Abstract
Effect of asymmetry of supply voltages on asynchronous motor operation modes was investigated using the computer-aided simulation experiments, the software complex Matlab and the package program Simulink. Publication relevance is determined by the necessity for performance of comparative analysis of the level of effect of asymmetry of supply voltages on asynchronous motors of different series and power capacities. Six motors of three different power capacities (5.5, 55, 160 kW) and of two different series (4A, AI) were modeled for investigation. The value of asymmetry of supply voltages was changed from 0 to 5%. The motor shaft load was changed from 0 to 120% of the motor rated load. Comparison of dependencies of the phase currents on the voltage unbalance ratio by reverse sequence (K2U) of asynchronous motors with short-circuited rotor series 4A and AI was made. The analysis and discussion of obtained investigation results were performed, recommendations on operation of asynchronous motors series 4A and AI in conditions of asymmetry of supply voltages were given.
Highlights
At present the three-phase AC asynchronous motors (AM) is the most common type of the electrical machines
AM are produced by large series, of which the most widely spread are the general purpose machines of series 4A, AI
Series 4A, AI are the mass series of asynchronous motors designed for using in different industry areas
Summary
At present the three-phase AC asynchronous motors (AM) is the most common type of the electrical machines. Within the framework of this publication, it is necessary to perform investigation of synchronous motor with short-circuited rotor, their most common series 4A and AI, to make analysis of the effect of asymmetry of voltages on AM operation modes based on the motor series and power capacity. To get a more complete picture of the effect of asymmetry of voltages on AM, it is necessary to compare dependencies of AM phase currents on the voltage unbalance ratio by reverse sequence (K2U), under different motor shaft load values They enable formulating the proposals aimed at improvement of AM operating reliability and, in addition, prevention of occurrence of situations determined by overheating of winding insulation
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