Abstract:
A device (56) for removing a coating formed in a slot (88) of a stator core (58) comprising a carriage assembly (10) including a nozzle (12) for spraying blasting media. The carriage assembly (10) is movably attached to a guide rail assembly (59) to enable movement of the carriage (24) in a longitudinal direction. The device (56) also includes a drive screw (76) wherein rotation of the drive screw (76) moves the carriage assembly (10) in the longitudinal direction. In addition, the device (76) includes another guide rail assembly (16) that is attached to the carriage (24) wherein said guide rail assembly (16) enables movement of the nozzle (12) in a direction transverse to the longitudinal direction. Further, the device includes another drive screw (32) wherein rotation of said drive screw (32) moves the nozzle (12) relative to the carriage (24) along the transverse axis (23).
Abstract:
In a general methodology for insulation defect identification in a generator core, a Chattock coil is used to measure magnetic potential difference between teeth. Physical knowledge and empirical knowledge is combined in a model to predict insulation damage location and severity. Measurements are taken at multiple excitation frequencies to solve for multiple characteristics of the defect.