Experimental validation of load estimation method from the back-EMF for amplitude control method of linear resonant actuator

This paper proposes a feedback control method for a Linear Resonant Actuator (LRA), in which an external load estimated from two signals of the back-EMF is used as the target voltage in PID control. From the estimated load, it becomes possible to obtain an arbitrary amplitude of the mover. The effectiveness of this method was verified through FEM analysis and measurement.