The “heart” of electrical equipment—motors, transformers, and high-voltage systems—relies on high-quality “blood vessels”—insulated electromagnetic wires—for stable and efficient operation. Polyimide (PI) insulated copper wire, due to its excellent high-temperature resistance and high insulation properties, has become the standard for many high-end applications. However, for a long time, wrapped PI copper wire has suffered from many drawbacks due to process limitations, such as weak wear resistance, risk of interface delamination, and low efficiency, which have restricted the energy efficiency and reliability of equipment.
Facing industry bottlenecks, TST Cable has broken through traditional processes and launched a new generation of extruded polyimide insulated flat copper wire through innovative melt extrusion technology. It not only maintains the superior performance of PI material but also achieves a comprehensive leap in structure, efficiency, and reliability, becoming a key breakthrough in the upgrading of electromagnetic wires.
1. Production efficiency + structural revolution: laying the foundation for a leading position.
Traditional wrapping processes require winding and bonding multiple layers of PI film onto the conductor surface. This process relies on manual intervention, is speed-limited, and prone to introducing errors. Extrusion processes, on the other hand, are entirely different:
Integrated molding and molecular-level bonding: After the PI resin is melted at high temperature, it directly coats the conductor, achieving a gapless bond between the insulation layer and the copper conductor, eliminating the risk of micro-gaps and delamination caused by adhesives and air residues in the wrapping process.
Continuous production ensures stable and controllable quality: The fully automated extrusion production line can reach speeds of 10~50m/min, significantly improving production efficiency. Moreover, the production process is not affected by human factors, resulting in a significantly higher yield rate and ensuring consistent large-scale supply.
This means that extruded flat copper wire had a more stable and reliable physical foundation from the very beginning.
2. Eight major performance advantages define a new generation of electromagnetic wire standards
Ultra-thin insulation, power density leap
The insulation layer can be stably made ≤0.08mm, far lower than that of the wrapped type (usually ≥0.20mm). In the same space, the conductor fill rate is increased by 30%-40%, helping the motor to achieve higher power, lower loss and temperature rise, making it an ideal choice for 800V high-voltage platforms.
High voltage and corona resistance, fearless of high voltage challenges
Its dense, gapless structure increases its breakdown voltage by 15%-25%. Nanotechnology further enhances its corona resistance life to over 1000 hours (compared to <500 hours for wrapped types), and its corona initiation voltage (PDIV) to over 1500V, ensuring long-term safe operation under high frequency and high voltage conditions.
Excellent mechanical performance, adaptable to harsh working conditions
With a tensile strength exceeding 350 MPa, it far surpasses the wrapped type (approximately 200 MPa). The insulation layer does not crack when subjected to 25% tensile deformation, and the bending radius can be as small as 3 times the conductor size, perfectly adapting to the needs of high-frequency vibration and compact design.
Wide temperature range adaptability, easily cope with extreme conditions
With an operating temperature range of -269℃ to 380℃, it can withstand both the deep cold environment of aerospace and the continuous operation of high-temperature motors, making it far more suitable than the wrapped type (-250℃ to 260℃).
Dense and tough surface, strong environmental resistance
The high-density insulation layer has a smooth surface, improving scratch and impact resistance by 30%-50%. Its excellent resistance to chemical media extends its lifespan by approximately 20% in harsh environments such as oil, acids, and alkalis.
Clean and environmentally friendly, meeting special requirements
The material is simple and pure, with no volatile substances, making it suitable for applications with extremely high cleanliness requirements, such as semiconductor manufacturing and spacecraft vacuum chambers. It solves the problem of potential contamination caused by the adhesive layer in wrap-around applications.
High frequency stability and low loss
The uniform and dense insulation structure, combined with low dielectric loss characteristics (tanδ < 0.02%), can effectively reduce dielectric loss and heat generation at high frequencies, ensuring performance stability in high-frequency frequency conversion or high-frequency signal transmission.
Superior insulation adhesion
The insulation layer formed under high pressure has an extremely strong bond with the conductor. Even after severe torsion or bending, it can still maintain the integrity of the insulation and eliminate the risk of insulation failure due to deformation.
3. Focusing on four high-end scenarios, demonstrating its irreplaceable strength.
New Energy Vehicles | The Powerful Heart of the 800V Electric Drive System
In response to the trend of 800V high-voltage fast charging, extruded PI copper flat wire maintains low partial discharge and low dielectric loss at higher voltages, making it an ideal choice for high-voltage drive motor insulation systems and significantly improving range and system reliability.
Aerospace | Survival Experts in Extreme Environments
Adaptable to harsh conditions such as liquid helium cryogenics, strong radiation, and severe vibration, its wide temperature range, radiation resistance, and high mechanical strength make it a key material for aerospace motors, special transformers, and cryogenic equipment.
Industrial frequency converters and high-speed rail traction | The “durability trump card” under high-frequency vibration
In high-frequency environments driven by high-speed IGBTs, it exhibits outstanding corona resistance and anti-aging performance, making it suitable for high power density and high vibration scenarios such as traction motors and frequency converters, thereby reducing equipment operation and maintenance costs.
Specialty Transformers | Reliable Guardians in Extreme Environments
In harsh environments such as shipboard, high-altitude, and chemical environments, extruded PI insulated wires can achieve higher insulation safety margins and structural strength, ensuring the stable operation of special transformers.
4. Long-term economic benefits: Although the investment is slightly higher, the returns are more significant.
Lower overall cost: Although the initial purchase cost of extrusion type is 20% to 30% higher than that of wrapping type, the overall cost is significantly reduced throughout the entire service life due to its longer service life and near-zero maintenance requirements, making it a truly cost-effective choice.
Green manufacturing, energy saving and environmental protection: The extrusion process enables continuous low-energy production with no waste gas or waste emissions, which aligns with sustainable development goals and meets increasingly stringent global environmental regulations.
As electrical systems increasingly move towards higher voltage, higher power density, and higher frequency, the performance bottlenecks of wrapped PI copper wires are becoming more and more prominent. Extruded polyimide insulated flat copper wires, with their integral molding and dense, gapless structure, not only achieve comprehensive performance improvements but also provide reliable material support for the upgrading of industries such as new energy vehicles, aerospace, and special industrial equipment.
Unleashing the potential of materials through innovative processes and driving electrical evolution through structural innovation—this is not only a technological breakthrough for TST cable , but also a clear response to the future direction of electrical development.
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