Enamelling Machine & Curing Oven

Selection criteria

Number of passes, oven temperature profile, line speed, solvent recovery.

Supply chain

Enamelling lines are built by a small number of European specialists and many Chinese makers serving the large domestic magnet-wire industry. Film build, cure and concentricity are set on this machine, which is why wire from different suppliers winds differently on the same needle winder.

Buyer FAQ

How do I specify enamelled wire properly?

Reference the IEC 60317 product sheet, for example IEC 60317-13 for polyesterimide with polyamide-imide overcoat, class 200, which fixes chemistry and thermal class. Then state the film grade (1, 2 or 3), breakdown voltage, pinhole limits, and adhesion, heat-shock and cut-through tests. Grade 2 is the usual choice for random-wound motors.

How can I tell whether the enamel is correctly cured?

Under-cured enamel is soft and swells or softens in impregnating varnish; over-cured enamel is brittle and cracks when wound or formed. Suppliers check cure with the dielectric dissipation factor (tan δ) versus temperature test, solvent resistance and heat-shock tests. Ask for tan δ results per lot and run a varnish compatibility test with your own resin.

Why does wire from different suppliers wind differently?

Film concentricity, surface lubricant and conductor hardness vary between lines. An eccentric film fails breakdown on its thin side after winding stress, and lubricant level changes friction in needle nozzles and slot insertion. Ask for cross-section concentricity data and friction-coefficient results, and requalify on your own winder before switching suppliers.

Where it is used