铁氧体磁芯: 环形、罐形、其他形状和磁芯骨架

美磁铁氧体磁芯是氧化氮由铁(Fe),锰(Mn),和锌(Zn)组成,通常被称为锰锌铁氧体。铁氧体有低矫顽力,亦称为软磁铁氧体。由于在高频率下的低磁损,它们广泛用于开关模式电源(SMPS),射频(RF)变压器和电感器。各种形状和尺寸的铁氧体磁芯应用于高频电源和高质量通信市场的电感器,脉冲变压器,高频变压器,和噪音滤波器等。美磁铁氧体的最大特点是高渗透性,良好的温度特性,和低衰减率。美磁提供十种铁氧体材料,磁导率范围从900μ到10,000μ,并有不同的形状,包括环形非环形,和罐形。美磁提供各种变压器磁芯骨架,例如印刷电路线圈管,夹具,表面贴装型线圈骨架,磁环外壳和底座等。

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美磁铁氧体材料种类有(点击以下特定材料,进一步了解各材料的相关特性及曲线图):

开气隙的铁氧体(亦称间隙铁氧体),包括如何订购,以及按AL值或研磨深度开气隙的不同公差范围。

使用铁氧体的电源应用设计,包括变压器和电感器设计。

罐形铁氧体高线性度应用,具有磁性数据,温度特性,磁芯尺寸,配件和其他应用于高频调谐电路的线性电感器的设计标准。

铁氧体应用

Applications Desired Properties Preferred Materials Available Shapes
Broadband Transformers

Low loss, High µ (permeability), Good frequency response

J, W, M* Pot cores, Toroids, E, U & I cores, RM, EP cores
Common Mode Chokes Very high µ J, W, M* Toroids, E cores
Converter and Inverter Transformers Low losses, High saturation F, L, P, R, T Toroids, E, U & I cores, Pot cores, RS cores, Planar cores
Differential Mode Inductors Low losses, High temperature stability, Good stability across load conditions F, P, R, T Gapped pot cores, EP cores, E cores, RM cores, Planar cores, PQ cores
Narrow Band Transformers Moderate Q, High µ, High stability F, J Pot cores, Toroids, RM cores, EP cores
Noise Filters High µ, Good frequency response J, W, M Toroids
Power Inductors Low losses at high flux densities and temperatures, High saturation, Good stability across load conditions F, L, P, R Pot cores, E cores, PQ cores, RM cores, Planar cores
Power Transformers High µ and low losses at high flux densities and temperatures, High saturation, Low exciting currents F, L, P, R, T Ungapped pot cores, E, U & I cores, Toroids, EP cores, RS cores, DS cores, PQ cores, Planar cores
Pulse Transformers High µ, Low loss, High B saturation J, W, M Toroids
Telecom Inductors Low losses, High temperature stability, Good stability across load conditions F, P, R, T Pot cores, EP cores, E cores, RM cores, Planar cores
*M material available only in toroids
 

各种形状铁氧体磁芯的考量和比较

 

Toroid Core E Core EC, ETD, EER Cores ER, Planar Cores  PQ Cores Pot Core DS, RM Cores EP Core
Core Cost • • • • • • • • • • • • • • •
Bobbin Cost N/A • • N/A • • • • • •
Winding Cost • • •
Winding Flexibility • • • • • • • • • • • • • • •
Assembly Difficulty • • • • • • • •
Mounting Flexibility • • • • • • • • • • • • • • •
Heat Dissipation • • • • • • • • • • • • • •
Shielding • • • • • • • • • • • • •

表格说明

Lowest cost and/or Worst choice
• • Medium cost and/or Medium choice
• • • Highest cost and/or Best choice