The performance requirements for wire and cable products are mainly based on the specific application, usage conditions, and compatibility with supporting equipment. Among the various performance requirements of a product, some are primary and decisive, and should be strictly enforced; others are secondary, and sometimes certain factors are mutually restrictive. Therefore, they must be comprehensively studied, analyzed, and considered.
Motor lead wires are a type of wire and cable, and their basic properties include electrical, mechanical, thermal, corrosion resistance, weather resistance, and aging resistance. Some motor products have their stator lead wires connected after impregnation and drying, while others have them connected before stator varnishing. For processes where the connection is done before varnishing, the cable's resistance to varnishing, i.e., its corrosion resistance, requires relatively higher standards. Conversely, if the motor lead wires are connected after the windings exit the kiln, the lead wires should not become hard and brittle due to varnish penetration, and the cable insulation will not be damaged by the impregnation varnish. Ms. [ Name] will participate in a brief discussion.
1. Performance requirements of wires and cables
● Electrical performance. This refers to the cable's conductivity. Cable products are required to have good conductivity, and some products require a certain resistance range. For motor products, the cable is a key element connecting the motor windings to the driven equipment, requiring good conductivity and electrical insulation performance. Electrical insulation performance mainly includes its insulation resistance, dielectric constant, dielectric loss, and dielectric withstand characteristics. For special-purpose cables, transmission characteristics are also required, namely, the cable's high-frequency transmission characteristics and anti-interference characteristics.
●Mechanical properties. These properties mainly include tensile strength, elongation, bending resistance, elasticity, flexibility, vibration resistance, abrasion resistance, and resistance to mechanical impact. After the cable for motor products is connected to the motor winding itself, it must be connected to the terminal block through holes in the motor frame. For low-voltage high-power and high-voltage motors, the number of components the lead wires cross may be greater, thus requiring higher standards for the mechanical and insulation properties of the cable. Implementing necessary protective measures for the cable is also crucial.
● Thermal performance. This refers to the product's temperature rating, operating temperature, heating and cooling characteristics of power transmission wires and cables, current carrying capacity, short-circuit and overload capacity, thermal deformation and thermal shock resistance of synthetic materials, thermal expansion of materials, and drip properties of impregnated or coated materials. Different motor products should select appropriate lead wires according to the motor's heat resistance rating. Two points need to be emphasized here: first, the requirements of motor winding temperature rise on lead wires; second, the matching relationship between lead wire current carrying capacity and motor current.
● Corrosion and weather resistance. This refers to the cable's resistance to electrochemical corrosion, biological and bacterial erosion, chemical corrosion (oil, acid, alkali, chemical solvents, etc.), salt spray, light, cold, mildew, and moisture. For products with special operating conditions, lead wires should be selected according to requirements. In the motor manufacturing process, the compliance with impregnation resistance is crucial. Most motor lead wires are impregnated and dried along with the windings; therefore, lead wire manufacturers must clearly understand the customer's product processing technology and final operating conditions to avoid unnecessary problems.
●Aging performance. This refers to the ability of a product and its constituent materials to maintain their original performance under mechanical stress, electrical stress, thermal stress, and other external factors, or under external climatic conditions. For general-purpose motors, the aging of leads is primarily caused by thermal and electrical stress; however, for motors used in special environments, such as corrosive gases, premature aging of lead insulation can also occur.
●Other properties. These include the characteristics of some materials (such as the hardness and creep of metallic materials, and the compatibility of polymer materials) as well as certain special use characteristics of the product (such as non-flame retardancy, resistance to atomic radiation, insect resistance, time-delay transmission, and energy damping).
2. Brief introduction to JBQ motor lead wires
JBQ motor lead wire conductors should have a long-term permissible operating temperature not exceeding 70℃. They possess good flexibility and resistance to heat and solvents. These are wires used for connecting the windings of Class B insulated motors and electrical appliances with an AC rated voltage of 1140V and below, and for leading them out of the motor housing or connecting the windings to the terminals on the motor housing. This article provides a brief introduction to their insulation.
3. The composition of an eraser
Rubber is composed of several systems, including raw rubber itself and several auxiliary materials, such as filling and reinforcing systems, vulcanization systems, protective systems, plasticizing systems, and special additives such as colorants and fragrances.
● Filler reinforcement system: The purpose of filler reinforcement is to improve the tensile stress and resistance to damage of rubber (such as tensile strength, tear strength and abrasion resistance). It mainly uses talc, calcium carbonate, kaolin, carbon black and other raw materials.
● Vulcanization System: Vulcanization is a treatment method after coating the insulation layer or sheath layer. Its purpose is to allow the vulcanization system in the auxiliary system to take effect, causing the rubber to cross-link, increasing elasticity, and reducing plasticity. The term "vulcanization" originates from the fact that sulfur was originally used to cross-link rubber, and this name has been used ever since. Because sulfur molecules have a corrosive effect on copper wire conductors, current vulcanization systems mostly use sulfur-free or low-sulfur vulcanizing agents as the main vulcanizing agents, and different types and proportions of vulcanizing agents and accelerators are selected for different types of rubber to achieve the purpose of proper cross-linking (vulcanization) of the rubber.
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