Hey. My project involves a motor which is driving a load of 20 kg through a pair of gears. A small gear of probably 100 mm diameter on the motor drives a big gear of 300 mm diameter. The load will be over the big gear. The motor provides azimuth movement to the load. I am a bit confused about the sizing of motor specifically the "torque"of motor. I have visited may pages about the torque calculation but they all calculate the torque with gravitational force keeping in the mind. In my case motor is not supposed to work against gravity instead it is supposed to provide enough torque to overcome the inertia and friction force. How to calculate the torque of motor in this case?
Please help . Thanks
Can you get your hands on a torque wrench? - Scotty
There is a suggestion for a simple way to measure torque in Stepper Motor Basics
...R
Friction you have to measure really - its not a well behaved thing. Inertia is easy:
torque = moment-of-inertia x angular acceleration.
Moment of inertia is simple to calculate for simple geometries, and generally its easy
to put an upper bound on.
hey scotty .thanks for responding
what is a torque wrench ?
Hey Robin 2 . thanks for responding
The link you have provided here does not explain much about the torque calculation though you have hyperlinked a reply #29 in "choosing motor and motor driver" .But You have explained the torque (torque drum) of the motor when motor is working against gravitational force.In my case the motor is driving load in xy-plane (azimuth movement). How can I calculate torque here?
nouman_naseer:
But You have explained the torque (torque drum) of the motor when motor is working against gravitational force.In my case the motor is driving load in xy-plane (azimuth movement). How can I calculate torque here?
I do realize that the torque calculation was only a very small part of the link.
The simple method I suggested can be used to measure torque on a "wheel" rotating in any plane - just run the thread over a suitable bearing so that it pulls straight from the wheel and falls straight to the weight.
...R
nouman_naseer:
hey scotty .thanks for responding
what is a torque wrench ?
Google is your friend.