During motor manufacturing, if the lead wires are impregnated with the windings, a direct problem is that the insulating varnish penetrates into the lead wires. After the windings are impregnated and dried, the lead wires become very hard, making subsequent handling extremely difficult. Careless handling can even lead to cracks, causing electrical malfunctions in the motor. This problem is even more severe for manufacturers using vacuum pressure impregnation technology.
To circumvent this problem, some manufacturers use a secondary wiring method, which involves connecting the lead wires after the windings exit the kiln, and then painting the connection part before putting it back into the kiln for drying. This approach is very uneconomical in terms of both efficiency and reliability.
A clever manufacturer invented a silicone rubber self-adhesive tape to address this problem. This tape is used to seal the connection between the lead and the main wire, as well as the other end of the lead. This solves the problem perfectly. Isn't that amazing? It proves that many inventions and creations are born out of necessity!
Main properties of silicone rubber
One commonly used type of lead wire in motors is the JG silicone rubber lead wire. Its wide applicability stems from the diverse properties of its insulating material, such as high-temperature adaptability, low-temperature adaptability, weather resistance, impregnation resistance, insulation performance, and good physical properties. Today, Ms. Can will share with you the main performance characteristics of silicone rubber.
●Low-temperature performance. The glass transition temperature of silicone rubber is generally -70~-50℃, and special formulations can reach -100℃, indicating its excellent low-temperature performance. This is of great significance to the aerospace industry.
●High-temperature performance. A significant characteristic of silicone rubber is its high-temperature stability. Although the strength of silicone rubber at room temperature is only half that of natural rubber or some synthetic rubbers, it can still maintain a certain degree of flexibility, resilience, and surface hardness in high-temperature environments above 200°C, and its mechanical properties do not change significantly.
● Weather-resistant silicone rubber has excellent weather resistance without the addition of any additives.
What is weather resistance? Weather resistance refers to the ability of materials such as coatings, building plastics, and rubber products to withstand the combined damage caused by outdoor weathering, including sunlight, temperature changes, wind, rain, and bacteria.
● Electrical insulation properties. Silicone rubber has excellent insulation properties, as well as very good resistance to corona and arc.
●Good physical and mechanical properties. The physical and mechanical properties of silicone rubber at room temperature are worse than those of general-purpose rubber, but at high temperatures of 150℃ and low temperatures of -50℃, its physical and mechanical properties are better than those of general-purpose rubber.
●Corrosion resistance and gas permeability. Silicone rubber is resistant to oil and chemical reagents; at room temperature, silicone rubber is 30-50 times more permeable to gases such as air, nitrogen, oxygen, and carbon dioxide than natural rubber.
● Physiological inertness. Silicone rubber is non-toxic, tasteless, odorless, does not adhere to human tissue, has anticoagulant properties, and exhibits very low reactivity to body tissues. It is particularly suitable as a medical material.
