1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA IPDP 1-2018Magnet Wire Insulation Removal MethodsA NEMA Magnet Wire Section Document IPDP 1-2018 Magnet Wire Insulation Removal Methods Prepared by Magnet Wire Section National Electrical Manufacturers Association 1300 North
2、 17thStreet, Suite 900 Rosslyn, Virginia 22209 The requirements or guidelines presented in this document are considered technically sound at the time they are approved for publication. They are not a substitute for a product sellers or users own judgment with respect to the particular product discus
3、sed, and NEMA does not undertake to guarantee the performance of any individual manufacturers products by virtue of this document or guide. Thus, NEMA expressly disclaims any responsibility for damages arising from the use, application, or reliance by others on the information contained in these whi
4、te papers, standards, or guidelines. The opinions expressed in this statement represent the consensus views of the member companies of the Magnet Wire Section of the National Electrical Manufacturers Association. www.nema.org 2018 National Electrical Manufacturers Association. All rights, including
5、translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. NEMA IPDP 1-2018 Page 2 2018 National Electrical Manufacturers Association Introd
6、uction This purpose of this white paper is to describe known methods for removing insulation from finished magnet wire products, including how insulation removal is achieved, the typical applications for each method, and the safety precautions magnet wire users should consider when conducting magnet
7、 insulation removal operations. Magnet Wire Insulation Removal Methods Mechanical Stripping This method involves the removal of magnet wire insulation from copper or aluminum conductors using sandpaper, sharp objects, such as a razor blade, or spinning abrasive wheels or rotating blades. This proces
8、s is the most efficient method to remove the magnet wire insulation when the condition or precise measurement of the bare conductor is not critical once the insulation is removed. Most Common Applications: For quick point-to-point or single-point insulation removal prior to making electrical termina
9、tions, such as soldering, welding, or crimping. Hazards: Exercise caution to avoid cuts from sharp objects or abrasion burns from spinning abrasive wheels. Removal of dust and contamination control should be considered for critical applications. Welding Some insulation materials can be removed when
10、welding the terminations by applying a high amount of current for a limited amount of time. Most Common Applications: Welding terminations on motor stators or alternators without prior insulation removal. Works well on most but not all insulations; for example, welding does not work well on polyimid
11、es and fiberglass served insulations. The burn-back / insulation degradation near the termination can be better controlled through fast welding. Hazards: Use equipment / protection to prevent skin burns due to the high temperatures required to remove the insulation. The burnt area should be cooled b
12、efore further processing. Volatile fumes emitted from the degradation of the insulation should be vented.iChemical Stripping Chemical stripping is a method that involves the use of a known magnet wire chemical stripper to remove the insulation. Some chemicals can strip off the insulation when the st
13、ripper is kept at room temperature, while others require bringing the chemical stripper to an elevated temperature by use of a hot plate to decrease stripping time. This is best used for instances where the surface condition of the bare uninsulated conductor is critical. Time to strip can vary and c
14、omplete removal of any residual chemical stripper is required. Most Common Applications: For testing to calculate dimensions in insulation builds over the bare conductor. Hazards: Exercise caution to avoid chemical burns or burns from the use of the hot plate. Face and eye protection is recommended
15、to avoid a splash hazard. Complete removal of the residual chemical stripper is required to eliminate any corrosive damage to finished parts. NEMA IPDP 1-2018 Page 3 2018 National Electrical Manufacturers Association Soldering Solderable magnet wire insulation can be removed as the wire is soldered
16、to a terminal without prior physical removal of the insulation. Most Common Applications: Soldering magnet wire to terminals on a printed circuit board or other electronic devices by dipping the terminations into molten solder. Hazards: Use equipment / protection to prevent skin burns. The volatile
17、fumes being emitted during soldering should be vented. Exercise caution for possible exposure to tin or lead solders. Flame Stripping This method involves the use of a torch or other high-temperature flame application to remove the insulation, typically followed by a brief water quench. This is best
18、 used for those cases where the surface condition of the bare uninsulated copper is critical, particularly for finer wire sizes or lower temperature class insulations. The type of enamel, construction, size, and build of the wire will vary the duration or intensity of the flame application to burn t
19、he enamel off. A brief quench in water or other non-reactive solution after the enamel is burnt off will quickly cool and stop excessive oxidation of the conductor. Most Common Applications: For testing to calculate dimensions in insulation builds over bare copper conductor. Flame stripping is gener
20、ally not used for removing the insulation from aluminum conductors as the aluminum will likely melt. Flame stripping is not localized and therefore the burn back / insulation degradation near the burn area may limit its use for finished parts. Hazards: Use equipment / protection to prevent skin burn
21、s due to the high temperatures required to remove the insulation. The burnt area should be cooled before further processing. The open flame should be isolated to prevent ignition of other materials in close proximity to where the insulation is being removed. The volatile fumes being emitted from the
22、 degradation of the insulation should be vented. Laser Stripping The laser stripping method involves the use of a laser to more precisely remove the magnet wire insulation at one or more points along the wire length or where risk of chemical contamination must be minimized. It has been noted that th
23、is process can cause some irregularities on the surface of the bare copper once the insulation is removed. At the time this paper was written, this method was fairly new to the magnet wire industry. Most Common Area of Use: Where there is a need to have multiple precision stripped areas along short
24、or long lengths of wire with minimal damage or contamination to the wire. Hazards: Proper laser-approved protection glasses and gloves are recommended to prevent burns from use of the laser. iSee OSHA Regulation 29 CFR 1910, Part 134a), Occupational Safety and Health Standards, Personnel Protective Equipment, Permissible Practice. NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
