The influence of mechanical spring on the dynamic performance of a moving-magnet linear actuator with cylindrical Halbach array

An influence of mechanical spring on the dynamic performance of a moving-magnet linear actuator with cylindrical Halbach array is described. On the basis of two dimensional (2-d) analytical solutions and experimental results, this paper estimates control parameters such as thrust constant, back-emf constant, inductance and resistance. And then, the voltage and the motion equation, which provide dynamic simulation algorithm, of a moving-magnet linear actuator are established. In particular, by expressing mechanical components as the motional impedance from the motion equation, this paper investigates not only the variation of the motional impedance according to system parameters but also the variation of power dissipated in the linear actuator with/without spring vs. frequency. Finally, the simulations and experiments for dynamic characteristics such as current and displacement of the moving-magnet linear actuator with/without spring are presented for various values of frequency.