METHOD FOR EDDY CURRENT MONITORING OF ROTOR BANDAGE SHELLS INTEGRITY Russian patent published in 2019 - IPC G01N27/90 

FIELD: electric machine engineering.

SUBSTANCE: invention relates to electric machine engineering and can be used in electric machines in diagnostics of condition of rotor casing. Method of eddy current testing additionally includes stages, at which monitoring of the electrical machine rotor bandage shell in the form of a hollow cylinder of carbon fiber is performed, the eddy current converters are made in the form of additional coils located on edges of the stator teeth, wherein the eddy current converters combine operation of the magnetic field source and the magnetic field variation sensor, excitation of the eddy currents in the bandage shell is carried out by the alternating magnetic field by supplying high-frequency alternating voltage to eddy current converters which does not coincide with the frequencies of the spatial and time harmonics of the electrical machine, when high-frequency alternating voltage is disconnected in eddy current converters, the values of induced high-frequency electromotive forces are recorded, which correspond to change of magnetic fields caused by eddy currents, from which defect value is determined.

EFFECT: technical result is higher reliability of diagnosing values of defects of bandage shells of carbon fiber, high reliability during operation of electrical machines.

1 cl, 1 dwg