1K107 Nanocrystalline Ring-Type Iron Cores for Transformers

What Is a Nanocrystalline Ring-Type Iron Core

The nanocrystalline ring-type iron core is a closed toroidal soft magnetic component made by tightly winding iron-based nanocrystalline alloy strips. Its core advantages are no magnetic circuit leakage, low loss at high frequencies, and a compact structure. It balances magnetic performance with equipment miniaturization requirements in high-frequency scenarios and is a key alternative to traditional silicon steel toroidal cores.

Comparison with Amorphous Cores

Magnetic permeability: the initial permeability of nanocrystalline toroidal cores is usually 60000 to 150000, while amorphous cores are generally 20000 to 50000. Saturation induction: iron-based amorphous cores reach about 1.56 T, while nanocrystalline cores reach 1.2 to 1.3 T, slightly lower. Coercivity: nanocrystalline cores can be as low as 0.5 A/m, versus 1 to 3 A/m for amorphous, giving an advantage in high-frequency applications. Iron loss: at 50 Hz, nanocrystalline cores can be lower than 0.1 W/kg, while amorphous cores are about 0.2 W/kg. Frequency range: amorphous cores suit 10 kHz to 100 kHz, while nanocrystalline cores reach 20 kHz to 1 MHz. Curie temperature: nanocrystalline cores are about 570 to 600 degrees C, versus about 415 degrees C for amorphous, providing better temperature stability.

Comparison with Ferrite and Silicon Steel Cores

Compared with Mn-Zn ferrite, nanocrystalline cores have much higher permeability (60000 to 150000 versus several thousand to tens of thousands), higher saturation induction for medium- and high-power applications, and better temperature stability, though ferrite supports higher frequencies above 100 MHz. Compared with silicon steel cores, nanocrystalline cores cover frequencies from kHz to MHz instead of power frequency only, have much higher permeability, much lower high-frequency loss, and smaller size and weight at the same power.

Specifications

Ring cores are available in a range of dimensions. For example, a core with an inner diameter of 14 mm, outer diameter of 19 mm, and height of 6.5 mm has an effective cross-sectional area of 11.86 square mm, a magnetic path length of 51.81 mm, and a maximum DC overcurrent class of 20 A. Larger cores with an inner diameter of 18 mm, outer diameter of 25 mm, and height of 10 mm offer an effective area of 37.97 square mm, a path length of 64.56 mm, and a DC overcurrent class of 70 A. Additional sizes are available on request.

Applications

Nanocrystalline ring cores are used in transformers and inductors, inverters and converters, current transformers for accurate measurement, residual current devices, and high-frequency power electronics where low loss and high permeability are required.

Frequently Asked Questions

Q: What is 1K107 material?

A: 1K107 is an iron-based nanocrystalline soft magnetic alloy designation. After rapid solidification and annealing, the strip develops a nanocrystalline structure with very high permeability and low core loss.

Q: Why use a ring (toroidal) shape?

A: The closed toroidal magnetic path has no air gap, eliminating magnetic circuit leakage and minimizing the magnetizing current, which maximizes the effective permeability of the material.

Q: What frequency range suits nanocrystalline ring cores?

A: They operate effectively from about 20 kHz up to 1 MHz, with usable performance from power frequency for special designs, making them suitable for switching power supplies and EMI filters.

Q: How do nanocrystalline cores improve current transformer accuracy?

A> High permeability and high saturation induction increase measurement accuracy, reduce the core volume, and improve linearity, meeting accuracy classes such as 0.2 or better.

Q: Can nanocrystalline ring cores replace silicon steel toroidal cores?

A: Yes, in high-frequency applications they offer much lower loss and smaller size, while in power-frequency applications the choice depends on loss and cost targets.

Q: What is the Curie temperature of nanocrystalline cores?

A: The Curie temperature is about 570 to 600 degrees C, which gives stable magnetic performance over a wide operating temperature range.

For a nanocrystalline ring core quotation with your required dimensions and overcurrent class, contact our sales team.