| 摘要 |
A vibration exciter adapted for location in a cavity in a member to be vibrated. A motor coil assembly (6) has a coil rigidly fixed to a tubular member, the motor coil assembly having an outer peripheral face, and a magnet assembly (3-5) is disposed concentrically of the motor coil assembly and arranged for axial movement relative thereto. The magnet assembly has opposed generally disc-like pole pieces (4, 5), the periphery of one of which is disposed within and adjacent to the motor coil assembly, and the periphery of the other (5) of which pole pieces is formed with a flange (8) arranged to lie adjacent to and to surround the motor coil assembly. The flange has aperture portions (11) through which the outer peripheral face of motor coil assembly is adapted to be fixed directly to the cavity wall in the member to be vibrated.
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