Electrohydraulic Control-based Improvement of a Marine Forward-drive Oil Servomotor

To overcome the shortcomings of the original forward-drive oil servomotors,such as slow response speed and easy seizure of the electrohydraulic conversion portion,a comprehensive evaluation method was employed to perform a type selection of electrohydraulic converters,focusing on reliability and maintainability etc.An electrohydraulic control-based improvement scheme was finalized by using a sourceless self-capacitance type electrohydraulic actuator ReXA,which has a large output power and strong anti-seizure capacity.Being fully enclosed and capable of avoiding erosion of equipment internals by salt mist in the engine room,it is suited for use on board vessels.After the improvement,the transition duration of the forward-drive oil servomotor is shortened from the original 40 seconds to 18.2 seconds and even to a minimum of 3.3 seconds depending on specific needs.