Patent ID: 9608503
Date: 2017-03-28
CPC Classifications: H01F,H02K

Claim:
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).