Power conversion system for a modular, direct-drive, permanent-magnet wind turbine generator

1997 ◽  
Author(s):  
Z. Chen
Keyword(s):  
Wind Turbine ◽  
Permanent Magnet ◽  
Power Conversion ◽  
Direct Drive ◽  
Turbine Generator ◽  
Wind Turbine Generator ◽  
Conversion System

scholarly journals Fabrication of a Scaled MgB2 Racetrack Demonstrator Pole for a 10-MW Direct-Drive Wind Turbine Generator

2018 ◽  
Vol 28 (4) ◽  
pp. 1-5 ◽  
Author(s):  
Niklas Magnusson ◽  
Jan Christian Eliassen ◽  
Asger Bech Abrahamsen ◽  
Svein Magne Helleso ◽  
Magne Runde ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Direct Drive ◽  
Turbine Generator ◽  
Wind Turbine Generator

Designing and Basic Experimental Validation of the World's First MW-Class Direct-Drive Superconducting Wind Turbine Generator

2019 ◽  
Vol 34 (4) ◽  
pp. 2218-2225 ◽  
Author(s):  
Xiaowei Song ◽  
Anne Bergen ◽  
Tiemo Winkler ◽  
Sander Wessel ◽  
Marcel ter Brake ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Experimental Validation ◽  
Direct Drive ◽  
Turbine Generator ◽  
Wind Turbine Generator

Cogging Torque Reduction in a Permanent Magnet Wind Turbine Generator

2002 ◽  
Author(s):  
E. Muljadi ◽  
J. Green
Keyword(s):  
Permanent Magnet ◽  
Wind Turbines ◽  
High Efficiency ◽  
Mechanical Vibration ◽  
Direct Drive ◽  
Turbine Generator ◽  
Cogging Torque ◽  
Wind Turbine Generator ◽  
Small Wind Turbines ◽  
Design Options

Most small wind turbines use permanent magnet (PM) generators. The generators are usually direct-drive (i.e., no gearbox is required). Direct-drive PM generators are characterized by low maintenance and high efficiency. Small wind turbines are usually self-starting and require very simple controls. Cogging torque is an inherent characteristic of PM generators and is caused by the geometry of the generator. Cogging torque affects self-start ability and produces noise and mechanical vibration. Thus, minimizing cogging torque is important in improving the operation of small wind turbines. In this paper, we investigate three design options to minimize cogging torque: uniformity of air gap, pole width, and skewing. Although the design improvement is intended for small wind turbines, it is also applicable to larger wind turbines.

Electromagnetomechanical Coupled Vibration Analysis of a Direct-Drive Off-Shore Wind Turbine Generator

2015 ◽  
Vol 10 (4) ◽  
Author(s):  
Michael Kirschneck ◽  
Daniel J. Rixen ◽  
Henk Polinder ◽  
Ron A. J. van Ostayen
Keyword(s):  
Wind Turbine ◽  
Structural Dynamics ◽  
Large Diameter ◽  
Air Gap ◽  
Direct Drive ◽  
Turbine Generator ◽  
Wind Turbine Generator ◽  
Generator Rotor ◽  
Turbine Generators ◽  
Wind Turbine Generators

In large direct-drive off-shore wind turbine generators one challenge is to engineer the system to function securely with an air gap length of about a thousandth of the outer rotor diameter. Compared to the large diameter of the generator rotor, the rolling element bearings can only be constructed with a relatively limited size. This makes it challenging to design appropriate constructions able to transmit the large applied magnetic forces encountered in the air gap of direct drive wind turbine generators. Currently, this challenge is met by designing stiff heavy rotors that are able to withstand the forces in the air gap. Incorporating flexibility into the design of the rotor structure can lead to a lighter less expensive rotor. In order to be able to do this the magnetomechanical coupling in the air gap and its effect on the structural dynamics need to be taken into account when predicting the intended flexibility. This paper introduces an approach for a multiphysical modal analysis that makes it possible to predict the dynamics of the strongly coupled magnetomechanical system. The new method is validated using measurements of a simple lab setup. It is then applied to a single-bearing design direct-drive wind turbine generator rotor to calculate the changes of the structural dynamics caused by the electromagnetomechanical coupling.

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