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How to calculate Torque for motor?

by zaki4484
Tags: motor, torque
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zaki4484
#1
Dec25-12, 08:02 AM
P: 2
Hi,
I am doing a self-balancing skateboard. It uses two 24v motor to move two wheels.
I need to know if my motor will be able to move the wheels.

Given that,
wheel of 5.66 inches.
The total weight of the skateboard = 13kg.
Assume human mass = 80kg.
Total weight with human mass = 93kg.

How to know the torque to move each wheel?

Thanks!
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mfb
#2
Dec25-12, 09:11 AM
Mentor
P: 11,925
Can you provide a sketch of the setup? Something similar to a segway?
Where do you expect torque? If I understand your setup correctly, it depends on the maximal imbalance you get.

In any way, you can estimate the order of magnitude (but not a precise value) with (wheel radius)*(mass)*(gravitational acceleration).
zaki4484
#3
Dec25-12, 09:37 AM
P: 2
Almost similar to segway only that this project uses hand controller.

I don't have sketch of the setup. But if you look at this videohttp://www.youtube.com/watch?v=engi16bLJe0 , I think you can see the setup of the motor to the wheel.

I only need to know how much torque is needed for the motor to move the wheel.

mfb
#4
Dec25-12, 09:51 AM
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P: 11,925
How to calculate Torque for motor?

I see three reasons to need torque:
- balancing. Depends on the quality of your balancing. Better (quicker, finer) -> less torque
- acceleration. Accelerating 93kg with 1m/s^2 needs 93N, for example, divide that by your wheel radius to get torque for both wheels together.
- angular acceleration. I would expect that this is negligible.


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