Kapton® for Improved Motor & Generator Performance

Kapton® CR and Kapton® FCR polyimide films for improved motor and generator performance

The unique properties of Kapton® allow it to be used extensively in the motor and magnet wire industry. In very thin sections, Kapton® conserves space for conductors, which ultimately yields more power and efficiency without increasing motor size.

The European rail industry adopted Kapton® FCR to improve the efficiency and durability of AC traction motors on its high speed locomotives, where it significantly outperformed traditional insulation systems.

Applications

  • Traction motors
  • Large industrial motors
  • Generators
  • Transformers

Benefits

  • Provides increased durability and longer life
  • Allows use of thinner insulation where space is at a premium
  • Withstands continuous exposure to extreme temperatures
  • Capable of forming strong bonds to magnet wire
  • Delivers superior corona resistance under harsh conditions

General Overview

The unique properties of Kapton® allow it to be used extensively in the motor and magnet wire industry. In very thin sections, Kapton® conserves space for conductors, which ultimately yields more power and efficiency without increasing motor size.

Kapton® provides exceptional overload protection and long motor life, even in the most demanding applications and environments. Kapton® has superior chemical resistance to most solvents, hydrocarbons and lubricants. It also carries the UL 94-VO flammability rating.

Typical motor applications include magnet wire, turn-toturn strand, coil, slot liner and ground insulation. 

Kapton® CR is routinely used in laminate form with other insulating materials like DuPont™ Nomex® electrical insulation and mica insulation.

Types of Kapton® film

DuPont offers a variety of Kapton® films in addition to Kapton® CR and Kapton® FCR for use in motors, generators and transformers to address industry needs such as very high temperature, corona resistance and thermal managment.

Non-heat sealable films: Kapton® CR

Kapton® CR is designed to specifically withstand the damaging effect of partial discharge (corona), which can cause the eventual breakdown of an insulation material or system.

Kapton® CR has very high corona resistance and voltage endurance capabilities as well as high thermal conductivity that allows for better dissipation of heat in motors and other electrical equipment.

Heat-sealable films: Kapton® FCR

Heat-sealable Kapton® films are used as primary insulation on magnet wire. These films are coated with or laminated to DuPont™ Teflon® FEP fluropolymer which acts as a high temperature adhesive. The film is applied in tape form by helically wrapping it over and heat-sealing it to the conductor and to itself.

DuPont™ Kapton® FCR is a proven and extremely reliable wire insulation for demanding applications that withstands corona discharge, while delivering long term performance. Motors and generators insulated with Kapton® FCR enable improved service life and operational efficiency versus conventional insulation. Kapton® FCR handles many of the factors that lead to early failure, such as thermal upsets and partial discharge.

As energy costs increase, improved motor insulation efficiency can provide a direct payoff to the motor or generator operator. The cost of an early failure can far outweigh the cost of using Kapton® FCR.