Journal of Electrical Engineering ›› 2022, Vol. 17 ›› Issue (1): 104-113.doi: 10.11985/2022.01.014

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Design and Analysis of Dual-stator Brushless Doubly-fed Generator with Simple-salient-poles Rotor

CHENG Ming(), ZHANG Changguo(), ZENG Yu   

  1. School of Electrical Engineering, Southeast University, Nanjing 210096
  • Received:2021-08-26 Revised:2021-12-20 Online:2022-03-25 Published:2022-05-06
  • Contact: CHENG Ming E-mail:mcheng@seu.edu.cn;1069792482@qq.com

Abstract:

Brushless doubly-fed generator (BDFG) is a most promising candidate for the wind turbine due to its simple structure, high reliability and low converter capacity. To improve space utilization and achieve higher power density, a new dual-stator brushless doubly-fed generator is proposed with the simple-salient-poles rotor (DSBDFG-SPR), which provides two separated windings, namely, the power winding (PW) placed in the outer stator and the control winding (CW) placed in the inner stator. A cup-shaped rotor sandwiched between the inner and outer stators consists of the simple salient poles and non-magnetic segments. The coupling between the PW and the CW is realized via the rotor based on the general airgap magnetic field modulation theory for electrical machines. A prototype of the DSBDFG-SPR with rated PW power of 1.5 kW is designed and optimized. The keys of this paper are determination of pole/slot combinations, the rotor optimization and size optimization. The electromagnetic characteristics of the DSBDFG-SPR are analyzed by 2D finite element analysis (FEA) to verify the reasonableness of the proposed model.

Key words: Brushless doubly-fed generator, dual-stator, simple salient poles, design optimization

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