advanced bearing solutions for wind turbine generators...• grease life and the increase with...
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Advanced Bearing Solutions for Wind Turbine Generators
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© SKF Group Slide 2
Bearing arrangements for WTG
Traditional arrangement Locating bearing: DGBB
Non-locating bearing: DGBB
• Typical arrangement up to 3MW
• Bearing sizes: 6326 up to 6338
• Only grease lubrication
Arrangement for bigger powers Locating bearing: DGBB+CRB
Non-locating bearing: CRB
• Typical arrangement > 3MW
• Bearing cross sections:
62.. and 60.. in C4
NU10.. and NU 2.. in CN or C3
• Only grease lubrication
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© SKF Group
Two different solutions from bearings point of view
INSOCOAT bearings Hybrid bearings
Ceramic insulation layer
Silicon nitride
(ceramic) rolling
elements
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© SKF Group
INSOCOAT bearings
High performance SKF INSOCOAT
Ceramic insulation layer
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© SKF Group
• Bearing insulation with ceramic layer material
• Fully interchangeable with existing bearings
• Available for all kinds of bearings up to 1200mm OD
• Different layer thicknesses possible
• For generator bearings IR coating with increased layer
thickness P/Ns end in VL2076
• Easy and economical solution to reduce problems in
existing generators
WTG Bearings- SKF solutions
Slide 5
New since April 2017:
High performance SKF INSOCOAT bearings
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© SKF Group
SKF INSOCOAT bearings are well established on the market since years
• Industries: Railway, Renewable, Ind. Electrical, etc.
Increasing requirements on the electrical performance of the bearings in
specific applications
• Worldwide presence including regions with highly humid climate
Therefore the requirements on insulating coatings increased in that
environment
As a consequence, SKF has upgraded the INSOCOAT bearings to ensure
high performance even in countries with very humid climates.
Background of recent coating upgrade
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© SKF Group
Performance in humid environment
The graph shows measurement data of Ohmic resistance values
from INSOCOAT bearings continuously exposed to very high
humidity levels (rH > 90%, T between 20 and 30 °C) for three weeks.
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© SKF Group
Specification Breakdown voltage [VDC] Min. Ohmic resistance [MΩ]
OR coating Existing New Existing New
VL0241 1.000 V 3.000 V 50 MΩ 200 MΩ
VL0246 3.000 V Unchanged * 200 MΩ 400 MΩ
IR coating Existing New Existing New
VL2071 1.000 V 3.000 V 50 MΩ 200 MΩ
VL2076 3.000 V Unchanged * 200 MΩ 400 MΩ
New electrical specifications
Valid for: T < 40 °C, rH < 60 %
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© SKF Group
The solution for high demanding applications
17-09-21 Slide 9
Hybrid bearings
Silicon nitride
(ceramic) rolling
elements Bearing grade steel
rings
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© SKF Group
Rolling elements made of ceramic material
Balls For any ball bearings
Rollers For any cylindrical roller bearings
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© SKF Group
• Bearing insulation with ceramic rolling elements (Si3N4)
• Fully interchangeable with existing bearings
• Less sensitive to contamination and also in stand still
periods
• At least doubled grease life and superior performance
under poor lubrication
Improves most of the typical bearing issues in wind
turbine generators (false brinelling, grease life,
smearing, cage forces..)
WTG Bearings- SKF solutions
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© SKF Group
Advantages of ceramic rolling elements:
• Wettability of oil on ceramic is better than on steel
• Smaller contact ellipse due to higher stiffness of ceramic
• Better surface quality of ceramic Less friction
• Electrically insulating
17-09-21 Slide 12
Extended grease life of hybrid bearings
Extension of grease life by factor ≥ 2
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© SKF Group
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All steel Hybrid - Grease A Hybrid - Grease B Hybrid - Grease C
Rela
tive g
rease
life p
erf
orm
ance
Grease life comparison – Steel vs. Hybrid DGBBs
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© SKF Group
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All steel Hybrid - Grease A Hybrid - Grease B Hybrid - Grease C
Rela
tive g
rease
life
perf
orm
ance
Grease life comparison – Steel vs. Hybrid CRBs
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© SKF Group
Conclusion of tests:
• The grease life of hybrid bearings is at least double the grease life of the equivalent all-
steel bearing
• Grease life improvements up to a factor of 7 have been recognized
• Grease life and the increase with hybrid bearing is dependent on the grease selection and
bearing type
Grease life of hybrid bearings
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