Ansys Mechanical – Help with static structural setup error

ramintk · November 5, 2023, 06:34

Hello everyone,

I am trying to perform a finite element method (FEM) simulation of von Mises stress for a rotor of a permanent magnet synchronous motor (PMSM) in Ansys Mechanical. I have completed the static structural setup, but I am encountering the following error:

"Not enough constraints appear to be applied to prevent rigid body motion. This may lead to solution warnings or errors. Check results carefully." I also deleted the automatic connection, inserted the connection group as a joint, and then created a new automatic connection. However, the error did not go away.

I have attached some pictures of my setup details for your reference. Any help would be greatly appreciated. https://drive.google.com/drive/folde...do0OqyEBa-KaLx

Untitled.jpg

evcelica · May 14, 2024, 10:34

You did not constrain or define all 6 Degrees of freedom. Looks like your model is not constrained in the Z (axial) direction, which would allow to rigid body motion.

NickS · May 23, 2024, 01:41

Hello,

One thing I've discovered while struggling with Ansys: sometimes, a little detail like a misapplied constraint can screw things up. Pro tip: send an email to Ansys technical support with a detailed description of your problem. They're super responsive and can often spot what's going wrong.

Martin_Sz · June 14, 2024, 05:27

try to glue most parts where are bonded connections and review Ur BC's . Your rotor want to fly to the cosmic ethernal

You have not enough suppoorts on Ur model

Martin_Sz · June 22, 2024, 16:00

Try to pass these tips in the link below
https://howtooansys.blogspot.com/202...ot-enough.html

dhein · August 6, 2024, 10:32

Are all bodies bonded via contact or shared topology?

Is it right, that only the shaft is supported frictionless? Are here also the end faces supported?

November 5, 2023, 06:34	Ansys Mechanical – Help with static structural setup error	#1
ramintk New Member ramin Join Date: Nov 2023 Posts: 1 Rep Power: 0	Hello everyone, I am trying to perform a finite element method (FEM) simulation of von Mises stress for a rotor of a permanent magnet synchronous motor (PMSM) in Ansys Mechanical. I have completed the static structural setup, but I am encountering the following error: "Not enough constraints appear to be applied to prevent rigid body motion. This may lead to solution warnings or errors. Check results carefully." I also deleted the automatic connection, inserted the connection group as a joint, and then created a new automatic connection. However, the error did not go away. I have attached some pictures of my setup details for your reference. Any help would be greatly appreciated. https://drive.google.com/drive/folde...do0OqyEBa-KaLx Untitled.jpg

May 23, 2024, 01:41		#3
NickS New Member Nick Join Date: May 2024 Posts: 1 Rep Power: 0	Hello, One thing I've discovered while struggling with Ansys: sometimes, a little detail like a misapplied constraint can screw things up. Pro tip: send an email to Ansys technical support with a detailed description of your problem. They're super responsive and can often spot what's going wrong. Last edited by NickS; June 7, 2024 at 05:13.

June 14, 2024, 05:27		#4
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 313 Rep Power: 13	try to glue most parts where are bonded connections and review Ur BC's . Your rotor want to fly to the cosmic ethernal You have not enough suppoorts on Ur model __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

June 22, 2024, 16:00		#5
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 313 Rep Power: 13	Try to pass these tips in the link below https://howtooansys.blogspot.com/202...ot-enough.html __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[OpenFOAM] ParaView command in Foam-extend-4.1	mitu_94	ParaView	0	March 4, 2021 14:46
DPM udf error	haghshenasfard	FLUENT	0	April 13, 2016 07:35
How to install CGNS under windows xp?	lzgwhy	Main CFD Forum	1	January 11, 2011 19:44
CGNS lib and Fortran compiler	manaliac	Main CFD Forum	2	November 29, 2010 07:25
Problem with compile the setParabolicInlet	ivanyao	OpenFOAM Running, Solving & CFD	6	September 5, 2008 21:50

May 14, 2024, 10:34		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,186 Rep Power: 23	You did not constrain or define all 6 Degrees of freedom. Looks like your model is not constrained in the Z (axial) direction, which would allow to rigid body motion.

August 6, 2024, 10:32		#6
dhein New Member Join Date: Apr 2021 Location: Ulm, Germany Posts: 10 Rep Power: 5	Are all bodies bonded via contact or shared topology? Is it right, that only the shaft is supported frictionless? Are here also the end faces supported?