Special magnet wires enamels have been developed to resist film degradation due to partial discharges activity in the presence of fast rise-time voltage surges as those ones generated by inverter fed drives. 

Corona resistant wires enamelled with nano-structured polyesterimide and polyamideimide. In particular, lately developed corona resistant polyamideimide Allotherm 602 CR FLAT, suitable for round and flat wires, showed outstanding resistance even when used as topcoat in typical wire base/top ratios.

What are the advantages of Corona Resistant enamel?
1. improves dielectric performance under continuous electrical solicitation.
2. The performance of a Corona Resistant Grade 2 is comparable to a standard Grade 3 wire when the wires are subjected to a constant voltage of 4 kV.
3. A higher life time is also found when the wire is subjected to repetitive voltage pulses, simulating the behavior of an inverter.

This means less coatings, longer life and higher filling factors.

What are the applications of Corona Resistant enamel?
Used in inverter driven traction motors.

Previous：Fiberglass Insulation Materials
Next：Corona-resistant wire enamel compositions and conductors insulated therewith