Actuator for damping low-frequency oscillations

摘要

An actuator has an electrically conductive coil which has a longitudinal axis and windings through which a current can flow. The coil is surrounded by a highly permeable first ferromagnetic body so that the first body has projections of highly permeable ferromagnetic material above and below the coil in the longitudinal direction. The actuator has a magnet spaced apart from the coil so that a gap forms therebetween. The magnet is surrounded by a highly permeable second ferromagnetic body so that the second body has projections of highly permeable ferromagnetic material above and below the magnet in the longitudinal direction. The magnet is statically mounted with the second body and the coil is spring mounted with the first body so that the coil and first body oscillate in the longitudinal direction when an alternating current flows through the coil. The coil is outside the magnet perpendicular to the longitudinal axis.

主权项

1. An actuator comprising:
an electrically conductive coil defining a longitudinal axis (L) and having a plurality (n) of winding turns configured to have an electrical current flow therethrough; a first ferromagnetic body of high permeability surrounding said electrically conductive coil in such a manner that said first ferromagnetic body has collar-like projections of ferromagnetic material of high permeability above and below said electrically conductive coil in the direction of said longitudinal axis (L); at least one magnet; a second ferromagnetic body of high permeability surrounding said at least one magnet such that said second ferromagnetic body has collar-like projections of ferromagnetic material of high permeability above and below said at least one magnet in the direction of said longitudinal axis (L); said at least one magnet being spaced substantially perpendicularly from said winding turns with respect to said longitudinal axis (L) and said collar-like projections of said first ferromagnetic body being spaced substantially perpendicularly from said collar-like projections of said second ferromagnetic body so as to cause said electrically conductive coil, said magnet, said collar-like projections of said first ferromagnetic body, and said collar-like projections of said second ferromagnetic body to conjointly define an air gap therebetween; said air gap having a constant width; said at least one magnet having a side facing away from said air gap; said electrically conducting coil having a side facing away from said air gap; said first ferromagnetic body being disposed on said side of said electrically conductive coil facing away from said air gap; said second ferromagnetic body being disposed on said side of said magnet facing away from said air gap; said at least one magnet being statically mounted together with said second ferromagnetic body; said electrically conductive coil being spring mounted together with said first ferromagnetic body so as to enable said electrically conductive coil together with said first ferromagnetic body to oscillate in the direction of said longitudinal axis (L) when an alternating current is flowing through said electrically conductive coil; and, said electrically conductive coil being arranged outside of said magnet perpendicularly with respect to said longitudinal axis (L).