EP 0172080 B1 19880601 - POLARISED ELECTROMAGNET WITH THREE POSITIONS AND CONTROL CIRCUIT
Title (en)
POLARISED ELECTROMAGNET WITH THREE POSITIONS AND CONTROL CIRCUIT
Publication
Application
Priority
FR 8411517 A 19840720
Abstract (en)
[origin: US4609899A] A three-state polarized electromagnet comprises a stationary system (1) surrounded by a coil (5) and a moving system (7). Each system consists of a permanent magnet (2; 14) fitted with pole pieces (3, 4; 12, 13). The ends of the pole pieces are bent-back towards each other in order to define four air-gaps (E1 to E4) for permitting displacement of the moving system (7) between two end positions. One end portion of a pole piece forms part of only one air-gap and the air-gap faces are joined to pole faces of permanent magnets having the same polarity in order to reduce to zero the fluxes within the air-gaps which are closed when no excitation is applied and in order to permit a return to a stable central position.
IPC 1-7
IPC 8 full level
H01F 7/08 (2006.01); H01H 51/22 (2006.01); H01H 51/24 (2006.01); H01H 51/26 (2006.01); H01H 51/00 (2006.01)
CPC (source: EP US)
H01H 51/2209 (2013.01 - EP US); H01H 51/005 (2013.01 - EP US); H01H 2051/2218 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB IT
DOCDB simple family (publication)
EP 0172080 A1 19860219; EP 0172080 B1 19880601; DE 3563144 D1 19880707; FR 2568056 A1 19860124; FR 2568056 B1 19870123; JP S61114430 A 19860602; US 4609899 A 19860902
DOCDB simple family (application)
EP 85401463 A 19850717; DE 3563144 T 19850717; FR 8411517 A 19840720; JP 15848985 A 19850719; US 75651185 A 19850718