| 摘要 |
The present invention relates to an actuator (1) having an electrically conductive coil (35) which has a longitudinal axis L and a plurality n of turns and through which an electric current can be driven. The coil (35) is surrounded by a first ferromagnetic body (32) of high permeability in such a way that the first ferromagnetic body (32) has collar-like projections (33a, 33b), which are composed of ferromagnetic material of high permeability, above and below the coil (35) in the longitudinal direction L of the coil (35). The actuator (1) also has at least one magnet (25) which is spaced apart from the coil (35) substantially perpendicular to the longitudinal axis L in such a way that an air gap (4) is formed between the coil (35) and the magnet (25). The at least one magnet (25) is surrounded by a second ferromagnetic body (22) of high permeability in such a way that the second ferromagnetic body (22) has collar-like projections (23a, 23b), which are composed of ferromagnetic material of high permeability, above and below the magnet (25) in the longitudinal direction L of the coil (35). The first and second ferromagnetic bodies (22, 32) are each provided on that side of the coil (35) and, respectively, of the magnet (25) which is averted from the air gap (4). The magnet (25) is mounted in a static manner together with the second ferromagnetic body (22), and the coil (35) is mounted in a sprung manner together with the first ferromagnetic body (32) in such a way that the coil (35), together with the first ferromagnetic body (32), can oscillate in the longitudinal direction L when an alternating current is driven through the coil (35). The coil (35) is arranged outside the at least one magnet (25) perpendicular to the longitudinal axis L. |
