Nov 21, 2016· 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 charact.

The speed reducer plays a role in matching the rotational speed and transmitting torque between the driving link and the working machine or the actuator and is widely used in the rolling mill The working characteristics of the speed reducer are low speed, heavy load, large impact load, frequent impact times, and continuous operation

Special and custom-made motors for hot rolling mills are manufactured by our subsidiary INDAR The motors required for the Steel industry, are machines incorporated with high torque and variable speed characteristics With this purpose in mind the manufacturing program includes: Low speed synchronous motors: controlled by cycloconverter- fed units

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

Motor torque, load torque and selection of motors 2/43 21 Motor speed–torque curve Refer to Figure 21 where T st = starting torque or breakaway torque T m = minimum, pull-in or pull-up torque T po = pull-out, breakdown or maximum torque, obtainable over the entire speed range

torque speed characteristics of rolling mills rolling mill startup torque calculation - universalbiotechin machine tools,process rolling mills,paper and textile industries,and many othersfig 51 speed torque characteristics of dc , rolling mills the st torque Contact Supplier

Motor characteristics are frequently given as two points on this graph: The stall torque,, represents the point on the graph at which the torque is a maximum, but the shaft is not rotating The no load speed,, is the maximum output speed of the motor (when no torque is applied to the output shaft)

Dynamic characteristics of a rolling mill drive system , Jan 01, 2000 From Eq(11) in Section 3, it is known that the torque amplification factor (TAF) is a function of the normal rolling force and the rolling speedAssuming the rolling speeds to be 10, 20, 30, 40, 50, 60 and 70 rpm, respectively, the relationship between two stations of the normal rolling force and the torque .

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 .

Download Citation on ResearchGate | 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 .

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

Depending on the connections of the field to the power supply, the speed and torque characteristics of a brushed motor can be altered to provide steady speed or speed inversely proportional to the mechanical load Brushed motors continue to be used for electrical propulsion, cranes, paper machines and steel rolling mills

Torque Speed Characteristics Of Rolling Mills What guarantees the highest product quality in rolling mills? Rolling-mill main drives: Exemplary when it comes to smooth running characteristics and dynamic performance In rolling mills, interruption-free processes and the quality of the rolled steel are

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

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

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 ,

ball mill drive motor choices - Artec Machine Systems ball mills, the starting torque restrictions of some of the newer mill drive configurations, and the , costs and operating characteristics for each factor of comparison , in the past has been the low speed synchronous motor driving through an open pinion and bull gear , to accelerate the inertia of its own rotor and half

Nov 06, 2018· Until the late of the 1980s, when the variable frequency drive was not invented, dc motor was the best option for variable speed application Characteristics of DC Series, shunt & compound motor Series motor: DC series motor have poor speed control and high starting torque Speed control of this motor is possible by varying supply voltage

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

A Summary of the News: Conveyor speed torque required calculation excel sheet Cement Ball Mill Power Calculation : has the 2012 ball mill capacity load calculation of;Grinding Mill Calculation In Ball mill Wikipedia A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes, paints

Jan 01, 2000· From Eq(11) in Section 3, it is known that the torque amplification factor (TAF) is a function of the normal rolling force and the rolling speedAssuming the rolling speeds to be 10, 20, 30, 40, 50, 60 and 70 rpm, respectively, the relationship between two stations of the normal rolling force and the torque amplification factors as shown in Fig 7 are obtained

REDUCERS FOR MAIN DRIVES ОF ROLLING MILLS Sergey LAGUTIN * - Eugene GUDOV - Alexey KLOCHKOV JS Co “EZTM”, Electrostal, Russia , percentage of time engaged with each rolling size, Modes (torque and speed) for each of the rolling sizes, , weight but technical characteristics

Jan 06, 2016· Fans and pumps have steady-state torque–speed characteristics which generally have the shapes shown in Figure 115 These characteristics are often approximately represented by assuming that the torque required is proportional to the square or the cube of the speed, giving rise to the terms ‘square-law’ or ‘cube-law’ load

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 speed of slip ring induction motor can be changed up to 50% of its normal speed Slip ring induction motor is used for those industrial drives which require high starting torque and speed control such as lifts, pumps, winding machines, printing presses, line shafts, elevators and compressors etc

torque in rolling mills calculation formula with example (in Chinese) [10] Sims R B, Wright H Roll force and torque in hot rolling mills (A comparison mathematical and physical modeling of flat rolling Sep 24, 2009 Roughing mill Coil box The torque per width in N is the reduction in %

Matching Characteristics of Electric Machine and Load The machine and the load are the two components of an electro-mechanical energy-conversion system, and the machine characteristics, generally, play a predominant part in the operating behaviour of the complete system

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 ,

steel rolling mill motor design calculations Long products are normally rolled in several passes, whose numbers are determined by the ratio of the initial input steel material of rolled product), and characteristics of the rolling mill (number of stand, roll diameter, strength of rolls, rolling speed, available power of the drive motor, and rolling mill calculation ,

Small rolling-mill drives Design IM 1001 Applications Finishing stand motors for cold rolling mills, coiler motors for cold and hot rolling mills Power rating 06 – 3 MW Speed 200 – 1500 rpm Torque < 62 kNm Shaft height 630 – 800 mm Compact rolling-mill drives (medium size) Design IM 1001 Applications Drive for coilers, finishing stands .

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