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Simulation of leakage flux from transformer
Posted Mar 13, 2013, 1:31 a.m. EDT Low-Frequency Electromagnetics, Interfacing Version 4.3a 5 Replies
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Hello.
I've tried to simulate a quantity of leakage flux from transformer by using COMSOL 4.3a. To do this, I made a simple transformer model with LiveLink for AutoCAD.(I want to attach mph file, but its size is too big to attach)
And I chose "mef" module for simulation. But an error message comes out. Here is the message.
The following feature has encountered a problem:
Failed to find a solution.
Divergence of the linear iterations.
Returned solution is not converged.
- Feature: Stationary Solver 1 (sol1/s1)
- Error: Failed to find a solution.
I'm a beginner of COMSOL, so I can't find any solutions to fix this error. Is there any way to fix this error?
Regards,
Mizuki
I've tried to simulate a quantity of leakage flux from transformer by using COMSOL 4.3a. To do this, I made a simple transformer model with LiveLink for AutoCAD.(I want to attach mph file, but its size is too big to attach)
And I chose "mef" module for simulation. But an error message comes out. Here is the message.
The following feature has encountered a problem:
Failed to find a solution.
Divergence of the linear iterations.
Returned solution is not converged.
- Feature: Stationary Solver 1 (sol1/s1)
- Error: Failed to find a solution.
I'm a beginner of COMSOL, so I can't find any solutions to fix this error. Is there any way to fix this error?
Regards,
Mizuki
5 Replies Last Post Mar 18, 2013, 3:52 p.m. EDT
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Posted:
1 decade ago
Hi
the error messages are difficult also for trained users ;) if that is of any help ...
First of all MEF is a heavy solver looking after both A (magnetic) and V the voltage, do you really need the V in your case ? Else MF is lighter, often its worth to start simple i.e. in MF solving only for A then when it works OK add replace by MEF to add V effects hence you know if the issue is from A or V, now you cannot.
A common ewrror in MEF is to forget to give a conductivity for all domains (even the air) , or define a node for domain(s) using only MF as a sub node to MEF (then you do not need any conductivity
--
Good luck
Ivar
the error messages are difficult also for trained users ;) if that is of any help ...
First of all MEF is a heavy solver looking after both A (magnetic) and V the voltage, do you really need the V in your case ? Else MF is lighter, often its worth to start simple i.e. in MF solving only for A then when it works OK add replace by MEF to add V effects hence you know if the issue is from A or V, now you cannot.
A common ewrror in MEF is to forget to give a conductivity for all domains (even the air) , or define a node for domain(s) using only MF as a sub node to MEF (then you do not need any conductivity
--
Good luck
Ivar
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Posted:
1 decade ago
hello,
Thank you for advices. And I attach a zip file which is mphbin file. By the way, I'm trying to simulate with MF module, but I can't define current in winding. When I want to simulate flux leakage, isn't current definition needed?
Regards,
Mizuki
Thank you for advices. And I attach a zip file which is mphbin file. By the way, I'm trying to simulate with MF module, but I can't define current in winding. When I want to simulate flux leakage, isn't current definition needed?
Regards,
Mizuki
Attachments:
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Posted:
1 decade ago
Hi
first of all you do not really need to zip a mph file its already zip type. ;)
It's better to EDIT clear all solution - clear all mesh - File reset history - File Save as new_name, then upload
You have added only the geometry there, in MF add a "single turn coil domain" (as you have modelled the turns there), then to single turn coil add a boundary sub node (for example onto 5 and a gnd sub node to 32
use a "fine" mesh in automatic mode, or select a finer one only for the coil domain
You need to add Ampere Law node specifically for the soft iron if you have a BH curve to use
Check the model library Single_coil_boundary_feed.mph or ask support for it if its not in the model gallery
The main issue you will have is the mesh density, you need a few elements between the coil windings to resolve the air part correctly, one way to improve the mesh locally is to surround the coil by a tube a few mm outside of the coil and mesh fine this region
--
Good luck
Ivar
first of all you do not really need to zip a mph file its already zip type. ;)
It's better to EDIT clear all solution - clear all mesh - File reset history - File Save as new_name, then upload
You have added only the geometry there, in MF add a "single turn coil domain" (as you have modelled the turns there), then to single turn coil add a boundary sub node (for example onto 5 and a gnd sub node to 32
use a "fine" mesh in automatic mode, or select a finer one only for the coil domain
You need to add Ampere Law node specifically for the soft iron if you have a BH curve to use
Check the model library Single_coil_boundary_feed.mph or ask support for it if its not in the model gallery
The main issue you will have is the mesh density, you need a few elements between the coil windings to resolve the air part correctly, one way to improve the mesh locally is to surround the coil by a tube a few mm outside of the coil and mesh fine this region
--
Good luck
Ivar
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Posted:
1 decade ago
hello,
thank you for advices. To make simulation easy, I made three turns coil model covered with a tube(Please check attached file).
I chose MF module and used single turn coil domain. In single turn coil domain, I chose Boundary Feed for 26, and Ground for 19. But the same error message came out. Is a cause of this error mesh too?
Element size(Free tetrahedral):
windings:fine
tube:fine
air:fine
Regards,
Mizuki
thank you for advices. To make simulation easy, I made three turns coil model covered with a tube(Please check attached file).
I chose MF module and used single turn coil domain. In single turn coil domain, I chose Boundary Feed for 26, and Ground for 19. But the same error message came out. Is a cause of this error mesh too?
Element size(Free tetrahedral):
windings:fine
tube:fine
air:fine
Regards,
Mizuki
Attachments:
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Posted:
1 decade ago
Hi
Sorry I should have expressed myself better (but I tried myself without getting to a good result) its the cylindrical part I was thinking of embedding inside a tube shape, or even two cylinders. because you have a small gap between the windings, and you need a few elements in between, your domain to mesh is complex for the meshing algorithm (looping topology is tricky and you have large differences in section/gaps. Your issue is to get a good mesh all around the coil. then get it coarser towards the external air domain, else you would run out of RAM before finishing ;)
You could also consider a cylinder section and the "multi-turn coil domain" rather than the detailed coiled wire
--
Good luck
Ivar
Sorry I should have expressed myself better (but I tried myself without getting to a good result) its the cylindrical part I was thinking of embedding inside a tube shape, or even two cylinders. because you have a small gap between the windings, and you need a few elements in between, your domain to mesh is complex for the meshing algorithm (looping topology is tricky and you have large differences in section/gaps. Your issue is to get a good mesh all around the coil. then get it coarser towards the external air domain, else you would run out of RAM before finishing ;)
You could also consider a cylinder section and the "multi-turn coil domain" rather than the detailed coiled wire
--
Good luck
Ivar