Study on Disturbance Response of a Magnetic Lead Screw Actuator

This paper presents the disturbance response of a magnetic lead screw actuator (MLSA) composed of a magnetic lead screw and a rotary motor, generating linear motion. The MLSA has elasticity due to magnetic spring properties, and it can respond flexibly against disturbances. Since the implemented magnetic lead screw has a spiral structure composed of arc shape permanent magnets and soft iron teeth instead of a spiral shape permanent magnet, it has the advantage that the number of parts is small and easy to assemble. In the experiment, the MLSA and a ball screw actuator are applied a forced oscillation by a load actuator. Each actuator is controlled to maintain the contact force to zero. The root mean squared error of the MLSA is smaller than that of the ball screw actuator. As a result, it is shown that the MLSA has a superior response to disturbances.