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The goal of the paper is to study the possibility of increasing the power capability of direct-drive PM wind generators with respect to the established quality criteria: electromagnetic torque and the power trasferred to the grid. The studied solution is a polyphased system with a phase number multiple by 3, i.e. a multi-star system. The influence of the number of stars and their phase shift are investigated. -KeywordsWind generator systems, penranent magnet synchronous motor, multiphase drive LOB 2005 -I2'rc.xkn 0.1 llolyplasr,d rvlodular DiLwt-Diive Wind Turbrinc: Ociv-rttc-r BRISET $St4lle DEl 2005 -L)i--;c11i ISBN :90-75815-08-5 1>q1

In order to increase the power capability of direct-drive PM wind generators with respect to established quality criteria like the electromagnetic torque and the power transferred to the grid, a polyphased multi-star system is studied. The influence of the number of stars, their phase shift and the waveform of the electromotive force are investigated. The possible configurations, i.e. the numbers of magnets and slots, are found and compared.

Purpose -The purpose of this paper is to present two optimization methodologies based on interval branch-and-bound algorithm. Design/methodology/approach -These techniques decrease the total time of computation, even in spite of discrete nature of some of the design variables. Computational experiments performed on multivariable optimization problem reveal great accuracy and technical validity of developed approaches. As an example, the optimal design of the induction machine (IM) was treated, where the aim was to find the set of the most efficient and, at the same time, cheapest in the manufacturing configurations. Findings -In this paper, two approaches were developed for resolving the problem of optimal design of IM with discrete variables. The strategy of constructing the meta-models is utilized and put in practice. The methods show relatively high efficiency and robustness of obtained results. Originality/value -These approaches are the core technics of the developed industrial application, which help identify the set of optimal configurations of IM with the criteria of optimality such as total cost of manufacturing and the efficiency of IM.

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