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Magnetic Field Distribution and Operating Characteristics of a Hybrid Excitation Generator Based on Integrated Brushless Excitation

Authors :
Yinhang Ning
Yaohua Hu
Kai Wang
Xibo Yuan
Chuang Liu
Shushu Zhu
Source :
IEEE Transactions on Magnetics. 52:1-12
Publication Year :
2016
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2016.

Abstract

In general, the brushless wound rotor hybrid excitation synchronous generator (HESG) needs a separate exciter. In this paper, a novel integrated brushless excitation HESG (IBE HESG) is developed by integrating the excitation section into the iron core of wound rotor HESG. Compared with the conventional brushless excitation method, the axial length of the IBE HESG is shorter and the original topology of the wound rotor generator is not changed. The excitation section has two sets of windings: stator excitation windings and rotor armature windings. The stator excitation windings are installed in the stator slots evenly. The static excitation field is established by the dc excitation current of the stator excitation windings. The rotor armature windings are buried in the rotor armature slots around the rotor. The static excitation field induces a voltage in the three-phase rotor armature windings and supplies the dc current to the rotor excitation windings through a rotating rectifier on the rotor. The magnetic field distribution is analyzed by the frozen permeability method to decouple the multimagnetic circuits. Also, the influencing factors of excitation efficiency are studied and the parameters of the IBE HESG are obtained to achieve a reasonable excitation characteristic. Finally, the theoretical analysis is confirmed by the experiments on a 1.5 kVA/50 Hz prototype generator. The results show that the output power can be regulated over a wide range.

Details

ISSN :
19410069 and 00189464
Volume :
52
Database :
OpenAIRE
Journal :
IEEE Transactions on Magnetics
Accession number :
edsair.doi...........fbc57304594dcb4efc23db74d5ae43df