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This paper presents a broad overview of wind energy conversion generators in muti-megawatts wind turbines. Both technological and economic advantages and drawbacks of each generator system technology (geared and gearless) are detailed. Moreover, comparison based on weight, diameter, cost, energy yield and axial length between different electrical generators is discussed. This comparison helps us to find the suitable structure of generator system for high-power wind turbines. Additionally, recent developments on generators are introduced including some examples of their implementation in ultra-large operational wind turbines. Finally, this review could help to understand the potential future choices in the design of wind turbine energy conversion systems.

In this paper, the translator eccentricity of a tubular linear permanent magnet (TLPM) machine is studied using a 3D finite element analyses. Translator eccentricity in linear machines, as rotor eccentricity in rotating machines, is inevitable. It should then be evaluated and studied during the design stage to avoid performance degradation and life time reduction. Apart from few publications, translator eccentricity in tubular linear machines has been rarely addressed in scientific literature. The aim of this study is to contribute to filling this gap. The effect of static eccentricity of the translator is studied for a surface mounted TLPM motor. While the novelty may seem limited, this study should be regarded as a step toward the development of modeling approaches allowing a good “accuracy/computation time” ratios.

For electromagnetic actuators whose magnetic fields are three-dimensional, the use of the 3D finite element (FE) method is required. On the other hand, 3D FE analysis is expensive in computation time, especially for high power machines involving potentially high numbers of nodes. In this paper, a 3D reluctance network (RN) modeling approach is proposed for the pre-design of permanents magnets synchronous machines (PMSM). The RN model developed is used to model three types of electrical machines (linear machine, radial field rotating machine and axial field rotating machine). Our goal is to establish lightweight models for the pre-design of electrical machines. The performances (local and global quantities) of these machines are evaluated using this 3D RN modeling. The results obtained from this approach are validated by comparison with results issued from the 3D FE analyses.

This paper presents a study on a novel design of a Wound- Field Flux -Switching Linear Machine. Inspired by the rotating Wound-Field Switched Flux machine 18/10 topology, the concept has never been explotied in the case of a linear motor. Different armature winding configurations (double-layer and simple-layer configurations) are studied and compared with regards to open-circuit flux-linkage, force and force ripple. A non-linear Magnetic Equivalent Circuit model founded on Mesh Based Reluctance Network is developed with the purpose of addressing pre-design studies. The mesh based generated reluctance network model gives the possibility to make rapid changes in model proprieties and winding configurations. This semi-analytical model is validated using 2D Finite Element Analysis.