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26 votes
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Understanding required torque for a motor lifting a weight

You have the right concept, but slipped a decimal point. 5 cm = 0.05 m. The gravitational force on your 450 g mass is 4.4 N as you say, so the torque just to keep up with gravity is (4.4 N)(0.05 m) =...
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12 votes
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How can I calculate the power and torque required for the motor on a wheeled robot/vehicle?

I laid everything out so you should only need to read it from top to bottom and look backwards for variables, never forward. I also tried to lay it out so hopefully you know where everything is coming ...
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10 votes

Calculation of Clamping force from bolt torque

That figure is about right for a low tensile bolt. See also this calculator and this table As a reality check if we approximate to a cross sectional area of 7 mm2 and a load of 1000 N that gives a ...
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10 votes
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How to calculate if a motor is capable for a load?

Check out my answer to a similar question at the Robotics SE. You are asking only about a motor and a wheel, and you do not give the weight of the vehicle (assuming there is one), so I cannot comment ...
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8 votes

What is Starting Torque?

There are two different aspects to start-up torque. One is associated with the motor and the other with the system which you are trying to drive. The start-up torque of a mechanical system is the ...
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7 votes
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Does a gear retain its mechanical advantage in a 1 2 1 ratio?

if you have them in line like the following picture then NO. The first and the last gear will have the same speed and the same torque (actually slightly less due to losses). if you wanted to retain a ...
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6 votes
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What is the relationship between drive shaft diameter and torque output?

No. Your basic problem is that "torque is proportional to radius" is wrong. Torque is the expression of normalized rotational force independent of radius. For example if a motor can deliver 10 Nm ...
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6 votes

What is the use of gears in a device with a fixed gear ratio?

A given mass of copper and iron can only produce so much torque : increasing torque further would require more current which means (a) the increased magnetic flux saturates the iron and (b) the I^2R ...
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  • 1,570
6 votes
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Why is there a moment at the cross section end when you cut a body?

To put it simply your loads are causing the beam/bar to bend right? So at the cut we need to consider the internal bending moment ($M$). Like you said: the professor has cut the bar to calculate the ...
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  • 1,217
6 votes

What is Starting Torque?

"Starting torque" and "locked-rotor torque" are the same thing. So if you run across the later term, you can treat it as a synonym for "starting torque." The NEMA MG-1 definition of locked-rotor ...
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  • 360
6 votes

What is Starting Torque?

Is the torque required to make something that is not turning start turning. You can think of starting torque as an instantaneous value (the torque just before the motor starts moving). You can also ...
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  • 356
6 votes

What is the use of gears in a device with a fixed gear ratio?

Electric motors typically only operate well at high speeds, and compared to something like an internal combustion engine, relatively low torque. Fixed gear ratios are used to cope with this inherent ...
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6 votes
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What is 'No Detent Torque'?

Detent torque is the torque while coils are not energised. Permanent magnets and the iron stator hold the motor in a given position without any power needing to be applied, although this force is ...
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  • 1,264
6 votes

Three-phase versus single-phase operation of a generator

But I'm thinking it may be better (more efficient maybe? less vibration maybe?) to run it in three-phase mode, with the load balanced among the three hot terminals. Correct. Figure 1. The load is ...
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6 votes

Ways to brake an axle

In the wire & cable business, the device you describe is called a dancer, for the way its components move about while regulating the tension in a rope or wire being unspooled from a large coil. ...
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6 votes
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Good estimates for torque generated while turning a dial

This a table of a search done on research that was conducted between June 1959 and October 1960 by the Controls Section, Engineering Psychology Branch, Behavioral Sciences Laboratory, 6570th Aerospace ...
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5 votes
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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?

Initially Assume an ideal motor with no mechanical losses and Operation in a perfect vacuum. Call the two portions rotor and stator - with all attached parts such as controller and power pack ...
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5 votes
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Why do drag race semi trucks slant to one side?

as the engine produces torque which is applied to the driveshaft, the engine block produces a counter-torque which must be blocked by bolting the block to the frame so the engine itself does not ...
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5 votes
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Gear acceleration and maintaining torque

Apart from frictional losses, which should be fairly low for a 1:4 ratio, the torque/speed ratio is inescapable ie if you increase the angular speed by a factor of 4 the torque must be reduced by a ...
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5 votes

torque for a machine shaft

$P$ is power. $P = \tau \omega$ $\tau = Torque$ $\omega = Angular Velocity (rad/s)$ https://byjus.com/physics/relation-between-torque-and-power/
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5 votes

Mechanical mechanism that regulates gear's rotational velocity

To my understanding the Hartnell governor is a variation that might be applicable to your needs. Figure : HArtnell Governor source mechoholic Essentially it moves the sleeve against a compression ...
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5 votes

Mechanical mechanism that regulates gear's rotational velocity

There are multiple things going on here. Your question indicates you have a variable input speed but want a constant output speed. The answer to this on its own would be a continuously variable ...
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4 votes

What would happen if we tried to run a motor in space when it is not attached to anything to provide support to it?

The stator and the rotor would rotate relative to each other in the same way as if one end were attached to the Earth. If your frame of reference was attached to either the stator or the rotor, you ...
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4 votes
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Compound gear system ratio

First, kg-cm is not a unit of torque. On the surface of the earth, your 10 kg-cm would actually be 98 N-cm, or 0.98 Nm. If these gears are on a satellite in space, then kg-cm for torque is ...
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4 votes
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Is twisted belt configuration a good practice?

The twist introduces a sideways torque, making the belt align non-uniformly, stretch and compress non-uniformly, and rub against any stops that prevent it from falling off (or be prone to fall off in ...
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  • 6,113
4 votes

Gear train with rack and pinion

It doesn’t really make much sense to talk about the torque of a rack for power transmission, since racks do not rotate but instead translate. Instead, it makes more sense to talk about the force of ...
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4 votes
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Calculate torque for a cam

Does this help? Take the [Angle] that's most prejudicial to opposing F, and consider the lever arm to the camshaft centre. It looks like my screen grab is the worst case scenario, but with the ...
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4 votes
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How can I accurately measure the actuation force of small buttons (<1cm diameter) using home equipment?

If you want a quick and somewhat inaccurate hill-billy engineering answer, I would take a digital kitchen scale and place the PSV ontop of it, tare it, then load up a program to test the buttons (game,...
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4 votes
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How does gear reduction affect a stepper motor's holding torque?

Yes, the holding torque goes up proportionally with the gear ratio. Plus the friction of the gear train, and any other seals, bearings along the gear train that add friction.
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