STATOR CORE LOOSENING DIAGNOSIS DEVICE AND STATOR CORE LOOSENING DIAGNOSIS METHOD

摘要

Provided is a diagnosis device for diagnosing loosening of a stator core (1) configured by layering electro-magnetic plates having an insulation film, clamping them in the axial direction, inserting a coil (2) in a coil insert space arranged inside, and connecting the coil (2) outside. The diagnosis device includes: excitation means (7) for vibrating the stator core (1) in the radial direction; a vibration sensor (6) for detecting vibration in the radial direction of the stator core (1); natural vibration mode extraction means (22) for frequency-analyzing an output signal of the vibration sensor (6) which has detected vibration generated in the stator core (1) when the stator core (1) is vibrated by the excitation means (7) and extracting the measured natural vibration mode of an annular mode of the stator core; natural vibration mode estimation means (26) for estimating the estimated natural vibration mode of the annular mode of the stator core from the shape data on the stator core (1); and judgment result output means (29) for judging the clamping state of the stator core (1) by comparing the measured natural vibration mode and the judgment reference obtained according to the estimated natural vibration mode.