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3D Model of "Voltage Induced in a Coil by a Moving Magnet"

Posted 16.05.2013, 15:39 GMT-4 Low-Frequency Electromagnetics, Studies & Solvers Version 4.3a, Version 4.3b 1 Reply

Mario Andres Kovacs
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Hi

I wanted to do the 3D version of the Model "Voltage Induced in a Coil by a Moving Magnet" which is in the Comsol Library.

I used the same physics, materials and boundary conditions, but unfortunately the 3D Model does not converge.

Do I have to adapt something in order to make the 3D model work??

I would be really glad if you can help me out!!!

Thanks
1 Reply Last Post 01.08.2013, 06:30 GMT-4
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Hello Mario Andres Kovacs

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Miguel J. Aranda
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Posted: 1 decade ago 01.08.2013, 06:30 GMT-4
Hi, Mario.

Did you have any luck solving this?

I have also tried to implement the "Voltage Induced in a Coil by a Moving Magnet" in 3D (as a previous step toward a real 3D model ─i.e., without axial symmetry─) and I algo got convergence problems.

In order to know which part of the model was failing, I systematically reduced the complexity of the model. I removed the coil (that is, having then just a moving magnet) and still arised convergence problems. Then, I removed the moving mesh (but still tried to solve the stationary and time dependent problem, but the magnet is not moving anymore) and... convergence problems arised. Removing the time dependent step (that is, solving just the stationary problem, getting the magnetic flux density, B, in space) everything is ok.

So I don't know why, but the system is unable to converge even if you just have a magnet pinned in space and tries to get the magnetic flux density in time (which is, of course, the same solution than the stationary).

On the other hand, removing just the coil AND using "magnetic fields, no currents (mfnc)" instead of "magnetic fields (mf)" the system converges and you get the magnetic flux density of a moving magnet in time. But, obviously, you cannot add the coil and get to know the voltage induced in it.

I don't know what else to try. Any suggestion will be welcome.

Thanks in advance.
Hi, Mario. Did you have any luck solving this? I have also tried to implement the "Voltage Induced in a Coil by a Moving Magnet" in 3D (as a previous step toward a real 3D model ─i.e., without axial symmetry─) and I algo got convergence problems. In order to know which part of the model was failing, I systematically reduced the complexity of the model. I removed the coil (that is, having then just a moving magnet) and still arised convergence problems. Then, I removed the moving mesh (but still tried to solve the stationary and time dependent problem, but the magnet is not moving anymore) and... convergence problems arised. Removing the time dependent step (that is, solving just the stationary problem, getting the magnetic flux density, B, in space) everything is ok. So I don't know why, but the system is unable to converge even if you just have a magnet pinned in space and tries to get the magnetic flux density in time (which is, of course, the same solution than the stationary). On the other hand, removing just the coil AND using "magnetic fields, no currents (mfnc)" instead of "magnetic fields (mf)" the system converges and you get the magnetic flux density of a moving magnet in time. But, obviously, you cannot add the coil and get to know the voltage induced in it. I don't know what else to try. Any suggestion will be welcome. Thanks in advance.

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