Investigation of Micro-Actuator with Magnetic Alloy Iron-Based Amorphous Plate for Loudspeaker
Tsung-Kun Lin, T. Meydan · 中國機械工程學刊 · 2007
The proposed model of micro-actuator within the audible frequency range has been developed small displacements for the miniature electromagnetic loudspeaker. Because of the coupling physical geometry effects by time varying currents and permanent magnet on the high conductivity and high permeability magnetic alloy iron-based amorphous plate, the electrical-magnetic energy will be transferred to mechanical energy, and will induce the longitudinal acoustic waveforms as motion diaphragm on amorphous plate in this model. Instead of the traditional piston motion to produce sound by the bending wave principle on amorphous plate, this micro-actuator will provide a potential solution to meet the miniaturization for the loudspeaker on flat panel speaker technology, and the magnetic characteristic distributions of magnetic field and magnetic flux density of the proposed model will be analyzed by 3D FEM model. Finally, the proposed model has been characterized using Laser Vibrometer measuring system to detect the magnitudes of displacements and velocity bending waves at octave bands.