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Design of Brushless Doubly-Fed Machines Based on Magnetic Circuit Modeling

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4 Author(s)
Min-Fu Hsieh ; Dept. of Syst. & Naval Mechatron. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; I-Hsien Lin ; You-Chiuan Hsu ; McMahon, R.A.

This paper proposes a magnetic circuit model (MCM) for the design of a brushless doubly-fed machine (BDFM). The BDFM possesses advantages in terms of high reliability and reduced gearbox stages, and it requires a fractionally-rated power converter. This makes it suitable for utilization in offshore wind turbines. It is difficult for conventional design methods to calculate the flux in the stator because the two sets of stator windings, which have different pole number, form a complex flux pattern which is not easily determined using common analytical approaches. However, it is advantageous to predict the flux density in the teeth and air-gap at the initial design stage for sizing purposes without recourse finite element analysis. Therefore a magnetic circuit model is developed in this paper to calculate the flux density. A BDFM is used as a case study with FEA validation.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )