Brushless Doubly Fed Induction Machines

Strous, Tim; Wang, Xuezhou; Polinder, H.; Ferreira, J. A.

Brushless Doubly Fed Induction Machines

Magnetic Field Analysis

Journal article (2016)

Authors

Tim Strous DC systems, Energy conversion & Storage, Electrical Power Processing

Xuezhou Wang DC systems, Energy conversion & Storage

H. Polinder DC systems, Energy conversion & Storage

J. A. Ferreira Electrical Power Processing

Research Group

DC systems, Energy conversion & Storage

Harmonic analysis Spectral analysis DFIG Slotting Cross coupling Space harmonics Time harmonics Brushless doubly fed machine (BDFM) Magnetic field model

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Published Date

2016-11

Language

English

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Research Group

DC systems, Energy conversion & Storage

Abstract

The brushless doubly fed induction machine (DFIM) shows great potential as a generator in large-scale wind turbines. The motion of the magnetic field in this machine is not a simple rotation, which makes it not so straight forward to understand its operating principles. This paper develops an analytical magnetic field model for the brushless DFIM that includes the effects of rotor time
harmonics and space harmonics due to the winding distribution and slotting. Using a case study machine, the developed analytical model is then validated by comparison with finite-element (FE) calculations. In addition, a 2-D spectral analysis is applied to the FE derived radial air-gap magnetic field as a function of time. This analysis verifies the space–time relations of the rotating magnetic field components in the airgap of the brushless DFIM. Finally, the developed analytical magnetic field model is used to analyze the brushless DFIM operating principles. The interaction of the stator magnetic field with the rotor nested loops is explained, as well as the development of electromagnetic torque.