Continue to Site

Welcome to 3DCADForums

Join our CAD community forums where over 25,000 users interact to solve day to day problems and share ideas. We encourage you to visit, invite you to participate and look forward to your input and opinions. Acrobat 3D, AutoCAD, Catia, Inventor, IronCAD, Creo, Pro/ENGINEER, Solid Edge, SolidWorks, and others.

torque calculation



I'm trying to calculate the torque of my model so i can correctly spec a motor to rotate it. As we all know, t=Ia where 't' is torque, 'I' is moment of inertia, and 'a' is the angular acceleration.

The mass is going inside a torque motor... think of the motor as a donut and the mass as a munchkin spinning in the middle, however the mass is not symmetric.

Center of mass: ( millimeters )
X = 0.1283
Y = 3.6911
Z = 0.4753

I have centered the model such that it will rotate at the output coordinate system about the Y axis like it would in real life.

Moments of inertia: ( grams * square millimeters )
Taken at the center of mass and aligned with the output coordinate system.
Lxx = 9009.2180 Lxy = 116.3216 Lxz = -179.7757
Lyx = 116.3216 Lyy = 9102.2187 Lyz = 86.0433
Lzx = -179.7757 Lzy = 86.0433 Lzz = 10804.8404

What values do I use to calculate the torque?! What is their naming convention for their variables?!

NOTE: The velocity is going to be 120 RPM, but I haven't yet figured out the actual acceleration.
Use the center of mass if it's only for the rotating part.
Quick math puts your CG ~.483 off axis, so now you have mass & radius

Articles From 3DCAD World