Variation of Extreme and Fatigue Design Loads on the Main Bearing of a Front Mounted Direct Drive System

Asger Bech Abrahamsen; Anand Natarajan

doi:10.1088/1742-6596/753/11/112006

Variation of Extreme and Fatigue Design Loads on the Main Bearing of a Front Mounted Direct Drive System

Asger Bech Abrahamsen
, Anand Natarajan

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Abstract

The drivetrain of a 10 MW wind turbine has been designed as a direct drive transmission with a superconducting generator mounted in front of the hub and connected to the main frame through a King-pin stiff assembly by DNV-GL. The aeroelastic design loads of such an arrangement are evaluated based on the thrust and bending moments at the main bearing, both for ultimate design and in fatigue. It is found that the initial superconductor generator weight of 363 tons must be reduced by 25% in order not to result in higher extreme loads on main and yaw bearing than the reference10 MW geared reference drive train. A
weight reduction of 50% is needed in order to maintain main bearing fatigue damage equivalent to the reference drive train. Thus a target mass of front mounted superconducting direct drive generators is found to be between 183-272 tons.

Original language	English
Article number	112006
Book series	Journal of Physics: Conference Series (Online)
Volume	753
Number of pages	10
ISSN	1742-6596
DOIs	https://doi.org/10.1088/1742-6596/753/11/112006
Publication status	Published - 2016
Event	The Science of Making Torque from Wind 2016 - Technische Universität München (TUM), Munich, Germany Duration: 5 Oct 2016 → 7 Oct 2016 Conference number: 6 https://www.events.tum.de/?sub=29

Conference

Conference	The Science of Making Torque from Wind 2016
Number	6
Location	Technische Universität München (TUM)
Country/Territory	Germany
City	Munich
Period	05/10/2016 → 07/10/2016
Internet address	https://www.events.tum.de/?sub=29

Bibliographical note

Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd

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title = "Variation of Extreme and Fatigue Design Loads on the Main Bearing of a Front Mounted Direct Drive System",

abstract = "The drivetrain of a 10 MW wind turbine has been designed as a direct drive transmission with a superconducting generator mounted in front of the hub and connected to the main frame through a King-pin stiff assembly by DNV-GL. The aeroelastic design loads of such an arrangement are evaluated based on the thrust and bending moments at the main bearing, both for ultimate design and in fatigue. It is found that the initial superconductor generator weight of 363 tons must be reduced by 25\% in order not to result in higher extreme loads on main and yaw bearing than the reference10 MW geared reference drive train. A weight reduction of 50\% is needed in order to maintain main bearing fatigue damage equivalent to the reference drive train. Thus a target mass of front mounted superconducting direct drive generators is found to be between 183-272 tons. ",

author = "Abrahamsen, \{Asger Bech\} and Anand Natarajan",

note = "Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd; The Science of Making Torque from Wind 2016, TORQUE 2016 ; Conference date: 05-10-2016 Through 07-10-2016",

year = "2016",

doi = "10.1088/1742-6596/753/11/112006",

language = "English",

volume = "753",

journal = "Journal of Physics: Conference Series (Online)",

issn = "1742-6596",

publisher = "IOP Publishing",

url = "https://www.events.tum.de/?sub=29",

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T1 - Variation of Extreme and Fatigue Design Loads on the Main Bearing of a Front Mounted Direct Drive System

AU - Abrahamsen, Asger Bech

AU - Natarajan, Anand

N1 - Conference code: 6

PY - 2016

Y1 - 2016

N2 - The drivetrain of a 10 MW wind turbine has been designed as a direct drive transmission with a superconducting generator mounted in front of the hub and connected to the main frame through a King-pin stiff assembly by DNV-GL. The aeroelastic design loads of such an arrangement are evaluated based on the thrust and bending moments at the main bearing, both for ultimate design and in fatigue. It is found that the initial superconductor generator weight of 363 tons must be reduced by 25% in order not to result in higher extreme loads on main and yaw bearing than the reference10 MW geared reference drive train. A weight reduction of 50% is needed in order to maintain main bearing fatigue damage equivalent to the reference drive train. Thus a target mass of front mounted superconducting direct drive generators is found to be between 183-272 tons.

AB - The drivetrain of a 10 MW wind turbine has been designed as a direct drive transmission with a superconducting generator mounted in front of the hub and connected to the main frame through a King-pin stiff assembly by DNV-GL. The aeroelastic design loads of such an arrangement are evaluated based on the thrust and bending moments at the main bearing, both for ultimate design and in fatigue. It is found that the initial superconductor generator weight of 363 tons must be reduced by 25% in order not to result in higher extreme loads on main and yaw bearing than the reference10 MW geared reference drive train. A weight reduction of 50% is needed in order to maintain main bearing fatigue damage equivalent to the reference drive train. Thus a target mass of front mounted superconducting direct drive generators is found to be between 183-272 tons.

U2 - 10.1088/1742-6596/753/11/112006

DO - 10.1088/1742-6596/753/11/112006

M3 - Conference article

SN - 1742-6596

VL - 753

JO - Journal of Physics: Conference Series (Online)

JF - Journal of Physics: Conference Series (Online)

M1 - 112006

T2 - The Science of Making Torque from Wind 2016

Y2 - 5 October 2016 through 7 October 2016

ER -

Variation of Extreme and Fatigue Design Loads on the Main Bearing of a Front Mounted Direct Drive System

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