Sistema automatizado para teste em motores elétricos de indução trifásicos de baixa potência

Abstract

Examining the current global context of industries and factories, we can realize that the continuous production process seeks to generate, in the shortest time, the greatest amount of possible product, that is, a continuous and constant production process, widely used in various types of industries, such as petro-chemicals, steel and pulp and paper. This continuous flow of production requires a substantial investment in machinery that must not, under any circumstances, interrupt the production process. Thus, the high availability of such equipment - much of which use electric motors - becomes a strategic role for business, representing a huge competitive advantage. And, one way to allow electric motors to remain available as long as possible for production is through the identification of anomalies – both available and installed equipment in the production - in order to prevent its failure and thus generate a reduction in quantities and times of the production line stops. Thus, this work seeks to develop an automated system for evaluating electromechanical conditions of three-phase induction motors and generate a diagnosis of the condition of the equipment. Therefore, the automated evaluation system of electric motors must have the ability to perform a sequence of pre-established tests and at the end of the analysis, send a printed report consisting the diagnosis on equipment condition evaluation. Therefore, it was developed an embedded system which consisted in the use of microcontrollers, sensors and transducers, and the development of an interface between the user and the system manner an LCD screen and a touch screen. Regarding the application of the rated torque for analysis of consumed motor’s current, it was developed a mechanically actuated device driven by the rotational equipment shaft, exerting a load on the pressure sensor (load cell) mounted at a predetermined distance center of rotation.