Technical parameters For Enameled Wire
Despite its simple appearance, enamelled wire is a sophisticated product. The enamelled wire must withstand the mechanical stresses due to bending and stretching during coil winding, which is typically executed at the fastest speed possible in order to increase productivity.
Also, during nominal operation (and overload events) the mechanical forces, thermal stress, as well as chemical and environmental conditions require certain level of performance from the wire and its insulation, so that a reasonable life time can be expected.
The frequently used grades have their technical parameters standardised by international standards such as: IEC 603176), NEMA MW10007), and JIS C32028).
For example, for round enamelled wires the following parameters are defined or controlled: 9)
dimensions (diameter)
adherence
mechanical flexibility (resistance of enamel to cracking)
elongation (due to tension required during winding)
heat shock resistance
spring back (after bending)
dielectric breakdown strength
completeness of cure (of the enamel)
solderability (ease of applying solder directly through the enamel)
thermoplastic flow (cut-through)
solubility
transformer oil resistance and hydrolitic stability
bond
thermal endurance
scrape resistance of the enamel
loss of mass
electrical resistance
lap shear bond strength
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Efficient enameled copper wire
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