Finding Mutual induction between coil and metal plate

[Waqas_azeb]

Hi Members,

I am trying to calculate the mutual inductance between the metal plate sandwiched between two copper coils. I can find the mutual inductance between the two coils but I want to calculate the mutual inductance between the the each coil with the metal plate.

Can anyone please help me with that, I have attached the ANSYS Maxwell file.

Thanks!

 

[FvM]

No files attached, but what is inductance of metal plate? An inductor needs two terminals, isn't it? Please show a sketch of the setup.

Are you referring to inductance reduction caused by metal plate?

 

[Waqas_azeb]

Please see the files here. The metal plate I used is Aluminum, with a thieckness of 0.5mm. The length and breadth are 100mm * 100mm.

 

[Waqas_azeb]

This is the sketch from ANSYS. I have used ferrite on top and at the bottom of the coils.

 

[FvM]

I don't see how you can assign an inductance to the metal plate. You can model its effect either as a modification of L1 and L2 (reduced inductance, increased loss factor) or by a parallel connected lossy inductance L1a, L2a.

 

[Waqas_azeb]

I don't see how you can assign an inductance to the metal plate. You can model its effect either as a modification of L1 and L2 (reduced inductance, increased loss factor) or by a parallel connected lossy inductance L1a, L2a.

Actually, I dont want to assign inductance to the metal plate. I want to assign current excitation, just for the sake of getting the value of mutual inductance between the plate and the coils. By doing so I can find the mutual inductances but the problem is I cant apply Boolean operations on the metal plate as I cant subtract the bigger box then a smaller one and thats where my problem lies.

 

[volker@muehlhaus]

just for the sake of getting the value of mutual inductance between the plate and the coils

I think you can get mutial inductance by evaluating two simulations:
1. coil alone, no metal plate
2. coil over your plate, using plate material perfect conductor (PEC)

From simulation 1 you get inductance L1
From simulation 2 you get inductance (L1-M)

 

[Waqas_azeb]

Thank you for your reply.

If I will do what you suggested, then I dont think that I would be able to find the mutual inductances between the two coils. I am interested in finding the mutual inductances between each coil with the metal sheet as well as the mutual inductance between the two coils at the same time.

Best,
Waqas

 

[volker@muehlhaus]

at the same time.

What do you mean by "at the same time"? I would simulate this as separate models, to get M between inductor and plate, and then build another (full) model with two inductors to get mutual inductance between the inductors.

 

[Waqas_azeb]

By the same time, I mean to get the simulation results of;

1: The mutual inductance between the metal plate and coil1.
2: The mutual inductance between the metal plate and coil2.
3: The mutual inductance between coil1 and coil 2.