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Title: Development of a 5 MW reference gearbox for offshore wind turbines: 5 MW reference gearbox

This paper presents detailed descriptions, modeling parameters and technical data of a 5MW high-speed gearbox developed for the National Renewable Energy Laboratory offshore 5MW baseline wind turbine. The main aim of this paper is to support the concept studies and research for large offshore wind turbines by providing a baseline gearbox model with detailed modeling parameters. This baseline gearbox follows the most conventional design types of those used in wind turbines. It is based on the four-point supports: two main bearings and two torque arms. The gearbox consists of three stages: two planetary and one parallel stage gears. The gear ratios among the stages are calculated in a way to obtain the minimum gearbox weight. The gearbox components are designed and selected based on the offshore wind turbine design codes and validated by comparison to the data available from large offshore wind turbine prototypes. All parameters required to establish the dynamic model of the gearbox are then provided. Moreover, a maintenance map indicating components with high to low probability of failure is shown. The 5 MW reference gearbox can be used as a baseline for research on wind turbine gearboxes and comparison studies. It can also be employed in globalmore » analysis tools to represent a more realistic model of a gearbox in a coupled analysis.« less
 [1] ;  [2] ;  [3] ;  [1]
  1. Norwegian Research Center for Offshore Wind Technology, Norwegian University of Science and Technology, Trondheim Norway; Center for Ships and Ocean Structures, Norwegian University of Science and Technology, Trondheim Norway
  2. National Wind Technology Center, National Renewable Energy Laboratory, Golden Colorado USA
  3. Center for Ships and Ocean Structures, Norwegian University of Science and Technology, Trondheim Norway
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1095-4244
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Wind Energy; Journal Volume: 19; Journal Issue: 6; Related Information: Wind Energy
Research Org:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
Country of Publication:
United States
17 WIND ENERGY; 42 ENGINEERING 5 MW reference gearbox; offshore wind turbines; high-speed wind turbine gearbox; wind turbine drivetrains; NREL