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This article discusses the state of the art for driving technologies of anchor handling winches for offshore operations. These systems are necessary for anchor handling operations associated with installation of many types of moored floating offshore structures. To perform these operations, it is necessary to use specialized vessels known as AHT (Anchor Handling Tug) or AHTS (Anchor Handling Tug Supply) vessel, which incorporate specific equipment such as towing winches, but with higher performance than conventional tugs both in size and in technical performance. There are nowadays two main options for driving the Anchor Handling/Towing winches: hydraulic with low or high pressure motors, and electrical with AC motors driven by Variable Frequency Drives. Additionally, a new technology is appearing in the industrial sector which is starting to be applied in the marine sector, and in some cases for anchor handing winches: the permanent magnet motor. The aim of this paper is to discuss these driving technologies and their importance in the future of this part of the marine sector. [ABSTRACT FROM AUTHOR]

The VLFS (Very Large Floating Structures) are the floating structures that respond to the needs of real state development at sea, mainly for the creation of floating harbors and airports, both in the coast and in the open ocean. Due to the greater space requirements than in the nowadays floating structures (pontoons, barges, ships, offshore platforms) it is still a technology in experimental stage. Several designs have been proposed, according to the depth and the proximity to the coast. The increase in costs of real state at land and in the sensibility for the protection of the coastal areas, will have a main impact in the development of these structures in the XXI century. [ABSTRACT FROM AUTHOR]