NDLI: Computationally efficient calculation of skew effects in brushless doubly-fed induction machines

Content Provider	IET Digital Library
Author	Wang, Xuezhou Strous, Tim Dave Lahaye, Domenico Polinder, Henk Ferreira, Jan Abraham
Abstract	Brushless doubly-fed induction machines (DFIMs) have great potential as variable-speed generators in wind turbines. Undesired space-harmonics exist because the special rotor needs to couple to two stator windings with different pole-pair numbers and different frequencies. These undesired space-harmonics could lead to noise, vibrations and low power quality. Applying skewed slots can overcome the above drawbacks. Previously, a two-dimensional (2D) multi-slice finite element (FE) method was applied to study the effects of skew which was time consuming. In the stage of initial design, it is not efficient to use such a model to predict how much the average torque and the torque ripple would be reduced by skewing slots. This study makes use of normal 2D FE results and applies skew factors in post-processing to investigate the influence of rotor skew. It also proves that to apply skew factors appropriately, not only the space-harmonic order needs to be considered, but also the time-harmonic order. The proposed method can give an approximate prediction of skew effects with limited computing time. The results also indicate that skewing the rotor slot over one stator slot pitch could be a good choice to minimise the torque ripple in a brushless DFIM with a nested-loop rotor.
Starting Page	303
Ending Page	311
Page Count	9
ISSN	17518660
Volume Number	11
e-ISSN	17518679
Issue Number	Issue 3, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/11/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2016.0354
Journal	IET Electric Power Applications
Publisher Date	2017-03-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asynchronous Machine Brushless DFIM Brushless Doubly-fed Induction Machines Computational Efficient Skew Effect Calculation Finite Element Analysis Harmonics Limited Computing Time Low Power Quality Nested-loop Rotor Noise Normal 2D FE Result Pole-pair Numbers Rotor Slot Rotors Skew Factors Skewing Slot Stator Slot Pitch Stator Winding Stators Time-harmonic Order Torque Ripple Minimisation TurboGenerator Undesired Space-harmonics Variable-speed Generator Vibrations Wind Power Plant Wind Turbine
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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