Design Method of Microactuator With Magnetic Alloy Iron-Based Amorphous Plates for Loudspeaker

A novel design method of microactuator has been developed and results show that this transducer could produce sinusoidal wave displacements within the audible frequency range for the miniature electromagnetic loudspeaker. The proposed actuator has high conductivity and high permeability magnetic alloy iron-based amorphous plates as diaphragms. In this novel transducer speaker, the electromagnetic energy is transformed to mechanical pressure waves as a result of the coupling physical effects between time varying current on magnetic material and permanent magnet. The prototype actuator, based on the proposed model, has been characterized using the laser vibrometer measuring system to detect the amplitudes of displacement at all octave bands. This new miniature transducer speaker aims to provide a solution to the miniaturization of loudspeaker with flat panel speaker technology, which operates under the bending wave principle, and exploits the resonance of the panel instead of the traditional piston motion to produce sound