Hutorova M. Asynchronous motors diagnosis based on electromagnetic characteristics analysis.

Object of research: the electromagnetic processes in asynchronous motors at the birth and development defects. The purpose of research: to obtain new data on the impact of the birth and development defects of the rotor and the stator on the electromagnetic characteristics of the machine and the development of effective ways and methods of diagnosis of induction motors. Methods of research: The solution of the tasks carried out using the methods of mathematical modeling, methods of spectral analysis, methods of experimental research. Theoretical and practical results: A mathematical model and method of calculating the effect of the defects of the stator winding on the magnetic field in the air gap of the induction motor. The effects of interturn short circuits in the stator winding of the induction field in the air gap. Quantitative assessment of increasing the intensity of the magnetic field in the air gap with the number of turns in a slot closed with increasing width of the damaged coils. The mathematical and physical modeling of electromagnetic processes in an asynchronous motor at the birth and development of a short-circuited rotor winding defects. Novel diagnostic parameters and characteristics (damping rate of the magnetic induction in the air gap and constant Fourier expansion curve of the magnetic induction in the air gap). A method for determining the damaged rods winding rotor induction motor on the basis of the scan magnetic field current of the rotor in short-circuit in the area of the sensor mounted on the stator. A method of diagnosing defects of the stator winding on the basis of the phase currents and the losses that can be applied both during the diagnostic test, and functional. The region of maximum sensitivity depending on the terminal voltage of the stator winding and the load on the shaft. Sphere of use: thermal power plants, hydroelectric power stations, manufacturing plants in the systems of control and diagnostics of technical condition of blood pressure.