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[Electrostatic 3.5a]Capacitance variation
Posted Oct 16, 2009, 6:34 a.m. EDT 3 Replies
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Hello
I realized 3D model with 2 parallel blocks, one is the capacitor and the second is the mass. I must calculate the capacitance between two objects so i assign these boundary conditions:
Capacitor: Port number 1
I realized 3D model with 2 parallel blocks, one is the capacitor and the second is the mass. I must calculate the capacitance between two objects so i assign these boundary conditions:
Capacitor: Port number 1
3 Replies Last Post Oct 17, 2009, 5:11 p.m. EDT
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Posted:
2 decades ago
Sorry I had some troubles with pc...so I continue to explain:
Capacitor: Port number 1
Input property:forced voltage
I also use it as input , 1V
Mass Port number 2
Input prop, forced voltage
I create a third block that simulate the environment(boundaries condition for environment zero charge/symmetry) and at the end I launch the analysis.
In global variables I find ther capacitance between the 2 blocks C12_emes and i find the results that is around the value of experimental evaluation. The problem is that if I change the dimensions of the environment block with the same conditions I find different values of capacitance.
So I would ask if i make some errors in the simulation.
Thank you in advance
Luca
Capacitor: Port number 1
Input property:forced voltage
I also use it as input , 1V
Mass Port number 2
Input prop, forced voltage
I create a third block that simulate the environment(boundaries condition for environment zero charge/symmetry) and at the end I launch the analysis.
In global variables I find ther capacitance between the 2 blocks C12_emes and i find the results that is around the value of experimental evaluation. The problem is that if I change the dimensions of the environment block with the same conditions I find different values of capacitance.
So I would ask if i make some errors in the simulation.
Thank you in advance
Luca
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Posted:
2 decades ago
Does the "environment" block encompass your two other blocks (your blocks are within the environment block?)
Remember when dealing with capacitances you get fringe fields and depending on your seperation between the capcitor block and the mass block the fringe fields may be interacting with the boundaries of the environment block, therefore as you change the enviroment block dimensions your capacitance value changes.
Make you environment block as large as possible, certainly the distance of one of your enviro block walls to either the cap or mass block should be at least twice the seperation distance from between cap block and mass block.
Hope this helps?
Regards,
Tom
Remember when dealing with capacitances you get fringe fields and depending on your seperation between the capcitor block and the mass block the fringe fields may be interacting with the boundaries of the environment block, therefore as you change the enviroment block dimensions your capacitance value changes.
Make you environment block as large as possible, certainly the distance of one of your enviro block walls to either the cap or mass block should be at least twice the seperation distance from between cap block and mass block.
Hope this helps?
Regards,
Tom
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Posted:
2 decades ago
Hi
have you checked out the latest models in the "ModelExchange" ? I believe you can find some useful hints there ! Konrad Walus of University of British Columbia has just deposited quite some nice models there
Good luck
Ivar
have you checked out the latest models in the "ModelExchange" ? I believe you can find some useful hints there ! Konrad Walus of University of British Columbia has just deposited quite some nice models there
Good luck
Ivar