Enercon supplies a gearless technology e-33. The e-33 offers absolute freedom in terms of siting as well as unmatched flexibility as regards transport, assembly and maintenance as an ideal basis for combination with other regenerative sources of energy or storage systems. The prefabricated components of the steel tower, nacelle and rotor unit can easily be transported in containers and erected on site using a modular assembly system and a standard crane without any difficulty. Because of its modular construction it is easy to maintain. The systematic arrangement of the components makes repair work or inspections much simpler. E-33 technical specifications includes: rated capacity: 330 kw; rotor diameter: 33.4 m; hub height: 50 m. Rotor with pitch control is of type type : upwind rotor with active pitch control; direction of rotation : clockwise; number of blades : 3; length of blades : 14 m; swept area : 876 m²; blade material : fiberglass [reinforced epoxy] with integral lightning protection; rotor speed : variable, 18-45 rpm; tip speed : 25 - 75 m/s; pitch control : three synchronized blade pitch system with battery back-up. The generator: synchronous - type; hub: rigid; bearings: tapered roller bearings; grid feeding: ac - dc - ac through convertor - invertor; braking system: 3 independent aero brakes with emergency battery back up supply; yaw control: active through adjustment gears, friction damping; cut-in wind speed: 3 m/s; rated wind speed: 12 m/s; tower: steel tubular.
