Dynamic analysis of a bistable actuator for digital hydraulics

A fast and small electromagnetic actuator, which requires a small amount of work to switch between two stable positions, for the use in digital hydraulics, is presented. A dynamic study of the bistable actuator as part of a new kind of hydraulic on/off valve is carried out. A prototype is built and measured to verify the analysis. The results show that with careful elaboration the design is feasible. Furthermore, the response times depend on driving frequencies and an optimal current density for minimal energy consumption in cyclic action can be found. A single on/off valve is a critical part of a digital hydraulic system.