LAN transformers play a crucial role in communication networks, especially in terms of electromagnetic interference suppression, signal isolation, and impedance matching. One of the core components is the winding, with the magnetic core being a key material in the winding process. This article provides a detailed overview of the selection of magnetic core materials for LAN transformers.
1.1 Large Magnetic Cores
Large magnetic cores, also known as transformer cores, are typically made from Mn-Zn (manganese-zinc) ferrite materials. These cores generally have an initial permeability that is high and a UI value greater than 2000, making them suitable for low-frequency applications.
1.2 Small Magnetic Cores
Small magnetic cores, also known as common-mode choke cores, are usually made from Ni-Zn (nickel-zinc) ferrite materials. These cores typically have a UI value less than 2000 and lower initial permeability, making them suitable for high-frequency applications.
Winding materials are usually chosen from high-purity enameled copper wire. Selecting the appropriate winding material is crucial for ensuring transformer performance. The copper wire commonly used in LAN transformers is QPN/180 polyurethane enameled copper wire. Depending on specific performance requirements, such as insulation and overcurrent capability, different types of enameled wires may be used. The choice of wire will depend on the specific product requirements detailed in the product specifications.
3.1 Casing
The casing, also known as CASE, is typically made from phenolic molding powder (bakelite powder). The size of the casing is selected based on product requirements.
3.2 Insulating Oil
The insulating oil generally used is Insulating Oil E962.
3.3 Solder
The solder commonly used is SnCu (tin-copper), though some applications may use silver-containing tin solder.
3.4 Flux
The flux typically used is 787M-3 or similar.
This guide provides an overview of the essential materials and their characteristics required for LAN transformer manufacturing, ensuring that the transformers perform efficiently and reliably in their intended applications.
LAN变压器在通信网络中扮演着至关重要的角色，尤其在电磁干扰抑制、信号隔离和阻抗匹配方面。其核心部件之一是绕线，而磁芯则是绕线的关键材料之一。本文将详细介绍LAN变压器磁芯材料的选择。
1.1 大型磁芯
大型磁芯，也叫变压器磁芯，通常采用Mn-Zn（锰锌）铁氧体材料。这些磁芯一般具有高初始磁导率和UI值大于2000，适用于低频应用。
1.2 小型磁芯
小型磁芯，也叫共模电感环，通常采用Ni-Zn（镍锌）铁氧体材料。这些磁芯的UI值一般小于2000，初始磁导率较低，适用于高频应用。
绕线材料通常选择高纯度的漆包铜线。选择合适的绕线材料是确保变压器性能的关键因素。常规LAN变压器使用的铜线通常为QPN/180聚氨酯漆包铜线。根据绝缘性和过电流能力等具体性能要求，可能会使用不同类型的漆包线。具体的线材选择将依据产品规格中的要求。
3.1 外壳
外壳，也叫CASE，通常由酚醛模塑粉（电木粉）制成。外壳的尺寸根据产品要求进行选择。
3.2 绝缘油
一般使用绝缘油E962。
3.3 焊料
常用的焊料是SnCu（锡铜），也有部分应用使用含银的锡焊料。
3.4 助焊剂
通常使用787M-3或类似的助焊剂。
本指南概述了LAN变压器制造所需的基本材料及其特性，确保变压器在预期应用中的高效和可靠性能。
