Permanent-magnet linear actuator for static and reciprocating short-stroke electromechanical systems

With the rapid progress in permanent-magnet technology, through the use of high-energy-density rare-earth materials a range of compact and high-performance linear actuators is now available. The paper presents simulated and experimental results from an investigation into the performance of such a device, in which the internal operating conditions are first modeled using a finite-element approach. Information obtained from this investigation is used, together with equations for both the electrical circuit and the mechanical motion, to enable both the static and the dynamic characteristics to be predicted. The most significant parameters affecting the performance of the actuator are identified, and an optimized design is produced