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A DEVICE FOR DIAGNOSTICS OF TURN-TO-TURN FAULTS AND BEARINGS DEFECTS OF INDUCTION ELECTRIC MOTORS

The problem of induction electric motors diagnostics is considered in the paper. Now many methods of induction motors diagnostics are developed. They are based on analyzing the vibrations of the electric motor elements, acoustic vibrations of the running electric motor, magnetic flux in the engine gap, secondary electromagnetic fields of the machine, temperature of the machine separate elements, work and condition of the mechanical knots, iron content in oil, isolation condition, electric and others machine parameters. Turn-to-turn faults in stator winding remain ones of the most widespread malfunctions. This malfunction is difficult to define at early stage. The electric motor is less exposed to damage at early detection of this malfunction. The researchers have proved that turn-toturn faults in the stator winding have to be defined immediately even at small damage. The engine can keep running but the fault will increase and cause heating in the damaged turns. Therefore the existence of turn-to-turn faults in the stator winding has to be timely defined. The developed diagnostics methods of turn-to-turn faults of induction engines, for example, Park’s vector approach, a research of magnetic flux or spectral analysis of rotating engine allow us to find the defect already at a late stage of the fault development. The device of induction engines diagnostics for defining the turn-to-turn faults at early stage of malfunctions is offered. The electric motor diagnostics can be test and functional. The device allows us to determine turn-toturn faults by the number of engine speed and time of his running-out. The device has a number of advantages, such as expanded functionality, increased accuracy and reliability, electrical safety. The offered device allows us to protect the electric motor from negative impact of turn-to-turn faults and prolong the term of his trouble-free operation.