【摘要】 针对现有电磁式和压电式骨传导振子技术方案凸显的能量损耗大、发声强度不足和响应频带窄等问题，设计了一款采用稀土超磁致伸缩材料(GMM)的骨传导振子。研究依据现有骨传导振子性能参数指标，参考稀土磁致伸缩换能器技术方案，创新性地设计稀土超磁致伸缩骨传导微型振子，设计计算GMM棒的几何参数，求解绘制该GMM棒磁致伸缩曲线，优化匹配最佳的偏置磁场和预应力施加方案；以磁场均匀性、电磁转换效率和磁场强度为设计原则，实现对激励线圈的优化设计，创新设计了一款稀土超磁致伸缩骨传导微型振子。测试结果表明：单振子的最大输出力和最大输出位移达到当前主流压电振子的性能指标，设计的激励线圈模组尺寸为?5.5 mm×7.14 mm, GMM振子总体轮廓尺寸小至?17 mm×19 mm,符合骨传导振子微型化设计需求。更多还原

【Abstract】 Since the technical scheme of the electromagnetic and piezoelectric bone-conduction vibrators suffers large energy loss, insufficient sound intensity and narrow response frequency band, in this article efforts are made to design a rare-earth giant magnetostrictive material(GMM) bone-conduction vibrator, According to the current bone-conduction vibrator’s performance parameter indexes and the technical scheme of the rare-earth magnetostrictive transducer, the rare-earth giant magnetostrictive bone-conduction micro vibrator is subject to innovative design. The GMM rod’s geometric parameters are designed and calculated its magnetostrictive curve is solved and drawn; the schemes of the best bias magnetic field and the prestress application are optimized and matched. Based on the design principles of magnetic-field uniformity, electromagnetic conversion efficiency and magnetic-field strength, the excitation coil is design in a proper manner. The results show that the single vibrator’s maximum output force and displacement reach the performance indexes of the current mainstream piezoelectric vibrator, and the size of the excitation coil module is ?5.5 mm×7.14 mm; besides, the GMM vibrator’s overall outline is as small as ?17 mm×19 mm, thus meet the bone-conduction vibrator’s design requirement of miniaturization.更多还原