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As regards “abnormal” rolling conditions - which are more or less very “normal” for rolling mills - roll damage often occurs with consequences for the mill and the rolled product Evidently the reasons of roll

TAF is the torque amplification factor and is the ratio between break-away torque and torque in steady state conditions It is used to judge design improvements to the extension shafts of a rolling mill The objective was to determine whether the new hollow ex- tension ,

Synchronous motors have the following characteristics: A three-phase stator similar to that of an induction motor Medium voltage , The motor will run at synchronous speed and produce Synchronous Torque , slow speed fans, pumps, ball mills, metal rolling mills

The characteristics of the motor should be such that it is best adapted for the service required The torque required at starting, the maximum torque, speed control and speed constancy, as well as the character of the energy available, are all important factors in the selection

the torque and to measure the mill parameters as well (the force, the mill speed, the gap between work roll etc) This system is a part of the integrated control process Keywords: Cold rolling mill, torque, vibration, chatter, quality control, maintenance 1 INTRODUCTION

Starting torque of IM can be increased by using external rotor Resistance at starting, but in case of squirrel cage motor, adding external Resistance to rotor circuit is not Possible High starting torque in squirrel cage IM is obtained by using D.

May 27, 2016· A simplified method to calculate the rolling force in hot rolling Authors; Authors and affiliations; Si Li; Zhigang Wang; , The calculation of roll force and torque in hot rolling mills , (2013) Multi-factor coupling system characteristic of the dynamic roll gap in the high-speed rolling mill during the unsteady lubrication process

AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects TMEIC designs and manufactures two types of AC solutions for this purpose Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as roughing and finishing stands

Jun 15, 2015· The speed-torque characteristic of this type of load is given by T=K and is shown in the Figure , Because of stiction, the speed-torque characteristics of the loads are modified near the zero speed For a constant torque type of load, the characteristic as modified due to stiction is shown in Figure , are best suited for the rolling mills .

Transient Torsional Vibrations Control in the Geared Drive Trains of the Hot Rolling Mills , vibration by controlling the motor speed and torque The simulation results show that the fuzzy .

Generally, three characteristic curves are considered important for DC motors which are, (i) Torque vs armature current, (ii) Speed vs armature current and (iii) Speed vs torque These are explained below for each type of DC motorThese characteristics are determined by ,

Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, using the condition for plastic deformation in rolling derived by Orowan, together with von Kármán's equation of equilibrium Although applying strictly to the rolling of ideal plastic-rigid materials, these equations may be applied to the .

– Calculate roll separation force (“rolling force”) and torque – Processing Limits – Calculate rolling power Prof Ramesh Singh, Notes by Dr Singh/ Dr Colton 13 Flat Rolling Analysis • Consider rolling of a flat plate in a 2-high rolling mill

Nov 06, 2019· Application of DC Compound motor ⇒ By compound motor, we get high starting torque and nearly constant speed Because of that Compound motors are used where we require high starting torque and constant speed ⇒ A compound motor is used in Presses, Shears, Conveyors, Elevators, Rolling Mills, Heavy Planners, etc Why DC motors are used?

ROLLING MILL PERFORMANCE , mance such as speed response (subject to constraints on maximum torque on key com- , As discussed previously, an important aspect of hot mill operation is the maximum torque on the shafts If the damping coefficients are small, and a constant load f is

The characteristics are shown in Figure 1 and 2 (1)Speed- current and Torque-current characteristics of dc shunt motor 49 (2 ) Speed-Torque characteristics of dc shunt motor • Example 44 A dc shunt generator supplies a load of 10 kW at 220 V through feeders of resistance 01Ω

The principal characteristics of DC motors are (1) the dependence of the motor speed n on the shaft torque—the speed-torque characteristic—and (2) the dependence of the torque on the armature (rotor) current I Ar The shape of the characteristic curves (Figure 2) is determined by the excitation system of the motor (Figure 1)

The mechanical rolling conditions in hot strip mills are precisely defined by various variables, which are taken directly froth the rolling schedule (separation force, torque speed strip thickness) or calculated from figures of the rolling schedule and dimensions of the mill ,

When the slab enters into the rolling mill the actual speed of the work rolls drops, because the speed controller needs time to build up the torque reference This behavior is referred to as impact speed drop [%s] The higher dynamic settings of the speed controller the faster is the torque build-up time and the smaller is the impact speed drop

conditions, such as ultra-low speed rolling with minimal torque ripple, or , that adjustable-speed motors for rolling mill applications are equipped with a rotor , Large AC Adjustable Speed Motors for Metals Rolling Millsindd 9 10/24/2011 4:20:50 PM 10

CONTROL OF DC MOTORS THROUGH PHJASE CONTROLLED RECTIFIERS , Nature of speed torque characteristics, speed regulation, speed range, efficiency, duty cycle, quadrants of operation, speed fluctuations if any, ratings etc , Paper making industries, rolling machines etc

The universal motor is modified in several ways to allow for proper AC supply operation There is a compensating winding typically added, along with laminated pole pieces, as opposed to the solid pole pieces found in DC motors A universal motor's armature typically has far more coils and plates than a DC motor, and hence fewer windings per coil

Calculation Of Torque On Grain Mill - ilcapriccio-falisollebecalculation of torque for ball mill , 2015 ball mill speed The Calculation of Roll Force and T Jaw Crusher The Jaw crusher is used for Primary crushers and Secondary crushers for crushing all kinds of minerals and rocks with compressive strength less than 320 mpa

Different number of stator and armature fields as well as how they are connected provide different inherent speed/torque regulation characteristics The speed of a DC motor can be controlled by changing the voltage applied to the armature The introduction of variable resistance in the armature circuit or field circuit allowed speed control

torque speed characteristics of vertical raw mill-[crusher The Deswik TM mill is a new development of the vertical stirred mill type especially designed for ultra fine grinding Depending on the conditions the mill can grind , torque speed characteristics of vertical raw mill-[crusher , Read more

May 18, 2018· Continuous Cold Rolling Mills These work only in the forward direction and no reversing is required The metal passes in one direction only in different stands till the product has the required thickness, The mill may be two high or four high The coiler roller requires accurate torque and speed control The strip tension must be constant and .

torque speed characteristics of rolling mills The Calculation of Roll Force and Torque in Hot Rolling Mills Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, using the condition for plastic deformation in rolling derived by Orowan, together with von Kármán's equation of equilibrium

Torque and Power in Cold Rolling *Power is applied to the rolling mill by applying Torque to the rolls and by using roll strip tension*The total rolling load is distributed over the arc of contact *However, the total rolling load can be assumed to be concentrated at a point along the arc of

torque speed characteristics of vertical raw mill vertical milling characteristic dehelling HOME >Mill for Mining >vertical mill speed characteristic vertical mill speed characteristic torque speed torque speed characteristics of vertical raw

The study aims to determine effect of the fluctuating technological conditions of rolling on distribution of inter- stand tensions and loads of rolling motors for three variants of the continuous rolling mill: with the speed control system only, for electric drive of the rolling mill with properties of the torque ,

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