Energy Efficiency in Motor Driven Systems by Harry David Craig (auth.), Professor Francesco Parasiliti,

By Harry David Craig (auth.), Professor Francesco Parasiliti, Dr. Paolo Bertoldi (eds.)

This booklet studies the state-of-the-art of energy-efficient electric motor pushed process applied sciences, that are used now and within the close to destiny to accomplish major and in your price range power discount rates. It contains the hot advancements in complex electric motor end-use units (pumps, fanatics and compressors) by way of a few of the greatest brands. regulations and courses to advertise the massive scale penetration of energy-efficient applied sciences and the marketplace transformation are featured within the e-book, describing the reviews conducted in several elements of the realm. This wide insurance contains contributions from proper associations within the Europe, North the United States, Latin the US, Africa, Asia, Australia and New Zealand.

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A more energy efficient way of regulation is frequency regulation: the amount of produced air is constantly varying by electronically adapting the speed of the compressor drive. Depending on the load profile, energy savings from 15 up to 35 % were found in Belgian industry. ------ power Fig. 2. pressure and power curve for load/unload regulation Regulation of a group of compressors In industry, the most frequently used regulation system for a group of compressors, is the so-called cascade system: each compressor is equipped with a load/unload regulation system and each compressor has its own pressure limits.

If the manufacturer only gives the value of these losses to nominal power, it is a good approach to calculate the efficiency to other load degrees supposing the following equation: P paras nom ( 2 2) 2 I - 10 I nom -1 0 Pparas (I) = 2 P parasnom I nom =Nominal stray load losses. =Nominal stator current On Site-Measured Efficiency With the proposed method it is possible to elaborate a chart like the one that comes next. The on site-measurement has good precision, it is easy to get, it allows us to visualize what happens to the motor to any load degree and, what is more important, allows us to predict the economic convenience of substituting the motor in analysis for another more efficient.

The following figure shows a sample of an experimental registration of the motor input power, the speed and the dynamic efficiency. The efficiency dynamic measure is, approximately, similar to the efficiency of the motor, for values of the speed around the synchronous speed. The maximum dynamic efficiency is a useful parameter of identification of the characteristics of the motor, since it is experimentally repeatable and representative of the losses of the motor. It is also possible to calculate from these records the efficiency in function of the mechanical output power of the motor.

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