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RE: Magnet Motion Simulation

Posted 1 lug 2016, 03:29 GMT-4 Low-Frequency Electromagnetics, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization Version 5.0 6 Replies

Akhil Sathuluri
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Hello,
I'm trying to simulate the motion of a permanent neodymium magnet under the influence of another magnet kept right above it and moving along some fixed axis. The material between the magnets is a plastic sheet and extends infinitely long. The magnets are on either side of the sheet (rigid sheet) on top of each other. Ive modeled the magnets correctly but couldn't simulate the motion. I tried parametric where i only see the effect of one magnet moving, but the other magnet is assumed to be fixed, but i want to simulate the effect where both of them move under motion of either of the magnets in the respective plane parallel to the plastic sheet. How do i set up physics for this? Should i involve anything other than just magnets? Im presently working on AC/DC Module, No currents.
Thanks in advance
6 Replies Last Post 6 lug 2016, 13:52 GMT-4
Nirmal Paudel COMSOL Employee

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Posted: 8 years ago 2 lug 2016, 18:28 GMT-4
Hi,

We do recommend to follow the approach used in this example.
www.comsol.com/model/voltage-induced-in-a-coil-by-a-moving-magnet-14163

In addition, the following blog posts might be useful to model the moving magnet.
www.comsol.com/blogs/part-1-how-to-model-a-linear-electromagnetic-plunger/

www.comsol.com/blogs/deformed-mesh-interfaces-rotations-and-linear-translations/
www.comsol.com/blogs/model-translational-motion-with-the-deformed-mesh-interfaces/

Best Regards,
Nirmal Paudel

Hi, We do recommend to follow the approach used in this example. https://www.comsol.com/model/voltage-induced-in-a-coil-by-a-moving-magnet-14163 In addition, the following blog posts might be useful to model the moving magnet. https://www.comsol.com/blogs/part-1-how-to-model-a-linear-electromagnetic-plunger/ https://www.comsol.com/blogs/deformed-mesh-interfaces-rotations-and-linear-translations/ https://www.comsol.com/blogs/model-translational-motion-with-the-deformed-mesh-interfaces/ Best Regards, Nirmal Paudel
Akhil Sathuluri
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Posted: 8 years ago 5 lug 2016, 09:30 GMT-4
I'm trying to simulate movement of a single magnet in an air domain by using deformable mesh. But the magnet's mesh is not being translated linearly. It returns a warning, saying "Inverted Mesh element" or sometimes returns error, "Relative error greater than tolerance". I defined the mesh displacements similar to the ones given in the moving magnet example. Here I attach the image of the result after magnet being translated. The magnet is not being maintained as a single rectangle its sides are warping.
I'm trying to simulate movement of a single magnet in an air domain by using deformable mesh. But the magnet's mesh is not being translated linearly. It returns a warning, saying "Inverted Mesh element" or sometimes returns error, "Relative error greater than tolerance". I defined the mesh displacements similar to the ones given in the moving magnet example. Here I attach the image of the result after magnet being translated. The magnet is not being maintained as a single rectangle its sides are warping.

Attachments:

Yves Stocker
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Posted: 8 years ago 5 lug 2016, 10:21 GMT-4
Simply increase the fineness of the mesh. If you put a chamfer or a rounded 0.5 mm for example, and your mesh is 1mm, then you have an error message.
Simply increase the fineness of the mesh. If you put a chamfer or a rounded 0.5 mm for example, and your mesh is 1mm, then you have an error message.
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 5 lug 2016, 10:43 GMT-4
Hello Akhil,
This blog explains how to set up a moving mesh interface to permit large translations:
www.comsol.com/blogs/deformed-mesh-interfaces-rotations-and-linear-translations/
Best regards,
Jeff
Hello Akhil, This blog explains how to set up a moving mesh interface to permit large translations: https://www.comsol.com/blogs/deformed-mesh-interfaces-rotations-and-linear-translations/ Best regards, Jeff
Akhil Sathuluri
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Posted: 8 years ago 6 lug 2016, 09:14 GMT-4
Thank you for the post. But I'm still facing the same problem, can you please elaborate on the meshing method. I tried meshing as said by using form assembly and identity pairs, also tried a very fine mesh. I am trying to simulate a square magnets motion in a rectangular air domain. The edges of the mesh outside the magnet seem not to move. But the ones attached to the magnet are pulled with it, making it deform very much and is causing an inverted mesh error.
Thank you for the post. But I'm still facing the same problem, can you please elaborate on the meshing method. I tried meshing as said by using form assembly and identity pairs, also tried a very fine mesh. I am trying to simulate a square magnets motion in a rectangular air domain. The edges of the mesh outside the magnet seem not to move. But the ones attached to the magnet are pulled with it, making it deform very much and is causing an inverted mesh error.
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 6 lug 2016, 13:52 GMT-4
I would recommend you contact COMSOL's support team: www.comsol.com/support/ .
Best regards,
Jeff
I would recommend you contact COMSOL's support team: www.comsol.com/support/ . Best regards, Jeff

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