Amorphous Cores and Nanocrystalline Cores

Amorphous Cores and Nanocrystalline Cores

 

 

 

Amorphous Cores and Nanocrystalline Cores Function

Amorphous Cores and Nanocrystalline Cores Application

Typical Properties and Further Information

A comparison between Amorphous and Nanocrystalline...

Properties		Core Materials
	Units	Amorphous	Nanocrystalline
Max Frequency	Hz	50k	100k
Saturation Flux Density	Tesla	1.56	1.25
Initial Permeability	μi	Up to 7k	Up to 150k
DC Coercivity	A/m	2.4	0.84
Resistivity	Ω.μm	1.4	1.2
Curie Temperature	°C	550	570

 

Cores for Common Mode Chokes

Amorphous cores and nanocrystalline cores are ideally suited to being used in the function of common mode chokes.

 

The high permeability represents the opportunity for high inductance values that aids the suppression of the unwanted asymmetric conducted noise, interference and stray signals. Apart from the high permeability the core material also has a high magnetic flux saturation density, the transformers made from these cores have very accurate and repeatable values and characteristics. They lend themselves to miniaturisation.

 

There are a wide range of core dimensions available, and the flat stable thermal characteristics allow them to be used over a wide temperature range. Designs based on nanocrystalline products can offer maximum attenuation in a compact package for many EMI situations. The choke design will depend on the specific interference suppression issues within a particular product. These products are used extensively in renewable energy, electric motor drivers and electric vehicle charging applications.

 

The common mode choke can be found in many day-to-day applications including switch mode power supplies, photovoltaic inverter circuitry and almost anywhere there is a power supply function involved like arc welding apparatus.

 

Cores for Current Transformers in Electronic Energy Meters

The ultra-low loss material along with the transformer characteristic accuracy and precision lends itself for use as a current transformer for use in electronic energy meters and smart meters. The high linearity and small amplitude errors for different load conditions also contribute to the selection of amorphous cores and nanocrystalline cores to be used for metering applications. The transformers made from amorphous cores and nanocrystalline cores perform well under DC bias conditions

 

Cores for Residual Current Circuit Breakers

The characteristics required for common mode chokes as well as current transformers are combined to give the most suitable core material for residual current circuit breakers. High permeability along with the stable nature of the material characteristics over a wide temperature and frequency range allows ideal use in circuit breaker designs.