# How to calculate Torque for motor?

1. Dec 25, 2012

### zaki4484

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!

2. Dec 25, 2012

### Staff: Mentor

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).

3. Dec 25, 2012

### zaki4484

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 video , 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.

Last edited by a moderator: Sep 25, 2014
4. Dec 25, 2012

### Staff: Mentor

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.