Rotor for E-Motor

Rotor for E-Motor

Secondary insulation materials provide several essential benefits in e-motor designs. Impregnation, particularly potting, can greatly lower operating temperature, resulting in higher power output, longer motor life and better reliability. It also helps to reduce mechanical stress, protect windings from contaminants (water, dust, chemicals), and provide an optimal insulation structure.

Reliable Mechanical Fixation at Highest Rotation Speeds

Huntsman offers a wide range of heat-conductive encapsulants for electrified powertrains under our ARALDITE® brand, all of which meet the highest temperature endurance requirements of car manufacturers. Our potting resin supports and strengthens rotor coils under high rotation speeds (>15,000 rpm) and high temperatures. It also offers excellent crack resistance, fast vacuum processing for reliable void-free electrical insulation, noise damping for acoustic benefits, and complete protection against aggressive chemicals.

Araldite® CW 30386 /
Aradur® HW 30387

Glass transition temperature (Tg):
200°C

Thermal conductivity:
0.6 W/(m.K)

Suitable for:

  • Vacuum Casting
  • Atmospheric Casting 
  • Automatic Pressure Gelation

Developed for rotor potting. Very low CTE, highest modulus and strength between -40°C and + 180°C. Very good intra-coil impregnation, high Tg. Outstanding resistance at elevated temperatures and high rotation speed.

Araldite® CY 38500

Glass transition temperature (Tg):
170°C

Thermal conductivity:
0.2 W/(m.K)

Suitable for: 

  • Trickle Impregnation
  • Roll Dip Impregnation

1-c epoxy system for trickle impregnation. Fast cure times and high Tg. Improved wetting and adhesion to primary insulation.

Araldite® CW 30388 /
Aradur® HW 30389

Glass transition temperature (Tg): 
200°C

Thermal conductivity: 
0.95 W/(m.K)

Suitable for: 

  • Vacuum Casting
  • Atmospheric Casting
  • Automatic Pressure Gelation

Highest modulus and strength between -40°C and + 180°C. Very good intra-coil impregnation. Developed for rotor potting with improved heat dissipation.

Araldite® CW 30590 /
Aradur® HW 30327

Glass transition temperature (Tg): 
170°C 

Thermal conductivity:
0.6 W/(m.K)

Suitable for: 

  • Vacuum Casting
  • Atmospheric Casting
  • Automatic Pressure Gelation

Very good impregnation. Developed for rotor potting. Toughened with reinforcing fillers for superior crack and thermal shock resistance.

Araldite® CY 179 /
Aradur® 917-1 /
Accelerator DY 070

Glass transition temperature (Tg)
200°C

Thermal conductivity
0.2 W/(m.K)

Suitable for:

  • Filament winding

High strength and modulus supporting the rotor structure during operation within the entire operation range. Low CTE, outstanding dimensional stability at high loads. Low viscosity and long pot life for versatile processing, e.g. filament winding.

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Huntsman works to make your production as simple and cost-effective as possible at every stage, from material design to production line setup.

Our products are formulated to offer characteristics (viscosity, mix ratio, gel time) that make it easy to optimize and automate production processes. As a globally established automotive supplier, we can offer local and global supply and support for custom-tailored solutions. Huntsman has close relationships with leading equipment suppliers, and our experts work with them to help you develop and implement customer-specific systems for fast, efficient and repeatable processing.

The Right Resin Systems for Your Electronic Components

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Stator for E-Motor

Stator for E-Motor

We offer heat-conductive encapsulants for electric motors, all of which meet the highest temperature endurance requirements of car manufacturers.

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Rotor for E-Motor

Rotor for E-Motor

Our secondary insulation materials guarantee a strong and durable fixing of rotor coils, even when operating under high rotation speeds and challenging peak temperatures.

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Power Electronics

Our encapsulation technology can substantially improve the performance and cost of power electronics devices and is ready for next-generation high-voltage applications.

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Ignition Coil

We produce epoxy systems specially designed to insulate high-voltage coil components, thus reducing transformer and inductor hot spots and extending reliability and lifespan.

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Encapsulants and Impregnation Resins for E-Motor

Encapsulants and Impregnation Resins for E-Motor

Araldite® encapsulants and impregnation resins for e-motor improve heat dissipation and extend lifetime

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Frequently Asked Questions

What are the insulation requirements for the new generation of E-Motors?

As the electric vehicle industry moves to 800-volt architectures, e-motors will be expected to be able to carry higher currents without overheating. Epoxy technology for secondary insulation can meet the challenging new requirements, including improved thermal management, void-free electrical insulation, high crack resistance and superior mechanical performance.

Why use a Huntsman product?

ARALDITE® CW 30386 resin / HW 30387 hardener belongs to a new generation of vacuum casting resins. It offers high glass transition temperature (Tg) and low viscosity. It guarantees strong and durable fixing of rotor coils even when operating under high rotation speeds and challenging peak temperatures. It is fully compatible with new sustainable rotor designs that avoid rare earth permanent magnets.

Why is low viscosity so important?

A low-viscosity resin can thoroughly penetrate even the tightest coil and slot windings, eliminating air gaps and resulting in consistent insulation performance. In almost all situations, applying a potting solution will avoid the need for previous varnishing (VPI), simplifying the manufacturing process and reducing costs.

The Right Solution for Your Manufacturing Process

Discover our electronics processes and decrease your production waste and processing time.

Processes for Electronics

Encapsulation Resin Systems

Our ranges of epoxy and polyurethane encapsulant chemistries meet the most stringent requirements for electronics applications in the electrified powertrain.

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Impregnation Resin Systems

Huntsman’s one- and two-component resin systems for impregnation processes insulate, protect, and improve the efficiency and durability of electric motors.

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