Wind Turbine Rotor-lock Systems by Optima

The hydraulic and electromechanical rotor-lock systems produced by Optima Spanntechnik GmbH have been developed to slow down and secure rotor blades during maintenance. Inspection and maintenance works on medium-sized and large wind power stations can thus be carried out safely and thoroughly.

Optima's systems are suitable for locking rotors of medium-sized and large wind power stations with a performance of up to 6 MW. The elements are available in a standard or an offshore version. The principle of locking rotors is relatively simple: depending on whether the hydraulic or the electromechanical system is used, a piston working as locking mechanism is pushed into the notch in the brake disc of the rotor by oil pressure or by an electric motor. In the hydraulic rotor-lock system HRV, a double-acting hydraulic cylinder moves the piston forwards and backwards. The check valves and the manually operated mechanical latches are additional options which serve as a second backup.

Optima Spanntechnik offers customers the HRV rotor locks with bolt diameters ranging from 120 mm (HRV 120-50) to 240 mm (HRV 240-80). Depending on the type, the components are designed for lateral forces of up to 4,000 KN. The final positions of the locking element are indicated by two mechanical feelers and can be visualized by means of the machine control. The HRV components resist corrosion and can be used in temperatures ranging from -30° C to +60° C.

The electromechanical rotor locks from the design series ERV are positioned by an electric motor. The advantage of this system is that is does without oil-carrying ducts. It is equipped with a self-locking feature and all functions can be monitored conveniently. In the standard version, the electromechanical rotor-lock system (ERV 240-80) is available with a bolt diameter of 240 mm and designed for lateral forces of up to 4,000 KN. As in the hydraulic system, two mechanical feelers operate the system. An inductive proximity switch indicates the predefined pressure that the piston exerts on the rotor disc.