2018 Volume 7 Issue 2 Pages 175-180
Linear resonant actuators (LRAs) have been used in a wide range of applications because they utilize mechanical resonance and operate at high efficiency. However, the amplitude of LRAs severely decreases when external load is applied. To solve this problem, we applied PID (Proportional-Integral-Derivative) control to an LRA, and the mover amplitude remained constant against an external load. When a large external load was applied with the target voltage of PID control high, however, input power reached maximum and the amplitude did not follow the target value. As a solution, it is effective to utilize electrical resonance and generate large current. In this paper, we propose a control method to generate an electrical resonance. The effectiveness of the proposed method was verified through dynamic characteristic analysis employing two-dimensional finite element method and measurements.
