Abstract
The article contains an overview of methods for diagnostics of malfunctions in induction motors (IMs). Based on the review of information sources, it is shown that there are no methods, hardware or software complexes that make it possible to determine the malfunctions of windings of induction motors during their operation. In this paper, the technique that allows us to determine the location of faults in the windings of an IM, as well as to predict the development of faults, is purposed. In this paper, scientific justification for the procedure of diagnostics for the development and identification of malfunctions in the windings of AD is given. The procedure is based on recording of real phase supply voltages, consumed currents, and simulating the resultant rotating magnetic field of the motor on their basis, as well as energy characteristics and their subsequent comparison with the resulting rotating magnetic field of the engine with obviously serviceable and faulty windings on the grounds determining the distortions of the rotating magnetic field of the stator, and by the fault indicators of the windings. The investigation problem is formulated. The problem consists in developing diagnostic signs of malfunctions in the stator winding and rotor windings from the oscillograms of phase voltages and currents registered during normal operation of the electric drive. The criterion of problem solving is obtaining the identifiers (signs) of the short-circuiting malfunctions and conductor breaking of stator winding i-th phases, short-circuited rotor rod breaking and deteriorating of the motor magnetic system. The coordinates of the vector of the stator magnetic flux on the complex plane, which determine the shape of its hodograph; effective phase currents values, full, active and reactive powers, energy conversation efficiency and cos φ values are taken as identifiers. The problem is solved by mathematical modeling of the resultant rotating magnetic field and its components in terms of the magnitude of the stator phase currents, magnetizing currents and rotor currents, as well as the values of the energy conversation efficiency and cos φ of the asynchronous motor operating in symmetric and asymmetric modes. An example of the solution of the problem with the application of the proposed method and the developed software package is given.
Keywords
Asynchronous motor, diagnostics, motor windings, motor winding malfunctions, simulation, identification, software complex.
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