Nano crystalline cores are Iron Based cores which is a specially developed soft magnetic material with low magneto striction, high permeability (150000), saturation flux density of 1.25t and working temperature of 120 degrees celsius and above.
They are widely replacing Mu metal cores (NI FE) cores mainly because of its lower cost and CRGO core for improvement in accuracy class up to 0.2S class. Nano crystalline steel saturates at 1.25 Tesla against 0.77 Tesla in case of mu metal.
Advantages over CRGO are Extremely Low Co-ercivity, High Permeability.Low Losses.High saturation Flux Density.
There is a need to encapsulate these cores by stainless steel casing to avoid any changes in electrical values after winding, resin casting and avoid drop in performance.
|Density||: 7.24/7.3 gms / cc|
|Filling Factor||: 78%-80%|
|Saturation Induction||: 1.25 T|
|Curie Temperature||: 600 deg C|
|Max Operating Temperature||: 150 deg C|
- Max outside diameter: 600mm
- Max height: 80 mm
COMPARISON OF DIFFERENT MATERIALS
|PROPERTY||NANOCRYSTALLINE CORES||PERMALLOY CORES||SI-STEEL CORES|
|Saturate induction (T)||1.25||0.76||2.03|
|Initial permeability (0.8mA/cm)||40,000 ~ 80,000||> 80,000||1,000|
|Maximum permeability||>250,000||> 200,000||40,000|
|Curie temperature (°C)||570||400||740|
|Thickness (mm)||0.025 ~ 0.035||0.1||0.3|