Minimising Unbalanced Magnetic Pull in Doubly Fed Induction Generators

Haw wooi Chuan, Jonathan Shek

Research output: Contribution to journalArticlepeer-review


The Doubly Fed Induction Generator (DFIG) has become increasingly popular in wind energy generation because of the lower power electronics converter rating required. However, the small airgap of a DFIG causes it to be vulnerable to slight misalignment of the rotor which may cause a large unbalanced magnetic pull (UMP) to be exerted on the bearing. The reliability of the generator is important to reduce revenue loss; this is especially the case for generators in offshore wind turbines where minimising the cost of energy is crucial in completing with more established forms of electricity generation. This paper had proposed the usage of stator damper windings to reduce the UMP. An example of a 4-pole DFIG with static eccentricity is shown where Finite Element Analysis (FEA) is used to verify the UMP for cases with and without damper windings. Finally, additional losses due to rotor eccentricity are discussed.
Original languageEnglish
Pages (from-to) 4008 - 4011
JournalJournal of Engineering
Issue number17
Early online date20 May 2019
Publication statusE-pub ahead of print - 20 May 2019
EventIET Power Electronics, Machines and Drives - , United Kingdom
Duration: 19 Apr 2016 → …

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