Development of miniaturized 2-DOF electromagnetic actuator module

The proposed two degree-of-freedom electromagnetic oscillatory actuator has a novel structure to combine two electromagnetic actuators of the moving-coil type. In order to rotate the actuator, the coil is attached to the moving frame, acting as the moving-coil type. There is three magnets, in the middle and inside each moving frame. The direction of the magnetism is perpendicular to the coil in order to change the direction of current induced to the coil and oscillate the moving frame. There are two types of forces applied to the 2-DoF electromagnetic oscillatory actuator. The magnetic force between the magnets holds the moving frame on the left or right side. That magnetic force is called as a holding force. The electromagnetic force generates the oscillatory motion when the current is applied to the coil. The overall size is 15 mm (W) × 15 mm (D) × 50 mm (H). All frames are made of ABS plastic using a rapid prototyping process to reduce inertia. The magnet material is ND35. The dynamic modeling and electromagnetic simulations and experiments are conducted. Resonance frequency is 18.5 Hz with only moving parts and 15.5 Hz including middle magnet. The laser beam profile shows 2-D motion for swing motion for various applications. © ICROS 2017.