With the rise of smart devices and AI, voice devices are becoming increasingly important. This study explores a sound-generating device using an SMA actuator with magnetic restoring force, aiming to reduce structural constraints compared to conventional spring-based systems. Experimental comparisons showed that the magnetic system achieved comparable maximum sound pressure and frequency response. However, issues such as reduced stability and performance degradation due to magnetic properties were observed.
TAKAOKA et al. (Wed,) studied this question.