coreless

adj.

无果心的，无核心的，无芯的；

Coreless Thomas–Fermi models of atomic structure
Coreless vortex formation in a spinor Bose-Einstein condensate.
Coreless superthin PCB transformer and non-contact battery charger using the same
Characterization of coreless printed circuit board (PCB) transformers
Optimal design of a coreless stator axial flux permanent-magnet generator
Coreless planar printed-circuit-board (PCB) transformers-a fundamental concept for signal and energy transfer
Optimal operation of coreless PCB transformer-isolated gate drive circuits with wide switching frequency range
Design, Prototyping, and Analysis of a Low Cost Axial-Flux Coreless Permanent-Magnet Generator
High-performance flip-chip BGA technology based on thin-core and coreless package substrate
The Half-Yearly Oscillations in Middle and High Southern Latitudes and the Coreless Winter.