small synchronous motor with integral stepdown gear from a microwave oven. A synchronous electric motor is an AC electric motor in which, at steady state, [1] the rotation of the shaft is synchronized with the frequency of the supply ...
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WhatsApp: +86 18838072829The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than meters (10 feet) diameter inside liners, the top size of the balls used affects the power drawn by the mill. This is called the ball size factor S.
WhatsApp: +86 18838072829If shown separately, the "cold" curve provides the safe locked rotor times for the motor when it is first started (the "cold" condition), while the "hot" curve provides the safe stall times after a motor has either been recently started or run under load.
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WhatsApp: +86 18838072829Thus the power to drive the whole mill. = + = = 86 kW. From the published data, the measured power to the motor terminals is 103 kW, and so the power demand of 86 kW by the mill leads to a combined efficiency of motor and transmission of 83%, which is reasonable.
WhatsApp: +86 18838072829The dotted line, labeled (5), is the speedtorque curve for a loaded ball mill. The complete curve falls within the operating area of the motor. The dash line, labeled (6), is the speedtorque curve for a loaded rolling mill. Here you see that the requiting torque falls beyond the capacity of this motor.
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WhatsApp: +86 18838072829The details of the ball mill motor are as follows. Power = kW or HP and the speed is 343 rpm. Load calculations (prior to failure analysis) The ball mill can experience failure based on the maximum normal stress theory as the working loads acting in the ball mill is concentrated across the seam of the mill periphery.
WhatsApp: +86 18838072829Using the Benshaw Low Voltage Drive for positioning a MV synchronous motor driven ball mill is another great solution. The Benshaw variable frequency drive powers the 4160v synchronous ball mill motor during positioning to smoothly rotate the ball mill, providing full torque at zero speed to start and rotate the mill during the positioning process.
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