IS 13555 (1993): Guide for Selection and Application of 3 ...
5.3.1 Torque-Speed Chracteristics ... constant pressure; soot blowers, rolling mills, belt conveyors, mills without fan action, and ... the power in proportion to the square ofthe speed. These characteristics are typical for machmes smoothening cloth paper, calendering machines, etc. The torque increasing in proportion to the ...
UNIT 1 CHARACTERISTICS OF ELECTRICAL DRIVES Speed ...
Selection of particular type of motor driving an m/c is the matching of speed-torque characteristics of the driven unit and that of the motor. · Different types of loads exhibit different speed torque characteristics. · Most of the industrial loads can be classified into the following 4 general categories: 1. Constant torque type load.
DRIVE MOTOR CHARACTERISTICS - Tamilnadu
This method is commonly used for presses, elevators, rolling mills and machine tools. Fig Plugging condition and Speed torque characteristics Plugging is executed at a time when the motor is operating at the point E characteristics A for a load torque T L.
How to Obtain Rolling Torque? | Metals | Metallurgy
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 …
torque in rolling mills calculation formula with example
Metals Metallurgy. The working roll diameter is 500 mm Determine the rolling load on the rolling stand if the coefficient of friction is 007 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 mm roll diameter at a temperature of 1100 °C at 3m/sec.
Electrical Drives
Torque independent of speed. The characteristics of this type of mechanical load are represented by setting k is equal to zero and C equals to 1.While torque is independent of speed. Such examples are hoists,the pumping of water etc. 2. Torque linearly dependent on speed. The torque is linearly proportional to speed k=1,and the
III B. Tech II semester (JNTUH-R15)
Nature of speed torque characteristics, speed regulation, speed range, efficiency, duty cycle, quadrants of operation, speed fluctuations if any, ratings etc Transient operation requirements: Values of acceleration and deceleration, starting, braking and reversing performance Requirements related to …
The Study of Continuous Rolling Mill Inter-stand Tension ...
torque stabilization by to the effect on speed of the previous, further or controlled mill stand. The tension control accuracy depends on how exact the unhindered rolling torque is determined.
Rolling mills exhibit what type of load torque ...
Electronics & Electrical MCQs Calculate the value of the angular acceleration of the motor using the given data: J = 81 kg-m2, load torque = 74 N-m, motor torque = 89 N-m. .195 rad/s2 .182 rad/s2
As the load is increased the speed of D. C. shunt motor will
The speed-torque characteristics of different DC motors are as shown in the below figure. ... rolling mills, metallurgical works, etc. DC Cumulative compound motor: It has high starting torque and has varying speed within limits i.e. it has self-adjustable speed with changing the load. Hence, it is used for driving compressors, pressure blowers ...
Characteristics of Electric Motors | Electrical Engineering
Speed-torque characteristics of a fan and the drive motor and the joint speed-torque characteristic of a motor fan unit are represented by curves I, II and III respectively in Fig. 1.11. When the unit attains a steady speed ω s, the motor operates with the torque T = load torque, T L .
Motors for Metal Rolling Mills | TMEIC
Motors for Metal Rolling Mills. 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 ...
DC Motor Characteristics - your electrical guide
Torque – Current Characteristics (T v/s I a) We know that, T α I a φ But flux of a shunt motor is practically constant. Therefore, T α I a Therefore, torque current characteristics of a shunt motor is a straight line passing through the origin. Although the field current remains practically constant, yet the field flux becomes slightly weaker at heavy loads, due to armature reaction ...
Torque In Rolling Mills Calculation Formula With Example
Torque Speed Characteristics Of Rolling Mills. Torque speed characteristics of rolling mills torque–speed characteristics electric equipment speed is defined as how fast the motor performs its work for example a service online torque speed of vertical roller mills rolling mill speed calculation formula pdf calculating roll force and torque.
Torsional Vibration for Rolling Mill with the Drive System ...
A rolling mill driving system is a multiple degree of a freedom torsional vibration system [].The torsional vibration of a driving system causes the rolling speed to change dynamically, providing instability factors at rolling interface and impacting the strip quality [2, 3].Therefore, it is necessary to explore the torsional vibration caused by the structural problems of the main drive system.
Electric Drives Mcqs - Engineering Mcqs
Explanation: Rolling mills are an example of non-linearly decreasing torque characteristics because torque and speed exhibits inversely proportional relationships and power are constant. Views: 16 Load torques can be classified into how many types?
Rolling mill coupling - All industrial manufacturers - Videos
Torque: 5.4 Nm - 352 Nm Rotational speed: 2,000 rad.min-1. MOM is an Oldham type flexible coupling. FCD400 is adopted in the spacer. Suitable for low-speed and high-torque specification. High performance grease is applied in the gap between hubs and the spacer in order to prevent ...
Which one of these motors is used for rolling mills, a DC ...
Answer (1 of 2): 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 of DC shunt motor is does...
Speed torque and power - Sample Essays
The speed of rollers in large rolling mills is an very important aspect to be measured. In this type of application the rpm of each motor is measured and compared to setpoints. ... Characteristics such as Speed, Torque, Power, operating voltage and current are important for selection of motors. Power is the capability of the motor to do some work.
PART II : ELECTRICAL DRIVES CHAPTER TEN
Speed-torque characteristics of the load must be known to calculate the acceleration time and to select the proper type of motor to suit the load. The load speed-torque characteristics of industrial loads are generally non- analytical function T L = f (ω). However, some of them may be approximated to an analytic form such as : 1- Constant ...
Rolling of Metals
Rolled Metal Characteristics • Residual stresses • Dimensional tolerances for cold-rolled sheet thicknesses +/- 0.1 mm to 0.35 mm (0.004 to 0.014 inch) • Flatness tolerances to within +/- 15 mm/m (3/16 inch/foot) for cold rolling, +/- 55 mm/m (5/8 inch/foot) for hot rolling • Hot rolling and sand casting produce similar ranges for
[Solved] Rolling mills exhibit what type of load torque ...
The range of horse power of electric motor drives for rolling mills is of the order of; Fan type of loads exhibits which type of load torque characteristics? has the least value of starting torque to full load torque ratio. Torque inversely varies with the speed in the windage load torque component.
excell sheet calculation torque speed power for rolling mill
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 (article) | Khan Academy
Torque is a measure of the force that can cause an object to rotate about an axis. Just as force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration. Torque is a vector quantity. The direction of the torque vector depends on the direction of the force on the axis.
(PDF) The Study of Continuous Rolling Mill Inter-stand ...
The paper verifies that the characteristics of the rolling mill including aligning ability depend on the rolling speed. ... The structure of the autom atic speed and motor torque control system ...
Compound Wound DC Motor or DC Compound Motor - The ...
In the below figure the torque-speed characteristics of this motor can be seen. ... It used in steel rolling mills. So that is a detailed post about Compound Dc Motor if you have any further query ask in the comments. Thanks for reading. Have a nice day. $2 for 1-4 Layer PCBs, three $8 Coupons for SMT assembly monthly ...
US4566299A - Control method and apparatus for rolling mill ...
The rolling torque calculating section 101 may be arranged to calculate the total torque according to the known rolling theory in the equal peripheral speed rolling operation on the basis of the rolling conditions such as characteristics of rolling mill, the entry and exit thickness of the rolled material, the rolling load, and the hardness of ...
UNIT1EDC.doc - UNIT-I CHARACTERISTICS OF DRIVES …
Load torque line in quadrants I and IV represents speed-torque characteristics of the loaded hoist. This torque is the difference of torques due to loaded hoist and counter weight. The load torque in quadrants II and III is the speed torque characteristics for an empty hoist. UNIT-I 1. 13
Characteristics of DC motors | electricaleasy
Characteristics 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 keeping the following two relations in mind.
Rolling Mill Horsepower Calculation
rolling mill speed calculation formula - ball mill,roller ... steel rolling mill speed calculation formula ... Online roll pass design software for rolling mills and . front of 13,000 hp variable speed motor on the hot mill. ... torque in rolling mills calculation formula with example.