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Linear resonant actuators (LRAs) have been used in a wide range of applications [1] because they can reciprocate in a comparatively short stroke in spite of their compact size and light weight.
Linear resonant actuators (LRAs) have been used in a wide range of applications [1] because they can reciprocate in a comparatively short stroke in spite of their compact size and light weight. However, the amplitude of LRAs severely decreases when external loads are applied. With applications such as electric shaver or air compressors, the amplitude of the mover needs to be able to be arbitrary controlled...
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 a target voltage in PID control. The effectiveness of this method was verified through the FEM analysis in which the magnetic field equation is coupled with electric circuit equation, control method, and motion equation. As a result, it...
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