Electric Motor Insulation: A Guide to Special Insulation Materials

Electric motor insulation plays a crucial role in ensuring the efficient and safe operation of electric motors. Insulation materials are used to protect the motor windings from electrical and thermal stresses. In this guide, we will explore some special insulation materials commonly used in electric motor insulation.

First, let’s understand what insulation materials are?

Insulation materials are substances used in electrical equipment and electronic devices to prevent the loss or interference of electric current. They possess high electrical resistance properties, enabling effective isolation of electrical conductors and components. These materials act as barriers, preventing the flow of electric current and minimizing the risk of short circuits or electrical leakage. Insulation materials play a crucial role in ensuring the safety and functionality of electrical systems by providing protection against electrical shocks and reducing the possibility of damage or malfunction. They are designed to withstand various environmental conditions, temperature fluctuations, and voltage levels, ensuring reliable and efficient operation of electrical equipment.

The role and application of insulation materials in motors

NHN 6650:

NHN 6650 NOMEX mylar paper is a kind of three-layer composite material made of NOMEX paper that adhered to polyimide film on its both sides.NHN 6650 is commonly used as slot insulation and interlayer insulation in electric motors. It provides excellent electrical insulation properties and high thermal resistance, ensuring the safety and durability of the motor windings.

Diphenyl Ether Laminated Glass Fiber Sheet:

Diphenyl ether laminated glass cloth board is a plate-like laminate made of electroless alkali-free glass fiber cloth impregnated with phenol-modified diphenyl ether resin by baking and hot pressing, which has high mechanical and dielectric properties and is resistant to radiation. This material is often used as slot liners and phase insulation in electric motors. It offers outstanding electrical insulation properties and high mechanical strength, protecting the windings from electrical and mechanical stresses.

SMC SHEET:

SMC (Sheet Molding Compound) is widely used in electric motors for its high dielectric strength and dimensional stability. It is utilized as slot insulation, coil insulation, and stator core insulation, ensuring efficient motor performance and protection against electrical breakdown.

Fish Paper Insulation:

FISH PAPER 6520 is commonly used as slot insulation and phase insulation in electric motors. It provides excellent electrical insulation properties and mechanical strength, safeguarding the windings from electrical shorts and mechanical damage.

NMN 6640 NOMEX mylar paper:

NMN 6640 is used as slot insulation, interlayer insulation, and phase insulation in electric motors. It offers excellent electrical insulation properties and high thermal endurance, ensuring reliable motor performance even under high-temperature conditions.

PET FILM:

PET (Polyethylene Terephthalate) film is commonly used as slot liners, phase insulation, and wrapping material in electric motor windings. It provides good electrical insulation properties and high mechanical strength, protecting the windings from electrical breakdown and mechanical stresses.

DMD:

Electrical insulation paper DMD prepreg is made of DMD coated with F-class modified epoxy resin in semi-solidified state by heating.DMD (Dacron Mylar Dacron) is often used as slot liner insulation, coil wrapping, and interlayer insulation in electric motors. It offers excellent electrical insulation properties, high mechanical strength, and good thermal resistance, ensuring reliable motor operation and protection against electrical shorts.

Bismaleimide Laminated Glass Fiber Sheet:

This material is used in electric motors where extreme temperature and chemical resistance are required. It is commonly used as slot liners and phase insulation, providing excellent electrical insulation properties and high mechanical strength, even in harsh operating conditions.

Unidirectional binding tape:

Unidirectional binding tape is a high-strength reinforcement material used in electric motor insulation. It is applied to the windings for additional mechanical strength and stability, ensuring reliable motor performance and preventing damage during operation.

SMC Accessories:

SMC (Sheet Molding Compound) is widely used as slot insulation, coil insulation, and stator core insulation in electric motors. It offers excellent electrical insulation properties, high mechanical strength, and resistance to moisture and chemicals, ensuring efficient motor operation and protection against electrical breakdown.

Conclusion:

Choosing the right insulation material is crucial for the efficient and safe operation of electric motors. The special insulation materials mentioned in this guide offer excellent electrical insulation properties, high thermal resistance, and good mechanical strength. By understanding the characteristics and applications of these materials, engineers and designers can make informed decisions in selecting the most suitable insulation material for electric motor applications.