SPONSORS OF GEARBOX V DD
DEVELOPMENT AND VALIDATION In order to track down optimization potentials – like gear ratios – as early as possible, equipment manufacturers work closely with Bosch Rexroth right from the development phase. The amount of effort invested here is considerable. The concept’s service life is examined using analyses at the system level, multibody simulations, and finite element methods. In addition, detailed calculations of the dynamic loads for individual transmission components provide the basis for optimized gearbox engineering. At every development step the prototypes are also subjected to
The overall impact of the transmission ratio becomes clear when making a direct comparison of investment costs for the conventional design and for the differential gearbox. The conventional concept, comprising a generator and gearbox with two planet sets, is limited to a step-up ratio of 40. Thus the generator shaft rotates 40 times as fast as the rotor blades in the wind turbine. In that configuration, 65 percent of the investment costs for the power train will be devoted to the gearing and 35 percent to the medium- speed generator. With the REDULUS GPV differential gearbox made by Rexroth, it is possible to achieve gear ratios of 60 in medium-speed rotation concepts. The generator then has to deal with less torque at the same rated output. When using the differential gearing, the generator costs can be significantly reduced when compared with other concepts for medium-speed operation, since the costs vary almost directly proportionally to the torque to be handled.
tests on highly modern gearbox test beds and have to pass extensive field testing. The results are used in further development of the products and thus can bring about a significant increase in quality and performance – for the gearbox in particular, but also for other components.
SUMMARY
The drive components have a great influence on the efficiency and reliability of drives and, in turn, on the profitability of offshore wind turbines. Drive train concepts designed to rotate at medium speeds unite the decisive advantages of both of the other solutions. Just as in the high-speed designs, the high efficiency at full load and the low materials costs are convincing. The high partial efficiency and the concept’s great reliability are comparable with direct drives. Employing the Rexroth differential gearbox can additionally lower electricity production costs. With its help, wind farm operators and equipment manufacturers are thoroughly equipped to deal with future developments.
Bosch Rexroth AG
www.boschrexroth.co.uk
Click to view more info
www.windenergynetwork.co.uk
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