Development of Linear Oscillatory Actuator with 4-poles and 8-poles Movers

Recently, inertia force generators with linear oscillatory actuators have been reported to reduce undesirable vibrations in automobiles and precision devices. In the IFG, a conventional actuator could effectively generate the inertia force for narrow frequency range because it has only one mover. The aim of this study is to widen the frequency range. Accordingly, we proposed a novel linear oscillatory actuator with 4-poles and 8-poles movers for inertia force generators. An even-even pole combination could significantly reduce the undesirable attractive force between the movers, through simple theoretical analysis, static electromagnetic analysis using finite element method, and measurements on a prototype. Moreover, the proposed LOA could effectively generate the inertia force at two different frequency ranges by switching the phase of the current, through dynamic analysis and measurements.