Application of NHN Insulation Paper in New Energy Vehicle Drive Motors

With the rapid development of the global new energy vehicle industry, higher requirements are being placed on the performance of electric vehicle drive motors. As the core component of the electric power system, drive motors are developing toward higher power density, higher efficiency, higher speed, higher voltage platforms, and lightweight design. Under these trends, the insulation system inside motors faces increasing challenges in terms of thermal resistance, electrical performance, and mechanical strength.

NHN insulation paper (6650 NHN), as a high-performance Class H (180°C) composite insulation material, has become an important material in new energy vehicle drive motor insulation systems due to its excellent heat resistance, electrical insulation properties, mechanical strength, and corona resistance. It provides reliable protection for the long-term stable operation of electric motors.

1. Introduction to NHN Insulation Paper

NHN insulation paper is a high-performance composite insulation material consisting of three layers: Nomex aramid paper + Polyimide film + Nomex aramid paper.

Structure:

Nomex Aramid Paper / Polyimide Film / Nomex Aramid Paper

The functions of each layer include:

• Nomex aramid paper layer: Provides excellent mechanical strength, tear resistance, and thermal aging resistance.
• Polyimide film layer: Provides high dielectric strength, excellent high-temperature resistance, and superior corona resistance.

Through the combination of these three materials, NHN insulation paper can meet the insulation requirements of new energy vehicle drive motors operating under high temperature, high voltage, and high-frequency conditions.

NHN is typically classified as a Class H (180°C) electrical insulation material and is widely used in high-performance motors, generators, and new energy vehicle drive systems.

2. High Requirements for Insulation Materials in New Energy Vehicle Drive Motors

High-temperature Operating Requirements

New energy vehicle drive motors generate significant heat under high-speed and high-load operating conditions, resulting in continuous temperature increases inside the motor.

Insulation materials must provide:

• Excellent thermal aging resistance;
• Long-term high-temperature stability;
• Strong thermal shock resistance.

With its Class H 180°C temperature rating, NHN insulation paper effectively improves the reliability and service life of motor insulation systems.

High-voltage Insulation Requirements

With the development of 800V high-voltage platforms for electric vehicles, drive motors are required to withstand higher electrical stress.

NHN insulation paper features:

• High dielectric strength;
• Excellent insulation stability;
• Good resistance to partial discharge.

It effectively reduces the risk of insulation breakdown during motor operation.

Mechanical Strength Requirements for High-speed Operation

As the speed of new energy vehicle drive motors continues to increase, internal insulation materials are exposed to greater mechanical vibration and stress.

NHN insulation paper provides:

• High tensile strength;
• Excellent wear resistance;
• Good dimensional stability.

It can withstand long-term operation in high-speed motor environments.

3. Main Applications of NHN Insulation Paper in New Energy Vehicle Drive Motors

Stator Slot Insulation

Slot insulation is one of the most important applications of NHN insulation paper in new energy vehicle drive motors.

Between the stator core and copper windings, insulation materials are required to prevent direct contact and avoid short circuits.

NHN insulation paper used as slot insulation can:

• Provide reliable electrical isolation;
• Withstand mechanical pressure during winding installation;
• Extend the overall insulation life of the motor.

Phase Insulation

New energy vehicle drive motors usually adopt three-phase AC structures, where voltage differences exist between different phase windings.

NHN insulation paper can be used for:

• Three-phase winding isolation;
• Preventing phase-to-phase breakdown;
• Improving motor operating safety.

It is especially suitable for high-power and high-voltage electric vehicle motor systems.

Turn-to-Turn Insulation

New energy vehicle motors are generally powered by inverters, where high-frequency PWM voltage can generate significant electrical stress.

The polyimide film layer in NHN provides excellent voltage resistance and corona resistance, improving the reliability of winding turn-to-turn insulation.

End Winding Insulation

The end winding area of motors is easily affected by:

• High temperature;
• Vibration;
• Electric field concentration.

NHN insulation paper features excellent flexibility and processing performance, making it suitable for end winding insulation protection and improving overall motor reliability.

4. NHN Insulation Paper Supports the Development of High-performance EV Motors

With the continuous growth of the new energy vehicle market, drive motors are developing toward higher efficiency and higher power density. Future trends such as 800V high-voltage platforms, high-speed motors, and intelligent electric drive systems will further increase the demand for high-performance insulation materials.

With its:

• Class H 180°C heat resistance
• Excellent electrical insulation performance
• Outstanding mechanical strength
• Superior corona resistance

NHN insulation paper will play an increasingly important role in new energy vehicle drive motor applications.

As a professional electrical insulation material manufacturer, Ztelec Group continuously develops and manufactures high-performance insulation materials, including NHN, NMN, DMD composite insulation materials, polyimide films, and epoxy fiberglass laminated sheets, providing reliable insulation solutions for new energy vehicles, motors, transformers, and electrical equipment.