18 · electric vehicles, in steel and aluminum rolling mills, electric trains, overhead cranes, control devices, etc. • Biggest advantage over other motors – Torque-speed characteristics of dc motors can be varied over a wide range while retaining high efficiency. Faraday’s Law If a flux passes through a turn of coil of wire, a voltage will be

Get price21 · The speed of slip ring induction motor can be changed up to 50% of its normal speed. Slip ring induction motor is used for those industrial drives which require high starting torque and speed control such as lifts, pumps, winding machines, printing presses, line shafts, elevators and compressors etc.

Get price15 · As regards “abnormal” rolling conditions - which are more or less very “normal” for rolling mills - roll damage often occurs with consequences for the …

Get price18 · 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.

Get pricetorque 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 …

Get priceThe selection of low voltage variable speed motor drives for long product rolling mills is discussed. The motor drives are controlled by a sophisticated cascade, tension or loop control system ...

Get price18 · 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 ...

Get priceGenerally, 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...

Get priceWorkroll life of hot rolling mills is strongly affected by roll material. Recently, high-carbon high speed steel rolls have beendeveloped to improve further work roll life. In this paper, relationship between basic characteristics of roll and microstructure in high-carbon high speed steels were investigated.

Get price4 · Total roll torque consists of the rolling torque plus the torque required to overcome friction in roll bearings plus torque at motor shaft plus torque for ... Production of continuous sheets and strips is one of the attractive features of modern rolling mills. However, control of sheet thickness and cross-section is a real challenge. In order to

Get pricesteel rolling mills, electric cranes, and robotic ... at rated value [2, 3]. The desired torque-speed characteristics could be achieved by the use of ... Plot of Angular Speed VS Torque Load

Get price27 · in rolling mills, machine tools, cutting tools, overhead cranes and other industries application which require large starting torque. DC machine is highly versatile & flexible machine. They also employ in many cutting application such as actuators & speed or sensors that is DC motor are very versatile for the purpose

Get priceDynamic characteristics of a rolling mill drive system ... · 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 ...

Get priceNature of speed torque characteristics, speed regulation, speed range, efficiency, duty cycle . process rolling mills, paper and textile industries, >>Get Price; torque speed characteristics of rolling mills pertec. torque caracteristic of ball mill grinding mill equipment Dynamic Estimation of Electrical Demand in Hot Rolling pdf from both the ...

Get price15 · As regards “abnormal” rolling conditions - which are more or less very “normal” for rolling mills - roll damage often occurs with consequences for the …

Get priceApplication 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?

Get priceThe 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.

Get price27 · introduction theory of plasticity rolling mill rolling forces tribology mathematical modeling of rolling temperature effects on rolling recrystallization roll torque roll power influence of physical quantities other types of rolling –temper, acumulative, flexible results and future comparison computational simulation conclusions

Get priceSpecial and custommade motors for hot rolling mills are manufactured by our subsidiary indar.The motors required for the steel industry, are machines incorporated with high torque and variable speed characteristics.With this purpose in mind the manufacturing program includes low speed synchronous motors controlled by cycloconverter fed units.

Get priceStarting torque of IM can be increased by using external rotor Resistance at starting, but in case of squirrel cage motor, adding external Resistance to rotor circuit is not Possible. High starting torque in squirrel cage IM is obtained by using D...

Get priceDynamic characteristics of a rolling mill drive system with backlash in rolling slippage. ... rolling speed and torque amplification factor associated with the self-excited vibration is also derived. The research may provide a valuable way to avoid self-excited vibration and thus prevent the system from instantaneous breakage. ... the carrying ...

Get price18 · 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.

Get priceFrom 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.

Get price20 · (Direct Torque Control that’s gives an optimally fast torque control we are introducing RMD (Rolling Mill Drive) control, which replaces the conventional PI-speed control and conventional feed forward control techniques. The result is that we now can offer an optimally fast speed control based on the characteristics of the mechanical drive train.

Get priceIn this paper, a new specific roll pressure formula is derived from the Navier-Stokes equation (N-S equation) by the hydrodynamics method (HM) with assumptions that strip materials take the characteristics of viscous fluid during plastic deformation of hot rolling processes.

Get price24 · 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.

Get price27 · 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 …

Get priceFind out all of the information about the Howdon Torque limiters product: flexible coupling / for rolling mills / for shafts / transmission NFS. Contact a supplier or the parent company directly to get a quote or to find out a price or your closest point of sale.

Get priceThe Use of Frequency Characteristics for Interconnected Drive of Rolling Mill Modes Research ... The investigation outcome may be used at designing tension regulators for continuous rolling mills. Previous ... The frequency response characteristics obtained give evidence that at the use of the system stabilizing motor torque with change of the ...

Get price27 · introduction theory of plasticity rolling mill rolling forces tribology mathematical modeling of rolling temperature effects on rolling recrystallization roll torque roll power influence of physical quantities other types of rolling –temper, acumulative, flexible results and future comparison computational simulation conclusions

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