Modelling dynamic behaviour of dot-matrix printer heads

The dynamic behaviour of nonballistic impact printer heads by means of numerical simulations is predicted. The model is based on a dynamic electromagneto-mechanical finite-element approach, able to include eddy-current effects in bulk and laminated ferromagnetic cores. Experimental analysis validates the simulation results. The numerical investigation focuses on the analysis of the main phenomena that influence the dynamic performance of the device, that is the characteristics of the materials, the drive circuit, and geometry of the device. The analysis has shown the important role of eddy currents and drive circuit characteristics on the dynamic performance of the device, and the usefulness of the proposed approach to define an optimised geometry of the device.