I was reading a Japanese enameled wire spec here , and I noticed that the Japanese spec said that wire type EIW, which is a polyester imide wire, suffers from a ringing phenomenon. Does anyone know what they're talking about? Like under what conditions the ringing occurs?

Thanks!

 

A WAG
Maybe they are talking about insulation treeing or cracks.
https://www.researchgate.net/public...Film_on_Magnet_Wire_for_Electromagnetic_Coils

 

I was reading a Japanese enameled wire spec here , and I noticed that the Japanese spec said that wire type EIW, which is a polyester imide wire, suffers from a ringing phenomenon. Does anyone know what they're talking about? Like under what conditions the ringing occurs?

Thanks!

What sort of publication was this in?? An audiophile magazine may have been referencing some imaginary thing that is complex to measure, as an example. In a parallel conductor cable it may be that dielectric absorbtion could cause apparent oscillations under some specific conditions. Those are two guesses

 

What sort of publication was this in??

The publication, of magnet wire specs, was from a manufacturer that I linked in the blog post.

 

I wondered if maybe there was a different way to translate the statement on ringing, so I tried just a bit of it and the translation went from "ringing" to "crazing", which "is a condition in which the surface of parts such as paint or synthetic resin is oxidized by sunlight, resulting in minute cracks." -- Wikipedia

So maybe they're just saying that the enamel is vulnerable to UV degradation?

 

I wondered if maybe there was a different way to translate the statement on ringing, so I tried just a bit of it and the translation went from "ringing" to "crazing", which "is a condition in which the surface of parts such as paint or synthetic resin is oxidized by sunlight, resulting in minute cracks." -- Wikipedia

So maybe they're just saying that the enamel is vulnerable to UV degradation?

If that is what they meant they certainly used a fair amount of obfuscation. A skillful way to hide that the enamel is vulnerable to UV degradation.

 

I wondered if maybe there was a different way to translate the statement on ringing, so I tried just a bit of it and the translation went from "ringing" to "crazing", which "is a condition in which the surface of parts such as paint or synthetic resin is oxidized by sunlight, resulting in minute cracks." -- Wikipedia

So maybe they're just saying that the enamel is vulnerable to UV degradation?

That sounds about right, I worked for a Japanese company for years, typical translations were a times, mystical (battery -> lead accumulator was a good one). I've use polyester imide wire and insulation tapes in productions tools. It does have a tendency to become brittle and crack when bend. It's not really UV degradation, the insulation will debond from the copper surface during a high stress event like a very high current pulse from a motor or load fault.
https://www.sae.org/publications/technical-papers/content/2022-01-0334/

 

It can operate from up to 600V supply voltage and it can operate with as few as one LED, but it cannot do both at the same time. It is limited by the power dissipation.

Let’s say you have one 20 mA LED with forward drop of 3V. Then with 600V inout the chip will drop 597V. At 20 mA, that is 11.9W of power. Poof!

With a string of 150 of these LEDs, the left over voltage is 150V and the power is 3W. Maybe not an immediate poof but still not good.

Put 195 in series and the reaming voltage is 15V and power is 0.3W. That’s a go!