1K107 Nanocrystalline Square Iron Core for Efficient Transformers

 

 

Core Characteristics of Nanocrystalline Square Iron Core

 

The characteristics of nanocrystalline square iron core stem from the synergy between "material performance" and "square structure". It not only retains the advantages of nanocrystalline materials but also solves space and assembly problems in practical applications through structural optimization.

 

1. Material Level: Inheriting High-Efficiency Magnetic Performance of Nanocrystals

 

Extremely Low Iron Loss: In medium-high frequency scenarios (e.g., 50kHz-200kHz), the iron loss (P₁/100k) is only 15-30W/kg, far lower than that of silicon steel (150-200W/kg). This significantly reduces equipment temperature rise and cuts the cost of heat dissipation modules.

 

High Magnetic Permeability and Low Coercive Force: The initial magnetic permeability (μi) reaches 5×10⁴-2×10⁵H/m, and the coercive force (Hc) ≤2A/m. It enables efficient magnetic conduction even under weak magnetic fields, making it suitable for precision current/voltage conversion scenarios.

 

Wide Temperature Range Stability: The operating temperature range is -50℃-150℃, with a Curie temperature (Tc) of 400-450℃. The magnetic performance attenuation is ≤3% during long-term use (10-year cycle), adapting to harsh environments such as industrial and on-board applications.

 

2. Structural Level: Application Advantages of Square Design

 

Over 30% Higher Space Utilization: The square cross-section can fit closely with rectangular windings, avoiding the "gap waste" between toroidal cores and rectangular windings. Under the same power, the equipment volume is 20%-40% smaller than that of toroidal core solutions.

 

High Convenience in Assembly and Winding: The flat design of the square structure facilitates the operation of automatic winding machines. The tension is more uniform when winding, reducing the risk of enameled wire damage. At the same time, it adapts to the rectangular installation cavity of modular equipment, simplifying the overall structural design of the machine.

 

Flexible Air Gap Design: Air gaps can be accurately set on the center column or side of the square core, effectively controlling the linearity of inductance value. This is especially suitable for scenarios requiring stable inductance, such as reactors and PFC (Power Factor Correction) inductors.

 

3. Performance Shortcomings

 

Slightly Inferior Magnetic Circuit Uniformity to Toroidal Cores: The square structure has corner magnetic circuits, leading to slightly higher local magnetic resistance. At high frequencies (e.g., ＞200kHz), the magnetic permeability fluctuation is 5%-10% larger than that of toroidal cores, which needs to be compensated by optimizing the winding method.

 

Higher Cost Than Silicon Steel Square Cores: The cost of nanocrystalline ribbons and square pressing processes is relatively high. The price of nanocrystalline square cores of the same size is about 2-3 times that of silicon steel square cores, making them more suitable for high-end scenarios sensitive to energy efficiency and volume.

 

 

Nanocrystalline Iron Core Application

 

The "high efficiency + space-saving" characteristics of nanocrystalline square iron cores make them advantageous in scenarios requiring medium-high frequency, high power density, and small volume. Their main application fields are as follows:

 

1. Power Electronic Equipment: Core Magnetic Components

 

Medium-High Frequency Transformers: Such as 50kHz-200kHz switching power supply transformers and on-board charger (OBC) transformers for new energy vehicles. The square structure adapts to the narrow and long installation space of on-board equipment, and the low iron loss feature reduces the temperature rise of on-board power supplies.

 

PFC Inductors and Filter Inductors: In industrial frequency converters and UPS (Uninterruptible Power Supplies), the air gap design of square cores can stabilize inductance values, suppress current harmonics, and meet EMC (Electromagnetic Compatibility) standards.

 

Charging Pile Modules: In the DC/DC conversion modules of DC charging piles, square cores are matched with flat wire windings to achieve "high power density (＞3kW/L) + low loss", adapting to the miniaturization needs of charging piles.

 

2. New Energy Field: Adapting to Harsh Environments

 

Photovoltaic Inverters: Used in grid-connected inductors of inverters, the square structure adapts to the rectangular chassis of inverters, and the wide-temperature stability can withstand the outdoor high and low temperature environments (-30℃-120℃) of photovoltaic power stations.

 

Energy Storage Systems: Inductive components of energy storage converters (PCS). The low iron loss feature improves the charge-discharge efficiency of energy storage systems, and the square design facilitates multi-module stacking to optimize the internal layout of energy storage cabinets.

 

3. Industrial and Special Equipment: Precisely Meeting Requirements

 

Precision Power Supplies: Special power supplies for medical equipment (e.g., MRI nuclear magnetic resonance, laser therapy equipment). High magnetic permeability ensures the accuracy of current/voltage conversion, and low loss reduces electromagnetic interference, ensuring the accuracy of medical testing.

 

Rail Transit Equipment: Auxiliary power systems for subways and high-speed railways. The anti-vibration performance of square cores (higher structural rigidity than toroidal cores) adapts to the bumpy environment of rail transit, and the wide-temperature feature withstands temperature fluctuations in carriages.

 

 

Performance Comparison with Mainstream Square Iron Cores

 

To clarify the positioning of nanocrystalline square iron cores, the following table compares their core differences with silicon steel square iron cores and ferrite square iron cores:

 

Comparison Dimension	Nanocrystalline Square Iron Core	Silicon Steel Square Iron Core (30Q130)	Ferrite Square Iron Core (Mn-Zn)
Saturation Magnetic Induction (Bs)	1.2-1.5T	1.8-2.0T	0.3-0.5T
Iron Loss (P₁/100k)	15-30W/kg	120-180W/kg	8-15W/kg (high-frequency advantage)
Initial Magnetic Permeability (μi)	5×10⁴-2×10⁵H/m	3×10³-5×10³H/m	1×10³-1×10⁴H/m
Operating Frequency Range	50kHz-200kHz	50Hz-1kHz (mainly power frequency)	100kHz-1MHz (ultra-high frequency)
Space Utilization	High (adapts to rectangular windings)	High (same structure)	High (same structure)
Cost (Relative Value)	2.5-3.0	1.0 (benchmark)	1.8-2.2
Applicable Scenarios	Medium-high frequency, high power density equipment	Power frequency, high-power equipment	Ultra-high frequency, low-power filtering equipment