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3d mangnetic field due to heat propogation

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How do i create a 3d mangnetic field of a magnet and see how the field changes as it heats up.

Also, is there a way to show how much of the magnetic flux is cutting a coil of wire around it??

9 Replies Last Post 8 mai 2011, 12:09 UTC−4

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Posted: 1 decade ago 1 mai 2011, 06:38 UTC−4
its important..anyone? i need help
its important..anyone? i need help

Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 2 mai 2011, 01:30 UTC−4
Hi

well chose MF, stationary , draw your magnet (centred at 0,0,0), surround it by a sphere of radius >3-4 times your magnet, add a 1/10 radius shell on your sphere (in v4 you have the layer) call it a Infinite Element layer, add a "Ampers's Law 2" and select the magnet. Set the Magnetic field tab to Magnetisation and type M =1E6[A/m] (or whatever you need) for one direction. Do not forget to add the material air: sigma = 1, epsilon_r=1, mu_r=1 and the magnet sigma =1, epsilon_r =1, mu_r =1.1 (or whatever material properties that fit)

Then solve, you may test with or without a Inf Elements. To integrate the flux you might either Data set cut surface and integrate over it, or you add a dummy body(ies) of "air to define your relevant surfaces, and then you might pick the boundaries and integrate over them. By the way use spherical Infinite elements! this with a sphere is not the default

But this yo should have managed by your own if you had done some of the simple examples in the Model library, no ?

--
Good luck
Ivar
Hi well chose MF, stationary , draw your magnet (centred at 0,0,0), surround it by a sphere of radius >3-4 times your magnet, add a 1/10 radius shell on your sphere (in v4 you have the layer) call it a Infinite Element layer, add a "Ampers's Law 2" and select the magnet. Set the Magnetic field tab to Magnetisation and type M =1E6[A/m] (or whatever you need) for one direction. Do not forget to add the material air: sigma = 1, epsilon_r=1, mu_r=1 and the magnet sigma =1, epsilon_r =1, mu_r =1.1 (or whatever material properties that fit) Then solve, you may test with or without a Inf Elements. To integrate the flux you might either Data set cut surface and integrate over it, or you add a dummy body(ies) of "air to define your relevant surfaces, and then you might pick the boundaries and integrate over them. By the way use spherical Infinite elements! this with a sphere is not the default But this yo should have managed by your own if you had done some of the simple examples in the Model library, no ? -- Good luck Ivar

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Posted: 1 decade ago 7 mai 2011, 11:56 UTC−4
Thanks, I was trying really hard to understand what you wrote but I can't get it workign my model. I didn't even understand what you wrote, sorry.

But I have model made in inventor on which i want to carry out the simulation on.

The CAD model is attach. Can you please help me step by step how to perform the test?

What I want to do is simple, 400 degree celicus to be on top of the piston head. The bars sticking out in the bottom of piston are the magnets. I want to see the the change in magnetic field, flux density and strength of magnetic field about 10 centimeter away from the central axis of the pistion. I have to calculate induced voltage.

I need to test the simulation with different permanent magnets.
Thanks, I was trying really hard to understand what you wrote but I can't get it workign my model. I didn't even understand what you wrote, sorry. But I have model made in inventor on which i want to carry out the simulation on. The CAD model is attach. Can you please help me step by step how to perform the test? What I want to do is simple, 400 degree celicus to be on top of the piston head. The bars sticking out in the bottom of piston are the magnets. I want to see the the change in magnetic field, flux density and strength of magnetic field about 10 centimeter away from the central axis of the pistion. I have to calculate induced voltage. I need to test the simulation with different permanent magnets.


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Posted: 1 decade ago 8 mai 2011, 02:59 UTC−4
Can someone please help me
Can someone please help me

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Posted: 1 decade ago 8 mai 2011, 04:00 UTC−4
see the pic for exactly what i'm trying to do... please help me on it.
see the pic for exactly what i'm trying to do... please help me on it.


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Posted: 1 decade ago 8 mai 2011, 08:58 UTC−4
I want to integrate the flux over the circular solid around the piston

You can see the save files below [attachment]
I want to integrate the flux over the circular solid around the piston You can see the save files below [attachment]


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Posted: 1 decade ago 8 mai 2011, 11:09 UTC−4
I'm doing the tutorials. Ill come back if I have any problem so don't bother replyign just yet
I'm doing the tutorials. Ill come back if I have any problem so don't bother replyign just yet

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Posted: 1 decade ago 8 mai 2011, 11:26 UTC−4
Okay,, I just to find out can I calculate the current through induction by telling comsol that the permanent magnetic is moving up and down vertical motion at lets say 20 times in a second and traveling total distance of lets say X meters in one vertical movement. So it basically travels 2 times X to complte one cycle.
Okay,, I just to find out can I calculate the current through induction by telling comsol that the permanent magnetic is moving up and down vertical motion at lets say 20 times in a second and traveling total distance of lets say X meters in one vertical movement. So it basically travels 2 times X to complte one cycle.

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Posted: 1 decade ago 8 mai 2011, 12:09 UTC−4
actually i need help making it.. please help me
actually i need help making it.. please help me

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