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Vensys Energy AG (VENSYS) is a company in the wind energy industry. The main business area is the development and construction of gearless wind turbines. Vensys is a licensor for several non-European manufacturers of wind turbines, and Vensys manufactures its own plants on a small scale at its headquarters in Neunkirchen (Saar). The Vensys Group includes Vensys Elektrotechnik GmbH in Diepholz, which manufactures the electrical components, and NEVEN Windenergie GmbH in Trier, which is active in project development. The Chinese Goldwind Windenergy GmbH, headquartered in Hamburg, has been the largest single shareholder of the company since 2008 with a 70% share.

History
The company Vensys was originally formed from the research group Wind Energy (FGW) founded in 1990 under the direction of Friedrich Klinger at the Saarland University of Technology and Economics. After successful research work, the first prototype "Genesys" with 600 kW went into operation in 1997. Vensys Energiesysteme GmbH & Co. KG was founded by members of the research group in 2000 as a spin-off of the Hochschule für Technik und Wirtschaft. The resulting engineering office focused on the further development of gearless technology. In 2003, the first prototype of the Vensys 62 with 1.2 MW was built. In the same year, the license partnership with the Chinese wind turbine manufacturer Goldwind began. As a result, Goldwind became the first company entitled to license Vensys wind turbines. The following year, the 1.5 MW system with extended rotor diameter was developed. In 2007, Vensys Energiesysteme GmbH & Co. KG changed its name to non-listed Vensys Energy AG. In the same year, licenses were granted to ReGen Powertech (India) and IMPSA Wind (Brazil). Goldwind GmbH joined in 2008 as a new co-shareholder, enabling further company growth and the establishment of its own production facility in Neunkirchen (Saar). In 2010, the first Vensys 100 with a capacity of 2.5 MW was put into operation. The last licensee to join in 2012 was A.O.I. (Egypt).

Technology
Vensys wind turbines have some special technical features compared to most other wind turbine manufacturers, which apply to all types of Vensys turbines. Characteristic is the gearless plant concept, which was pursued from the beginning. The rotational speed of the rotor corresponds to the rotational speed of the generator, so that a transmission which is potentially susceptible to malfunction and intensive in terms of maintenance can be dispensed with. Instead, a permanently excited synchronous generator is used, as a result of which, in comparison with externally excited generators, no excitation power is required and, at the same time, the tower head mass is saved. The generator is embodied as an external rotor, which has the advantage that no he