In which industries are Polyimide Film For Motor Coil Winding

         Polyimide Film For Motor Coil Winding is a premium high-temperature electrical insulation material for motor coil winding. With long-term thermal resistance at 220°C, excellent dielectric strength, partial discharge resistance and chemical stability, it is widely adopted as slot liner, turn-to-turn insulation and phase insulation for stators and rotors. It is mainly deployed in industries with high temperature, high voltage, high-frequency pulse and heavy vibration operating environments.

1.Rail Transit Industry

        Rail transit is one of the largest application markets for polyimide winding insulation film. It covers locomotive traction motors, high-speed train traction motors, metro and light rail drive motors. Traction motors face frequent load fluctuation, strong vibration and high peak temperature during operation. Polyimide film maintains stable insulation performance under frequent start-stop and overload conditions, often compounded with aramid paper to build H-class insulation systems for vehicle traction coils.

2.New Energy Automotive Industry

        Polyimide film is heavily used for drive motor coil insulation in electric vehicles and commercial new-energy vehicles. EV traction motors work under high DC voltage and high-frequency inverter pulses, which easily trigger partial discharge. Thin polyimide film helps increase slot filling rate and improve motor power density. It is widely applied in hairpin flat wire motors, serving as coil layer insulation and ground insulation for vehicle drive motors.

3.Wind & Hydropower Power Generation Industry

        Wind turbine generators and large hydroelectric generators adopt polyimide film for stator coil winding insulation. Wind generators require service life over 20 years and endure variable load, humidity and inverter-induced partial discharge. PI film’s outstanding voltage endurance ensures long-term reliability for onshore and offshore wind generators. It is also used for auxiliary high-temperature motors inside power stations.

4.Aerospace & Aviation Industry

        Aerospace electric machines, aircraft starter-generators and actuator motors rely on polyimide film for coil insulation. Aerospace equipment needs materials that tolerate extreme temperature swings, low pressure, fuel and hydraulic fluid corrosion. Polyimide film can withstand temperature from cryogenic condition up to transient high temperature, meeting strict lightweight and high-reliability requirements for airborne motor windings.

5.Oil & Gas Downhole Industry

       Submersible ESP motors for oil extraction are typical heavy-duty applications of polyimide winding film. Downhole motors run in high-temperature well fluid, with oil, brine and chemical corrosion. Polyimide film resists hydrocarbon and solvent erosion while sustaining high voltage in narrow well space, making it the primary insulation choice for downhole electric submersible pump motor coils.

6.Mining & Heavy Industrial Equipment

       Underground mining drive motors, steel rolling motors and metallurgical high-temperature motors use polyimide film for coil insulation. Mining motors face dust, impact vibration and continuous heavy load; metallurgy and steel mill motors work in ambient high temperature. PI insulation prevents insulation breakdown caused by thermal aging and mechanical wear.

7.Nuclear Power & Special High-Reliability Equipment

       Nuclear reactor auxiliary motors and radiation-resistant special motors select polyimide film for coil winding insulation. It keeps stable dielectric performance under radiation and long-time high-temperature operation, suitable for safety-critical power equipment inside nuclear power plants.