# Torque & Speed Relation

Discussion in 'Mechanical | Automobile | Aeronautics' started by Umamageswari, Dec 25, 2011.

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## Anyone knows the torque structure ?relation between the speed and torque?

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### UmamageswariCertified CEan

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Anyone knows the torque structure ?relation between the speed and torque?

### ReyaApprentice

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Torque and speed are inversely proportional. why did you give 5 and 3 as options? what does it mean?

### RRITESHCertified CEan

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### veereshsgCertified CEan

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Torque can be increased at the cost of speed.

### S.mukherjeeCertified CEan

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at a constant power output torque is inversely to speed. if power is increasing torque or speed or both can increase significantly.
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### CE DesignerAce

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For any rotating machine:
Torque is propotional to the power but,
inversley proportional to velocity.
If you need more information with regard to application please say.

### Abhilash T AntoCertified CEan

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at constant power ,speed is inversly propo to torque.. P=2*pi*N*T/60..

### antuan.oCertified CEan

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So torque is inversly to speed? Could you explain your formula please. Why /60 ?

### N.Gowtham RajEnthusiast

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/60 is for N.....
N is revolutions per minute
But T is in seconds
So , we convert rpm(revolutions per minute) in to rps(revolutions per second) dividing it by 60...

### N.Gowtham RajEnthusiast

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Torque is the load carrying capacity in crude words...
More over the best example for demonstrating the difference is

1. BENZ car- High speed, Less torque(Load carrying capacity- 4+1 people)
2. BUS - Low speed , High Torque(High load carrying capacity-55 + 2 people)
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### Al-OtaibyCertified CEan

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Power[kw]
={torque[N-m]*pi*rotational speed in RPM }/30000

Power[kw]*30000
=torque[N-m]*pi*rotational speed in RPM

TORQUE
={Power[kw]*30000}/pi*rotational speed in RPM

From the above formula,it is clear that torque decreases with speed in Torque vs speed curves.

Source: http://en.wikipedia.org/wiki/Torque

### zaveriStar

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in even more simple words,

speed : it is merely the number of rotations of a wheel or gear per second or per minute or per unit time.

torque : it is the leverage applied to rotate a circular machine member . it is the product of the force applied on a wheel to rotate it and the diameter of the wheel.

thus greater the diameter of the wheel , the lesser the force that can be applied.

and thus when the diameter of the wheel increases its speed decreases

hence torque and speed are inversely proportional