Hello, and thank you for posting this helpful video. I have one point of cunfusion: The right hand side is labeled "South" indicating that the flux arrows should be going into the magnet. yet at 8:31 they are coming out of the magnet which is what I would expect for the north side. The remanent flux direction is Z=-1, which is consistent with the flux arrows pointing down. I appreciate any clarification on why the right is not the north side.
Thanks for the tutorial. One question if you can help: @4:30 You define the magnetization of the North and South poles by typing in a remanent flux density of 1T along the z-direction (0,0,1). However, I want to model the magnet at some angle, so its magnetization should not be along the global z-axis. Then it wouldn't work? Can you recommend a different way in that case?
Do you wan the magnet itself to be tilted or the magnetization inside the magnet is at an angle? If the latter is what you want then you can find the flux component along each axis and enter them. It should work.
@JafScience thanks for the reply. It is the first option. I want to take the magnet (which has its magnetization fixed along one of it's own axes), and then rotate the entire magnet.
@@ppxtb To rotate the magnet itself, go to 'transformations' under Geometry and select 'Rotate'. Then right click on Definitions, go to Coordinate Systems, and insert Base Vector System. This will allow you to define a new cartesian coordinate system that is oriented with the magnet. When specifying magnetic flux in the physics, choose the new coordinate system and let the magnetic flux direction be along the axis of the magnet.
What is or what does the "magnetic flux conservation" option specifically do and why are north and south drawn in the final figure if they are "air"? good video
Magnetic flux conservation solves for the magnetic field and imposes the condition that all field lines must be contained within the geometry (divergence=0).
Yes, you could either specify the magnetization direction by entering unit vectors in polar coordinates, or you could insert a cylindrical coordinate system under 'definitions'. Use this coordinate system in the physics and specify the magnetization direction to be along the 'r' coordinate. The 2nd method is easier.
It is not important which material is assigned to the legs because the magnetization model for the legs is defined in the physics. The C section iron does not produce its own magnetic field so it is important to define it as iron. The legs produce their own field.
You can create a closed wire loop that carries DC current (use coil feature or edge current). If the wire loop is infinitesimally small then it will represent a magnetic dipole. This is not possible numerically but if you make it sufficiently small with respect to any other neighbouring object then you will get a good approximation.
can you do modeling strain of magnetostrictive material (replaced the cylindrical metal) vs Ghz frequency of alternating magnetic field (alternating current in a coil)?
I currently don't have access to Comsol. If you only want to replace the material with a magnetostrictive one you can use the magnetostriction coupling and assign it to the geometrical part of interest.
To get a hysteresis loop the magnetic field in the object needs to vary. This should be done in a time-dependent study in which either the magnet moves or you should simulate an AC electromagnet next to the object. In both cases you should select hysteresis Jiles-Atherton model under Ampere's law for the object.
There isn't a fixed price. Comsol will give a quote when you contact them. Academic institutions, companies, and private individuals all get different price tags.
this video really helped me a lot
Hello, and thank you for posting this helpful video. I have one point of cunfusion: The right hand side is labeled "South" indicating that the flux arrows should be going into the magnet. yet at 8:31 they are coming out of the magnet which is what I would expect for the north side. The remanent flux direction is Z=-1, which is consistent with the flux arrows pointing down. I appreciate any clarification on why the right is not the north side.
Good catch! I just reviewed it and it seems that north and south labelling have been reversed. Thank you for pointing this out!
@@JafScience Thank YOU!
nice work. pls keep on giving more examples about magnets, ferrite cores, coils etc.
Check out the new video on Helmhotz coil!
@@JafScience thank you, your simulations are very informative and i learnt too much. looking forward for the new ones.
Glad to hear that!
Thanks for the tutorial. One question if you can help: @4:30 You define the magnetization of the North and South poles by typing in a remanent flux density of 1T along the z-direction (0,0,1). However, I want to model the magnet at some angle, so its magnetization should not be along the global z-axis. Then it wouldn't work? Can you recommend a different way in that case?
Do you wan the magnet itself to be tilted or the magnetization inside the magnet is at an angle? If the latter is what you want then you can find the flux component along each axis and enter them. It should work.
@JafScience thanks for the reply. It is the first option. I want to take the magnet (which has its magnetization fixed along one of it's own axes), and then rotate the entire magnet.
@@ppxtb To rotate the magnet itself, go to 'transformations' under Geometry and select 'Rotate'. Then right click on Definitions, go to Coordinate Systems, and insert Base Vector System. This will allow you to define a new cartesian coordinate system that is oriented with the magnet. When specifying magnetic flux in the physics, choose the new coordinate system and let the magnetic flux direction be along the axis of the magnet.
What is or what does the "magnetic flux conservation" option specifically do and why are north and south drawn in the final figure if they are "air"? good video
Magnetic flux conservation solves for the magnetic field and imposes the condition that all field lines must be contained within the geometry (divergence=0).
Awesome tut. Is it possible to radially magnetize a part?
Yes, you could either specify the magnetization direction by entering unit vectors in polar coordinates, or you could insert a cylindrical coordinate system under 'definitions'. Use this coordinate system in the physics and specify the magnetization direction to be along the 'r' coordinate. The 2nd method is easier.
This video was very helpful. Thanks a lot. I just wanted to know why the two legs of the magnet are given Air as material? Why not iron?
It is not important which material is assigned to the legs because the magnetization model for the legs is defined in the physics. The C section iron does not produce its own magnetic field so it is important to define it as iron. The legs produce their own field.
@@JafScience Okay thank you so much
If possible please share some idea how I can model a magnetic dipole in comsol.
You can create a closed wire loop that carries DC current (use coil feature or edge current). If the wire loop is infinitesimally small then it will represent a magnetic dipole. This is not possible numerically but if you make it sufficiently small with respect to any other neighbouring object then you will get a good approximation.
can you do modeling strain of magnetostrictive material (replaced the cylindrical metal) vs Ghz frequency of alternating magnetic field (alternating current in a coil)?
I currently don't have access to Comsol. If you only want to replace the material with a magnetostrictive one you can use the magnetostriction coupling and assign it to the geometrical part of interest.
Thanks a lot! 👌🏾👌🏾
How can I do to simulate the interaction between magnet and ferromagnetic object ?
I’m struggling about that
Thanks!
Are you trying to simulate the magnetic response of a ferromagnet near a magnet or you want to compute the forces due to the interaction?
@@JafScience the magnetic response and plot the hysteresis loop
To get a hysteresis loop the magnetic field in the object needs to vary. This should be done in a time-dependent study in which either the magnet moves or you should simulate an AC electromagnet next to the object. In both cases you should select hysteresis Jiles-Atherton model under Ampere's law for the object.
@@JafScience i got it.
imma try it. thank you so much!
I hope it works!
I also plan to make a tutorial for hysteresis in the coming weeks.
calming music ..
how much does the license of this "wonderful" piece of software cost?
There isn't a fixed price. Comsol will give a quote when you contact them. Academic institutions, companies, and private individuals all get different price tags.