COMSOL simulation of a 3D Ferrite Bar Numerical Model For Magnetic Flux

Click For Summary

Discussion Overview

The discussion revolves around simulating a 3D ferrite bar transmitter and receiver using COMSOL Multiphysics, focusing on the coupling coefficient and magnetic flux density through finite element methods. Participants explore the application of the Magnetic Fields module and the necessary parameters for modeling self-inductance and mutual inductance in the context of electric vehicle (EV) chargers.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant outlines the equations and parameters necessary for simulating magnetic field distribution, including the coupling coefficient k and magnetic flux density Bt.
  • Another participant questions the practical application of the unusual geometry of the ferrite bars, asking if it is part of a real device or merely a practice model.
  • A participant mentions that the geometry is practical and used in EV chargers, expressing a need for guidance on mandatory simulation steps in COMSOL.
  • There is a request for clarification on the intended use of the geometry, including whether it is for non-contact recharging and the typical separation distance between coils.
  • One participant expresses frustration that their original question may not have been understood, indicating a desire for responses from those with simulation expertise.
  • A later post references an updated thread that has provided answers to some questions about coil geometry.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and familiarity with the simulation process, and there is no consensus on the specific application or effectiveness of the geometry discussed. The discussion remains unresolved regarding the practical implications of the geometry and the simulation steps required.

Contextual Notes

Participants mention various materials available in COMSOL and online, but there is uncertainty regarding the completeness of the simulation setup and the specific requirements for modeling the coils.

Hasan2022
Messages
6
Reaction score
0
Hi,

I am willing to simulate a 3D ferrite bar transmitter and reciever where coupling coefficient k and Bt magnetic flux density on the each side uses the finite element method for solving partial differential equations.

The Magnetic Fields module has equation (jωσ − ω2ε0εr)A + ∇ × H = Je,

which enables calculation of magnetic field distribution B = ∇ × A, where ω is the angular frequency, σ is the electrical conductivity, ε0 is the permittivity of vacuum, εr is the relative permittivity, A is the magnetic vector potential, H is the magnetic field intensity, B is the magnetic flux density, and Je is the external current density.

In my research AC/DC Module, Magnetic Fields need to used for simulation of magnetic flux density and the coupling coefficient in 3D numerical models. Coil Current Calculation, and Frequency Domain for each of the transmitter and receiver coil need to use for studies of a problem in Comsol Multiphysics.Two parameters, the coupling coefficient k and magnetic flux density on transmitter side Bt for stray magnetic fields were used in measurements. The first parameter k was used to analyze the different ferrite core geometries. The second parameter Bt was used to analyze the optimal geometries of ferrite bars in terms of magnetic shield.Two models are required in Comsol Multiphysics, where in the first model simulated self-inductance of the transmitter coil L1, mutual inductance M, and magnetic flux density Bt. With the second model it should simulated self-inductance of the receiver coil L2.Kindly see the geometry made of n = 9 ferrite bars on the transmitter side and ferrite plate on the receiver side.
geometry_3D.PNG
 
Engineering news on Phys.org
Welcome to PF. :smile:

Hasan2022 said:
Kindly see the geometry made of n = 9 ferrite bars on the transmitter side and ferrite plate on the receiver side.

Wow, that's an unusual geometry! Is it part of a real device, or is it just a way to practice complicated geometries in COMSOL?
 
berkeman said:
Welcome to PF. :smile:
Wow, that's an unusual geometry! Is it part of a real device, or is it just a way to practice complicated geometries in COMSOL?
It is very parctical and people using in EV chargers.
I already started to simulate in comsol, need some sequences to perform.

There are many marerials in comsol and online.
I need to kind of simulation for self inductance for both receiver and transmitter coil.

Looking at the simulation for coils, I am in little bit of confusion.
1. In Global> parameter> I included the data for calculating mutual inductacnce, turns of coils, currents, coupling coefficients, magnetic fields and so on...

2. For the geometry, I have multiple task, a reference frame should be generate like a work plane. Using solid I managed to draw spiral coils, transmitters and recievers as I posted the image.I will be happy if you can tell me which things are mandatory in this simulation, take a look very close related instructions file here.
 

Attachments

Last edited:
Hasan2022 said:
It is very parctical and people using in EV chargers.
Interesting. I'm still not seeing the reasons for that particular geometry -- can you post some links to the typical chargers that you are referring to? And is it meant to be a non-contact recharge of the EV with the bottom coil and ferrites below the car and the upper coil and plate inside the car? What is the typical separation distance between the coils?
 
I think your response wrongly directed what I intended to ask. May be I asked something to whom who already has this simulation knowledge.
berkeman said:
Interesting. I'm still not seeing the reasons for that particular geometry -- can you post some links to the typical chargers that you are referring to? And is it meant to be a non-contact recharge of the EV with the bottom coil and ferrites below the car and the upper coil and plate inside the car? What is the typical separation distance between the coils?
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
Replies
1
Views
3K
  • · Replies 47 ·
2
Replies
47
Views
8K
Replies
1
Views
2K
Replies
1
Views
8K
  • · Replies 8 ·
Replies
8
Views
10K
  • · Replies 4 ·
Replies
4
Views
3K
Replies
6
Views
13K
  • · Replies 3 ·
Replies
3
Views
9K
  • · Replies 12 ·
Replies
12
Views
11K