Spencerleehorton
Well-known member
Hi,
Had a few ideas about making my own core for transformers and wanted to share and get some info.
I am aware that these are just ideas and probably have been thought of before and therefore already not been used for reason I'm not aware of, but that is really what I would like to find out.
Bobbin - with a lathe I can make a bobbin fairly easily from various plastics
Permalloy seems to be a good material to use as this is available in sheets.
My idea has ranged from using wire through the core area or sheets as per the EI standard way of doing things.
I understand that normally each sheet of the lams is insulated on the flat surface but not on the sides so the E and I connects continuity wise when put together, and I'm assuming this helps the magnetic field to radiate?
Each lam working independently of each other so to speak rather than a big lump, this must be so the direction of the flux is limited or rather forced to work across the lams? (Physics isn't my strong point!)
One ideas I had was to thread a insulated permalloy wire through the core, making two horse shoe type shapes then connecting each wire at the bottom, quite a task but using quite thick material I'm sure it could be done in principle, the only draw back would be each wire would only essentially not be insulated at the end, as compared to a lam where it is only insulated on top and bottom flat surface?
In principle what negative or positive effect would this have?
My second idea would be to use permalloy sheet and you can get this insulated on one side and has sticky on the other, so essentially insulated on both sides, if this could be wound starting inside the bobbin, having both coils going round as per an E and I would be, this in my mind would be much better.
Only draw backs I can see then is each wind round the bobbin would be one long piece of permalloy, what effect would this have? Negative and positive?
And it would have to be wound tight enough.
Would be interested in your thoughts.
Regards
Spence.
Had a few ideas about making my own core for transformers and wanted to share and get some info.
I am aware that these are just ideas and probably have been thought of before and therefore already not been used for reason I'm not aware of, but that is really what I would like to find out.
Bobbin - with a lathe I can make a bobbin fairly easily from various plastics
Permalloy seems to be a good material to use as this is available in sheets.
My idea has ranged from using wire through the core area or sheets as per the EI standard way of doing things.
I understand that normally each sheet of the lams is insulated on the flat surface but not on the sides so the E and I connects continuity wise when put together, and I'm assuming this helps the magnetic field to radiate?
Each lam working independently of each other so to speak rather than a big lump, this must be so the direction of the flux is limited or rather forced to work across the lams? (Physics isn't my strong point!)
One ideas I had was to thread a insulated permalloy wire through the core, making two horse shoe type shapes then connecting each wire at the bottom, quite a task but using quite thick material I'm sure it could be done in principle, the only draw back would be each wire would only essentially not be insulated at the end, as compared to a lam where it is only insulated on top and bottom flat surface?
In principle what negative or positive effect would this have?
My second idea would be to use permalloy sheet and you can get this insulated on one side and has sticky on the other, so essentially insulated on both sides, if this could be wound starting inside the bobbin, having both coils going round as per an E and I would be, this in my mind would be much better.
Only draw backs I can see then is each wind round the bobbin would be one long piece of permalloy, what effect would this have? Negative and positive?
And it would have to be wound tight enough.
Would be interested in your thoughts.
Regards
Spence.