Abstract

This paper emphasizes, once again, the importance of ventilation systems for ensuring thermal comfort in industrial spaces. For this purpose, a dynamic fault regime of variable reluctance synchronous motors (RSM) used to drive such systems (case of occurring an accidental resistive torque) is analyzed from a theoretical point of view (with experimental confirmation). At the beginning, an introduction in the issues of the paper is made. A brief bibliographic analysis and some relevant images regarding the air flow driven by industrial ventilation and air conditioning systems are presented. In order to analyze dynamic regimes of RSM, a Matlab program was carried out, by using a mathematical model written in the two axes theory. A series of graphs have been obtained by running it for a specific case; they emphasize the evolution over time of the main electrical, magnetic and mechanical quantities of the motor. There have been obtained different evolutions of the operation points in various coordinates (phase current, longitudinal and transverse currents of the stator and rotor, magnetization current, magnetization flux, magnetization flux components, torque and speed). The graphs obtained led to a series of relevant conclusions regarding the behavior of the driving motor of the installation (conclusions regard the way in which an increase in the resistant torque influences the values and durations of the analyzed dynamic quantities). The paper ends with Acknowledgment and the corresponding References.

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