Stator for E-Motor

Stator for E-Motor

Efficient heat dissipation is a critical element of e-motor designs. The use of potting or impregnating resins can dramatically lower operating temperature, resulting in higher power output, longer motor life and better reliability. Motors potted with highly thermally conductive materials have been proven to achieve better performance than unpotted motors.

Stator Encapsulation and Impregnation

Huntsman offers a wide range of heat-conductive encapsulants for electric motors under the ARALDITE® brand, all of which meet the highest temperature endurance requirements of car manufacturers. ARALDITE® resin solutions deliver superior heat dissipation, and can reduce operating temperature up to 25% compared to standard impregnation technology. This enables designers to choose among several performance improvements: motor size can be reduced by up to 25%, continuous power can be increased by up to 25% or motor cost can be reduced by up to 30%.

Araldite® CW 2731

Glass transition temperature (Tg):
165°C

Thermal conductivity:
3.0 W/(m.K)

Suitable for:

  • Vacuum Casting
  • Atmospheric Casting
  • Automatic Pressure Gelation

1-c epoxy system with deep viscosity drop above 60°C for fast processing. Very high thermal conductivity and endurance. Excellent resistance to atmospheric and chemical degradation.

Araldite® CW 30334 /
Aradur® HW 30335

Glass transition temperature (Tg):
100°C

Thermal conductivity:
1.2 W/(m.K)

Suitable for: 

  • Vacuum Casting
  • Atmospheric Casting
  • Automatic Pressure Gelation

Well balanced properties: good heat conductivity, very good crack resistance, media and thermal resistance. Excellent flow properties allow for fast filling times and good impregnation.

Araldite® CW 30407 /
Aradur® HW 30408 /
Aradur® HW 30409

Glass transition temperature (Tg):
60 - 65°C

Thermal conductivity:
0.8 - 1.1 W/(m.K)

Suitable for:

  • Vacuum Casting
  • Atmospheric Casting
  • Automatic Pressure Gelation

Fast processing and curing comparable to impregnation processes. Excellent flow and gap filling with adaptable viscosity and thermal conductivity. High temperature and crack resistance. Recommended for hairpin windings.

Araldite® CW 30326 /
Aradur® HW 30327

Glass transition temperature (Tg):
115°C

Thermal conductivity:
0.7 W/(m.K)

Suitable for: 

  • Vacuum Casting
  • Atmospheric Casting
  • Automatic Pressure Gelation

Excellent gap filling capability and heat conductivity. Toughened resin with reinforcing fillers for superior crack and thermoshock resistance. Very high thermal and chemical endurance.

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.

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Huntsman is a globally established supplier to the automotive industry, so we can offer local and global supply and support for custom-tailored solutions.

Huntsman has close collaborations with leading equipment suppliers, so our experts can help you quickly set up fast and efficient potting/encapsulation and impregnation processes.

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Frequently Asked Questions

Why is potting or encapsulation of e-motors so important?

It's a common maxim in the motor industry that every ten degrees of reduced operating temperature corresponds with a doubling of engine life. As the electric vehicle industry moves to 800-volt architectures, e-motors will be expected to be able to carry higher currents without overheating. Lowering the operating temperature of electric motors by using potting or encapsulation compounds offers other benefits as well, including higher power output and better reliability.

What are the best materials to use for potting of e-motors?

Tests confirm that motors potted with highly thermally conductive materials such as our range of ARALDITE® resins achieve better performance than unpotted motors. Hot spot temperatures of motors impregnated with high thermal conductivity materials are generally 40 to 45° C cooler than a varnish-only motor, and about 20° C cooler than a motor potted with a standard epoxy.

Sub-optimal potting materials may be subject to cracking. Our new generation of epoxy resin systems enables 100% shock resistance and 100% reduction in the risk of cracks.

How does potting or encapsulation give motor designers more options?

In addition to greatly improving motor longevity, reducing hot spot temperature allows motor designers to increase maximum power/torque for a given motor size, or to decrease motor size for the required power/torque.

What specific benefits do Huntsman's systems offer for stator impregnation?

When e-motor producers use polyester or other material containing volatile organic compounds (VOCs) for stator impregnation, material is lost, resulting in higher material costs. Our epoxy is free of VOCs, which means it exhibits no loss of mass, and also delivers reduced costs for ventilation systems, cleaning and personal protective equipment. Furthermore, our epoxy 1k mono-component resin exhibits better adhesion to PEEK insulation, which improves motor performance and life.

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