New AIW 220 °C Line Added: Expanding High-Temperature Magnet Wire Capacity

We have brought additional polyamide-imide — AIW, 220 °C — enamelling capacity online. The new line is dedicated to high-temperature builds and is aimed squarely at the demand growth we are seeing from inverter-duty motors, EV traction and high-efficiency compressor applications.

This note sets out what changed, which specifications benefit, and what buyers of high-temperature magnet wire should expect as a result.

What Has Changed

The important change is not only volume. Because the line is dedicated to high-temperature builds, AIW orders no longer queue behind standard 130 – 180 °C production. That removes the least predictable element from the schedule for buyers of high-temperature wire.

Why 220 °C Demand Is Growing

Polyamide-imide over polyester or polyester-imide base coats — the AIW construction — is the established answer when a winding must survive higher continuous temperatures or short-term thermal excursions. Three application trends are driving volume:

• Inverter duty. Variable-frequency drives expose windings to fast voltage transitions and elevated local heating. Higher thermal-class insulation gives the design margin needed to keep a class B or F rating in practice.
• EV and hybrid traction. Traction motors run hot, and the push toward higher power density and higher DC bus voltages leaves less thermal headroom everywhere in the winding.
• High-efficiency compressors and industrial motors. Efficiency regulations have pushed designers toward more copper, tighter magnetic circuits and hotter running points — all of which raise the winding temperature for a given frame size.

The other driver is corona resistance. Where the application combines high temperature with inverter waveforms, a high-temperature build is often specified together with a corona-resistant construction. We supply both, and can advise on which the application actually needs.

Specifications Covered

The expanded capacity covers the following high-temperature constructions:

Conductor options on the new line are copper and copper-clad aluminium, in round section. Aluminium is available on the standard lines for applications where weight or cost dominates.

What This Means for Lead Times

Buyers of high-temperature wire should see improvement in two places:

• Sample response — a sample of a standard AIW specification can be scheduled without waiting for a gap in another grade's production.
• Production scheduling — AIW orders are planned on dedicated capacity, so the delivery date no longer depends on how congested the standard-grade lines are in a given month.

As always, the lead time quoted on a specific order still depends on the conductor diameter, the colour, the enamel build and the volume. A non-standard diameter or a special colour will extend the schedule regardless of line availability, because those introduce a separate setup.

Quality Controls on the New Line

The new capacity operates under the same quality system and test regime as our existing lines:

• Incoming conductor inspection — diameter, surface condition, conductivity.
• In-process monitoring of enamel build, oven temperature profile and line speed.
• Routine finished-wire testing — conductor diameter, insulation thickness, elongation, breakdown voltage, adhesion, and flexibility by mandrel and elongation.
• Thermal class verification by the applicable IEC 60317 / NEMA MW 1000 method.
• Certification to ISO 9001 and ISO 14001, with RoHS and REACH declarations issued per shipment.

Test reports reference the production batch, so a high-temperature specification ordered today is traceable in the same way as a standard build ordered last year.