Compared to electromagnetic wire and silicon steel sheets, lead wires are used in relatively less in a motor , but they play a crucial role in the quality of a motor.
Lead wires are the only and critical components in motor products that are directly connected to the windings and provide wiring for customers. During the design phase, appropriate lead wires should be selected according to the motor's current, rated voltage, corresponding operating conditions, and the manufacturing process.
In many motor manufacturing processes, motor leads are impregnated with varnish along with the windings. Therefore, in addition to electrical strength and heat resistance, a very important property is impregnation resistance. For leads that do not meet the requirements for impregnation resistance, the insulation layer will crack and break after the windings are impregnated and dried, which will seriously affect the quality and performance of the motor.
To avoid such problems, lead manufacturers should strictly adhere to product inspection and control standards to ensure that all performance characteristics of lead products meet the requirements, thereby satisfying the quality control requirements under different winding manufacturing processes.
Features of Irradiated Cross-linked Low Smoke Halogen-Free Flame Retardant and Fire-Resistant Wires and Cables
Irradiation cross-linked low-smoke halogen-free flame-retardant and fire-resistant wires and cables utilize imported low-smoke halogen-free materials and employ a high-energy electron beam generated by an electron accelerator to irradiate and cross-link the cable. This transforms the cable's insulation layer from a linear molecular structure into a three-dimensional network structure, forming a three-dimensional lattice smaller than water molecules. This creates a dense layer on and inside the polyethylene surface, effectively preventing the combination of hydroxides and water molecules. This cross-linking method not only improves the temperature resistance, abrasion resistance, and flame retardancy of the wires and cables but, more importantly, also provides water resistance.
This cross-linking method is neither high-temperature nor water-intensive, enabling the polyethylene to cross-link while simultaneously improving the cable's flame retardancy and electrical properties. This results in cables with low smoke, halogen-free, flame-retardant, fire-resistant, and high-temperature resistant characteristics. Specific performance features include: high temperature resistance (conductor's long-term allowable operating temperature is 135℃); good flame retardancy (bundled burning test is Class A); no smoke or toxic gases; light transmittance ≥90%; pH value ≥6.0; excellent mechanical properties; abrasion resistance up to 160,000 cycles; and a service life exceeding 50 years.
Applications include irradiated cross-linked low-smoke halogen-free flame-retardant and fire-resistant wires and cables suitable for 10kV and below power transmission and distribution systems, control lines, and various important locations requiring flame retardancy, fire resistance, smokelessness, non-toxicity, and high temperature resistance. They can be widely used in nuclear power plants, power plants, steel plants, oil wells, computer rooms, schools, entertainment venues, densely populated places, and high-rise buildings.
With social progress, scientific development, and increased environmental awareness, the demand for irradiated cross-linked low-smoke halogen-free flame-retardant and fire-resistant wires and cables will continue to grow. At the same time, research on new materials to replace copper conductors will gradually deepen, and the development of irradiated cross-linked low-smoke halogen-free flame-retardant and fire-resistant wires and cables will have a very broad prospect.
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