Questions tagged [torque]

Torque is defined mathematically as the rate of change of angular momentum of an object (in physics it is called "net torque"). The definition of torque states that one or both of the angular velocity or the moment of inertia of an object are changing. Moment is the term used for the tendency of one force to rotate an object,but not necessarily to change the angular momentum of the object (the concept which is called torque in physics).

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536 views

Stepper motor holding torque without coils energized?

I want to know what torque a stepper motor can hold when stationary. They seem to only have one figure in specifications for holding torque which, I presume, is while coils are energised. How is ...
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105 views

What should be the angle of the motor to the base?

I have a boat that uses a propeler above the water. The propeler blows the wind to the back of the boat and it makes the boat go straight. There is one problem with this approach: I am using a big ...
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Calculation of Clamping force from bolt torque

I'm trying to calculate the clamping force resulting from torquing a nut and bolt to a particular level. I have found this formula in various forms in a lot of places. $$T = KDP$$ $T$ = Torque (in-...
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485 views

motion equation of rotor and stator

I have the situation from the following drawing: It represents a model for measuring the torque of a generator. There is an arm connected to stator and, the other end of the arm to a bending type ...
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1answer
788 views

Determine coefficients of friction based on the torque required to rotate a part on a shaft

I'm trying to model a part that rotates on a shaft. I measured empirically that it has a static torque of around 500 N·mm and a dynamic torque of around 400 N·mm. I want to simulate it in CAD but my ...
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2k views

How to Calculate Mean Radius of Irregular Contact Face (Torque Transmission)

In a simple situation, one simply takes the average of outer diameter and inner diameter to gain the mean radius for calculating torque transmission through a contact face, such as a clutch. But how ...
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97 views

Torque in different car gears?

Recently I have been researching torque and horsepower. I know that the lower the car gear, the more the torque. However, whenever I see specifications of a car, it says : X lb-ft of torque at Y ...
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1answer
71 views

Gear testing rig

I have two bevel small (POM) gears that I'd like to test. I'm hoping to test their strength and their maximum torque. One is 15-tooth and is around 16MM wide and the other is 45-tooth and is around ...
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7k views

What is the relationship between drive shaft diameter and torque output?

I have a DC motor with a shaft with a diameter of x. It would produce some torque T because torque is proportional to radius. If I stuck a pulley on the shaft of radius 2x, then I would produce twice ...
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610 views

Locking the shaft of a small fan-like setup

I have a fan-like setup where a 4 mm-thick rod is attached to a small motor-driven shaft (also 4 mm thick) such that the rod turns about its centre as the shaft turns: It's a closing mechanism for a ...
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1answer
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What determines the maximum torque of a DC motor?

What determines the maximum torque of a DC motor? How is this related to the equations $$E=k\omega$$ $$T=kI$$ where $E$ is electromagnetic force / voltage (V) $\omega$ is rotational speed (rad/s) $...
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Compound gear system ratio

This might be a stupid question, but I'm new to mechanics, so please bear with me. Suppose I have a compound gearing system defined in the image below (not to scale). The green gear is the driving ...
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How do I calculate the best mass for the highest linear speed?

I have a motor whose specifications say that its torque is 190g*cm. If I have the formula for the mass of the wheel vs radius, is there any way I can find the radius to get the best linear speed? The ...
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Calculate the force when given the moment [closed]

I'm not sure how to calculate force $P$ when the moment is a given with the force $P$ at an angle. I'm also having trouble breaking the moment into the $x$ and $y$ components.
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Torque requirement for the motor [closed]

I have a load of almost 15 kg. Both the pulley diameter = 0.6m Distance between the center of both the pulley is 0.8m. Loads are permanently attached to the belt. i will use a HTD belt for this ...
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2answers
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Why is there a moment at the cross section end when you cut a body?

I just started mechanics of materials, and it seems that my knowledge from statics has gotten rusty over the summer. But there was a new concept introduced in the first example problem today. There ...
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1answer
3k views

How to calculate if a motor is capable for a load?

I am trying to figure out if a motor I have is capable of spinning a wheel. Here is all of the information I have: MOTOR: 190 g.cm min. WHEEL: 26 cm diameter, weighs about 59 grams I imagine that I ...
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4answers
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What is the use of gears in a device with a fixed gear ratio?

From my understanding, there are two uses of a gearing system: to change the speed of output rotation (trading it with torque), and to change the axis of rotation. Now, in a car, for example, it is ...
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3answers
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What would happen if we tried to run a motor in space when it is not attached to anything to provide support to it?

I know that when a motor runs it generates torque and that torque can be used to do useful work. On the other hand, the motor needs strong support that absorbs the reaction torque. In our case let us ...
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2answers
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How do you calculate the best gear reduction for max speed?

I know that a gear reduction would decrease the RPM if the motor ran at constant speed, but in reality its speed is a function of the load. I first tried turning a wheel with a direct drive system, ...
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5answers
25k views

What is Starting Torque?

I'm having a hard time finding an answer from the internet. What does starting torque mean?
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Understanding required torque for a motor lifting a weight

This is a continuation of me trying to understand torque and stepper motors in my other question. I'm trying to understand the torque a motor would be required to generate to lift a small weight, and ...

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