2021-9-15 · 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 …

2019-9-27 · 1.Torque and armature current characteristics: In case of a series motor, the series field winding is carrying the entire armature current. Flux produced is proportional to the armature current. The torque in case of a dc series motor is proportional to the square of the armature current. This relation is parabolic in nature as shown in the figure.

2021-9-6 · FIGURE 1 Induction motor torque-speed characteristic curves.. Figure 2 showed the equivalent circuit for the stator. We can simplify our calculations by replacing it with a Thevenin''s equivalent so that we do not have parallel …

The speed of an electric motor is measured in revolutions per minute, or RPM. Torque: The torque output of a motor is the amount of rotational force that the motor develops. The torque of a small electric motor is commonly measured in …

2018-8-13 · Mechanical characteristics- speed- torque characteristics of various types of load and drive motors - braking of electrical motors-dc motors: shunt, series, compound motors-single phase and three phase induction motors Unit-III Starting methods Types of d.c motor starters-typical control circuits for shunt and series motors-three phase squirrel ...

2021-3-1 · 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 ...

torque speed characteristics of vertical raw mill WIND TURBINE POWER, ENERGY, AND TORQUE Performance characteristics such as power output versus wind speed or versus rotor angular velocity must be optimized in ...

2017-6-19 · The design of the long product rolling mill is required to provide right solutions for the required performance requirements which include high speed production, microstructure qualities of the product, and shortest changeover time from one product to other product etc. Large amount of flexibility is available in modern long products rolling mills.

It has a very high starting torque. Hence it is used for heavy-duty applications such as electric railways, mine hoists, continuous conveyors cranes, 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.

2021-2-16 · tension, speed Roll force, torque, temperature CVC, HS, position bending Coil-data Operator-trims Scheduling 400 350 300 250 200 150 100 50 0 0 0.5 1 1.5 2 Log deformation Yield stress 3542 Rolling mill applications covered by ABB include: Single and multistand Mills Cluster and Sendzimir*) Mills Inline and continuous rolling mills Reversing ...

The rolling mill examined is reversible and equipped with an independent speed control system for each work roll (two single-input single-output systems). ... The speed and torque waveforms are ...

2020-4-9 · the steady-state region of each pass. The roll force and roll torque are the main parame-ters in controlling the ﬂatness and geometrical accuracy, yield strength and the hardness of the product, the mill stretch and vibrations of the rolling mill, and roll ﬂattening (Lenard, 2002).

2021-9-24 · The speed – torque characteristics of this type of load is given by . Torque inversely propositional to speed: · In such types of loads, torque is inversely proportional to speed or load power remains constant. · Eq: Lathes, boring m/cs, milling m/cs, steel mill colier and electric traction load. · This type of characteristics …

2018-1-30 · 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 source:

2019-2-4 · POWER IN 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 point along the arc of contact ata distance ''a'' from the line of centers of the rolls.

2020-6-5 · 14. Explain about the speed-torque characteristics of a DC Compound Motor with suitable graph and equations. (16) 15. A 220V shunt Motor has an armature resistance of 0.062 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.

2001-1-1 · 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.

According to the rolling slippage of a rolling mill drive train with backlash, the present authors have established a universal non-linear mathematical model for the drive system and used the Krilov–Bogolubov method to solve it, having ascertained the conditions of the self-excited vibration being aroused such as the relationship of rolling normal force and rolling speed, and …

2016-2-25 · If a mill rolls 80 % of the calendar year, that is 365 x 24 x 0.80 = 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of 114.16 tons/hour. If the ...

· A hoisting speed of 0.5 m/s corresponds to a drum speed of 19 rev/min, so a suitable gear ratio would be say 80:1, giving a maximum motor speed of 1520 rev/min. The load torque, as seen at the motor side of the gearbox, will be reduced by a factor of 80, from 2500 to 31 Nm at the motor. We must also allow for friction in the gearbox, equivalent ...

ISIJ International, Vol. 32 (1 992), No. 11, pp. 1184-1189 Basic Speed Characteristics and Microstructure Steel Rolls for Hot Rolling Mill of High-carbon High Kunio GOTO.Yukio MATSUDA.1)Kohichi SAKAMOTO1)andYoshihito SUGIMOT02) lron &Steel Research Laboratories. SumitomoMetal Industries. Ltd., Fuso-cho. Amagasaki. Hyogo-ken,660Japan. …

5. Cluster Rolling Mills: In this type of rolling mill, there are two basic roles that are backed up by two or more rolls which are bigger than those two basic rolls. These backed up rolls give more pressure to the basic rolls to heavily press the strip.

2021-2-24 · 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.

Ward-Leonard system of system of speed control is not recommended.... Reducing the field current will give us _____ Rolling mills exhibit what type of load torque characteristics? The Speed control by variation of field flux results in.... An infinite bus-bar has _____ The position and velocity errors of a type-2 system are....

Rolling Mill Speed Calculation ... roll force, torque, power during steel rolling mill ... be a rolled carpet or a rolled sheet of paper from the paper mill. Rolling conditions in hot strip mills …

2015-11-27 · If a mill rolls 80 % of the calendar year, that is 365 x 24 x 0.80 = 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of 114.16 tons/hour. If the utilization can be improved by 1 %, the available rolling hours is 365 x 24 x 0.81 = 7096.6, creating 87.6 extra rolling hours.