Wiki article · Collection 03

Nanocrystalline Cores

Engineering reference on Nanocrystalline Cores for wireless power system design, integration, and deployment.

6 minArticle 35/50Coil Design

Nanocrystalline Cores — educational diagram — Fig.: Educational diagram for “Nanocrystalline Cores”.

Nanocrystalline alloys (fine-grain metallic glass ribbons) offer very high permeability and high saturation flux density compared to many ferrites. In WPT they appear in compact receivers, common-mode chokes on coil leads, and flux concentrators where ferrite would be too bulky or saturate too early.

Ribbons are thin and stacked; cutting and gapping differ from sintered ferrite tiles. Mechanical shock can degrade performance if laminations shift.

01When they help

Tight receiver volume with high L target.
High flux density headroom in high-power transient peaks.
Common-mode suppression on long coil cables in AMR turrets.

Nanocrystalline Cores — supporting diagram — Fig.: Supporting illustration for “Nanocrystalline Cores”.

02Cautions

Cost exceeds ferrite for large pad areas — usually receiver-localized. Curie temperature and loss curves differ by grade — validate at operating frequency. Protect from moisture and bending below vendor bend radius.

03Integration

Potting must not crush ribbon stacks.
Match CTE with housing to prevent gap opening in cold warehouse floors.
EMC: high μ can also couple stray fields — shield thoughtfully.