Thin corona resistant Kapton® ECRC film withstands electrical stresses of SiC/GaN inverters of 800V e-mobility platforms

Product Description

Kapton® 110ECRC074 is a thin corona resistant polyimide film with a single sided fluoropolymer coating that is heat fusible to copper and to itself, making it ideal for use in high voltage electrical insulation applications where lifetime and reliability are desired.

This film enables more flexibility in insulation constructions to achieve increased power density in compact lighter weight electrical motor designs. When used as a magnet wire insulation, Kapton® 110ECRC074 offers longer lifetime under high electrical stresses and reduces thermal resistance relative to standard magnet wire insulations.

The corona resistant films have been developed to withstand the damaging effects of higher switching frequency (dv/dt) inverters that can accelerate the aging of an insulation material or system. This partial discharge (PD) resistant film offers a superior balance of physical, electrical and thermal properties.

Applications:

Magnet wire insulation in the following:

  • Automotive e-motors
  • Traction motors
  • Industrial motors
  • Hydro and wind power generators
  • Motors for high dv/dt inverters

Study of the Effects of Silicon Carbide (SiC) Inverters on Electric Motor Insulation

Swedish Energy Agency funded the research led by ABB to determine the effect Silicon Carbide technology will place on future motor design electrical insulation system. 

ABB technical group designed and led the experiment, AB Dahrentrad produced top quality polyimide tape wrapped wire, and DuPont supplied Kapton® film candidates for comparison in the study. University of Chalmers performed the accelerated aging dv/dt testing at two voltage levels and two temperatures for determination of average life at failure. 

 
 
 
Research Study participants

 

Wire Insulations: DuPont™ Kapton® ECRC and Kapton® FN polyimide films

Voltage Endurance Test Conditions: 3 and 3.5 kV Voltage Amplitudes; 150 and 180 °C Temperatures

Benefits of the Thin Kapton® ECRC Film

In the above study, the thin (28 µm) corona resistant Kapton® ECRC film provided 8X longer life relative to standard Kapton® FN film even when the insulation build was 25% thinner.

This thin insulation material will provide an additional degree of design freedom for those looking to create smaller, powerful and more reliable motors.

View Article: Kapton® Polyimide Film Addresses the Impact of Higher Switching Frequency and Faster Voltage Rise on Motor Insulation

Typical Properties of Kapton® 110ECRC074 Film

Property

Unit

Typical Value

 

Test Method

 

Thickness

mil

µm

1.1

28

ASTM D-374

 

Unit Weight

g/sqm

45.1

MD Tensile Strength

kpsi

MPa

25.3

174

ASTM D-882

MD Modulus

kpsi

MPa

400

2758

ASTM D-882

MD Elongation

%

77

ASTM D-882

Dielectric Strength

V/mil

kV/mm

5100

201

ASTM D-149