April 8, 2020 at 10:01 amAliosha86Subscriber
I am dealing with some torque evaluation. Can someone explain to me how Ansys Maxwell evaluates the torque choosing It as a parameter?
Which formula does Ansys use? Moreover, this torque parameter can be used only when dealing with motors, or for other general cases?
Thank you very much
April 8, 2020 at 12:21 pmSadeghSubscriber
for calculating torque which is applied to an object (for example a rotor) you can simply select the object, right click --> then choose assign parameter then choose torque. after analyzing, in the project manager window from results-->solution data you can see the calculated torque. or you can plot torque relative to other variables.
I am not sure how it calculates the torque but I compared the result of calculated torque with another result which I calculated by electromagnetic torque formula, and they were identical.
and finally, you can assign parameters (torque) to any object other than motors.
April 8, 2020 at 12:30 pmAliosha86Subscriber
Thank you Sader for your answer. I really appreciate. In the parameter you can have also the Force evaluated directly by Ansys. Do you know in which position this force is applied? the center of gravity of the body?
April 9, 2020 at 12:10 pmSadeghSubscriber
since it is based on finite element, I think it calculates all the forces vector which is applied to the whole body of the object and then sum up those vectors then find resultant vectors toward x ,y or z
but if you want to find out how much force is applied to a particular part of an object you would better use ansys work bench , I think it will show the force field and you can find out how much force is applied to a specific part of an object
April 13, 2020 at 2:31 pmPaul LarsenAnsys Employee
The torque parameter is created with respect to a selected axis, so the torque is calculated with respect to the selected axis. If you have a net side-ways force on an object, and you move the relative coordinate system further away, causing the torque lever-arm to increase (even moving the coordinate system outside the simulation domain), you can see the torque change because the selected axis is at an increased location w.r.t. the net force on the object.
The force/torque parameters are calculated by default with virtual work method. We calculate the magnetic energy/coenergy in the simulation, and then evaluate the virtual change in co/energy at the surfaces of the selected objects as if the mesh had moved. So, the force calculation is like dW/dx (but for all 3 X,Y,Z directions), and the torque calculation is like dW/dtheta, where theta is the angle of rotation w.r.t. the selected axis.
April 13, 2020 at 2:40 pmAliosha86Subscriber
Thank you Sadegh, I was of your same idea.
April 13, 2020 at 2:42 pmAliosha86Subscriber
Thank you very much pblarsen for your explanation. Now it make sense. Do you think it would be possible obtaining the same results that comes from setting the parameters in Ansys Maxwell, simply evaluating the torque has the the cross product between the total force and the distance from that axis?
April 13, 2020 at 3:27 pmPaul LarsenAnsys Employee
Not in all cases. That was more of a "thought example", for example for a case with net force (like a magnet next to a steel plate). However, many cases have zero net force, but a non-zero torque (like a balanced electric motor). So, many conditions can affect the difference between evaluated torque and the cross-product of total force crossed with the lever-arm. These are all consequences of a distributed force density and whether the position w.r.t. the rotational axis is included within the integral or assumed constant to move outside the integral of force density.
April 14, 2020 at 8:15 amAliosha86Subscriber
Thank you Pblarsen,
I appreciate a lot your answer. Now I have a better understanding.
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Signing up as ANSYS Support Coordinator
- simulation completed with execution error on server
- How to export Ansys Maxwell simulation results for post-processing in matlab or in .csv file
- Maxwell, HFSS or Q3D?
- Running ANSYS HFSS on the HPC (it runs on Linux only)
- Number of parallel paths in Ansys Maxwell
- Illegal External Terminal – assigning current to a coil
- Domain Decomposition in HFSS
- Unable to assign correctly the excitations in a coil
© 2022 Copyright ANSYS, Inc. All rights reserved.