Solutions for Wind Energy
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System and Technology Expertise Solutions for Wind Energy

A strong partner for the wind industry Solutions for Wind Energy

As a strong partner for the wind industry, Liebherr offers the ideal solution for various requirements ranging from individual components used for turbines to excavators, concrete technology, mobile cranes, tower cranes and offshore cranes used not only to erect turbines but to construct entire wind farms. Liebherr works together with virtually all well-known turbine manufacturers and to date has supplied components for thousands of wind turbines. The product portfolio covers components for 800 kW installations up to solutions for multi-me awatt turbines g for offshore wind farms....

Wide product range Pitch systems • Well-engineered mechanical systems for rotor blade adjustment produced by Liebherr • Precise positioning of rotor blades for maximum energy yield Electric pitch systems Pitch system based on 3-4 stage planetary gearboxes with electric motor, which drives a geared slewing bearing Hydraulic pitch systems All-in-one solution based on hydraulic cylinders, hydraulic power unit, hydraulic manifolds, control system as well as accumulators and gearless slewing bearing for adjusting the rotor blade position. Solutions for Wind Energ

Yaw systems • Depending on the specific system design, comprising of up to twelve or more high-performance planetary gearboxes which drive a slewing bearing • Alignment and supply of entire system, including electric motors, by Liebherr • Various bearing and ring designs Frequency converter system • Liquid cooled full-scale converter • High power density • Completely closed converter cabinets • Maximum safety, durability and efficiency Main bearing • Moment bearings for 2MW turbines and upwards • Validated on internal test rig • Design types: Double-row tapered roller bearings or triple-row...

Slewing bearings • Diameter up to 9.5 m • Blade, yaw and main bearings for 2 MW turbines and upwards • Gear rings for yaw adjustment • Durable seals • Application-optimized raceway design Liebherr slewing bearings for wind turbines are used in rotor blade and yaw adjustment as well as in the main bearing of the rotor. Our solutions for these applications are diverse: Double-row four-point bearings, triple-row roller bearings, tapered roller bearings and geared rings. Liebherr is your development partner for all bearings. Through continuous development and expansion of our portfolio, we are...

Application expertise and diversity Bearing designs for wind turbines: Single-row and double-row four-point bearings for blade and yaw bearings Triple-row roller bearings for blade, yaw and main bearings Gear rings for yaw adjustment Double-row tapered roller bearing for main bearings Solutions for Wind Energy

Pitch bearings • Higher load capacity per diameter (increasing C, iso) • Lower turning resistance • Higher bearing stiffness • Weight and cost reduction The future of the blade bearing Wind turbines are growing steadily in an effort to attain higher energy yields. The options of adaptng i existing designs to the growing dimensions and more demanding load profiles are limited, however – particularly in regard to rotor blade bearings. Therefore, in addition to the current single-row and doublerow four-point bearings, Liebherr now also offers triple-row roller bearings for pitch systems. This...

Main bearings • Optimized regarding cost and function • Double-row tapered roller bearings • Triple-row roller bearings • Optimized sealing system for continuously turning bearings Main bearings by Liebherr Based on 30 years of experience in the wind sector, Liebherr offers main bearings for wind turbines ranging from 2MW and upwards. • Optimized sealing systems • Oil- and grease-lubricated version In-house main bearing test bench • Max. bending moment: 8,000 kNm • Max. radial force: 2,000 kNm

Planetary gearboxes • Extended oil change intervals • Certified HALT • Complete development support • Extensive application know-how Reliability and precise positioning are the crucial factors for the rotor blade and yaw adjustment drives. Liebherr offers multistage planetary gearboxes for the rotor blade adjustment. If required by the instal lation constrains, they can also be fitted with an angled increment. Three- to four-stage planetary gear boxes are usually used for yaw adjustment. Up to twelve or more yaw drives per yaw system are installed to transmit the high torques encountered in...

High power density under high dynamic loads Reliability and availability Yaw adjustment and pitch drives are based on tried-andtested technology. Their high reliability and availability are the result of a variety of intelligent design solutions, such as special sealing concepts, corrosion proection systems, as well t as optimised anti-friction bearings and gearing. High-quality design Liebherr planetary gearboxes boast a very high-quality de sign. For instance, the planetary supports are forged and the case-hardened output pinions have ground involute gearing. Meshing errors are also...

Frequency converter systems • Liduro Fast Protection Unit • Intelligent control • High-power module • Efficient liquid cooling Liebherr has developed the liquid-cooled Liduro power electronic modules especially for reliable operation, for harsh environmental conditions in onshore and offshore wind turbines. The power electronic modules are installed in completely closed cabinet units. Together with the coordinated additional components, they form an extremely reliable converter system and reveal a very wide performance range in the smallest footprint. The newly developed and unique Liduro...

Highest power density with small installation volume Efficiency and service life Selected components optimized for operation of the converter system achieve a very high efficiency at maximum power. The liquid cooling allows for very high performance at low power consumption per installation volume. Since there are no fans needed for cooling the converter cabinet, the converter systems are fully self contained, so they are almost maintenence free and low noise. Door fans and filter mats do not have to be changed, as is usually the case with air-cooled systems. This makes an operation, both,...