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Abstract.This paper reviews the set of existing sustainability indices which are related to energy efficiency a critical factor in the actual moment, unveiling the main differences between indices, focusing the attention on those indices more adequate to policy making, finding the most adequate sources for indicators to compose the indices from a European perspective, showing the inconsistencies and limitations of most indices and the need of a simple index based on several complementary indices.

Φ Abstract -In this work we present the study and identification of the frequencies of the signals implied in a sine PWM control based on DSP of electrical machines, especially in a three-phase motor of induction. We will also try this identification will be used as a basic for a later analysis of the influences they will originate in the acoustic noise level emitted by the machine.

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