Development of a Dual-Spring Linear Resonant Actuator for Improved Haptic Performance

This study proposes a novel dual-spring linear resonant actuator (LRA) designed to enhance haptic feedback in tactile devices, particularly haptic controllers. The design aims to improve acceleration performance compared with the one-spring existing prototype. The new type allows for larger magnets and moving mass within the same size constraints. Both the prototype and new type were analyzed using an electromagnetic-mechanical coupled model to evaluate their acceleration and displacement. The new type shows a 0.32 mm decrease in maximum displacement and a 0.58 G increase in maximum acceleration on dummy jig at the same input voltage, compared with the prototype. To validate the analysis results, a sample of the new type is fabricated and tested using a vibration analyzer and Klippel equipment. The experimental results confirm the improved haptic performance of the dual-spring structure, thus demonstrating its potential to provide superior haptic feedback with stronger vibration.