Study on Torque Increase in Magnetic Drive Torque Actuator Using Superelastic Material and Ferromagnetic Material

To improve the performance of magnetic drive torque actuator that consists of a superelastic material and a ferromagnetic material, it is necessary to increase the operation torque, and to reduce the gradient of torque in a superelastic region. The structure of the composite material which consisted of soft iron and superelastic wires were examined by the FEM analysis. To increase the operation torque, the superelastic wires were arranged in two rows. As a result of the FEM analysis, the operation torque when the superelastic wires are arranged in two rows compared with the case arranged in a row has increased greatly. Furthermore, it became clear to be able to decrease a gradient of torque by increasing the number of superelastic wires of the inside row than an outside row. In addition, we carried out the analysis that the number of superelastic wires changed in the longer direction of the composite. In conclusion, the operation torque decreased by gradually increasing the number of superelastic wires from the revolving shaft side towards a peripheral side, but it became clear to be able to decrease a gradient of torque.