POSSIBILITY FOR STUDY OF THE RELUCTANCE SYNCHRONOUS MOTORS DYNAMIC REGIMES

This paper presents a possibility for studying the dynamic regimes of the reluctance synchronous motors. There are detailed the mathematical model and the graphics obtained by simulation in certain dynamic regimes. The reluctance synchronous motors are permanently subdued to certain electrical and mechanical disturbances. These disturbances cause dynamic regimes which can finish by a new steady state, by a continuous regime of oscillations around the synchronism speed or by an unstable regime in which the synchronism is lost. As a consequence, the paper analyzes the influences of certain disturbances on the operation motor. The experimental stand used and the results obtained are also presented. Finally the main conclusions are emphasized: - the RSM is very sensitive to the parameters variation; it results, therefore, that the simulations are very important in the machine design. A design conceived without performing preliminary simulations, regarding the machine behaviour for different values of the parameters, is a mistake. - the RSM has got a different behaviour over different values of the torque shock, at the same inertia moment; - the synchronism loss is conditioned by the value of the torque shock applied to it; - the dynamic stability decreases at the same time with the supply voltage decrease (when the decrease is under a certain limit, the synchronism is lost); - the previous conclusions emphasize the fact that the RSM static stability is dependent both on the disturbance magnitude and character and on the initial conditions; - with the help of some simulations like the ones presented before it is possible to establish the dynamic stability limit for each RSM, which is an important work instrument for the designers of such type of motors.