Generators supply electric power to wind turbines under demanding operational conditions. ELIN Motoren manufactures specially engineered generators that achieve high availability and extended service life while withstanding wind loads, environmental stress, and dynamic mechanical forces. Our solutions serve wind installations that contribute to global renewable capacity exceeding 1,000 GW according to the Global Wind Energy Council (GWEC).
Requirements for wind turbine generators
Environmental and operational stresses
Vibration Management
Wind-induced turbulence and rotor dynamics create variable mechanical loads on generator bearings and structural components. Generators from ELIN Motoren incorporate reinforced bearing arrangements and dynamically balanced rotors that withstand these cyclic loads for up to 30 years operational lifetimes. Proper rotor balancing to ISO 21940-11 quality grade G2.5 minimizes vibration transmission to tower structures.
Platform design approach
Modular construction philosophy
ELIN Motoren employs platform-based design principles that standardize core generator architectures across multiple power ratings. This modular construction approach reduces overhead for preparing detailed designs and stocking parts across various sizes and ratings, while bringing benefits through simplified assembly and repair procedures.
What platform design means
A generator platform consists of standardized mechanical interfaces, electromagnetic design principles, and manufacturing processes that scale across a power rating family. For example, a 3 MW generator platform shares bearing arrangements, cooling architecture, and control interfaces with 4 MW and 5 MW variants within the same family.
How it works
Core components like stator frames, rotor hubs, and bearing housings maintain consistent mounting dimensions and connection points. Variable elements—including winding configurations, rotor diameter, and stack length—adjust to meet specific power requirements while preserving interface compatibility.
Results for OEMs and operators
Platform standardization reduces spare parts inventory compared to fully custom designs. Maintenance technicians require training on fewer generator variants, reducing knowledge transfer costs. Modular designs increase generator availability by reducing downtimes, especially valuable for installations where access is challenging.
Scalability advantages
Power rating flexibility
ELIN Motoren platforms accommodate power variations through winding modifications without changing mechanical structures. A wind farm operator can specify 4.5 MW units for high-wind sites and 3.8 MW units for moderate-wind locations while maintaining identical maintenance procedures and spare parts inventories.
Turbine OEM integration
Standardized mounting interfaces enable multiple turbine manufacturers to integrate ELIN Motoren generators with minimal nacelle redesign. Bolt pattern standardization, shaft coupling dimensions, and electrical termination locations follow industry conventions, reducing engineering hours during turbine development.
Production efficiency
Platform manufacturing utilizes common tooling, fixtures, and test equipment across power ratings. This commonality reduces capital investment for production scaling and enables faster delivery times when order volumes fluctuate—critical factors during wind energy market expansion periods.
Component Interchangeability
Segmented active parts enable modular production and maintenance directly in the nacelle, significantly reducing maintenance costs and downtime. Interchangeability is particularly advantageous in retrofit projects and includes interchangeable bearing systems within adjacent power classes (e.g., 3–5 MW family with identical bearing types), modular winding segments for partial rewinding without complete stator removal, and standardized cooling system components such as fans and heat exchangers.
Technologies and construction
Generator types and excitation systems
ELIN Motoren designs and manufactures main generators ranging from 2 MW up to 8 MW that convert mechanical rotational energy from turbine rotors into electrical power. These generators integrate seamlessly with geared configurations, providing three-phase AC output at voltage levels starting from 690V and higher depending on turbine capacity and grid connection requirements.
Cooling system design
ELIN Motoren wind generators utilize air-to-air or air-to-water cooling circuits optimized for generator power class. Closed-loop cooling with heat exchangers reduces thermal stress on windings, extending insulation lifespan compared to direct air-cooled designs. External cooling systems maintain optimal operating temperatures across variable ambient conditions.
Environmental protection and materials
Corrosion-resistant coatings provide protection in humid and chemically aggressive environments. Multi-layer coating systems fulfills salt spray resistance per ISO 9227 testing. Climate class H ratings ensure reliable operation in extreme temperature and humidity conditions. IP55 to IP65 protection ratings prevent dust and moisture ingress into electrical compartments.
Mechanical integration
Ball and roller bearings accommodate shaft misalignment from tower deflection and thermal expansion. The housing is designed to distribute all forces and torques coming from the drivetrain and the generator to the foundation below. ELIN Motoren designs generator mounting interfaces to match standard turbine nacelle configurations, facilitating installation and maintenance procedures.
Doubly-Fed Induction Generators (DFIG):
offer proven performance in variable-speed applications with established maintenance procedures and cost-effective power electronics
Squirrel-Cage Induction Generators (SCIG):
are robust, low-cost AC generators, requiring a gearbox and grid-side converters for stable, efficient power output, making it reliable, simple, and suitable for wide speed ranges and harsh conditions. It’s simple rotor design offers durability, low maintenance, and adaptability, though it needs power electronics to control reactive power and interface with the grid.
Mid-speed Generators with permanent magnet technology (MS PMG):
use a medium-speed gearbox to achieve high efficiency. They offer a compact design, reduced mechanical loads and require a full-scale power converter to control speed, power, and grid.
ELIN Motoren develops and manufactures customized generators and generator single components (stators / rotors) for your specific requirements!
