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This paper concerns a three-phase self-excited induction generator used for autonomous power generation. It presents a robust control strategy which makes it possible to maintain the frequency quasi constant during the voltage regulation without any control loop on this variable. This strategy, which also prevents the machine disengagement, uses as power converter a simple dimmer. The obtained theoretical and/or numerical results are validated on a laboratory test bench that allows the analysis of this control law effectiveness.

This paper deals with Life Cycle Assessment (LCA) of induction machines and try to determine whether a coppercage rotor is better than an aluminium-cage one, for a given using time and considering the global environmental footprint. The paper focuses on induction motors directly connected to the power grid, without electronic converters. The LCA takes into account the materials extraction, the machine construction, the use and the end of life for several criteria. In the first part, a copper conductor is compared to an aluminium one and results are discussed considering the part of recycled material in the rotor manufacturing process. In a second part, two machines with the same efficiency are compared. The environmental impacts differences are discussed. In the third part, two machines of the same sizes, but with a different rotor, are compared considering various usage times. The lower losses of the copper-rotor machine yield a significant advantage for the efficiency but the gains are smaller when the global life cycle is considered.

The aim of this paper is to compare electrical, mechanical and thermal characteristics of two self-bonding solutions to the impregnation one. An alternative solution is developed without Volatile Organic Compound (VOC). The study focuses on two parameters: the Partial Discharge Inception Voltage (PDIV) of turn-to-turn insulation and the thermal conductivity between the heart of the winding and the magnetic core. This study place the problem of electrical machines design in a broader context which includes the life cycle analysis, in order to go towards the eco-design of electrical machines able to reduce the global environmental footprint.

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