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Toroidal transformers
Toroidal transformers
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Old 13th September 2021, 10:45 PM   #1
intojazz is offline intojazz  United States
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Default Toroidal transformers

Purchased a Antek AS 4218 transformer and see that itís not round. The outer wrapping is not damaged but the donut, if you will, is clearly not round. I suspect this is not an issue but had to ask. The picture doesnít really show it very well but I wonder if this is because of the rather large gauge secondary wires?
I havenít used a toroidal before so this seems like a total rookie question
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Old 13th September 2021, 11:07 PM   #2
H713 is offline H713  United States
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Not a problem, they're all like that. It's got to do with the shielding they use and the input / output connections. Ends up with a couple bumps.

I would not worry.
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Old 13th September 2021, 11:47 PM   #3
rayma is online now rayma  United States
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The core is perfectly round, and then wires etc are added around and on it.

The most popular rookie mistake is to connect both ends of the mounting bolt
galvanically to the metal chassis. That would cause a magnetic short circuit.
Only one connection is allowed.

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Old 14th September 2021, 12:27 AM   #4
Mr_Zenith is offline Mr_Zenith  United States
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Toroidal transformers
Absolutely not an issue, as the others have stated. Mount it well, hook it up, and enjoy!
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Old 14th September 2021, 02:15 AM   #5
intojazz is offline intojazz  United States
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Excellent, thanks!
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Old 14th September 2021, 02:19 AM   #6
abraxalito is offline abraxalito  United Kingdom
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Do to the deviation from being perfectly circular, the magnetic fields around the trafo aren't equally uniform. Its best to orient the trafo so that the lead-outs are furthest from the sensitive circuits (input stage of your amp for example).
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Old 14th September 2021, 02:42 AM   #7
intojazz is offline intojazz  United States
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I wondered that, so much to learn and remember.
Old guy issues ��
Thanks Abraxalito
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Old 14th September 2021, 03:00 AM   #8
H713 is offline H713  United States
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Quote:
Originally Posted by abraxalito View Post
Do to the deviation from being perfectly circular, the magnetic fields around the trafo aren't equally uniform. Its best to orient the trafo so that the lead-outs are furthest from the sensitive circuits (input stage of your amp for example).

I'm not sure that's quite right. As Rayma mentioned, the core itself IS perfectly circular (or very close to it). The tape-wound cores they use are reasonably decent and the radius should be very consistent.

There will be some stray magnetic fields caused by the lead-in / lead-out wires themselves (twisting them helps those fields cancel).
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Old 14th September 2021, 06:20 AM   #9
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by H713 View Post
As Rayma mentioned, the core itself IS perfectly circular (or very close to it). The tape-wound cores they use are reasonably decent and the radius should be very consistent.
Yes, no disagreement there.

Quote:
There will be some stray magnetic fields caused by the lead-in / lead-out wires themselves (twisting them helps those fields cancel).
Yes, twisting them helps with the fields created by the current flow in the lead-out wires. But there's still more flux leakage from the core (even when zero current drawn from secondaries) where the lead-out wires are as uniformity of flux requires geometric uniformity of windings around the core too.

When I wrote 'deviation from being perfectly circular', I wasn't referring to the core, rather the lead-outs of the windings are the irregularity.
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Old 14th September 2021, 10:48 AM   #10
NareshBrd is offline NareshBrd  India
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Much better in this regard than E-I cores.
Don't worry too much.
Can you connect the mounting bolt to Earth directly?
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