公开(公告)号：US20250111972A1

公开(公告)日：2025-04-03

申请号：US18893169

申请日：2024-09-23

Applicant: Apple Inc.

Inventor： John C. DiFonzo ,  Mitsutoshi Makihata ,  Jean-Marc Gery

IPC: H01F7/06 ,  H01F7/02 ,  H01F7/20

Abstract: Magnetic systems can include a controllable magnet array and a fixed magnetic array. The fixed magnetic array can include an array of permanent magnets having alternating polarization direction transverse to the array. Some controllable magnet arrays can include electropermanent magnets (EPMs) arranged end-to-end, with pole pieces between them aligned to the permanent magnets of the fixed magnet array. Each EPM can include a permanent magnet having a fixed magnetic orientation lateral to the array and antiparallel to the permanent magnet in an adjacent EPM and a switchable magnet whose magnetic orientation can be switched between parallel and antiparallel to the permanent magnet in the EPM.