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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.
The working roll diameter is 500 mm. Determine the rolling load on the rolling stand if the co-efficient of friction is 0.07. Also determine the rolling torque. Solution: Example 2: A billet of area of section 150 mm x 150 mm is rolled to 120 height in a rolling mill with 600 .
Speed – Torque Characteristics (N v/s T) Since a series motor develops high starting torques at low speeds and low torque at high speeds, therefore, speed – torque characteristics of a DC series motor is a hyperbola. High starting torque enables, even a small series motor to start a heavy load. Application of DC Series Motor
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 speed.Assuming 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.
Direct-current motor. An electric rotating machine energized by direct current and used to convert electric energy to mechanical energy. It is characterized by its relative ease of speed control and, in the case of the series-connected motor, by an ability to produce large torque under load without taking excessive current.
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
Thanks for A2A. First of all, DC Shunt Motors have a constant speed characteristics that means from No-load to full load, It doesn't change its speed (ideally speaking) but practically there occurs some drop in the speed due to friction and windag...
mining machine ore torque speed characteristics of, mining machine ore torque speed characteristics of vertical raw mill;, rolling mill speed reducer gearbox RC series helical gearbox RC motor gearbox horizontal or vertical High Quality Torque Low RPM Vertical Shaft PV Speed Reducer Small size light weight torque efficiency and high starting transmission efficiency low noise characteristics,
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.
Rolling processes 5-1 introduction: Rolling is the process of reducing the thickness or changing the cross section ... Figure (5-2) illustrates the sequence of steps in a steel rolling mill to show the variety of products made. ... using a lower rolling speed N to reduce power. 5.4 Shape rolling: In shape rolling, the work is deformed into a ...
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 motor.These characteristics are determined by .
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 .
Jul 20, 2016· o Rolling is used mainly to produce sheet of metal o or simple cross sections, such as rail tracks. o a drive (motor) for applying power to the rolls and controlling the speed o rolling mills are one of the most demanding applications for motor drives o Typical motor sizes for modern rolling mills is 600kW to 1200kW
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 Millsdd 9 10/24/2011 4:20:50 PM. 10
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.
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.
Feb 12, 2018· The starting torque of DC series motor is very high but limitation is it can not operate in no load condition because if it is operate on no load then due to high to it achieve very high speed and due to this it may damage the rotor. The starting ...
Torque-speed characteristics. Series wound electric motors respond to increased load by slowing down; the current increases and the torque rises in proportion to the square of the current since the same current flows in both the armature and the field windings. If the motor is stalled, the current is limited only by the total resistance of the ...
torque speed characteristics of rolling mills. Dynamic characteristics of a rolling mill drive system Jan 01, 2000· From Eq.(11) in Section 3, it is known that the torque amplifiion factor (TAF) is a function of the normal rolling force and the rolling speed.Assuming the rolling speeds to be 10, 20, 30, 40, 50, 60 and 70 rpm, respectively, the ...
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 ...
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.
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
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.
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