Creating the equivalent current of asynchronous motor with controlaction modulation

Abstract

Based on the fact that asynchronous motors go out of service for different reasons (through the overloads, adverse environmental conditions, low quality of power supply and so on) the necessity of carrying out of complex repairs was determined. As a result, it’s possible to re-exploit the engine for a long time. The most weak point of electric motor during the repair works was identified. Considering the previously known publications that indicate the possibility of research real characteristics of repaired motor, there was provided the qualitative analysis, including existing deficiencies that would be reduced with help of the proposed system. Consequently, several solutions are proposed for motor windings electromagnetic energy change that help to load the motor excluding the possibility of mechanical influence to the shaft. These circumstances are substantiated by the formulas of the frequency, voltage and torque change. The graphs of artificial and natural mechanical characteristics with all work points indication are given for representation of electric motor full load cycle. The system was simulated with full cycle of loading and the results are presented in the form of phase coordinates oscillograms. The value of static load was chosen, according to the compliance terms of the rated current and sticking to nominal torque of the asynchronous motor. It was further defined and illustrated on oscillogram the loss power for showing benefit on the part of economy. As the research purpose was not only to produce a universal model, but also to make it economically profitable, the power loss was also determined and presented in an oscillogram form.