行业组件数据 · 2026

环形磁芯

A toroidal core is a doughnut-shaped magnetic component used in differential current transformers for precise current measurement and isolation.

技术定义与适配语境
典型 环形磁芯 会按材料、尺寸公差、适配关系和失效风险在 电气设备制造 中评估。

A toroidal core is a closed-loop magnetic core with a toroidal (doughnut) shape, typically made from ferromagnetic materials like ferrite, powdered iron, or amorphous alloys. In differential current transformers, it serves as the magnetic circuit that concentrates the magnetic flux generated by primary and secondary windings, enabling accurate current sensing, galvanic isolation, and common-mode noise rejection. Its symmetrical design minimizes external magnetic interference and leakage flux, making it ideal for sensitive measurement applications.

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组件规格

定义
A toroidal core is a closed-loop magnetic core with a toroidal (doughnut) shape, typically made from ferromagnetic materials like ferrite, powdered iron, or amorphous alloys. In differential current transformers, it serves as the magnetic circuit that concentrates the magnetic flux generated by primary and secondary windings, enabling accurate current sensing, galvanic isolation, and common-mode noise rejection. Its symmetrical design minimizes external magnetic interference and leakage flux, making it ideal for sensitive measurement applications.
工作原理
The toroidal core operates on electromagnetic induction principles. When alternating current flows through the primary winding wrapped around the core, it induces a magnetic flux within the core. This flux, proportional to the current, links with the secondary winding, inducing a voltage that can be measured to determine the current. In differential configurations, it compares currents from multiple sources to detect imbalances, such as ground faults or leakage currents, by canceling out common-mode signals while amplifying differential signals.
材料
Common materials include: Ferrite (e.g.MnZn or NiZn for high-frequency applications up to MHz range)Powdered Iron (for lower frequencies and high saturation flux density)Amorphous Alloys (e.g.Metglas for high efficiency and low core loss)and Silicon Steel (for power frequency applications). Material grades vary based on permeabilitysaturation flux densityand core loss specifications.
Height
5 mm to 50 mm
Core Loss
< 100 mW/cm³ at 100 kHz, 200 mT
Insulation
Class B or higher (130°C)
Permeability
2000 to 15000 μ (typical)
Core Material
Ferrite (e.g., N87, PC40)
Inner Diameter
10 mm to 150 mm
Outer Diameter
20 mm to 200 mm (typical range)
Operating Temperature
-40°C to +125°C
Saturation Flux Density
300 mT to 500 mT
标准
ISO 9001IEC 61869DIN EN 50178

行业分类与别名

环形磁芯 的常用贸易名称、技术标识和检索关键词。

toroidal coredifferential current transformermagnetic coreferrite corecurrent sensingelectrical componentIEC 61869环形磁芯Toroidal Core电气设备制造 环形磁芯

上级产品

该组件会出现在以下整机或工业产品中。

差动电流互感器
一种用于测量两根导体中电流差值的电流互感器，主要用于接地故障检测。
查看产品详情 ->

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Overcurrent or DC bias in the primary winding->Core saturation, resulting in nonlinear output and inaccurate current measurement->Design with adequate core size and material saturation margin, use current limiters or bias compensation circuits
Physical stress or cracks in the core material->Increased core loss, reduced permeability, and potential short circuits in windings->Implement strict quality control during manufacturing, use protective coatings, and avoid mechanical shock during installation
High ambient temperature or poor ventilation->Thermal degradation of core material and insulation, leading to performance drift or failure->Ensure proper heat dissipation, select high-temperature-rated materials, and monitor operating conditions

工业生态与工程逻辑

兼容对象
Differential Current TransformersLeakage Current SensorsGround Fault Circuit InterruptersPower Monitoring Systems
可替换件
TDKFerroxcubeMagnetics Inc.VACUUMSCHMELZE
0
Core saturation leading to measurement errors
1
Mechanical damage from improper handling
2
Thermal runaway under overload conditions
3
Incorrect material selection causing frequency mismatch

合规与检测

tolerance
±5% for magnetic parameters (e.g., permeability), ±2% for dimensional specs under standard conditions
test method
Testing per IEC 61869 for current transformer accuracy, including ratio error, phase displacement, and temperature cycling; material analysis via B-H curve measurement and core loss testing

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技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例，不代表真实客户评分、具体国家买家反馈或实时询盘。

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常见问题

What is the advantage of a toroidal core over other shapes in current transformers?

Toroidal cores offer low magnetic leakage, high efficiency, and symmetrical flux distribution, reducing external interference and improving measurement accuracy in differential applications.

How do I select the right material for a toroidal core?

Choose based on frequency range, saturation flux, and core loss requirements: ferrite for high frequencies, powdered iron for medium frequencies, and amorphous alloys for high efficiency at power frequencies.

Can toroidal cores be used in high-temperature environments?

Yes, with materials rated for high temperatures (e.g., certain ferrites up to 125°C) and proper insulation, but performance may degrade if limits are exceeded.

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