Revision Simplifies Magnet Wire Production

Revision Simplifies Magnet Wire Production

This piece was originally published in the November 2016 issue of electroindustry.

Mike Leibowitz, Program Manager, NEMA

Coil winding machine

The 2016 edition of ANSI/NEMA MW 1000, the premier standards publication for general requirements, product specifications, and test procedures for the manufacture and packaging of magnet wire, was recently released. It aims to help streamline certain aspects of magnet production and testing.

One revision is the adoption of the International Electrotechnical Commission (IEC) approach to dimensional requirements for glass fiber–covered and polyester glass fiber–covered round magnet wire. Compared to the legacy NEMA requirements, the IEC methodology provides manufacturers with a smoother mathematical progression in minimum insulation increases with increasing wire size.

Another revision replaces the dimensional requirements for rectangular wire with the IEC progression of dimensions for fibrous, covered rectangular wire, and to simplify the standard, making the requirements less prone to misinterpretation.

Finally, MW 1000 now provides the option to test a wider range of magnet wire sizes for dielectric breakdown using the cylinder method, to include 24–38 AWG. Another expansion is planned to allow this method for wire sizes up to 14 AWG. This method is often more convenient for testing wire than making twisted pair specimens.

Revisions to MW 1000 also include new specifications that define the requirements for Class 120 polyvinyl acetal film insulated wire constructions.

Developed by the NEMA Magnet Wire Section, MW 1000 is employed by a wide range of industries, such as energy transmission, automotive, appliances, medical, aerospace, and electronics.

ANSI/NEMA MW 1000-2016 is available in hard copy or as an electronic download for $153 on the NEMA website.

Read the November 2016 issue of electroindustry.

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