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Title: Gearbox high-speed-stage bearing slip induced by electric excitation in a test facility

Abstract

The goal of this paper is to investigate the behaviour of the high-speed stage of a wind turbine gearbox during transient grid-loss events triggered at different power levels in a full-scale nacelle dynamometer test. The gear mesh behaviour and the bearing roller slip during these events are characterized by strain measurements placed in the gear teeth roots and embedded in the outer rings of the tapered roller bearing locating pair. From our experiments, we conclude that the high-speed stage experiences a multidimensional loading consisting of bending and torsional deformation during the transient event. This loading propagates throughout the gearbox and results in unfavourable loading conditions at the bearing that have the potential to go beyond the preload during the torque reversals that occur during the grid-loss event. During the torque reversal, roller slip can occur in the bearings. It is observed that the slip behaviour is directly linked to the initial power level of the generator. Electrically induced excitation that typically leads to dynamic torque events can therefore cause mechanical gearbox degradation.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Vrije Univ. Brussel (VUB), Brussels (Belgium)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1465648
Alternate Identifier(s):
OSTI ID: 1460904
Report Number(s):
NREL/JA-5000-70713
Journal ID: ISSN 1095-4244
Grant/Contract Number:  
AC36-08GO28308; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Wind Energy
Additional Journal Information:
Journal Volume: 21; Journal Issue: 11; Journal ID: ISSN 1095-4244
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; 42 ENGINEERING; wind energy; bearing; slip; dynamics; high-speed-stage; electric excitation

Citation Formats

Helsen, Jan, Guo, Y., and Keller, J. Gearbox high-speed-stage bearing slip induced by electric excitation in a test facility. United States: N. p., 2018. Web. doi:10.1002/we.2223.
Helsen, Jan, Guo, Y., & Keller, J. Gearbox high-speed-stage bearing slip induced by electric excitation in a test facility. United States. doi:10.1002/we.2223.
Helsen, Jan, Guo, Y., and Keller, J. Thu . "Gearbox high-speed-stage bearing slip induced by electric excitation in a test facility". United States. doi:10.1002/we.2223. https://www.osti.gov/servlets/purl/1465648.
@article{osti_1465648,
title = {Gearbox high-speed-stage bearing slip induced by electric excitation in a test facility},
author = {Helsen, Jan and Guo, Y. and Keller, J.},
abstractNote = {The goal of this paper is to investigate the behaviour of the high-speed stage of a wind turbine gearbox during transient grid-loss events triggered at different power levels in a full-scale nacelle dynamometer test. The gear mesh behaviour and the bearing roller slip during these events are characterized by strain measurements placed in the gear teeth roots and embedded in the outer rings of the tapered roller bearing locating pair. From our experiments, we conclude that the high-speed stage experiences a multidimensional loading consisting of bending and torsional deformation during the transient event. This loading propagates throughout the gearbox and results in unfavourable loading conditions at the bearing that have the potential to go beyond the preload during the torque reversals that occur during the grid-loss event. During the torque reversal, roller slip can occur in the bearings. It is observed that the slip behaviour is directly linked to the initial power level of the generator. Electrically induced excitation that typically leads to dynamic torque events can therefore cause mechanical gearbox degradation.},
doi = {10.1002/we.2223},
journal = {Wind Energy},
number = 11,
volume = 21,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 2 works
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Figures / Tables:

Figure 1 Figure 1: Active power produced versus main shaft torque during the grid-loss event for different initial loading conditions

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Works referenced in this record:

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