Novel Brushless Wound Rotor Synchronous Machine With Zero-Sequence Third-Harmonic Field Excitation

This paper introduces a novel topology for generating a spatial third-harmonic current component to excite the rotor field winding of a wound rotor synchronous machine to achieve brushless operation. In this topology, each of the three-phase windings on the stator is connected with a switch in paral...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2016-07, Vol.52 (7), p.1-4
Main Authors: Jawad, Ghulam, Ali, Qasim, Lipo, Thomas A., Byung-Il Kwon
Format: Article
Language:English
Subjects:
Brushless excitation
Electric potential
Flux
Harmonic analysis
harmonic excitation
Harmonics
Inverters
Magnetism
Motors
Rotors
Stator windings
Stators
Switches
synchronous machine
Topology
Winding
Windings
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Summary:This paper introduces a novel topology for generating a spatial third-harmonic current component to excite the rotor field winding of a wound rotor synchronous machine to achieve brushless operation. In this topology, each of the three-phase windings on the stator is connected with a switch in parallel. In particular, two antiparallel thyristors are used to switch during positive and negative half cycles. Two windings are mounted on the rotor of the machine: 1) the harmonic winding and 2) the field winding. Zero-sequence currents are generated, when the switches are closed near zero crossing for a short time interval. Consecutive operation of the switches creates an additional spatial third-harmonic current pulsating in the stator winding. The number of poles of the stator winding and the field winding is the same (four-poles in this case) to intercept the torque generation component of the air-gap flux, whereas, the number of poles of the harmonic windings is adjusted (12-poles in this case) to intercept the harmonic component of the air-gap flux and develop voltage across the harmonic windings. Harmonic voltage is rectified through a rotating rectifier to feed dc current to the field windings. Results verify the proposed topology simulated by a 2-D finite-element method.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2015.2512281