Impregnation of copper windings and coils provides secondary insulation, increases mechanical stability, improves heat dissipation, and adds protection from humidity, dirt and chemicals. Typical automotive applications are electric motor rotors and stators. Impregnation can vastly improve the efficiency and durability of the motor.
Typically, stator or rotor wires are first coated with a layer of varnish to provide primary insulation. After winding, impregnating resin fills all voids within the windings, and between the windings and laminations. Huntsman offers low-viscosity, high-thermal-class resins that are optimized for the most common impregnation processes used for automotive parts, including both one-component and two-component solutions for trickle and roll-dip impregnation.
Glass transition temperature (Tg):
150°C
Thermal conductivity:
0.2 W/(m.K)
Suitable for:
2-c epoxy system for trickle impregnation and shelf life of many years. Fast cure times at low temperatures. High toughness and good adhesion.
Discover our ARALDITE® encapsulants for electric motors, battery and power electronics.
Impregnation of rotors and stators improves heat transfer, which translates to higher motor efficiency. It also reduces the likelihood of motor failure in several ways. The resin increases the stiffness of the windings, reducing coil vibration and the corresponding risk of abrasion. The void-free insulation increases electrical performance, minimizing the risk of partial discharges.
Huntsman’s one- and two-component resin solutions for impregnation processes exhibit low and stable viscosity, high thermal class, high dielectric strength, and high resistance to humidity and chemicals.
Huntsman’s automotive products have been developed over many years of leadership in the global electrical insulation sector, mainly for high-voltage applications. We continuously study and update our materials in order to deliver the shortest possible curing cycles and meet the most challenging productivity targets.
Huntsman’s process simulation is used to help design a production process tailored to each specific part. New resin selection, flow patterns, injection concepts, curing time and temperature can be modeled at the computer, and high-speed refinements identify any necessary improvements.
