Variable Frequency Drives and Mining Applications Western Mining Electrical Association Conference November 15 Tailing pumps Rod mill SAG mills Ball mill Mine ventilation fans Conveyor Rock crusher SO 2 compressor Grinding mills Kiln drive De scale pumps Roller Press Drive creates no motor voltage insulation stressbase are up to 40ft in diameter and ball mills are up to 26ft in diameter The measured gross power draws Design Data this covers mill dimensions speed of rotation whether the mill has cone ends and type of be motor input power less various estimates for motor drive
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What type of motor for a ball mill posted in Tools and Tooling Hello I am looking to get into pyrotechnics and I was just wondering what type of motor I should get for my ball mill What rpm for direct drive Also would I be able to wire the motor directly to my mains 230v AC I prefer to make things myself when possible its more fun that way so I was going to make a ball mill to make •Vibration data was first collected from both 1A 1B Ball Mill Drives under normal load route vibration data •Additional vibration data was collected from the motor gearbox of the 1A Ball Mill Drive under no load •To determine what problems if any existed with the drive a
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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 pagEquation 1 is multiplied by the factor of 108 A multi compartment ball mill consists of two or more grate discharge ball mills in seri The same equation is used to calculate the power that each ball mill compartment should draw The total power is the sum of the
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HeidelbergCement AG Germany Up to date cement mills ficient Simotic motors with Premium Efficiency” The decision was made ball mill with a diameter of 44 m and then transported upward with a bucket design of the new motor series com pared to the drives that had been used previously For one thing the motors Jun 05 32 Our variable speed mill drives offer optimized solutions for grinding applications such as AG SAG and ball mills These drive systems are based on ABB s ACS drives
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Ball Mill Design/Power Calculation The ball mill motor power requirement calculated above as HP is the power that must be applied at the mill drive in order to grind the tonnage of feed Ball Mill Design/Power Calculation motor power to drive ball mill To match a ball mill size and its motor size some math is required The power requirement calculated above is the motor power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution
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Every mining operation has a unique grinding process has experience of over 8 000 grinding mills globally including manufacturing and delivering the largest SAG/AG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start up operation and optimization of your millHeidelbergCement AG Germany Up to date cement mills ficient Simotic motors with Premium Efficiency” The decision was made ball mill with a diameter of 44 m and then transported upward with a bucket design of the new motor series com pared to the drives that had been used previously For one thing the motors
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The mill used for this comparison is a 44 meter diameter by 136 meter long ball mill with a HP drive motor It is designed for approximately 90 ston per hour This type two compartment mill is a state of the art shell supported cement finish mill The torque and time requirements of the mill with the ballRing geared mill drives ABB’s ring geared mill drive RMD solu tions correspond to the latest tech nology and are designed for reliable long life and low maintenance operation Our many years of experience in grinding and mill drive system design enable us to adapt our solutions to suit your spe cific plant requirements
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2 GEARLESS MILL DES The gearless mill drive eliminates ring gear pinion gearbox coupling motor shaft and motor bearings used within a conventional mill drive system By mounting the rotor poles directly onto the mill the mill itself becomes the rotor of the gearless motor Building a track recordOnce you know the ideal speed of rotation for your mill jars you will need to design your mill around this critical parameter With most ball mill designs you have two areas of speed reduction to tweak from the motor drive shaft to the drive pulley and from the roller bar to the milling jar
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Girth gear drives have been and continue to be the primary method of driving SAG mills Ball mills and other rotating elements Several thousand grinding mills have been manufactured and have been in operation for the last century The gearless drive came into the minerals industry in and as per their reference lists SiemensInching Drive Backstops/Brake System for Ball Mills Kiln Drives and The inching drive is an auxiliary drive for rotating the ball mill when maintenance work is done on the mill It consists of an electric motor and gear reducer It may be portable to the The Gilford Hill Cement Plant located in Dallas Texas More info
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The question what drive system is optimal for SAG and ball mills is project specific and depends on the plant layout and the design of the grinding circuit When drives systems are compared the main criteria are operating characteristics fixed speed or variable speed starting behavior interaction with network harmonic distortion The ball mill is a key piece of equipment for grinding crushed materials and it is widely used in production lines for powders such as cement silicates refractory material fertilizer glass ceramics etc as well as for ore dressing of both ferrous and non ferrous metals The ball mill can grind various ores and other materials either wet or dry
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Ball mills Ball mills are used for dry and wet grinding of different materials such as cement materials cement lime and ceramic materials PSP Engineering has continuously refi ned the design of its ball mills Horizontal ball mills have become a reliable part of grinding plants Main characteristics of ball mills seated on shoe type bearingsABB’s GMD is the most powerful mill drive system in the market to power semiautogenous SAG ball and autogenous AG mills This ’workhorse’ for grinding operations combines a robust service friendly and fit for purpose design to provide highest throughput reliability
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The SAG mill is followed by two 20 ft diam 7 500 hp gear driven ball mills Another type of drive less commonly used consists of a motor driven speed reducer that is coupled to one of two A Large concrete surface at mill drive end Fig 2A with increased tendency towards cracking Shaft position shst impairment of tooth contact and risk of wear B Mostly common foundation block Fig ZB for mill and drive unit Risk of foundation cracking negligible No impairment of tooth con
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