Amorphous core in toroidal power transformer for audio amplifiers of class AB, B, D.
Comparison of the graphs shows that the transformer with an amorphous alloy core has a much higher efficiency than a similar transformer with a core of silicon steel.
It is also obvious that the efficiency of a transformer made of an amorphous alloy is higher in a much wider range of loads, and this is the second advantage over a silicon steel core.
Losses in an amorphous magnetic circuit are six times smaller than in silicon steel.
Such low losses are equivalent when used in the windings of silver wire instead of copper wire or even give an even greater overall effect.
For reference, the cost of silver wire, about 150 times more copper wire.
The overall result will be manifested in the form of a significant decrease in the internal resistance of such a voltage source in comparison with what is done on a conventional core of silicon steel.
https://journal.uptimeinstitute.com/wp-content/uploads/2014/09/91.jpg
In other words, I say that low losses in the magnetic circuit and they are 6 times smaller in an amorphous magnetic core than in silicon steel are good not only for Power Company, but also for audio amplifiers, since they allow reducing the internal resistance of the transformer to alternating current , much cheaper and more efficient than using silver. Many are willing to overpay for silver, getting a small result in reducing resistance and, ultimately, reducing distortion. But few people realized that there is a much cheaper way to reduce distortions in amplifiers that almost nothing will cost you compared to silver, but 1000 times more efficient.
For those who have not understood anything yet. Here is a comparison of the efficiency of a toroidal transformer over an EI transformer.
https://www.plitron.com/wp-content/uploads/2010/02/Picture5-1.png
Toroidal transformers also use the Power Company, but much less often because of their complexity of winding and high cost.
3-Phase Technology™ offers significant advantages.
But are they only good for the Power Company or are they not used in audio amplifiers because of their high efficiency?
Is high efficiency a fictitious obstacle to using toroids in audio? No, of course, it is because of this that they are appreciated and used in audio!
http://the-ear.net/sites/default/files/naim-nap250-dr.jpg
Comparison of the graphs shows that the transformer with an amorphous alloy core has a much higher efficiency than a similar transformer with a core of silicon steel.
It is also obvious that the efficiency of a transformer made of an amorphous alloy is higher in a much wider range of loads, and this is the second advantage over a silicon steel core.
Losses in an amorphous magnetic circuit are six times smaller than in silicon steel.
Such low losses are equivalent when used in the windings of silver wire instead of copper wire or even give an even greater overall effect.
For reference, the cost of silver wire, about 150 times more copper wire.
The overall result will be manifested in the form of a significant decrease in the internal resistance of such a voltage source in comparison with what is done on a conventional core of silicon steel.
https://journal.uptimeinstitute.com/wp-content/uploads/2014/09/91.jpg
In other words, I say that low losses in the magnetic circuit and they are 6 times smaller in an amorphous magnetic core than in silicon steel are good not only for Power Company, but also for audio amplifiers, since they allow reducing the internal resistance of the transformer to alternating current , much cheaper and more efficient than using silver. Many are willing to overpay for silver, getting a small result in reducing resistance and, ultimately, reducing distortion. But few people realized that there is a much cheaper way to reduce distortions in amplifiers that almost nothing will cost you compared to silver, but 1000 times more efficient.
For those who have not understood anything yet. Here is a comparison of the efficiency of a toroidal transformer over an EI transformer.
https://www.plitron.com/wp-content/uploads/2010/02/Picture5-1.png
Toroidal transformers also use the Power Company, but much less often because of their complexity of winding and high cost.
3-Phase Technology™ offers significant advantages.
But are they only good for the Power Company or are they not used in audio amplifiers because of their high efficiency?
Is high efficiency a fictitious obstacle to using toroids in audio? No, of course, it is because of this that they are appreciated and used in audio!
http://the-ear.net/sites/default/files/naim-nap250-dr.jpg
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I managed to find some graphs in a .pdf but don't know how to share the link to it.
One question I have is that although core losses are lower for amorphous (c.f. silicon steel) due to reduced hysteresis and eddy currents, the Bmax is lower. Normally lower Bmax leads to higher copper losses but the graphs/tables even show reduced copper losses for amorphous. I don't understand how.
One question I have is that although core losses are lower for amorphous (c.f. silicon steel) due to reduced hysteresis and eddy currents, the Bmax is lower. Normally lower Bmax leads to higher copper losses but the graphs/tables even show reduced copper losses for amorphous. I don't understand how.
Likewise, I do not know how to attach photos from my computer here.
A lower Bmax leads to higher losses in copper if you wind even more turns than it needs to the same magnetic circuit. In this example, it will not matter on silicone steel or on an amorphous magnetic circuit. In this picture, there is another case. The graph compares two transformers of the same power.
If you look closely at these diagrams, you can mentally create a new one for a silicon steel core, but with a wound silver wire. It will become a little more efficient than with copper wire, especially in the area of heavy load, but still worse than the amorphous core.
A lower Bmax leads to higher losses in copper if you wind even more turns than it needs to the same magnetic circuit. In this example, it will not matter on silicone steel or on an amorphous magnetic circuit. In this picture, there is another case. The graph compares two transformers of the same power.
If you look closely at these diagrams, you can mentally create a new one for a silicon steel core, but with a wound silver wire. It will become a little more efficient than with copper wire, especially in the area of heavy load, but still worse than the amorphous core.
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I have no idea, but would like to learn about this. Can you provide some background sources? (solid engineering stuff, no snake oil gibberish)
Catalog of the company Hitachi suitable?
http://www.hitachi-ies.co.jp/english/catalog_library/pdf/transformers.pdf
There are also articles in Russian, where the history of creation of amorphous power transformers for distribution networks throughout the world is traced, mainly in the USA, Japan, China, India and Russia.
Реферат: Современные конструкции и особенности силовых трансформаторов распределительных электрических сетей
http://www.hitachi-ies.co.jp/english/catalog_library/pdf/transformers.pdf
There are also articles in Russian, where the history of creation of amorphous power transformers for distribution networks throughout the world is traced, mainly in the USA, Japan, China, India and Russia.
Реферат: Современные конструкции и особенности силовых трансформаторов распределительных электрических сетей
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That is for high power plant applications (thousands of kV).
Could you show how this might be interesting for an audio application?
After all this is an audio forum.
Amorphous alloys are used at the output audio transformers, like silicone steel. Amorphous alloy is exactly the same material for sound as silicone steel. The difference is only in the characteristics, but the application areas are the same. Both materials are suitable for audio applications. However, the amorphous alloy is more promising both in the output transformers and in the power transformers, which is shown by the worldwide trend.
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Interesting.
So it does not matter if the material is permalloy, silicon steel, amorphous or nanocrystalline?
It does not matter if the core is square, round or oval (c-core)?
Let me edit too:
So we agree that the differences in character of these core materials have their own sound signature?
And another edit as editing and re-editing your initial post seems to be your strategy of discussion:
Amorphous alloy has been used for quite some years in audio transformers.
I used it until I found nanocrystalline (Finemet) to be even better.
For power transformers I don't see any advantage of using amorphous cores in a domestic hifi situation.
You are right with the application of amorphous cores in high power plants, but that's not my world.
So it does not matter if the material is permalloy, silicon steel, amorphous or nanocrystalline?
It does not matter if the core is square, round or oval (c-core)?
Let me edit too:
So we agree that the differences in character of these core materials have their own sound signature?
And another edit as editing and re-editing your initial post seems to be your strategy of discussion:
Amorphous alloy has been used for quite some years in audio transformers.
I used it until I found nanocrystalline (Finemet) to be even better.
For power transformers I don't see any advantage of using amorphous cores in a domestic hifi situation.
You are right with the application of amorphous cores in high power plants, but that's not my world.
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It is more convenient for you to order in the USA. The manufacturer must also report the power.
Despite the difference in price 80 times, between silver and copper, their difference in resistivity is much less than 3%, but all clearly feel a huge difference in sound. Example output transformers from the UK - Аudio Note. By the way, they also have models with an amorphous alloy magnetic core. Apparently the difference in sound is there. At the same time, the amorphous alloy is not much more expensive than the best silicon steel.
I live in Russia, we have them full. In the US, too, must be. Look, you're closer there ...
Analogues for use:
Finemet – Hitachi, Vitroperm, Nanoperm –Vacuumschmelze.
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You mean while only voltage parameters, you need power, that would be right to choose the envelope of the magnetic circuit. It is also desirable to say whether esst requirements for the overall size, all of a sudden the transformer can not fit in the finished amplifier. Amorphous will be approximately 1.5 times larger.
If you only need one transformer. It's easier for me to find a manufacturer for you in the United States. I will check tomorrow.
Ок?
Unfortunately I do not understand your abbreviations and slang. I'm not a native speaker of English.
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