make up natural cara make up make up tutorial make up korea make up minimalis make up artis make up mata belajar make up make up wardah alat make up makeup forever indonesia makeup artist jakarta tips make up barbie make up natural make up make up wajah make up pesta make up syahrini makeup mata makeup minimalis peralatan make up make up cantik make up mac make up kit jual make up make up sederhana perlengkapan make up gambar make up vidio make up cara makeup minimalis wardah make up make up pac make up glamour cara memakai makeup make up panggung harga make up make up modern make up alami make up dasar pixy make up make up muslimah make up oriflame make up jepang makeover cosmetic make up ultima make up sariayu grosir make up makeup fantasi makeup pesta tas makeup langkah make up make up pria make up malam alat makeup tahapan make up produk make up shading make up mak up make up kebaya make up jilbab make up inez make up simpel contoh make up cara ber makeup makeup wajah tanpa make up make up terbaru toko make up mac makeup indonesia make up soft urutan make up trik make up makeover makeup brand gusnaldi make up paket make up panduan make up jual makeup brush make up bagus alat2 make up make up gusnaldi aplikasi make up alat alat makeup dasar make up inez make up peralatan makeup make up wanita make up berjilbab make up tebal sejarah make up make up maybeline make up branded make up siang tata cara makeup reseller make up make up muslim make up maybelin warna make up tips make up artist rias make up make up mata make up artis belajar make up make up artist kursus make up kuas make up make up forever indonesia jual make up mac indonesia make up make up artist indonesia harga make up forever jual make up online make up pac make up forever jakarta make up oriflame jual make up forever make up online shop indonesia harga make up sekolah make up grosir make up harga make up maybelline jual make up murah make up terbaru mak up mac make up indonesia sofia make up make up kit murah mac makeup indonesia produk make up jual make up kit make up store indonesia make up forever academy jakarta toko make up online jual make up set jual make up mac make up beauty jual make up branded produk make up mac make up forever harga make up mac indonesia produk make up artis jual make up palette produk make up forever make up palette murah before after make up pengantin before after make up sendiri before n after hasil makeup contoh make up karakter contoh riasan pengantin before n after harga make up wisuda harga make up artist harga make up forever make up wisuda rias wisuda di jogja Daftar harga make up forever daftar harga make up mac daftar harga kosmetik make up forever makeup wisuda harga makeup wisuda kursus make up di yogyakarta kursus make up di jogja kursus make up jogja kursus make up yogyakarta kursus kecantikan di yogyakarta kursus kecantikan di jogja kursus make up artist di jogja kursus rias pengantin di jogja kursus rias di yogyakarta kursus tata rias di yogyakarta rias pengantin muslim jogja jasa kreasi jilbab wisuda yogyakarta jasa rias make up wisuda murah bagus bisa dpanggil tempat make uf di jigja yang bagus rias wisuda murah dan berkualitas yogyakarta pakar kreasi jilbab di jogja make uper natural yogya make up wisuda hijab area jogja make up dan kreasi jilbab yang bagus di jogja jasa make up natural untuk wisuda jogja makeup jogja make up jogja makeup yogyakarta make up yogyakarta makeup wisuda jogja make up wisuda jogja make up wisuda yogyakarta makeup wisuda yogyakarta
Search - People/Events
Search - Content
Search - Industry
Search - Forums
Search - Newsfeeds



jobcenterbanner

FacebookLinkedinPinterestYoutube
Welcome, Guest
Username: Password: Remember me
If you have a question regarding coaxial, telephone, and building wire, power cable, insulation, extrusion, bunching, stranding, braiding, etc. post it here.
  • Page:
  • 1
  • 2

TOPIC: Heat Shock test For Magnet Wire

Heat Shock test For Magnet Wire 2 years 7 months ago #299

I am having problem with Heat Shock of Wires produced with different wire enamels.

I do have some knowledge regarding production of magnet wires and I have already tried quite a few combinations but I am still far away from a solution.

The enamels I have tried are produced by known and reputed manufacturers of the world such as Hitachi in Japan and Malaysia, SIVA in Italy, Schenectady in the USA, Altana in Italy and so on.

I have tried different temperatures in the oven and different speeds.

I have tried variable passes in the oven ....all the results are OK but heat shock!

I have also tried Polyester-imide based,PVF based varnish and have checked as per relevant BSS Specs but the results are still the same.

If you need any other details please inform.

Thanks.
The administrator has disabled public write access.

Re: Heat Shock test For Magnet Wire 2 years 7 months ago #300

Hello,

For a start, we suggest you read this two page WAI Forums thread from 2006 very carefully:

www.wireassociation.com/forum/viewmessag...fm?Forum=8&Topic=277

Likewise please note the comments regarding the Dansk system for tangent delta equipment www.dse.dk and the pull mandrel test.

Since you have tried many enamel manufacturers, it would seem to us that it is indeed your process. We would guess that you are slightly over curing the enamels.

Thank you.

Regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
519 641-3212
The administrator has disabled public write access.

Re: Heat Shock test For Magnet Wire 2 years 7 months ago #301

What ever came of this heat processing idea? I am anxious to hear a little bit more about what happened and why this process was not going according to plan?


C

www.bwire.com/
The administrator has disabled public write access.

Re: Heat Shock test For Magnet Wire 2 years 7 months ago #302

Peter,
I'll comment tomorrow. I've tried twice and don't know where my repy went. Will do in word and then paste.
richard
The administrator has disabled public write access.

Re: Heat Shock test For Magnet Wire 2 years 7 months ago #303

Hello,

Heat shock is generally thought of as a test of cure (or over cure). As you say the enamels you are using are from reputable companies. You take a sample, elongate it some, wrap it around a mandrel, and then place in a lab oven for a period of time at a temperature that is 20 degrees hotter than the thermal rating of the wire.

Over the years I have learned a few things:

1) Get input from the enamel supplier as to suggested temperature profile in the oven.
2) Get input from the oven manufacturer regarding what they think are good temperature speeds.

The best performance occurs when you set the temperature profile, air flow, fan speed, and wire speed for each type enamel and wire size. This means you are operating at optimal conditions.

If you try to run all products and enamels and only vary the speed, you compromise production and quality.

There is no normal reason that I can think of that all of your enamels would fail heat shock. My first thought is that I would check the accuracy of my test oven. Normally heat shock tests are 20 degrees over the thermal rating of the wire for a specific time. If your oven is off even a little it would make a difference.

If the lab oven temperatures are good, then you need to look at your oven. Maybe you have a hot spot or the wire is dragging on the oven or touching a heating element (assuming they are in the wire chamber).

- Is the wire centered in the wire chamber?
- Is it too close to one wall?
- Are you running the oven too hot?
- What kind of oven are you using? Electric? Radiant? Recirculating? Single direction air flow?
- Does the air flow with the direction of the wire or against the movement of the wire?

There are a lot of questions that perhaps you can answer.

Richard
The administrator has disabled public write access.

Re: Heat Shock test For Magnet Wire 2 years 7 months ago #304

For a definition of Heat shock go to www.spsx.com/uploadedFiles/News/White_Pa...al-class-ratings.pdf

The idea behind heat shock is to see if rapidly changing the temperature of the wire will make it fail. Typically you elongate the wire, make a coil, hang in an oven heat opeating at 20 degees C above it thermal rating of the wire. After a period of time you remove the sample, let it air cool and check for cracks in the insulation. You mention BSS specs - is that a Boeing spec. Exactly what is that standard. If it exceeds the basic NEMA heat shock requirements your samples may fail. In NEMA once you reach 200 degree rated wire the oven temp is the same as the rating of the insulation. If it placed in an oven that is too hot or stays in too long it will fail!
The administrator has disabled public write access.
  • Page:
  • 1
  • 2
Time to create page: 0.287 seconds