Optimal design methodology to improve electro-dynamic characteristics of linear vibrators in mobile phones

Mobile phones have become necessary communication devices in modern society. Linear vibrators excited with a vertical vibration at resonant frequency produce a silent, tactile signal and, compared with vibration motors, have excellent performance due to their simple structure. This paper introduces an optimal design methodology for linear vibrators through electromagnetic and mechanical coupling analysis using the finite elements method and numerical analysis. Based on experimental results, it is shown that the optimal design produces equivalent performance with respect to acceleration value in terms of electromagnetic and vibration ion.