No abstract

No abstract

On donne les fr6quences et les facteurs de d6polarisation de certaines bandes observfes dans les spectres Raman des solutions de sels de magn6sium, zinc, aluminium et beryllium, dans l'eau 16g~re et dans l'eau lourde, que l'on attribue ~t des cations complexes de la forme Me(OH2) n et Me(ODe)n, complexes dont la structure serait analogue g celle que l'on observe dans les cristaux hidrat6s. Avec certaines hypoth+ses on peut calculer les fr6quences propres totalement sym6triques de ces complexes et celles-ci sont voisines des fr6quences exp6rimentales.

This paper presents an investigative work about the application of State Space Model-Based Predictive Control in a three-phase Permanent Magnet Synchronous Motor with trapezoidal back-electromotive force, for speed control. Such motor is utilized in the white goods appliances industry and also in automotive and medical applications, among others, especially due to its high effiency and long life cycle. The predictive control methods present a differential in the driving performance for industrial applications, mainly by enabling the imposition of constraints. In this work, a linear prediction model identified with a Least Mean Squares algorithm is used with the State-Space predictive control approach. Such predictive method is interesting for industrial applications for being easy to tune and, in addition to the imposition of constraints, allowing ponderation between tracking performance and spent energy. The utilization of constraints is discussed for the predictive algorithm in this work. There are satisfactory simulated and experimental results that show advantages in using the mentioned control method to drive the Permanent Magnet Synchronous Motor.

No abstract