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Body fixed coordinate system

Posted 2 oct. 2017, 04:47 UTC−4 Low-Frequency Electromagnetics, Structural & Acoustics Version 5.3 2 Replies

Michael Mattmann
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Hi

I have a question on how to create a body fixed coordinate system. I am performing a simulation with a rotating magnet. At this point a implemented the magnets magnetisation using the global coordinate system... But I need an axial magnetisation, therefore the magnetisation axis should rotate according to the magnet rotation.

Thank you in advance Michael

2 Replies Last Post 2 oct. 2017, 10:01 UTC−4
Nirmal Paudel Tribhuvan University/Electrical Engineering
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Posted: 7 years ago 2 oct. 2017, 09:32 UTC−4

Hi Michael,

If you use the "Rotating Machinery, Magnetic (rmm)" physics interface in AC/DC Module, it will be very easy and automatic to apply the radial or axial magnetization as done in the following examples. I would suggest you to take a look and apply the same method in your modeling needs. 1. https://www.comsol.com/model/generator-in-2d-2122 2. https://www.comsol.com/model/electrodynamic-wheel-magnetic-levitation-in-2d-44871

Best Regards, Nirmal Paudel

Hi Michael, If you use the "Rotating Machinery, Magnetic (rmm)" physics interface in AC/DC Module, it will be very easy and automatic to apply the radial or axial magnetization as done in the following examples. I would suggest you to take a look and apply the same method in your modeling needs. 1. https://www.comsol.com/model/generator-in-2d-2122 2. https://www.comsol.com/model/electrodynamic-wheel-magnetic-levitation-in-2d-44871 Best Regards, Nirmal Paudel
Michael Mattmann
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Posted: 7 years ago 2 oct. 2017, 10:01 UTC−4

Hi Nirmal

Thanks for your fast response. Sorry, I may have explained my situation a little bit too simplified... I have a flexible catheter with a magnet on it's tip. I'm trying to simulate the behaviour/deformations of this catheter when a magnetic field is applyed. Based on my knowlege the tip of the catheter should be displaced and rotated in order to align with the magnetic field... So far I used a combination on magnetic fields, no currents and solid mechanics... But, as said, i'm not able to model an axial magnetisation. As it is not a simple ratation I can't use a cylindrical coordinate system with fixed origin. I was not able to find how to fix a coordinate axis to a body axis.

Best Michael

Hi Nirmal Thanks for your fast response. Sorry, I may have explained my situation a little bit too simplified... I have a flexible catheter with a magnet on it's tip. I'm trying to simulate the behaviour/deformations of this catheter when a magnetic field is applyed. Based on my knowlege the tip of the catheter should be displaced and rotated in order to align with the magnetic field... So far I used a combination on magnetic fields, no currents and solid mechanics... But, as said, i'm not able to model an axial magnetisation. As it is not a simple ratation I can't use a cylindrical coordinate system with fixed origin. I was not able to find how to fix a coordinate axis to a body axis. Best Michael

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