Potting & Encapsulation

Protecting Magnetic Components in Demanding Applications

Potting and encapsulation can provide additional protection for transformers operating in demanding environments.

Depending on the application, an encapsulated transformer may require improved:

• Electrical insulation
• Moisture resistance
• Mechanical stability
• Environmental protection
• Acoustic performance
• Thermal transfer

HY MFG evaluates the encapsulation process according to the electrical and environmental requirements of the product.

Why Pot a Transformer?

Potting may be used to address specific application requirements such as:

Electrical Insulation

Encapsulation can provide an additional insulating barrier around the magnetic assembly.

Environmental Protection

The encapsulation material can help protect internal components from:

• Moisture
• Dust
• Contaminants
• Mechanical exposure

Mechanical Stability

Potting can help secure internal components and reduce movement or vibration.

Acoustic Performance

For certain transformer constructions, encapsulation can help reduce mechanical vibration and associated acoustic noise.

Encapsulation Materials

Material selection depends on the application.

Common approaches may include:

• Epoxy
• Polyurethane
• Silicone-based materials

The selection considers:

• Operating temperature
• Electrical insulation requirements
• Thermal conductivity
• Mechanical properties
• Chemical/environmental exposure
• Cure characteristics

The material should be selected as part of the overall transformer design rather than independently from it.

Potting Process

A typical encapsulation process includes:

Transformer Assembly

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Pre-Inspection

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Material Preparation

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Vacuum / Controlled Potting

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Curing

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Final Inspection

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Electrical Testing

Process parameters are controlled according to the approved product specification.

Thermal Considerations

Encapsulation can change the thermal behavior of a transformer.

While some materials can improve heat transfer from the winding and core, the final thermal performance depends on:

• Material properties
• Potting thickness
• Transformer loss
• Enclosure
• Ambient conditions
• Heat dissipation path

For this reason, potting should be evaluated together with the transformer thermal design.

Custom Encapsulation

HY MFG can support project-specific requirements involving:

• Potting material
• Potting geometry
• Partial encapsulation
• Full encapsulation
• Custom housing
• Lead exits
• Mounting interfaces

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