Abstract
The efficiency of using three-phase asynchronous electric motors with a squirrel-cage rotor in the transport sector depends on increasing the level of their reliability, which is possible due to the constant improvement of existing and the development of new diagnostic methods of high reliability. The most labor-consuming and difficult is the possibility of diagnostics and differentiation of turn-to-turn closures of the stator winding. The aim of the work is to establish the nature of the manifestation, influence on energy indicators and determine the diagnostic parameters of turn-to-turn closures on one and simultaneously on two phases of the stator winding of an induction motor using mathematical modeling methods. This goal was achieved through a set of studies using a refined mathematical model of an asynchronous motor, which allows you to create asymmetry of the stator windings, simulate turn-to-turn connections on one phase and simultaneously on two phases in various combinations. The most significant result of the work is the establishment of the dependences of the pulsations of the electromagnetic moment, the unbalance coefficient of the stator phase currents and the energy characteristics from the turn-to-turn short-circuits of the phases of the stator windings. The significance of the results obtained consists in establishing the dependences of the manifestation of various types of damage to the phases of the stator winding necessary for choosing a method for diagnosing turn-to-turn faults in the stator windings when building an effective diagnostic system for asynchronous motors as part of transport infrastructure drives.
Highlights
The fault analysis of the asynchronous motors [2,3] showed that about 15 % of the total amount of this motor type failures occurs because of the inter-turn short-circuits in the stator phase windings
- the effect was studied of the inter-turn shortcircuit at a single phase of the stator winding and at two-phase stator simultaneously on the electromagnetic torque ripple factor and the unbalance factor of the stator phase currents
The research results showed that the highest value of the torque ripple factor is exhibited in the idle-run mode during the change in the complex resistance
Summary
In order to ensure the efficient operation of the transport system it is necessary to improve its reliability. To develop the diagnostic system with an authentic decision for the determination of a different kind and degree of a stator winding failure, a thorough research must be performed and the character of manifestation and modifying the parameters occurring upon the inter-turn short-circuit simultaneously on two phases of the stator winding must be studied. This phenomenon may happen in the operational process of the asynchronous motor. Saturation and rotor current displacement, which affect the dynamic of the model and the losses
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