NMN insulation paper, as a traditional and mature insulation solution, offers balanced and stable overall performance. In most mid- to high-end NEV power system applications, it is widely recognized as the “gold standard.” It not only has a long track record of practical application but also enjoys broad market recognition within the industry.
AMA insulation paper, on the other hand, is a more advanced insulation material specifically designed for high-performance motor applications. Compared with NMN, it demonstrates superior performance in three core areas: corona resistance, high-temperature mechanical strength, and service life. It is particularly suited for advanced electric drive systems that demand extreme power density, high rotational speeds, and long operational life, and can be considered an upgraded version of NMN insulation paper.
NEV power systems—especially drive motors—operate under complex conditions, imposing very high demands on insulation materials. These requirements are mainly reflected in four aspects:
High-frequency, high-voltage tolerance: PWM pulse voltages from inverters contain high-voltage spikes and very high-frequency components (dv/dt). Insulation materials must have strong corona resistance to withstand these voltage stresses.
High-temperature stability: As motors evolve toward higher power density, internal operating temperatures continuously rise. Insulation materials must maintain stable performance under prolonged high-temperature conditions without aging or failure.
Thermal cycling resistance: Frequent vehicle start-stop and acceleration cause rapid motor temperature fluctuations. Insulation materials must exhibit excellent resistance to thermal shock to prevent fatigue or delamination caused by repeated temperature cycles.
Mechanical toughness adaptation: Vehicle operation involves continuous vibration. Insulation materials must possess good mechanical toughness to avoid damage during vibration and ensure reliable insulation performance.
The stator of the drive motor is the key application area for both AMA and NMN insulation papers, primarily used for slot insulation, phase-to-phase insulation, and end-turn insulation. The typical usage scenarios and selection logic for each material are as follows:
Applicable vehicles/motors: Conventional or mid-range vehicle drive motors with non-extreme performance requirements.
Core selection consideration: Projects where cost control is the primary goal, aiming to minimize procurement and application costs while meeting basic insulation requirements.
Supply chain and design adaptation: Leverages existing mature designs and stable supply chains, avoiding process changes due to material replacement, thereby reducing technical risks and production fluctuations.
Conclusion: NMN insulation paper remains a reliable and economical choice, capable of meeting insulation needs in most conventional NEV power system applications.
High-performance scenarios: Drive motors in high-end vehicles or high-performance motors requiring higher power density and peak power.
High-speed operation: Motors with rotational speeds exceeding 16,000 rpm (or even 20,000 rpm)—higher speeds correspond to higher inverter switching frequencies, imposing stricter corona resistance requirements on the insulation material.
High-voltage platform adaptation: For 800V and above high-voltage power systems, where increased system voltage demands insulation materials with stronger corona resistance and higher dielectric strength.
Long life and high reliability requirements: Vehicles designed to reduce warranty costs or commercial operation vehicles (e.g., taxis, heavy trucks) require insulation materials that enable the motor to achieve ultra-long service life and extremely high reliability.
Conclusion: AMA insulation paper, with its all-aramid structure and superior performance, significantly enhances motor reliability and service life under extreme conditions, making it the optimal choice for future high-performance electric drive systems.
Beyond drive motor stators, AMA and NMN insulation papers are also used in other components of NEV power systems, as follows:
On-Board Chargers (OBC) and DC-DC Converters: Core components such as transformers and inductors in these devices also require high-performance insulation materials. For products with high power ratings and stringent thermal management requirements, AMA insulation paper retains its advantages in temperature resistance and corona resistance, ensuring long-term stable operation of the components.
Battery Packs: Insulation is occasionally needed for high-voltage connections, which is not the main application scenario for insulation materials. Both AMA and NMN can meet the basic insulation requirements here and they have no significant difference in performance.
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