Jan 06, 2016· LOAD REQUIREMENTS TORQUE–SPEED CHARACTERISTICS The most important things we need to know about the load are the steady-state torque–speed characteristic, and the effective inertia as seen by the motor. In addition, we clearly need to know what perform- ance is required. At one extreme, for example, in a steel-rolling mill, it may be necessary
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
Torque Speed Characteristics Of Rolling Mills. 12 basic motor types used for industrial electric,a simplified method to calculate the rolling force in,applications of three phase synchronous motor ,chapter 6 direct current motors ,characteristics of dc motors ,characteristics of dc motors ,dc motor characteristics ,dc shunt motors
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
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.
Torque Speed Characteristic of an Induction Motor Torque Speed Characteristic is the curve plotted between the torque and the speed of the induction motor. As we have already discussed the torque of the induction motor in the topic Torque Equation of an Induction motor. The equation of the torque is given as shown below.
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.
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
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).
Mar 12, 2019· The engine torque reaches its peak value at a speed where it is most efficient. In other words, the engine efficiency is at the maximum at a speed where it produces its peak-torque. If you raise the engine above this speed, its torque starts to decrease because of the increased friction of the engine’s moving parts.
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.
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
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.
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 Mills.indd 9 10/24/2011 4:20:50 PM. 10
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 charact.
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 in rolling mills calculation formula with . rolling mill speed calculation formula. . reduction that can be achieved and the power required to drive the . Get Price And Support Online; calculation of torque on grain mill ptfewire. Example 22.5 Grain Mill. . The calculation of roll force and torque in hot rolling mills .
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
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
Feb 25, 2016· The product characteristics which are controlled are the geometric shape and tolerance. Calculation of roll force is important because calculation of torque and power in a rolling mill is
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 inter-stand tension inferential control systems are used to stabilize the rolling motor torque. To stabilize the motor torque the electric drive system with the properties of the rolling motor
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 D.C Series, shunt & compound motor. Series motor: D.C series motor have poor speed control and high starting torque. Speed control of this motor is possible by varying supply voltage.
Dec 20, 2015· Here the speed rises sharply as the load torque reduces as in Fig. 5.60(c). This type of Electric Motor Characteristics is possessed by a dc series motor ideally suitable for traction-type loads. The accelerating (starting) and decelerating (braking) characteristics of motor-load systems are also of equal importance in their industrial
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
Dec 20, 2015· Here the speed rises sharply as the load torque reduces as in Fig. 5.60(c). This type of Electric Motor Characteristics is possessed by a dc series motor ideally suitable for traction-type loads. The accelerating (starting) and decelerating (braking) characteristics of motor-load systems are also of equal importance in their industrial
excell sheet calculation torque speed power for rolling mill; such as ultra-low speed rolling with minimal torque ripple, or high speed rolling associated with reels. • Ability to achieve very large drive power and/or wide field weakening .. Calculation of characteristics (equivalent circuit. Get Price. EffTool User's Manual ABB Group.
Jul 20, 2016· Rolling mills o The process of deforming metal by passing it between rolls o Rolling mill is a machine or a factory for o shaping metal by passing it through rollers o to crush or grind various materials, such as grain, ore, gravel, plastic, and others o A rolling mill basically consists of o
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.
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?
Jun 05, 2015· The three factors that determine the type of work a motor can produce are speed, torque, and horsepower. Speed is defined as how fast the motor performs its work. For example, a shaft can rotate
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
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.
May 24, 2015· Calculate the value of the dynamic braking resistor that will be capable of 375 N-m torque at 1050 r.p.m. The windage and friction losses may be assumed to remain constant at both speeds. Incoming search terms: The electric braking system commonly employed in rolling mills elevators and printing presses is; braking system in rolling mill
Jan 01, 2000· Read "Dynamic characteristics of a rolling mill drive system with backlash in rolling slippage, Journal of Materials Processing Technology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Feb 25, 2016· The product characteristics which are controlled are the geometric shape and tolerance. Calculation of roll force is important because calculation of torque and power in a rolling mill is
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
Jun 18, 2014· Roll pass design is an essential part of long product rolling process, since the long products are rolled between the shaped rolls in the long product rolling mills. Roll pass design generally means the cutting of grooves in the roll body through which steel to be rolled is made to pass sequentially to get the desired contour and size.
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