Is polyester-insulated lead wire resistant to high temperatures and aging?
Publish Time: 2025-10-28
In modern household appliances and industrial equipment, motors are core power components, and their operational stability is directly related to the lifespan and safety of the entire device. This is particularly true in fully enclosed refrigeration compressors, where motors are subjected to high temperatures, high pressures, and a sealed environment filled with refrigeration oil and refrigerant. This places extremely stringent demands on the insulation performance of the internal winding wires. The wires must not only withstand continuous current loads but also maintain insulation integrity under the multiple forces of thermal cycling, chemical corrosion, and mechanical vibration. In this context, the resistance of polyester-insulated lead wire to high temperatures and aging becomes a critical factor in determining the long-term reliable operation of the motor.The fundamental reason why polyester-insulated lead wire is suitable for such demanding applications lies in the scientific design of its composite insulation structure and the thermal stability of the material itself. This wire uses high-purity soft round copper wire as its conductor, wrapped with multiple layers of polyester fiber braid and polyester film to form a double or even multiple protective barrier. Polyester is a high-performance polymer with excellent heat resistance and chemical inertness. Within the rated temperature range, its molecular structure is stable, making it resistant to thermal decomposition, softening, or embrittlement, and capable of withstanding the long-term heat accumulation generated by motor operation.Inside a refrigeration compressor, the current surge during motor startup causes a transient temperature rise, which continues during continuous operation. Furthermore, the limited heat dissipation from the outer casing causes the internal ambient temperature to be significantly higher than the external ambient temperature. Ordinary insulation materials are susceptible to aging phenomena such as discoloration, cracking, and powdering under long-term thermal stress, resulting in a decrease in insulation performance and ultimately causing inter-turn short circuits or ground breakdown. Polyester insulated lead wire, however, offers a heat resistance rating that meets long-term operating temperature requirements. It maintains structural integrity during repeated thermal expansion and contraction, preventing the insulation layer from cracking or peeling, effectively isolating the potential difference between adjacent coils and ensuring safe winding operation.More importantly, polyester material is not only heat-resistant but also exhibits excellent resistance to oils and solvents. The interior of a compressor is filled with refrigeration oil, and refrigerants such as Freon and new environmentally friendly refrigerants are also chemically reactive. Many ordinary insulation materials will swell, blister, or lose strength after prolonged immersion in or contact with these media. Polyester fiber and polyester film offer excellent resistance to common refrigeration oils and refrigerants, preventing loss of insulation due to media corrosion, ensuring long-term, stable service in a fully sealed environment.The braiding and wrapping process further enhances durability. The polyester fiber braid not only provides mechanical protection, preventing scratches on the insulation during winding, but also offers excellent air permeability and elasticity, accommodating minute movements of the windings during thermal expansion and contraction, preventing localized damage caused by stress concentration. The tightly wound outer layer of polyester film forms a continuous, uniform insulation barrier, effectively preventing moisture, oil, and impurities from penetrating the conductor surface, enhancing overall insulation reliability.In practical applications, this high-temperature resistance and resistance to aging directly translates into long motor life and high reliability. Compressors require less frequent maintenance or winding replacement, reducing failure rates and after-sales costs. Especially in household appliances like refrigerators and air conditioners, where motor failure often renders the entire unit useless, selecting high-quality insulated wire is essential for maintaining product reputation and ensuring user trust.Furthermore, polyester-insulated lead wire offers excellent flexibility and windability, facilitating precision winding in confined spaces and adapting to complex coil structures. Even after repeated bending, the insulation layer remains intact, preventing microcracks or delamination, ensuring that every turn of the coil is effectively protected.In summary, polyester-insulated lead wire, thanks to its inherent thermal stability, the multiple protections of its composite structure, and its excellent adaptability to refrigeration environments, truly achieves its high-temperature resistance and anti-aging performance goals. It not only serves as an electrical conductor but also safeguards the safe operation of motors. In the enclosed, high-temperature, and chemically complex compressor environment, it silently supports the long-term and stable operation of modern refrigeration equipment.
