This paper presents a comparative study between the axial-flux and radial-flux permanent-magnet synchronous generators for a 3 kW wind turbine application. This study emphasizes the most cost-effective solution to be implemented by the industrial partner. There are three constructive types of electric generators considered in this work. All are based on permanent-magnet synchronous generators (PMSGs), but one has an axial-flux topology, the other one is a radial-flux outer-rotor machine and the third one is a radial-flux inner-rotor machine. Finite-element field analysis was made for the three PMSGs in order to compare their efficiency and active materials estimated cost. The results show that the axial-flux PMSG is the best solution for micro-wind turbine application.

In this study, the design optimisation of a synchronous reluctance machine for light electric vehicles is proposed, to increase efficiency and reduce torque ripples. The existing machine was structurally optimised, using dedicated genetic algorithms, replacing only the rotor and keeping the stator and it's winding untouched. Starting from the original design of the rotor implemented in Flux2D, a finite element analysis software, and the genetic algorithm optimisation implemented in Matlab, a complex co‐simulation was accomplished to obtain a rotor architecture that increases the machine's performances and decreases the torque ripples. By this, performing rotor skewing is not needed any more, hence the torque loss due to it was cancelled. The optimised rotor design increases the machine performances by higher mean torque, no skewing, <8% torque ripples, higher efficiency and better inductance characteristics. Comparative results obtained both in simulations and experimental measurements prove positive outcomes of the optimisation process.

While the exhaustion of carbon based fuels has become a certitude, the use of alternative fuels became more popular in the last decades. The renewable energy sector emerged, providing an alternative to conventional energies; amongst them the wind and solar energies became extremely popular in the last decades, supplying important parts of the total energy required in countries like Germany or the United States of America. Besides these, the wave energy sector represents a huge, yet unexploited domain, which could prove to be a long time solution for the forthcoming energy shortages.

The present study deals with the theoretical and experimental analysis of a permanent magnet claw-pole synchronous generator (PMCPSG) suited for small rating, direct-driven applications, such as small-scale wind power plants. After the computation of the machine main dimensions using an analytical algorithm, a Hooke–Jeeves optimisation procedure was implemented in order to obtain the optimal geometry of the PMCPSG. The electromagnetic field and static performances are studied, based on three-dimensional finite element analysis. A prototype of the PMCPSG is tested on a test bench for resistive and inductive loads.

The paper present the analysis of the performances of an electrical machine used for electric traction in automotive application. The electrical machine under study in this paper is a flux synchronous reluctance machine (SynRM) with 4 poles and 27 slots. The study design requires some analytical analysis in SPEED program, followed by a numerical one in order to obtain the performances of the proposed machine. The control strategy of this machine was also presented.

This paper presents the design and analysis of the performance of an electrical machine proposed to use for the propulsion of an electric bike. The electrical machine under study in this paper is a flux synchronous reluctance machine (SynRM) with outer rotor. The study design requires the analytical analysis in SPEED program, followed by a numerical one (Flux 2D) in order to obtain the performances of the proposed machine.