Mathematical model of switched reluctance motor

An accurate mathematical model of a switched reluctance motor (SRM) is a base for the motor design and performance analysis. It is important for the mathematical model to determine the flux-linkage dependence upon a current and a rotor displacement angle. The finite-element method was used to calculate the flux-linkage for a particular current and a rotor displacement angle. This method takes into account the salient pole geometry of the stator and the rotor and the nonlinear properties of the magnetic materials. In order to increase the accuracy of the calculations the flux-linkage was measured too. The calculated and measured flux-linkage data were interpolated with the B-splines. Comprehensive simulations were made and compared with the measurements

Event-by-event mean pT fluctuations in pp and Pb-Pb collisions at the LHC

Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at s√ = 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at sNN‾‾‾‾√ = 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb–Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena