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MDA Technologies 2/2014

MDA Technologies 2/2014

Rubrizierungsebene I 2.

Rubrizierungsebene I 2. Ebene Rexroth technology in action: Let there be light in Norway This winter, the residents of the Norwegian town of Rjukan will see sunlight in the winter months for the first time. As of this year, three large movable mirrors on the opposite slope have been lighting up the central marketplace with reflected sunlight. The drive and control solution for the adjustment mechanism as well as the remote monitor have been supplied by Bosch Rexroth. The city of Rjukanwith its approximately 3,500 residents came into being in 1913 in Norway as Vermork, the largest hydroelectric power station in the world at the time, was constructed about 180 kilometers west of Oslo. The biggest challenge at the time was to provide as much protection as possible from the harsh mountain climate. In doing so, the city‘s founders accepted the fact that no sunlight would reach it over the entire winter season. In time for the city’s 100th anniversary, the central square will now be illuminated in the dark season by sunlight for the first time. For this purpose, the Solar Tower Systems (STS) GmbH, Starnberg, constructed three movable mirrors on the mountain slope, about 500 feet above the city. Each of the 17 square meter, 500 kilogram heliostats follow the sun‘s path via computer control. A Rexroth control unit calculates the position of the sun and provides the optimum angle of the heliostats. Electric linear drives move the mirrors with a high degree of precision throughout the day in the appropriate position so that the sun rays illuminate the given area. The biggest challenge in this process is the harsh climate. In the mountains, there is often a wind force of 12, and gale-force winds of more than 140 kilometers per hour tug at the mirrors. The drives have to hold them in position reliably, even under these conditions. Right next to the mirrors, the control unit and two webcams are housed securely in a small cabin. The autonomous power supply of the entire system occurs in a decentralized manner through solar panels, a small wind turbine and high-performance batteries in which the electricity is temporarily stored. Wind and temperature measurements ensure that the heliostats automatically move into a protective position in poor weather conditions. The system on the mountain is linked via a wireless connection to a computer at City Hall. STS Starnberg and Bosch Rexroth of Lohr am Main can access this computer over the Internet for maintenance purposes and read all the necessary data of the control and drive system. The system manufacturer Solar Tower Systems (STS) is an innovative company for the construction of solar power plants with movable mirrors. www.boschrexroth.com About Company name: Bosch Rexroth Headquarters: Lohr, Germany Turnover: 52.5 bn € Employees: approx. 306.000 worldwide Products: Drive Technology, Electric Drives and Controls, Gear Technology, Industrial and Mobile Hydraulics, Pneumatics, Assembly Technology, Linear Motion Technology 44 MDA Technologies 2/2014

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