Harmonics study of nested-loop rotors in brushless doubly-fed induction machines

Wang, X.; Strous, T.D.; Lahaye, D.J.P.; Polinder, H.; Ferreira, Jan Abraham

Harmonics study of nested-loop rotors in brushless doubly-fed induction machines

Conference paper (2016)

Authors

X. Wang DC systems, Energy conversion & Storage -

T.D. Strous DC systems, Energy conversion & Storage -

D.J.P. Lahaye Numerical Analysis -

H. Polinder DC systems, Energy conversion & Storage -

Jan Abraham Ferreira ESE Programmes -

Research Group

DC systems, Energy conversion & Storage () (TU Delft)

Induction machine Brushless Cross-coupling Doubly-fed Nested-loop Space-harmonics Simple induction mode Time-harmonics

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Published Date

2016

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

Brushless doubly-fed induction machines (DFIMs) can be potential variable-speed generators for off-shore wind turbine applications. This special machine has two stator
windings with different pole-pairs. There is no direct magnetic coupling between two stator windings. A unique nested-loop rotor is designed to couple both stator windings. However, it results in lots of undesired space-harmonics in the airgap fields compared to conventional induction machines. There are few papers working on the design of nested-loop rotors. To design a better rotor, it is important to understand the complicated magnetic coupling in brushless DFIMs. This paper analyzes the space-harmonics and time-harmonics to provide a better understanding of the magnetic cross-coupling through the nested-loop rotor. The harmonic analysis is validated by FEM simulation and by taking measurements on a prototype in simple induction operation mode.