torque speed characteristics of rolling mills

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UNIT1 Drive Characteristics DEFINITION

ii) Torque proportional to speed (generator type load) The speed torque characteristics for this type of load is given by T=K Machines used for shaping, cutting, grinding or shearing requires constant torque irrespective of speed. Similarly cranes during the hoisting and conveyors handling constant weight also exhibits same characteristics The speed torque characteristics for this type of load is given by T α ω .


motor is imparted speedtorque characteristics required by the load . During transient operation, such as starting, braking and speed reversal, it restricts source and motor currents with in permissible limits. It converts electrical energy of the source in the form of suitable to the motor

how to calculate load on the sheet in cold rolling mill ...

Jun 18, 2019· The Calculation Roll Force Torque in SAGE PublicationsThe Calculation of Roll Force and Torque in Hot Rollina Mills b I By R. B. Sims, (Associate Member)* Equations are derived for the ...

DC motors advantages and disadvantages over AC motors ...

This is one of the main applications in which dc motors are widely used in fine speed applications such as in rolling mills and in paper mills. High starting torque: dc series motors are termed as best suited drives for electrical traction applications used for driving heavy loads in starting conditions.

International Rolling Mills

Touch screen will display torque on universals, load on mill heads, mill speed, mill load in amps, and roll temperatures. 50,000 LBS load cells will be installed in each mill head. 10 K torque cells will be installed in top and bottom universals.

Design and Selection of High Reliability Converters for ...

Apr 20, 2018· Rolling mills must be able to change the speed of the strip at the same time that the speed is controlled within precise limits. Furthermore, this application has a severe load profile, with high torque variations during the lamination process.

(PDF) Electrical Drives | Suresh Muthusamy

This angle is known as firing angle. 15. Give some applications of phase control converters. Phase control converters are used in the speed control of fractional kW dc motors as well as in large motors employed in variable speed reversing drives for rolling mills. With motors ratings as .


14. Explain about the speedtorque characteristics of a DC Compound Motor with suitable graph and equations. (16) 15. A 220V shunt Motor has an armature resistance of Ω and with full field has an emf of 215V at a speed of 960 rpm, the motor is driving an overhauling load with a torque of 172 Nm.

Use Of Torque Arm In Vertical Roller Mills

functio of vertical roller mills in cement industry. torque speed characteristics of vertical raw vertical grinding mill lm. ultra wet grinder prices in hyderabad. sayaji stone crusher plant suppliers in .

Difference Between AC and DC Motors | Precision Electric ...

The AC electric motor's rotor rotates inside the electric motor's coils and is attached to an output shaft that produces torque by the rotating magnetic field. There are two different types of AC electric motors and each of them uses a different type of rotor.

For every destination, the optimum drive

Closedloop speed/ torque control Rolling mill drives, wiredrawing machines, extruders and kneaders, cable railways and lifts, test stand drives Pumps, fans, compressors, mixers, extruders, crushers, rolling mill lines, mine hoist drives, excavators, test stands, ship's drives, conveyor belts, blast furnace blowers Test stands, crosscutters,

III. Synchronous Motors

torque for motor starting. Synchronous motors will run at synchronous speed in accordance with the formula: Example: the speed of a 24 Pole Synchronous Mot or operating at 60 Hz would be: 120 x 60 / 24 = 7200 / 24 = 300 RPM . Synchronous Motor Operation The squirrelcage Amortisseur winding in the rotor produces Starting

A Robust MPC Design for Hot Rolling Mills: A Polyhedral ...

reversing roughing mills which reduce the thickness of bars to around 30 mm. Then, the strip is further rolled by finishing mills composed of typically six or seven rolling stands. The rolled strip is cooled down by spraying water in a run–out table and coiled by a down coiler. The most important control problems in .

Designing of Hot Strip Rolling Mill Control System

The tension value of Ut of hot roll strip mill. Strip width (mm) h ≤ < h ≤ < h ≤ < h Unit tension (MPa) where σ is yield stress. Yield torque which strip bending deformation needed occupies a larger proportion in the total output torque.

Principles and Applications of Metal Rolling Assets

Principles and Applications of Metal Rolling This is a book written by a practitioner. It is somewhat different from a normal textbook involving machines and .

Fundamentals of Roll Cooling and Control of Flatness at ...

Roll Bite temperatures in slower heavily drafted stands can peak in the region of 300oC, diminishing with the reducing thickness and increasing speed in the downstream mill stands. In general the Temperature parameters are dependent on drafting, steel grade, gauge and width.