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750μ到15,000μ，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。
铁氧体磁芯零件号标识
| 铁氧体材料 | 初始渗透率 | 应用 | 料特性曲线 |
|---|---|---|---|
L | 750µ ±25% | 电感器及电源变压器应用材料 | L Curves |
| R | 2,300µ ±25% | 电感器及电源变压器应用材料 | R Curves |
| P | 2,500µ ±25% | 电感器及电源变压器应用材料 | P Curves |
| F | 3,000µ ±20% | 电感器及电源变压器应用材料 | F Curves |
| T | 3,000µ ±25% | 电感器及电源变压器应用材料 | T Curves |
| J | 5,000µ ±20% | EMI/RFI滤波器及宽带变压器应用材料 | J Curves |
| W | 10,000µ ±30% | EMI/RFI滤波器及宽带变压器应用材料 | W Curves |
| M | 15,000µ | EMI/RFI滤波器及宽带变压器应用材料 | M Curves |
| C | 900µ | 线性变压器及传感器应用材料 | C Curves |
| E | 2,000µ | 线性变压器及传感器应用材料 | E Curves |
| V | 2,300µ | 线性变压器及传感器应用材料 | V Curves |
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 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 |