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Locking the turbine shaft in the braked position

06 October 2010

When maintenance works or repairs have to be carried out on a wind turbine installation, the shaft not only has to be slowed down, it has also to be secured. And this is where the hydraulic and electromechanical rotor-lock systems manufactured by Optima Spanntechnik come in handy.

Optima's systems are suitable for locking rotors of medium and large-size onshore or offshore wind power turbines of up to 6MW capacity.

Depending on whether a hydraulic or electromechanical braking system is used, the rotor-lock piston is engaged with a notch in the brake disc under hydraulic or electric actuation. In Optima’s HRV hydraulic rotor-lock system, a double-acting hydraulic cylinder moves the piston forwards and backwards, with optional check valves and manually operated mechanical latches providing additional security. Bolt diameters range from 120mm to 240mm and lateral forces of up to 4,000kN can be contained.

Optima’s ERV electromechanical rotor locks are electrically operated and are thus independent of separate hydraulic actuation circuits. The ERV is equipped with a self-locking feature and is available with a bolt diameter of 240 mm. As with the hydraulic version, lateral forces of up to 4,000kN can be contained by this system.

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