Electromagnetic Linear Actuator providing High Force Density per Unit Area without Position Sensor as a Tactile Cell

Abstract

A novel, very small linear actuator that can realize high force density per cross section without position and force sensors is proposed. This actuator is used in a two-dimensional tactile display, which consists of many small one-dimensional actuators with position and force controllability. The proposed actuator has 3 layer stators, and can achieve a high electro-magnetic force. As a result, a force density of 4mN/mm² is obtained with a cross section of 4mm × 4mm and a moving stroke of 1mm.