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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...
In this paper, we propose a new electromagnetic spherical actuator capable of a three-degree-of-freedom rotation. The basic structure and the operating principle of the actuator are described, and a position feedback system for the actuator using optical image sensors is proposed. Through the comparison with the measurement of a prototype, the validity of this method is verified.
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