×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Wire Quality Inspection

Wire Quality Inspection

Wire Quality Inspection

(OP)
I am wanting to start in incoming inspection process on both round and rectangular magnet wire.  What are the critical features I must measure in order to evaluate the wire quality?  Does anyone have a feel of minimum acceptable dielectric breakdown voltages?    
Thanks.  MBailey.

RE: Wire Quality Inspection

Consult NEMA Std Publication No. MW 1000, Magnet Wire.

RE: Wire Quality Inspection

(OP)
NEMA is the absolute minimum standard which any wire supplier should be capable of meeting.  It was written by the wire manufactures, not the wire users.  Of the parameters listed in NEMA, which ones are the most important?  Which ones require measurement?  Thanks, mbailey

RE: Wire Quality Inspection

I'm working for an outfit that makes linear motors. They design their own coils and make their own stators. They worry about operating temperature and specify 200 C rating or higher, which seems to automatically mean the double thick stuff. The winders like the toughness of that insulation, and having tried to wire brush it off, I concur the insulation is resistant to abrasive damage and TOUGH. Still, I believe the failures they've had have been related to mechanical insulation damage, not so much during coil winding but from installation in the back iron which they make too snug due to deep seated fears of an extra mm of potting material causing overheating.

RE: Wire Quality Inspection

(OP)
Thanks Tmoose,

I trying to develop a specification that will apply minimum limits to such tests as the Thermoplastic Flow and Dielectric Breakdown Voltages as well as burrs and conductor damage.  I'm looking for requirements that others may have experience with because the NEMA MW-1000 standard is only an industry minimum. We use the dual film wire with EAI base coat and AI top coat also and although it may be tough, how tough do we want it and how do you measure that toughness?  Are others testing the wire that they receive from wire suppliers and what testing do they do?

Thanks, mbailey

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources