Patent ID: 6859122
Filing Date: 2005-02-22
Classification: F04B,H01H,Y10T

Abstract:
1. Magnetic actuator having a closed magnetic circuit ( 26 ) capable of guiding a magnetic flux, this magnetic circuit ( 26 ) comprising a fixed magnetic part ( 30 , 31 , 32 ) with a yoke ( 30 ) and a mobile magnetic part ( 22 ), magnetically connected to each other and also at least one main air gap ( 29 ) delimited by at least one portion ( 28 ) of the mobile magnetic part ( 22 ) and by the yoke ( 30 ), in which the magnetic flux is closed by being set up approximately transverse to the mobile magnetic part ( 22 ), characterised in that the fixed magnetic part ( 30 , 31 , 32 ) comprises flux recuperation means ( 40 ) that contribute with the mobile part ( 22 ) to delimiting an auxiliary air gap ( 38 ) in which the magnetic flux is set up laterally to the mobile part ( 22 ), the magnetic flux being contained on each side of the main air gap ( 29 ), on one side by the yoke ( 30 ), and on the other side jointly by the mobile part ( 22 ) and the flux recuperation means ( 40 ) through the part ( 28 ) contributing to delimiting the main air gap ( 29 ), the dimension of the auxiliary air gap ( 38 ) in the direction in which magnetic flux is set up being a minimum in at least one area of the portion ( 28 ) contributing to delimiting the main air gap ( 29 ).