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Power transformers, winding order
Power transformers, winding order
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Old 11th September 2019, 04:17 PM   #1
xavirom is offline xavirom  Argentina
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Question Power transformers, winding order

Hi. When I learned to calculate and build transformers with an iron core, I did it assuming that the primary winding is the one that coils first, that is, near the core, and the secondary windings, above the primary. I have also seen and built other windings in halves. Recently I discovered that a large number of amplifiers (Technics, JVC, Toshiba, etc.) first build the secondary and on top of it, the primary. Does this have any advantages or disadvantages that windings the other way?
Primary = line input
Secondary = useful output
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Old 11th September 2019, 04:18 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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It has been done so to comply with class 2 or double insulation directives.

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Old 11th September 2019, 05:54 PM   #3
xavirom is offline xavirom  Argentina
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Thanks.

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Old 11th September 2019, 06:09 PM   #4
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Where (What zone) are you? Me now in CABA (Job) but I live in GBA (Almirante Brown). You?
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Old 11th September 2019, 06:48 PM   #5
xavirom is offline xavirom  Argentina
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Rosario, Santa Fe
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Old 11th September 2019, 07:14 PM   #6
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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OK, rosarigasino.
Separating the primary and secondary wine leakage inductance bigger but capacitive coupling lower. This increase the isolation between windings but decrease the electrical performance of the trafo. But in some instances it is mandatory the use of such a transformers.
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Old 11th September 2019, 07:28 PM   #7
xavirom is offline xavirom  Argentina
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Si, jaja..
Thanks for information.
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Old 12th September 2019, 12:59 AM   #8
PRR is offline PRR  United States
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To a first approximation, it does not matter. ALL the turns are 99+% coupled together.

In some work, it is expedient to wind the primary (a standard design) ahead of time, and then wind a secondary to the customer's need.

In practice, some plans work better than others. Primary is usually thin wire. Bending FAT (how-V high current) secondary wire around fine-wire winding is liable to crush and cut the fine wire winding. Starting with the fat wire you have solid support from bobbin or mandrel, you can lay the fat wire tight and leave good support for the fine secondary. OTOH a high-voltage winding (for tubes) might lay better when put on last. Of course all influenced by operator preference and how much fishpaper can be laid between windings.
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Old 12th September 2019, 02:09 AM   #9
TonyTecson is offline TonyTecson  Philippines
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Power transformers, winding order
Quote:
Originally Posted by xavirom View Post
Hi. When I learned to calculate and build transformers with an iron core, I did it assuming that the primary winding is the one that coils first, that is, near the core, and the secondary windings, above the primary. I have also seen and built other windings in halves. Recently I discovered that a large number of amplifiers (Technics, JVC, Toshiba, etc.) first build the secondary and on top of it, the primary. Does this have any advantages or disadvantages that windings the other way?
Primary = line input
Secondary = useful output
i have repaired a lot of japanese audio amplifiers and the way they did their traffos was to use bobbins that you can actually separate the primary coils from the secondary coils, each with its own coils forms...

this i would say is a very neat way to convert from the 100 volt japanese standard line voltage to the 230 volt standard in my country..

and the good thing is that the secondary is left untouched....
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Old 12th September 2019, 02:15 AM   #10
TonyTecson is offline TonyTecson  Philippines
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Power transformers, winding order
when doing traffos with dual bay bobbins, then it does not matter which coils to wind first...

Click the image to open in full size.
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