### Why do some motors have constant load torque and some have

I am going to answer this question from the viewpoint of the use of three phase induction motors used on variable frequency drives (VFDs), in an industrial environment. These are the appliions where you need to have a good understanding of the

Get price### How to find the torque for a spiral and bowl for dough mixer

Nov 07, 2017 · Tell me how to find real torque for rotating spiral of dough mixer. We need to mix 25kg dough with adding water and Ingradients. Spiral made by ss rod of 25mm dia. Spiral dia is 250mm. Rotating speed is 250rpm(max). When start the machine rotate both spiral and bowl. Dough density appro 850kg/m^3

Get price### Variable Frequency Drives (VFD''s)

Variable Frequency Drives (VFD''s) • Popular speed control devices used in industrial, commercial TorqueSpeed Curve • Amount of Torque produced by motors varies with Speed. compressors, mixers and agitators. 10 Variable Torque Loads •Horsepower increases or

Get price### Synchronous Motor TorqueSpeed Characteristic Curve The

Oct 10, 2019 · Synchronous Motor TorqueSpeed Characteristic Curve. Synchronous motor provides power to such loads that operate at constant speed and system. Mostly this motor is connected with large power systems so these power system behaves like large infinity bus bars for motor and the variation in motor has no effect on these bus bars.

Get price### How to use a torquespeed curve to select a servo motor

Jun 14, 2019 · A servo motor''s torquespeed curve includes two operating zones: continuous duty and intermittent duty. To choose a motor that can meet the appliion requirements, it''s important to ensure the appliion runs within the continuous duty zone during normal operation and does not exceed the intermittent duty zone when peak torque is required.

Get price### 3: Torquespeed Curves AC Motor Designs Coursera

The slope of the torque/speed curve near the fullload torque indies the degree of speed regulation possible. The flatter the slope, the more that speed can be changed without changing the torque. The National Electrical Manufacturers Association, NEMA, or NEMA for short, defines threephase AC motor designs based on the torquespeed

Get price### Cone crusher torque speed curve Henan Mining Machinery

Cone crusher speed torque curve Crusher, quarry, m. simons cone crusher torque speed curve Crusher Machine The stone crushing plant which consists of jaw crusher, impactor crusher, cone crusher, VSI crusher and so on is widely adopted by panies in the field of road, bridge construction, aggregate production plants, mineral dressing plant and so on

Get price### Electrical Machines Induction Motor Torque Speed Curve

The Thevenin torque equation was used above to plot the torquespeed curve of an induction machine. Since the torque is given only as a function of slip, it is possible to use that equation to find the slip at which torque is a maximum. However, a mathematically simpler and intuitively clearer answer can be found be considering the power flow

Get price### Speed Torque Curve For A Raymond Mill greenrevolution

speed torque curve for a raymond mill – Grinding Mill China. Figure 2 The torque speed characteristic curve for a recent ball mill is shown in Figure troduction to bowl mills. In 1919 at combustion Engineering U.S.A., Raymond Mill on the top of the shaft rotates at a speed

Get price### Understanding DC Motors University of Minnesota

The point labeled as the operating point indies the speed the motor will run when driving a specific operating load. As that load changes, the operating point slides up and down the torquespeed curve. Notice how the torque speed curve is a straight line that connects the noload speed with the stall torque.

Get price### What is Engine Torque? It''s Characteristics & Formula

Mar 12, 2019 · Different engine designs/configurations develop different torque characteristics such as peak curve/flat curve.Most automotive engines produce useful torque output within a narrow band of the engine''s entire speed range. In petrol engines, it characteristically starts at around 10001200 rpm and reaching a peak in the range of 2,500–4,000 rpm. . Whereas in a diesel engine, it starts at

Get price### Torque Power and Speed A Special Relationship as explained

Torque Power and Speed A Special Relationship. OK, so we have got the maths out of the way but what does it really mean in practice and what is torque? Well, here goes, Torque is a twisting force applied to an object, like a fan or a conveyor shaft. The amazing thing is that you don''t need any motion for torque to

Get price### Torque Power and Speed A Special Relationship as explained

Torque Power and Speed A Special Relationship. OK, so we have got the maths out of the way but what does it really mean in practice and what is torque? Well, here goes, Torque is a twisting force applied to an object, like a fan or a conveyor shaft. The amazing thing is that you don''t need any motion for torque to

Get price### Mixing Chemical Processing Expert Forum: How Do I

The torque for the impeller is as follows: Torque [inchpounds] = 6.8x10^8 * visc * N * D^3 The torque is in inchpounds, the coefficient is 6.8 times 10 to the 8 power (0.000000068) includes your viscous power number, times the viscosity in centipoise, times the rotational speed in rpm, times the impeller diameter in inches cubed.

Get price### Electric Motors Power and Torque vs. Speed

Speed of electrical motors output power and torque . Electrical Motor Power, Velocity and Torque Equations. Torque in Imperial units can be calculated as. T inlb = P hp 63025 / n (1). where . T inlb = torque (in lb f). P hp = horsepower delivered by the electric motor (hp). n = revolution per minute (rpm)

Get price### Torque Curve for Carbureted 460 RV Motor 460 Ford Forum

Jul 14, 2011 · Inspecting the plotted curve, the torque rises linearly from 2750 to the max at 3400. There is a flat plateau from 3400 to 3850, at which point the torque decreases linearly to 4675. Measurements of engine rpm vs. real road velocity show that the engine torque max occurs at a real road speed of 71 mph in overdrive.

Get price### Mixing Chemical Processing Expert Forum: How Do I

The torque for the impeller is as follows: Torque [inchpounds] = 6.8x10^8 * visc * N * D^3 The torque is in inchpounds, the coefficient is 6.8 times 10 to the 8 power (0.000000068) includes your viscous power number, times the viscosity in centipoise, times the rotational speed in rpm, times the impeller diameter in inches cubed.

Get price### Measure Granulation Properties Mixer Torque Rheometer

The Caleva Mixer Torque Rheometer is well established as a valuable formulation development, formulation research and production quality control tool. It will uniquely provide you with quantitative and reproducible measurement of the rheology of a wet mass.

Get price### Servo Motor Torque Curve: What You Need to Know

Mar 20, 2018 · Note that the servo amplifier (aka servo drive) can limit the motor''s maximum operating parameters, so torquespeed curves are often developed for specific motoramplifier combinations. Using a different amplifier than that specified for the torquespeed curve could change the motor''s continuous and intermittent operation limits.

Get price### What is the difference between Variable Torque and

Typical appliions are: Traction drives, Compressors, Conveyors, Positive displacement pumps, Mixers and Hoists. As the speed changes, the load torque remains constant and the horsepower changes linearly with speed. Constant torque loads cause motors to draw relatively high current at low speeds when compared to variable torque appliions

Get price### Speed Torque Curves for Stepper Motors

Since the pullin torque curve for a stepper motor varies depends on the inertial load attached to the motor, the pullin torque curves are not shown in the speed – torque curves shown in alogs. In order to operate above the pullin torque curve, the motor must be accelerated into or

Get price### Cone crusher torque speed curve Henan Mining Machinery

Cone crusher speed torque curve Crusher, quarry, m. simons cone crusher torque speed curve Crusher Machine The stone crushing plant which consists of jaw crusher, impactor crusher, cone crusher, VSI crusher and so on is widely adopted by panies in the field of road, bridge construction, aggregate production plants, mineral dressing plant and so on

Get price### How to use a torquespeed curve to select a servo motor

Jun 14, 2019 · A servo motor''s torquespeed curve includes two operating zones: continuous duty and intermittent duty. To choose a motor that can meet the appliion requirements, it''s important to ensure the appliion runs within the continuous duty zone during normal operation and does not exceed the intermittent duty zone when peak torque is required.

Get price### What is the difference between the speed and the torque of

Speed is the rate at which the engine spins ( thats why the unit RPM rotations per minute ) Torque is how much twisting force the engine generates at its shaft for a particular speed of rotation ( Torque = Force x Perpendicular distance Unit

Get price### Torque Speed Curve Cone Crushers punicaoase

This torque at the motor''s shaft can result in a protects your machinery by controlling motor torque. poles once the motor is up to full speed. The logic Ramp profile (Linear, S curve, Squared). Start up Mixers and refiners. Crushers. Ball and hammer mills. Compressors. Chillers Accomodates Stress Cones. A409. Get Price

Get price### D.C. Motor Torque/Speed Curve Tutorial:::Understanding

In order to effectively design with D.C. motors, it is necessary to understand their characteristic curves. For every motor, there is a specific Torque/Speed curve and Power curve. The graph above shows a torque/speed curve of a typical D.C. motor. Note that torque is inversely proportioal to the speed

Get price### What Does Motor Speed Torque Curve Tell You? Rockwell

(0.4) 2 = 0.16, or 16% of Locked Rotor Torque is present. Now you look at a speed torque curve having a locked rotor torque compared to full running torque at 90%. If you reduce your voltage to 40%, as in the example, you now have 16% of the actual starting torque, which is pretty low. This value might not be enough to start the motor.

Get price### Rheometry Using the Caleva Mixer Torque Rheometer

Rheometry. Definition of Rheometer: Rheo flow properties of a material. Meter Rheometer. The Caleva Mixer Torque Rheometer is a useful research and quality control tool. The Mixer Torque Rheometer (MTR) is used for investigation of the properties of wet masses and the study of binder substrate interactions. Different Torque Curve for

Get price### Determination of shear rate and viscosity from batch mixer

A general analysis allowing the determination of shear rate and viscosity from batch mixer rotor speed and torque data is presented. The batch mixer was represented by two effective adjacent sets

Get price### Torque Equation and the Relationship with DC Motors

Mar 09, 2017 · The inverse relationship means that the torquespeed curve is a descending line, with a negative slope. The torquespeed curve begins at the crossing of the Y axis, where torque is maximum and speed is zero. This is the stall torque—the maximum torque when

Get price### Tutorial: Selecting an appropriate pump motor Machine Design

The bottom curve is the pump speedtorque curve with a closed valve until the pump accelerates fully. At that time the valve is opened and the pump requires its fullload torque from the motor.

Get price### Synchronous Motor TorqueSpeed Characteristic Curve The

Oct 10, 2019 · Synchronous Motor TorqueSpeed Characteristic Curve. Synchronous motor provides power to such loads that operate at constant speed and system. Mostly this motor is connected with large power systems so these power system behaves like large infinity bus bars for motor and the variation in motor has no effect on these bus bars.

Get price### Mixing 101: Torque and the Art of Mixing Dynamix Agitators

(0.4) 2 = 0.16, or 16% of Locked Rotor Torque is present. Now you look at a speed torque curve having a locked rotor torque compared to full running torque at 90%. If you reduce your voltage to 40%, as in the example, you now have 16% of the actual starting torque, which is pretty low. This value might not be enough to start the motor.

Get price### Power vs. Torque – xengineer

Full load torque and power curves highlight the maximum torque and power distribution through the whole range of engine speed. Image: Engine torque and power parameters at full load The shape of the above torque and power curves are not from a real engine, the scope being to

Get price### 2 winding motor torque speed curve (separate winding

I recently needed to use a two speed two winding motor (separate winding). I asked the motor manufacturer for a NEMA D motor, and they said that 2 winding motors do not come in a NEMA class but are rated as "2CT" or 2 speed Constant Torque. What is the Torque speed curve of a 2 speed motor that is considered "Constant Torque"?

Get price### Power vs. Torque – xengineer

Full load torque and power curves highlight the maximum torque and power distribution through the whole range of engine speed. Image: Engine torque and power parameters at full load The shape of the above torque and power curves are not from a real engine, the scope being to

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Torque Speed Curves One commonly used method of displaying motor characteristics graphically is the use of torque speed curves. While the use of torque speed curves is much more common in technical literature for larger DC machines than it is for small, ironless core devices, the technique is applicable in either case. Torque speed

Get price### What is the difference between Variable Torque and

Typical appliions are: Traction drives, Compressors, Conveyors, Positive displacement pumps, Mixers and Hoists. As the speed changes, the load torque remains constant and the horsepower changes linearly with speed. Constant torque loads cause motors to draw relatively high current at low speeds when compared to variable torque appliions

Get price### A.C. versus D.C. motor torque and horsepower Mike Holt''s

First off, a 8 pole AC induction motor would have a synchronous speed of 900RPM, not 800. So if you are looking at an 8 pole motor and the SLIP speed is 800RPM, that is a 12% slip motor, which is very high and might indie a Design D torque / speed curve which could provide very high Locked Rotor Torque.

Get price### Speed Torque Characteristics of Polyphase Electric Motors

The starting torque is indied on the torque/speed curve shown above. Pullup Torque (PUT) This term is used for the lowest point on the torque speed curve for an electric motor which is accelerating a load up to full speed. As the motor picks up speed, torque decreases slightly to the lowest point shown on the curve above.

Get price### Mixing 101: Torque and the Art of Mixing Dynamix Agitators

Oct 20, 2015 · Mixing 101: Torque and the Art of Mixing What is torque and what does it have to do with mixing? Selecting a mixer drive with a high horsepower rating doesn''t guarantee a satisfactory result in your appliion, and it doesn''t necessarily translate into a more powerful mixer either.

Get price### Understanding DC Motors University of Minnesota

The point labeled as the operating point indies the speed the motor will run when driving a specific operating load. As that load changes, the operating point slides up and down the torquespeed curve. Notice how the torque speed curve is a straight line that connects the noload speed with the stall torque.

Get price### Torque vs speed Physics Forums

Nov 11, 2009 · The torque/horsepower curve shows you the torque AFTER you take into account how much is needed to spin the engine. All losses, friction, internal, external, accesories, pumping, cooling, etc. are taken into account, and the torque number that you get is the NET torque.

Get price### How to read the Speed Torque Curve Mechanical

Nov 28, 2018 · In order to examine the speed torque curve of compressor and motor, the curve of compressor and motor, the compressor speed torque curve is superimposed on the motor speed torque curve (refer below figure). As we seen from the curve the motor speed torque curve at 80% voltage shall be minimum of 25% higher than the compressor curve.

Get price### Air motors

For this motor at maximum output the torque is 1.5 Nm and the speed is 1650 r/min. M 1 = desired torque n 1 Temperature= desired speed M 2 = torque at maximum output n 2 air motors can operate reliably in ambient tem = speed at maximum output Calculate the ratios M 1/M 2 and n 1/n 2 Therefore M 1/M 2 = 0.8 and n 1/n 2 = 0.7 Starting

Get price### Torque Curve for Carbureted 460 RV Motor 460 Ford Forum

Jul 14, 2011 · Inspecting the plotted curve, the torque rises linearly from 2750 to the max at 3400. There is a flat plateau from 3400 to 3850, at which point the torque decreases linearly to 4675. Measurements of engine rpm vs. real road velocity show that the engine torque max occurs at a real road speed of 71 mph in overdrive.

Get price### Electrical Machines Induction Motor Torque Speed Curve

The Thevenin torque equation was used above to plot the torquespeed curve of an induction machine. Since the torque is given only as a function of slip, it is possible to use that equation to find the slip at which torque is a maximum. However, a mathematically simpler and intuitively clearer answer can be found be considering the power flow

Get price### What is the difference between Variable Torque and

Typical appliions are: Traction drives, Compressors, Conveyors, Positive displacement pumps, Mixers and Hoists. As the speed changes, the load torque remains constant and the horsepower changes linearly with speed. Constant torque loads cause motors to draw relatively high current at low speeds when compared to variable torque appliions

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