Laminating the insulated membrane equipped electromagnetic steel sheet, it is the diagnostic device which diagnoses the looseness of the stator core 1 where it tightens in axial direction, inserts coil 2 in the coil insertion space inside, connects coil 2 at outside and forms. When exciting stator core 1 the excitation expedient with the vibrating detection sensor 6 which detects the vibration of radial of 7 which excites stator core 1 in radial and stator core 1 and excitation expedient 7, frequency analyzing the output signal of the vibrating detection sensor 6 which detects the vibration which occurs in stator core 1 with vibrating detection sensor 6 the specific mode of vibration extraction expedient the characteristic where presumes the presumption specific mode of vibration of annular mode of the stator core from the form data of 22 which extracts the measurement specific mode of vibration of annular mode of the stator core and stator core 1The decision result output expedient 29 which decides the tightening condition of stator core 1 from comparison with the criterion which can of mode of vibration presumption expedient on the basis 26 and measurement specific mode of vibration and presumption specific mode of vibration and, it possesses.
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