typical load factor for sag mill motor

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Factors Affecting Ball Mill Grinding Efficiency

2020-05-18· The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed that take this factor

SAG Mill Components Mineral Processing & Metallurgy

2020-05-18· SAG Mill Components Previous Next Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load

Mill (grinding) Wikipedia

2020-05-16· 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. A SAG mill

Fundamentals of a Motor Thermal Model and its Applications in

2007-06-06· 42 Motor Thermal Model Protection Applications by, extensive heating of the different motor parts involved in machine operation. That is why we ﬁ nd accurate tracking of motor thermal status and adequate response of the motor control system to abnormal situations to be very important.

Induction Motor an overview ScienceDirect Topics

The cage induction motor has a rotor core which is made up of laminations and conductors of This is representative of the run-up characteristic of a typical centrifugal pump. The factor of 1.3 is chosen to allow for a voltage of 90% rated value at the motor terminals during the starting (primarily AG/SAG) mill

Typical Power Factors for Common Electrical Loads ~

2020-02-28· 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.

Selecting Inching Drives for Mill and Kiln Applications

2016-05-21· Electric Motors The standard inching drive motor is a NEMA or IEC frame typically foot mounted to a motor scoop or base plate. Typical motor speeds are either 4 or 6 pole, i.e. 1750 rpm or 1170 rpm for 60 Hz applications and 1450 rpm or 970 rpm for 50 Hz applications. The advantage

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

Milling Energy intensive and high maintenance

2018-05-09· • No process control available via the mill speed • The power factor of the motor is low and changes depending on the load. A power factor correction has to be considered • The WRIM + LRS system is causing high transient torques during the start-up. Figure 5. The WRIM + LRS is causing high transient torques during the start-up.

5 Most Common Motor Load Types EEP

2020-05-18· Home / Technical Articles / 5 most common motor load types. Load profile (speed range, torque and power) A constant torque load type is typical when fixed volumes are being handled. For example screw

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

2018-05-10· Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed The number of poles is based on the required speed of the mill. The motor operates with typical frequencies from zero to about 6 Hz. In general, The network power factor in this mode is from about 0.2 up to 0.8.

Milling Energy intensive and high maintenance

2018-05-09· • No process control available via the mill speed • The power factor of the motor is low and changes depending on the load. A power factor correction has to be considered • The WRIM + LRS system is causing high transient torques during the start-up. Figure 5. The WRIM + LRS is causing high transient torques during the start-up.

Motor-Starting Sags

2019-02-04· Motor-Starting Sags. Motors have the undesirable effect of drawing several times their fullload current while starting. This large current will, by flowing through system impedances, cause a voltage sag which may dim lights, cause contactors to drop out, and disrupt sensitive equipment.

Typical Motor No-Load Currents Electric motors &

2004-03-21· Comment: NFPA 70 NEC Table 430-150 shows 27A for 20HP, 460V, 3ph squirrel-cage induction motor. The measured 20A would be about (20/27) x 100%= 74%, which is very high current. Some catalogs indicate no load current of motors, e.g. Baldor Motors and Drives Catalog "AC Motor Data Catalog 502" dated Appril 1992, shows several 20HP motors Full Load Amps (FLA) and No Load

How To Calculation Critical Speed Of Sag Mill

Ball Mill Design/Power Calculation. A 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.

Overload Detection in Semi-Autogenous Grinding: A

Detecting the onset of overloading in a semi-autogenous grinding (SAG) mill is a challenging task for operators to perform due to the complex and nonlinear nature of an overload. To detect an overload, operators must simultaneously monitor the correlations between several measurements of the SAG

Motor loads calculation Electrical Engineering Centre

Electrical motor loads are calculated from power in kW and full rated load in kW.Following is the formula how to calculate Motor loads. Example : We have 1 unit Induction Motor with 30 horsepower (hp),running with 34.9 amps for amperage load and 460 volts 3 phase and power factor value is 0.75 and motor efficiency is 85%

Modeling and Evaluation of Cycloconverter-Fed Two

Abstract: Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30° shift between the two windings, fed by a two-secondary delta-delta-wye power transformer and two six-pulse cycloconverters. This stone presents and evaluates three different modeling options for the SAG mill drive.

Selecting Inching Drives for Mill and Kiln Applications

2016-05-21· Electric Motors The standard inching drive motor is a NEMA or IEC frame typically foot mounted to a motor scoop or base plate. Typical motor speeds are either 4 or 6 pole, i.e. 1750 rpm or 1170 rpm for 60 Hz applications and 1450 rpm or 970 rpm for 50 Hz applications. The advantage

Equipment Load Factors, Use Factors and Diversity Factors As Well

2019-03-14· Sometimes motor load factors that are too low are chosen because the auditor has not properly determined the hours of use of the motors i.e. the auditor uses an incorrect use factor. For example, just because a facility has a production shift that is 2000 hours per year it does not mean that all of the production-related motors in that facility are operated for 2000 hours per year.