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Pub. No.:    WO/2018/220397    International Application No.:    PCT/GB2018/051507
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat Jun 02 01:59:59 CEST 2018
IPC: H01F 7/11
H01F 7/08
H01F 7/16
H02K 41/03
G07F 17/00
A63F 9/30
B25J 15/02
Applicants: ELAUT NV
Inventors: KELLY, Hugh-Peter Granville
A short stroke actuator comprising comprising an annular field coil housed in a housing and a composite plunger for relative travel threrethrough, the composite plunger comprising two permanent magnets axially in line but spaced one from the other and with like poles facing, wherein the coil experiences a thrust in use, when energised, relative to the plunger by interaction of the magnetic field produced by energization of the coil with the magnetic fields produced by the permanent magnets, and wherein at the centre of a stroke, the thrust is produced by interaction of the magnetic field of the coil with the magnetic fields of both permanent magnets, characterised by means to prevent or substantially limit the circulation of eddy currents within the housing of the actuator during motion of the plunger.