A finite element analysis of an electromagnetic flow control valve

The behavior of an electromagnetic control valve under a perturbative magnetic field is evaluated. The electromagnetic valve is numerically modeled by means of a nonlinear 2D field-element code. The electromagnetic force produced on the valve's plug is obtained using the Maxwell stress tensor approach, under both normal and perturbed conditions. The numerical results are compared with those of experimental tests, which have been carried out under the same conditions as the numerical analysis

Harmonic Modelling of Houshold and Commercial Aggregate Loads

The paper presents the harmonic models of different aggregation of domestic and commercial customers, obtained on the basis of a set of measurements. After an investigation on the customer characteristics (number of users, rated power, consumption), a correlation between size of aggregation and harmonic emission has been established

Evaluation of damages due to voltage dips on devices and industrial plants

Evaluation of disrupted operations due to voltage dips on industriai processes depends on th\ue8 interaction between equipment sensitivities and characteristics of expected voltage dips on th\ue8 electrical network. In case of continuous processes, a multi-motor System driven by a series of adjustable speed drives is required in order to regulate and to maintain Constant th\ue8 characteristics of th\ue8 end product. In th\ue8 paper an alternative electrical scheme for reducing high sensitivities of ASD to voltage dips is proposed and compared with a traditional approach. Finally, costs and benefits of th\ue8 proposed solution is discussed for th\ue8 case of a paper industry, taken as typical example of multi-motor continuous process

Le ESCO e il mercato dell'efficienza energetica

Il libro illustra il nascente mercato delle Eco in Italia e ne illustra le modalit\ue0 di operazion

Lezioni di Elettrotecnica I

Reti lineari in regime stazionario, campo di corrente, elettrostatica, elettromagnetismo, reti in regime sinusoidale, sistemi trifas

Lezioni di Elettrotecnica III

Esercizi di reti in regime stazionario, sinusoidale monofase e trifase, reti con accumulo di energia, reti magnetiche. Trasformatori. Motoro asincroni. Linee elettriche

Lezioni di Elettrotecnica II

Principi di funzionamento e caratteristiche costruttive di: trasformatori, convertitori statici di energia, macchine sincrone, macchine asincrone, macchine in corrente continua, impianti elettric