typical load factor for sag mill motor

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SAG Mill Grinding Circuit Design Ball mill A typical type of fine grinder is the ball mill A slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or metal which grind material to the necessary fineness by friction and impact with the tumbling balls

Optimization of the single stage SAG mill circuit at the

186 Circulating Load excl Pebbles 275 Mill installed power kW 16 500 Critical speed normal 60 to 80 Ball charge up to 15 The cyclone SAG Power draw kW 12 286 13 992 SAG Power usage 74 6 84 8 SAG Motor Current A 2 040 2 316 SAG Mill Speed rpm 8 9 8 7 of critical speed

Typical Power Factors for Common Electrical Loads

Power factor is very critical for calculating or measuring the electrical power consumed by an electrical device on an alternating current supply To be able to determine electrical power on alternating current AC systems you need to know the power factor of the electrical load Below is listed the typical power factors for common electrical

Conveyor Belt Calculations Bright Hub Engineering

This article will discuss the methodology for the calculations of belt conveyor design parameters with one practical example of the calculations and selection criteria for a belt conveyor system Calculations include conveyor capacity belt speed conveyor height and length mass of idlers and idler spacing belt tension load due to belt inclination angle of the conveyor coefficient of

Benchmarking SAG Mill Power Draw Models SAGMILLING COM

Benchmarking SAG Mill Power Draw Meadowbank Muteb P Allaire J Meadowbank Mine Process Plant Throughput Increase Proceedings of the Canadian Mineral Processors Annual General Meeting Ottawa Canada January 2013

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centrifugal force ball mill dcbackyardgrill Sep 02 2018· Ball mill is a horizontal rotating device transmitted by the outer gear The material are transferred into the grinding chamber through the quill shaft uniformly mill small ball mill wet pan mill mini ball mill mill vertical mill ultra fine grinding mill vibrating ball mill sag mill More Live Chat lab ball mill grinding

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201479 ensp 0183 enspmarket Many of our motors are completely designed engineered and manufactured at our 348 000 sq ft motor manufacturing pla nt which gives us the flexibility to customize our motors to perform beyond a wide variety of industrial and appliion requirements

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Mill Dual Motor Sag Mills Dual Pinion SAG Mill 2x LSS Motor Airclutch manual dominion sag mill Sag Mill Pinion Failure Overgrinding In Sag Mills Typical Load Factor For Sag Mill Motor Trò chuyn vi bán hàng 18 X 10 5 FULLER SAG MILL Nelson Machinery Equipment We have more SAG MILLS available also

Motor temperature rise and ambient temperature Electric

Hello Our Sag mill motor is rated 1500HP with 4000V 212A and 0 8 lead power factor insulation class F and permissible temperature rise 80K Our motor is actu Motor temperature rise and ambient temperature Electric motors generators engineering Eng Tips

implementing strategies to improve mill capacity and SAIMM

loads that range between 230 – 450 See figures 3 4 5 and 6 for circuit types The grinding operation in a mineral processing facility typically consumes the majority of the energy used In addition to energy these mills consume special steel rods or balls as well as the steel mill linings Combining all of these factors we nbsp

Determination of lifter design speed and filling effects

Previous work Djordjevic 2003 demonstrated that from the point of view of power draw modelling a cylindrical tumbling mill could be represented with a vertical


LOW SPEED ASYNCHRONOUS MOTORS FOR MILL to the SAG mill circuit due to the need to accommodate ore can maintain motor speed to support Mill specified

Belt Tension an overview ScienceDirect Topics

where T b is the belt tension N f is the coefficient of friction L is the conveyer length in meter divided by two g is the acceleration due to gravity 9 81 m s 2 m i is the load of idlers within 1 m length of conveyer belt kg m b is the load of 1 m length conveyer belt kg m m is the load of the conveyed materials per meter length

Motor Efficiency Power Factor and Load EC M

The PF of a motor is lower when the motor is under loaded and is significantly reduced when the motor load is less than 70 Closely matching the motor to the load is the best way to keep the PF close to the motor design rating which is typically 80 to 85 PF Motor system power factor improvement project

Steel mill tackles power quality and power factor problems

Steel mill tackles power quality and power factor problems The mill stand motor drives are the largest harmonic producing load on the plant s electrical system Connected through step down transformers these drives are 6 pulse units generating predominantly a 5th harmonic current during operation Since nonlinear loads are typical in

Uneven SAG Mill Drive Power Draw Grinding

In my opinion current imbalance on motors of a twin Pinion Mill Drive train is caused by inaccurate load sharing Power supply to the motor has no effect as it is passive and power is drawn as needed Since this is a WRIM and LRS set up no VSD with active load sharing or Quadramatic the motors rely on natural load sharing

Starting protection synchronization and control for

2009113 ensp 0183 enspfollowing typical cage heating protection characteristics are used Restart Protection The SPM simulates the cooling of a running motor updating the relay thermal memory in oneminute spans The SPM will also learn the amount of thermal capacity required for a successful motor start Each new value of the thermal capacity

Optimization and Control of a Primary SAG Mill Using Real

Optimization and Control of a Primary SAG Mill Using Real time Grind Measurement C W Steyn K Keet W Breytenbach employs a φ7 3 m x 8 2 m EGL SAG mills with 2 x 5200 kW motors in primary milling duty An average of 77 4 ton or 16 increase from 477 ton to 555 ton was observed on mill load between periods Aug 10 to Oct 10

Sizing Gen Sets For Large Motor Starting Electrical

to start as well as run connected motor loads You must consider all these factors for proper Induction motors have typical starting

Shelving Spans for Bookcases

a shelf can be without an objectionable sag EXPECTED LOAD Another factor used to determine A running foot of average sized books weighs

Conveyor Chain Designer Guide

given breaking load However conveyor chain does not follow this convention For each breaking load conveyor chain has multiple pitch sizes available The minimum pitch is governed by the need for adequate sprocket tooth strength the maximum pitch being dictated by

Calculate Technical Losses of Transmission Distribution

 · Introduction There are two types of Losses in transmission and distribution Line 1 Technical Losses and 2 Commercial Losses It is necessary to calculate technical and commercial losses Normally Technical Losses and Commercial Losses are calculated separately Transmission Technical Losses are directly effected on electrical tariff but Commercial losses are not implemented

29 8 2001 ASHRAE Fundamentals Handbook SI

29 8 2001 ASHRAE Fundamentals Handbook SI fan cooled TEFC motors are slightly more efficient For speeds electric motor load is an appreciable portion of cooling load the The radiation factor F R is applied to the average rate of appliance energy consumption determined by applying usage factor F

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Zamil Steel Manual Structural Steel Framing

Zamil Steel Manual Ebook download as PDF File pdf Text File txt or read book online

Conveyor Chain Designer Guide Renold

When a chain articulates under load the friction between pin and bush whilst inherently low because of the smooth finish on the components will tend to turn the bush in the inner plates and similarly the bearing pin in the outer plate To prevent this the bush and pin

Mill Dual Motor Sag Mills 555nm eu

typical load factor for sag mill motor centrostampa srl it Dual Pinion SAG Mill 2x LSS Motor Airclutch manual dominion sag mill Sag Mill Pinion Failure Overgrinding In Sag Mills Typical Load Factor For Sag Mill Motor Trò chuyện với bán hàng 18 X 10 5 FULLER SAG MILL Nelson Machinery Equipment

2018 National Transit Summaries and Trends

Load factor total passenger miles traveled divided by total vehicle revenue miles is the average number of passengers on board a vehicle or passenger car In 2018 the average load factor for a light rail system was 21 5 while the average load factor for a bus rapid transit system was 16 7

Powerful gears in rolling mills Machine Design

A typical strip mill consists of a Most of the time the gearbox operates at moderate load usually less than 15 of the motor rating Poor load distribution is attributed to three factors

Synchronous Motors

Typical motor applications include SAG and ball mills crushers grinders and pumps WEM motors are suitable for use with variable speed and load sharing applications For every unique application WEM works closely with customers through every stage engineering software development manufacturing and training Service Support Upgrades

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The design shown here customisable is 12 x 4 with welded in 1 lifter bars A typical Batch SAG Mill 12 diameter X 4 long mild steel construction complete with one removable head welded in lifters rubber lined 1 HP motor gear reducer drive support Contact Now


2009730 ensp 0183 enspLG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 Gross power No load power Net power drawn by the charge 8 13 The net power is calculated from Net power KD2 5L e c Watts 8 14 In equation 8 14 D is the diameter inside the mill liners and Le is the effective length of the mill including the

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The SAG test reproduces commercial SAG mill grinding conditions on 4 5 L of ore and determines the SAG mill specific pinion energy to grind ore from 80 passing 152 mm to 80 passing 1 7 mm W SDT herein referred to as macro ore hardness The SAG mill product is then crushed to 100 passing 3 35 mm and is subjected to the Bond ball mill work



Mining Grinding and Processing WEG

In addition to the efficiency levels power factor correction high torques and low starting current the constant speed under load variations and low operating and maintenance costs are the main reasons why WEG Synchronous Motors are used in mill driving systems Induction motors For ball and SAG AG mills with a single or double pinion


2017223 ensp 0183 enspload of an air clutch This paper limits its scope to investigating the serviceability and economics of five mill motor options that are currently able to meet these limitations II SYSTEMS TO BE CONSIDERED The following five drives systems are to be studied Drive 1 A 5000 HP 1200 rpm wound rotor motor with liquid rheostat and power factor

3 PAPER Michael Hamilton FINAL

2018416 ensp 0183 enspThe mill motor is started by use of a secondary liquid resistance shows a typical motor torque speed curve Figure 3 Typical Motor Torque vs Speed Curve currents depending on the number of poles speed of the motor Another factor in the

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SAG is an acronym for semi autogenous grinding SAG mills are autogenous mills that also use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21 The largest SAG mill is 42 12 8m in diameter powered by a 28 MW 38 000 HP motor

Service Factor Engineering ToolBox

The service factor SF is a measure of periodically overload capacity at which a motor can operate without damage The NEMA National Electrical Manufacturers Association standard service factor for totally enclosed motors is 1 0 A motor operating continuously at a service factor greater than 1 will have a reduced life expectancy compared to operating at at its rated nameplate horsepower

Power Factor The Basics IEA 4E

a heavy load we want power factor to be as close to 1 0 as possible Sometimes however our electrical distribution has a power factor much less than Induction motors Induction generators wind mill generators Even with energy efficient motors power factor is significantly affected by variations in load A motor must be operated

System for monitoring mechanical waves from a moving machine

AG mills and SAG mills has traditionally been via load cells estimating normal level of charge impact on the liner while the lower unit was below


2018510 ensp 0183 enspTECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS M Ahrens ABB Switzerland J Gonser ABB Switzerland Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed simple using the mill body as motor rotor and mounting the poles there

Calculating Power Draw when sizing Ball Mills Grinding

Apr 4 2017 The energy draw in a ball mill is friction plus the work to lift the load of balls and slurry mostly balls up the wall so that it can free fall and create grinding It has absolutely nothing to do with rate at which the slurry is being replaced by new or recirculating feed How in the world can a ball mill motor know the nbsp


PREMIUM EFFICIENCY MOTOR SELECTION AND APPLICATION GUIDE i ACKNOWLEDGMENTS The Premium Efficiency Motor Selection and Application Guide and its companion publication Continuous Energy Improvement in Motor Driven Systems have been developed by the U S Department of Energy DOE Office of Energy Efficiency and Renewable Energy EERE with support

Determining Electric Motor Load and Efficiency

Figure 2 Motor Power Factor as a Function of Full Load Amperage Overloaded motors can overheat and lose efficiency Many motors are designed with a service factor that allows occasional overloading Service factor is a multiplier that indicates how much a motor can be overloaded under ideal ambient conditions For example a 10 hp motor

Choosing a SAG Mill to Achieve Design Performance

SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates Typical tests required to define a hardness variability function are given below in Figure 1


The factors used to convert between a DCS power measurement which may be based on a MCC cabinet or the motor input taps and the mill shell are those presented in Doll 2012 All motors are assumed to operate at unity power factor Operating data Mill operating data including mill dimensions charge levels and mill speed has been collected

Types of Load Typical Demand and Diversity Factors

Jan 12 2018 · Domestic load Commercial load Industrial load Municipal load Irrigation load Traction load Diversity Factors This Types of Load is the electric power needed for pumps driven by motors to supply water to fields Generally this type of load is supplied for 12 hours during night Typical Demand and Diversity Factors

Demand Factor Diversity Factor Utilization Factor Load Factor

Demand Factor Maximum demand of a system Total connected load on the system Demand factor is always less than one Example if a residence having 6000W equipment connected has a maximum demand of 300W Than demand factor 6000W 3300W 55 The lower the demand factor the less system capacity required to serve the connected load

Morrell C model SAGMILLING COM

This motor input is immediately converted to mill shell power for use in circuit model equations by multiplying the model result by 0 97 mechanical efficiency factor and by 0 96 typical induction motor efficiency factor The displayed Morrell C model result in sagmilling com is always corrected to mill

Choosing a SAG Mill to Achieve Design Performance

Choosing a SAG Mill To Achieve Design Performance John Starkey1 Principal Consulting Engineer Sami Hindstrom2 Manager It is the consultant s job to assess these factors and methods and recommend to the client a Where x the load in the mill expressed as measured by volume and y


lifter configurations and operating parameters on the mill efficiency and performance The MillTraj software was also utilized to simulate the outermost charge trajectories in terms of lifter profiles and mill speeds For the mill with higher mill load and lower speed the power draw of the mill differed

Power systems Objective Type Questions Gate Preparation

Power systems Objective Type Questions Gate Preparation Power generations 1 An industrial consumer has a daily load pattern of 2000kW 0 8 lag for 12 hrs and 1000 kW UPF for 12 hrs The load factor is a 0 5 b 0 75 c 0 6 d 2 0 Answer 0 6 2 What is the maximum value of a load which consumes 500 kWh per day at a

Motor temperature rise and ambient temperature Electric

Our Sag mill motor is rated 1500HP with 4000V 212A and 0 8 lead power factor insulation class F and permissible temperature rise 80K Our motor is actually used at 112 of nominal charge 1320kW 0 943 lead P F 190A 4220V

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