1K107 Fe-Based Toroidal Magnetic Nanocrystalline Core for Electric Transformer
Oct 24, 2025
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The Fe-Based Toroidal Magnetic Nanocrystalline Core is a soft magnetic component made by tightly winding Fe-based nanocrystalline alloy strips into a toroidal shape. Its core advantages are low loss at high frequencies, efficient magnetic circuits, and compact structure. It can be adapted to both transformers and inductors, serving as a key component for high-frequency electronic devices to achieve "high efficiency + miniaturization".
Nanocrystalline Core Advantages
1. Excellent High-Frequency Performance and Extremely Low Loss
The applicable frequency covers the kHz to MHz range, far exceeding Fe-based silicon steel cores that can only be used for power frequency (50/60Hz).
Its iron loss at high frequencies is much lower than that of traditional cores. Even at MHz-level frequencies, the loss remains low, which can reduce equipment heat generation and improve overall energy efficiency (e.g., the conversion efficiency of high-frequency power supplies can reach over 95%).
2. High Magnetic Circuit Efficiency and Low Magnetic Leakage
The closed toroidal structure has no splicing gaps, and the magnetic leakage is only 1/5-1/10 of that of open magnetic circuit cores (such as EI-type and UU-type cores), resulting in less magnetic energy waste.
When Fe-based nanocrystalline strips are wound, the grain orientation is uniform and the magnetic resistance is extremely low. Whether for "magnetic energy transfer" of transformers or "magnetic energy storage" of inductors, the efficiency is significantly better than that of traditional cores.
3. Compact Size, Suitable for Miniaturization
The material has high magnetic permeability (initial permeability usually > 80,000). For the same magnetic performance requirement, its volume and weight are only 1/3-1/2 of those of Fe-based silicon steel toroidal cores.
The toroid has no protruding edges and can be flexibly adapted to narrow spaces inside equipment, especially suitable for volume-sensitive scenarios such as server power supplies and on-board chargers.
4. Stable Performance and Strong Environmental Adaptability
It has a high Curie temperature (approximately 570-600℃). Within the wide temperature range of -40℃ to 150℃, key parameters such as magnetic permeability and saturation magnetic induction intensity decay slowly, enabling it to adapt to outdoor and industrial high-temperature environments.
Its mechanical strength is superior to that of ferrite cores (ceramic materials are easy to break), with strong vibration and impact resistance, making it suitable for harsh working conditions such as vehicle-mounted and aerospace applications.
Nanocrystalline Toroidal Core Comparison with Three Mainstream Core Types
1. Comparison with Fe-Based Silicon Steel Toroidal Cores
| Comparison Dimension | Fe-Based Toroidal Magnetic Nanocrystalline Core | Fe-Based Silicon Steel Toroidal Core |
|---|---|---|
| Applicable Frequency | High frequency (kHz-MHz range) | Power frequency (50/60Hz only) |
| High-Frequency Iron Loss | Extremely low | Extremely high (unusable at high frequencies) |
| Size and Weight | Small and light (optimal for the same power) | Large and heavy |
| Core Applicable Scenarios | High-frequency power supplies, inverters, precision inductors | Power frequency distribution transformers, low-frequency power supplies |
2. Comparison with Ferrite Toroidal Cores
| Comparison Dimension | Fe-Based Toroidal Magnetic Nanocrystalline Core | Ferrite Toroidal Core |
|---|---|---|
| Saturation Magnetic Induction | Medium (Bs≈1.2-1.3T, suitable for medium-to-high power) | Low (Bs≈0.3-0.5T, prone to magnetic saturation) |
| Maximum Applicable Frequency | Medium (up to approximately 1MHz) | High (up to over 100MHz) |
| Mechanical Strength | High (alloy strips, impact-resistant) | Low (ceramic material, easy to break) |
| Core Applicable Scenarios | Medium-to-high frequency, medium-to-high power equipment | Ultra-high frequency, low-power equipment (e.g., communication modules) |
3. Comparison with Amorphous Toroidal Cores
| Comparison Dimension | Fe-Based Toroidal Magnetic Nanocrystalline Core | Amorphous Toroidal Core |
|---|---|---|
| Magnetic Permeability | Higher (initial μi is approximately 1.5-2 times that of amorphous cores) | Relatively high |
| High-Frequency Loss | Lower (loss at 1MHz is 20%-30% lower than that of amorphous cores) | Slightly higher |
| Temperature Stability | Better (slower performance decay at high temperatures) | Average (Curie temperature is lower than that of nanocrystalline cores) |
| Core Applicable Scenarios | High-precision, high-frequency equipment (medical, aerospace) | Medium-to-high frequency general equipment (e.g., industrial power supplies) |
Nanocrystalline ring Core specification
| Magnetic core size(mm) | Protective box size(mm) | Effective cross-sectional area Ae(mm2) | Magnetic path length Ie(mm) | Maximum DC overcurrent class (A) |
||||||
| id | od | ht | ID | OD | HT | |||||
| 14 | 19 | 6.5 | 12 | 22 | 8 | 11.86 | 51.81 | 20 | ||
| 14 | 20 | 10 | 12 | 22.3 | 11.4 | 29.68 | 52.29 | 40 | ||
| 16 | 21 | 10 | 15 | 24 | 12.3 | 24.85 | 57.41 | 60 | ||
| 16 | 23 | 8 | 15 | 24 | 9.7 | 20.44 | 61.23 | 60 | ||
| 16 | 23 | 10 | 15 | 24 | 12.3 | 34.62 | 59.92 | 60 | ||
| 17 | 22 | 10 | 15.3 | 24.4 | 12.3 | 24.86 | 60.59 | 60 | ||
| 17 | 21 | 8 | 15.3 | 24 | 9.7 | 25.56 | 60.67 | 60 | ||
| 17 | 23 | 8 | 15.3 | 24.4 | 9.7 | 26.89 | 61.34 | 60 | ||
| 18 | 23 | 10 | 16.4 | 24.4 | 12.3 | 29.78 | 60.38 | 70 | ||
| 18 | 24 | 9 | 16.4 | 25 | 11.2 | 34.78 | 60.89 | 70 | ||
| 18 | 25 | 10 | 16.4 | 25.9 | 12.3 | 37.97 | 64.56 | 70 | ||
| 19 | 24 | 9 | 17.3 | 25 | 11.2 | 40.39 | 65.32 | 80 | ||
| 19 | 25 | 10 | 17.3 | 26 | 12.3 | 39.42 | 62.31 | 80 | ||
| 19 | 26 | 10 | 17.3 | 27.3 | 12.3 | 48.32 | 69.56 | 80 | ||
| 20 | 25 | 10 | 18.5 | 26.3 | 12.3 | 39.29 | 70.32 | 90 | ||
| 20 | 28 | 10 | 18.5 | 29 | 12.3 | 45.76 | 73.88 | 90 | ||
| 20 | 32 | 10 | 18.5 | 32.3 | 12.3 | 58.91 | 78.75 | 90 | ||
| 21 | 29 | 10 | 18.2 | 31.3 | 12.3 | 39.65 | 77.19 | 100 | ||
| 21 | 26 | 8 | 18.3 | 27.4 | 9.7 | 46.54 | 78.32 | 100 | ||
| 21 | 28 | 10 | 18.3 | 30 | 12.3 | 50.39 | 77.45 | 100 | ||
| 22 | 28 | 10 | 20.5 | 30 | 12.3 | 49.32 | 79.89 | 120 | ||
| 22 | 32 | 10 | 20.5 | 33.4 | 12.3 | 43.58 | 73.43 | 120 | ||
| 23 | 32 | 10 | 21.3 | 33.4 | 12.3 | 44.56 | 74.56 | 120 | ||
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