# How to calculate torque for a motor?

• fkneg12
In summary, the conversation discusses how to determine the necessary torque motor for lifting a certain weight. It is mentioned that the diameter of the drum used for winding the cable is a factor in calculating torque. The formula for calculating torque in shafts is also mentioned.
fkneg12
Hi all,

Just wondering how to work out what torque motor we need to get to lift a certain (as yet undetermined) weight.
Is there a formula to work out what torque we need once we know the weight?

It depends on the diameter of the drum that you are winding your cable onto. If you had a weight of 1 Kg (1 N) and a dia of 1 meter youd need a minimum torque of 1NM.

Torque is Force X Displacement. So you could calculate your force using Newtons equations of motion to get your missing variable like velocity if needed. Or you could just assume a height and multiply by gravity. that will give you force. This however is also assuming a 0 angle in the lift.

If you want to calculate torque which occurs in shafts, you have to use this formula;
P=2* (pi) * f *T
T is torque (Newton*meter)
P is power (Watt)
pi = 3,1415...
f is frequency of rotation (1/s = Hz)
sometimes you can find revolution as rpm. So you have to change rpm to frequency.
(1 Hz = 60 rpm)

## What is torque and why is it important for motors?

Torque is a measure of the rotational force or strength of a motor. It is important for motors because it determines the amount of work that can be done and the speed at which the motor can operate.

## How do you calculate torque for a motor?

To calculate torque for a motor, you need to know the force applied to the motor and the distance from the center of rotation to where the force is applied. Torque is calculated by multiplying the force by the distance.

## What is the unit of measurement for torque?

The unit of measurement for torque is Newton-meters (Nm) in the SI system or pound-feet (lb-ft) in the imperial system.

## How does torque affect the performance of a motor?

Torque directly affects the performance of a motor. A higher torque allows a motor to produce more power and operate at higher speeds, while a lower torque may result in slower speeds and reduced power output.

## Can you change the torque of a motor?

The torque of a motor is determined by its design and cannot be changed. However, by changing the voltage or current supplied to the motor, you can indirectly affect the torque and ultimately the performance of the motor.

Replies
9
Views
390
Replies
6
Views
2K
Replies
2
Views
2K
Replies
5
Views
1K
Replies
5
Views
1K
Replies
22
Views
596
Replies
17
Views
3K
Replies
6
Views
2K
Replies
3
Views
1K
Replies
8
Views
1K