Magnetostatics Puns

Hi all!

I'm trying to model an air gap in a transformer core using Ansys Academic 2021 R1 using the magneto static analysis method. Every time I run the solver, Ansys returns an error stating:

"The option of ALPX on the MP command is either not available for this

version of ANSYS or the appropriate product was not selected for this

session."

In order to narrow down the problem I have basically reproduced the transformer core step for step, as shown in this video (this is an aside issue, but I was unable to achieve the correct orientation of the current source even after defining new coordinate systems for each section of coil - each of my 4 current vectors point in the same direction wrt the global axis, i.e. they don't form a loop - see 1st attached image).

From what I can see here ALPX is some thermal expansion coefficient (I have little/no interest for thermal effects in my simulation) for material properties. At the bottom of the page of the previous link, there is a table which lists products that the MP command usable in - the academic version not being one :(. Is there a way of just disabling this thermal property, or will I just run into more academic based limitations?

Any help with this matter is most appreciated!

Alex

Incorrect direction of current vectors in coil - should all be in a continuous circulating loop formation.

Coordinate systems of each coil section. Principal axis vectors do point in the desired loop formation.

We want to simulate a linear induction motor using Maxwell 2D but we aren't to set up a relative motion between the rotor and the stator. However, we know that this is possible in COMSOL.

We would love any feedback.

Thanks!

Has anyone ever heard of or seen magnetostatic headphones? Someone told me they are the same as planar magnetic headphones but I couldn't find anything to support his claim.

I am trying to relearn my E&M before graduate school and this is frustratingly the hardest part of diving back into physics. How do I get better at setting up my E&M problems? Specifically at identifying what the correct separation vector to use is?

https://www.indiegogo.com/projects/hpsd-e70-the-world-s-first-magnetostatic-earphones-iphone-design#/

Despite looking a long time, i'm not even sure how the technology they are claiming to use works. But hey, you are paying $125 for wired earphones, so they must be "audiophool" quality, right?

And, oh yes, true to indiegogo form, the official campaign video is in the form of a fake product review:

https://www.youtube.com/watch?v=AxylX0pbfMc

https://i.imgur.com/yvE62g4.jpg

I know this is some kind of derivation of Ampere’s Law, I just can’t figure out what case it’s in or in particular what the z-variable is. Can someone enlighten me? Thanks!

1. I started solving the question with curl of H equal to free current density.As I proceeded, I needed to find out divergence of M(magnetization vector). If it came out to be zero then I could get the Laplace's equation. However I don't know how to show divergence of M to be zero.
2. If I have went down the wrong track or begun the wrong way with this problem then also please specify.

Edit: Wrote div of H equal to free current density where the correct one is curl of H. Corrected.

i'm student who major in mechanical engineering. i have a question about magnetostatic simulation in ansys. i modeled permanent magnet and simulated. then the result of magnetic field is generated and i can see that through magnetic field intensity. but i am wondering how can i visualize electric field based on magnetic field in magnetostatic simulation. i did not set the coil and i just modeled permanent magnet with coercive force and residual induction. please give me a answer

Looking to do force analysis of a solenoid in 3D. Supposedly Calculix and Code_aster can do it, but I haven't found any examples.

So...

I'm An engineer student and i'm suppose to study the anomaly in the earth's magnetic field due to a ferromagnetic object buried underground like an UXO for example.. i have the primary geometry which is a spheroid with a high magnetic permeability in a square of homogeneous ground.

my study is in 2D

so now the question :

• How i'm going to impose the physical parameter of the ground and the sphere in Matlab ?

• How i'm going to impose the Dirichlet condition in the boundary as the earth's magnetic field ?

• finally how to visualize the magnetic line deformation

thank you

My Matlab script until now :

                %1er essai du programation de la detection par Magnetometrie %%

clear all

clc

                    %Introduction des constantes et grandeurs géometriques %%%%

mm=1e-3;

nx=20;

ny=20;

h=1.e-3;

A=zeros(nx,ny);

E=zeros(nx,ny);

A2=A;

E0=20;

% L'Objet Enfoui %

miu=[100];

sigma=[58e6];

% Le Sol %

miu_sol=[1];

sigma_sol=[4e6];

%

g=[];

% Le Sol %

x1=0;y1=0;x2=nx;y2=ny;

g0=[2 x1 x2 y1 y1 1 0 0 0 0 0 0]';g=[g g0];

g0=[2 x2 x2 y1 y2 1 0 0 0 0 0 0]';g=[g g0];

g0=[2 x2 x1 y2 y2 1 0 0 0 0 0 0]';g=[g g0];

g0=[2 x1 x1 y2 y1 1 0 0 0 0 0 0]';g=[g g0];

% L'objet Enfoui %

x1=12;y1=10;x2=8;y2=10;x0=10;y0=10;Rx=2;Ry=2;

g0=[4 x1 x2 y1 y1 2 1 x0 y0 Rx Ry 0]';g=[g g0];

x1=8;y1=10;x2=12;y2=10;x0=10;y0=10;Rx=2;Ry=2;

g0=[4 x1 x2 y1 y1 2 1 x0 y0 Rx Ry 0]';g=[g g0];

%

figure(1)

pdegplot(g);axis equal;

% Le Maillage %

[p,e,t]=initmesh(g);

[p,e,t]=refinemesh(g,p,e,t);

[p,e,t]=refinemesh(g,p,e,t,1);

[p,e,t]=refinemesh(g,p,e,t,2);[p,e,t]=refinemesh(g,p,e,t,2);

figure(2)

pdemesh(p,e,t);axis equal;

I've recently started RoC, and I've run into a problem with upgrading my Magnetostatic Engine to level 2. It needs to be charged with 720 microTeslas to work, and for the life of me I cannot find out how to charge it.

Any ideas?