Improvement on characteristics of linear oscillatory actuator for artificial hearts

The authors discuss improvements to develop a simple structured, permanent magnet single-winding linear oscillatory actuator (LOA) for total implantable artificial heart actuators. Two methods for improving the starting thrust of the LOA are considered: one is improvement by structural analysis; another is improvement by the exciting current control. In the first method, the starting thrust could be improved by the authors´ investigations into the mover diameter, stator inductor shoe dimension and other factors. In the second, the current waveforms to obtain arbitrarily static thrust characteristics with respect to displacement were calculated