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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 .
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.
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.
Motor torque, load torque and selection of motors 2/43 2.1 Motor speed–torque curve Refer to Figure 2.1 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.
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
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,
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.
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
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.
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 .
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.
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 ...
Aug 04, 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 D.C motors are used?
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.
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 ...
12 Basic Motor Types Used For Industrial Electric Drives (photo from: DOE Navigant Master Presentation) ... Since it has high starting torque and variable speed, it is used for heavy duty applications such as electric locomotives, steel rolling mills, hoists, lifts and cranes.
The combination of series and shunt winding allows the motor to have the torque characteristics of the series motor and the regulated speed characteristics of the shunt motor. cumulative compound motors are used for different applications i.e. Elevators, Rolling mills, Punches, Shears & planers etc. Construction of DC Motors
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 .
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.
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.
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
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