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TORQUE–SPEED CHARACTERISTICS electric equipment

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

Dynamic characteristics of a rolling mill drive system

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.

Loads Types Electric Drives Questions and Answers

Nov 21, 2019 Explanation: Rolling mills are an example of non-linearly decreasing torque characteristics because torque and speed exhibits inversely proportional relationships and power are constant. 3. What is the relationship between torque and speed in constant type loads? a) Torque is independent of speed

MCQs of Induction Motor Drives (Power Electronics II

Rolling mills exhibit what type of load torque characteristics? (A) Constant torque characteristics (B) Linearly rising torque characteristics Torque inversely varies with the speed in the windage load torque component. (A)

torque caracteristic of ball mill

Ball mill drive motor choices artec machine 2017-2-23 the starting torque characteristic of this type of ball mill is not linear figure 2 shows the graph of mill speed versus torque requirement: figure 2 the graph clearly shows that the torque requirement exceeds 120% at 80% speed

Development of Hydraulic Expansion Type Torque Limiter for

The basic structure of a rolling mill is shown in Fig. 1. Due to the operational characteristics of rolling mills, it is not possible to prevent torques that exceed the capacity of the UJ during operation. When the multiple in-take of rolled material happens during rolling operation, an

Method of load calculation of electrical drives of rolling

Results of calculations and experimental studies of rolling torque in rolling mill 5000. Minimum speed limit of 2000 mill electric drives during tube shell rolling. Jan 2011;

Torque In Rolling Mills Calculation Formula With Example

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 132. Effect of rolling speed on the relationship.and supply aluminum hot rolling mill

Rolling mills SlideShare

Jul 20, 2016 o Rolling is used mainly to produce sheet of metal o or simple cross sections, such as rail tracks. o a drive (motor) for applying power to the rolls and controlling the speed o rolling mills are one of the most demanding applications for motor drives o Typical motor sizes for modern rolling mills is 600kW to 1200kW

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.

Commentary ÔClassification and Characteristics of Rolling

ÔClassification and Characteristics of Rolling Bearings ÔClassification and Characteristics of Rolling Bearings A-4 A-5 1.1 Structure Most rolling bearings consist of rings with a raceway (inner ring and outer ring), rolling elements (either balls or rollers) and a cage as shown in Fig. 1.1 (Figs. A to H). The cage

(PDF) Transient Torsional Vibrations Control in the Geared

A comparison of relevant dynamic and control parameters for speed controlled drives on rolling mills indicates that a significant deterioration of control characteristics need not be expected when

Nonlinear torsional vibration dynamics behaviors of

Jan 01, 2014 The self-excited vibration of hot strip mill was studied, and the variation of the rolling torque caused by rolling speed was obtained [4]. A method for calculating the steady-state response of the self-excited vibration was presented, and the relationship between the system parameters and the self-excited vibration was analyzed [5].

Development of Hydraulic Expansion Type Torque Limiter for

The basic structure of a rolling mill is shown in Fig. 1. Due to the operational characteristics of rolling mills, it is not possible to prevent torques that exceed the capacity of the UJ during operation. When the multiple in-take of rolled material happens during rolling operation, an

Torque In Rolling Mills Calculation Formula With Example

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 132. Effect of rolling speed on the relationship.and supply aluminum hot rolling mill

Torque Speed Characteristics Of Machine

Torque Speed Characteristics of Induction Motor. Figure 1 showed a plot of induction motor torque vs speed from zero to synchronous speed. This curve is called the torque-speed characteristic curve. We can derive an equation from the equivalent circuit that allows the calculation of the torque

Rolling mills SlideShare

Jul 20, 2016 o Rolling is used mainly to produce sheet of metal o or simple cross sections, such as rail tracks. o a drive (motor) for applying power to the rolls and controlling the speed o rolling mills are one of the most demanding applications for motor drives o Typical motor sizes for modern rolling mills is 600kW to 1200kW

Rolling processes Al-Mustansiriya University

Rolling processes 5-1 introduction: Rolling is the process of reducing the thickness or changing the cross section of a long workpiece by compressive forces applied through a set of rolls, as shown in figure (5-1). Fig. (5-1) Most rolling is carried out by hot working, called hot rolling, owing to the large amount of deformation required.

ELECTRICAL DRIVES & CONTROL

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

12 Basic Motor Types Used For Industrial Electric Drives EEP

Jul 04, 2020 7. Slip Ring Induction Motor. It has high starting torque and large overload capacity. 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.

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.

Characteristics of DC motors electricaleasy

And hence, speed is low which results in decreased back emf Eb. Due to decreased Eb, more armature current is allowed. Speed vs. torque (N-Ta) This characteristic is also called as mechanical characteristic. From the above two characteristics of DC series motor, it can be found that when speed is high, torque is low and vice versa.

The characteristics of high speed wire rod rolling mill

Bearing Manufacturer In China Leader Since 1995, Roller Bearing Ball Bearing / WXING Bearing

Excell Sheet Calculation Torque Speed Power For Rolling Mill

Rolling speed V2 in all analysed roughing mills and same trend as the torque M. figure 3. Rolling speed mill is inverse to rolling speed. screw conveyor power calculation formula Newest Crusher

Advanced technologies for a new 20-roll mill stand

thickness between 0.2 to 2.5 mm, at a rolling speed of max. 800 m/min. It processes coils weighing up to 30 t. ABB sets standards in the automation of stainless-steel mill stands For this cold rolling mill,

Commentary ÔClassification and Characteristics of Rolling

ÔClassification and Characteristics of Rolling Bearings ÔClassification and Characteristics of Rolling Bearings A-4 A-5 1.1 Structure Most rolling bearings consist of rings with a raceway (inner ring and outer ring), rolling

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.

Torque In Rolling Mills Calculation Formula With Example

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 132. Effect of rolling speed on the relationship.and supply aluminum hot rolling mill

Electric Motor Interview Viva Questions and Answers

Jul 24, 2019 What are the characteristics of a DC motor? Torque vs Armature current characteristics It is a characteristic curve between torque Ta and armature current Ia (Ta/Ia). Compound motors used for higher starting torque and almost constant speed Presses, Shears, Rolling Mills

Characteristics of DC motors electricaleasy

And hence, speed is low which results in decreased back emf Eb. Due to decreased Eb, more armature current is allowed. Speed vs. torque (N-Ta) This characteristic is also called as mechanical characteristic. From the above two characteristics of DC series motor, it can be found that when speed is high, torque

ELECTRICAL DRIVES & CONTROL

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

SUBJECT NAME: ELECTRICAL DRIVES AND CONTROL SUBJECT

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

TORQUEMON INLINE TORQUE MEASUREMENT FOR

damage is related to the torque and a difference in speed between the work rolls. method of measuring the torque of rolling mill spindles. It offers a permanent, real-time measurement based on the and/or demonstrate respective characteristics

Dynamics of rolling mill drive system considering arc

Jul 10, 2019 The arc tooth gear spindle (ATGS) is the key structure of the drive system of hot finishing rolling mills. To investigate the dynamic characteristics of ATGS of the drive system of hot finishing rolling mills, a dynamic mechanical model of ATGS was established. The influences of dynamic displacement and dynamic torque on dynamic load (meshing force, additional torque and friction torque

UNIT-I CONTROL OF DC MOTORS THROUGH PHJASE

2. They are available in wide range of torque, speed and power. 3. They are adaptable to almost any operating conditions such as explosive and radioactive environments 4. It can operate in all the four quadrants of speed-torque

DC Shunt Motors: Characteristics, Electric Braking

Speed-torque characteristics under dynamic braking This method is commonly used for Printing presses, elevators, rolling mills and machine tools. Plugging is executed at a time when the motor is operating at the point E characteristics A for a load torque