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Challenging the hydraulics on its own ground: Ship steering through unconventionally-high thrust permanent-magnet direct motors with structural redundancy and fault-tolerance

By C. Bruzzese and A. Tessarolo


The ships have long been an easy play-ground for hydraulic technologies. When high torques and low speeds are demanded on board ship, both technical and traditional reasons usually lead to hydraulic solutions. In fact, the conventional electrical machines are better suited for low-torque, high-speed applications, and coupling gears must be used to reduce the speed. However, oil-free direct-drive alternatives can be conceived, by new concepts of low-speed permanent-magnet actuators fed by low-frequency inverters. This paper shows the experimental results obtained with a linear permanent-magnet motor designed for direct coupling to rudder stocks or stabilizing fins. The prototype weights 700kg and features a thrust-to-weight ratio of 5. Even better results can be obtained by using composite materials for the machine frame. The machine features a full structural redundancy and inherent fault tolerance, thanks to the modular construction. The present research has been carried out in the framework of the Italian Defence's Research National Program

Topics: composite materials,fault tolerance,invertors,linear motors,permanent magnet motors,ships,steering systems,composite materials,fault tolerance,hydraulic technology,linear permanent magnet direct motors,low-frequency inverters,machine frame,mass 700 kg,permanent magnet actuators,ship steering,structural redundancy,Inverters,Marine vehicles,Prototypes,Redundancy,Stator windings,Valves,Direct drive,fault tolerance,full-electric drive,hydraulic drive,linear drive,low-speed high-force drive,permanent magnet,redundancy,ship,steering gear
Publisher: IEEE
Year: 2014
DOI identifier: 10.1109/ICELMACH.2014.6960513
OAI identifier: oai:arts.units.it:11368/2829475
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