An approach toward improving performance of moving coil type linear oscillatory actuator considering asymmetric magnetic circuit

This paper proposes an approach toward improving the performance of moving coil type linear oscillatory actuator (MC-LOA) with a core design and a simple controller. The approach is formulated on the analysis of an asymmetric magnetic circuit of MC-LOA by finite element method (FEM). Due to the asymmetric magnetic circuit, MC-LOA tends to have unbalanced thrust along current directions. In order to overcome this drawback, a saturation effect is applied to the core design, and the controller founded on thrust estimation with FEM is used for the input of MC-LOA. The propriety of this approach is verified by experimental results.