The stator lead wire of the motor is an important component that connects to the winding itself and determines the external wiring of the stator. The diameter and insulation structure of the lead wire should match the performance requirements of the motor. In addition, the issue of the lead wire's exit also needs to be addressed.
From a cost control perspective, the lead wire length should be as short as possible. Following this approach, the cable outlet of the motor base is usually designed at one end of the base, thus reducing the amount of lead wire used. This is especially important for large-sized products, where lead wire usage has a significant impact. However, for small-sized products or motors used for other purposes, considering overall installation and aesthetics, the cable outlet is often designed in the middle of the motor base's axial direction. This requires a significant increase in lead wire length. Another issue is securing the lead wire during the lead-out process. If the lead wire is in a free state during lead-out, it may break due to vibration or burrs on the motor base during operation, leading to a ground fault. Therefore, the lead wire lead-out, the design of the motor base, and the control of the lead-out process are indeed major issues that must be carefully addressed.
Main properties of silicone rubber
Silicone rubber leads are widely used in motors. Ms. [Name] and others have briefly summarized the main properties of silicone rubber, highlighting that silicone rubber leads fully utilize the characteristics of silicone rubber.
●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.
●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.
● Weather resistance. The Si-O-Si bonds in silicone rubber are very stable against oxygen, ozone, and ultraviolet light, giving it excellent weather resistance without any additives.
● Electrical properties. Silicone rubber has excellent insulation properties, as well as very good resistance to corona and arc.
●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.
● Oil and chemical resistance. Ordinary silicone rubber has moderate oil and solvent resistance.
●Gas permeability. 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.
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