Method of in slot tightness measuring of stator coil
AssigneeSiemens Energy, Inc.
InventorsBenjamin T. Humphries, Constance M. Smith, James F. Lau
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Abstract
A method for measuring a tangential tightness of a stator coil within an armature slot of a stator assembly in an electric generator. The stator coil is excited to produce a vibratory response therein. The vibratory response of the stator coil is detected and a frequency response function of the vibratory response is determined. A tangential tightness of the stator coil within the armature slot is estimated based on the frequency response function of the vibratory response of the stator coil.
Claims20
A method for measuring a tangential tightness of a stator coil within an armature slot of a stator assembly in an electric generator comprising:
- exciting said stator coil to create a vibratory response of said stator coil;
- detecting said vibratory response of said stator coil;
- determining a frequency response function of said vibratory response of said stator coil;
- and
- estimating a tangential tightness of said stator coil within said armature slot based on said frequency response function of said vibratory response of said stator coil.
A method for measuring a vibratory response of a stator coil to estimate a tangential tightness of said stator coil within an armature slot of a stator assembly in an electric generator comprising:
- removing at least one of a stator wedge, a top slot filler, and a top ripple spring from said armature slot;
- exciting said stator coil by directly impacting a radially inner side of said stator coil with an exciter having a load cell to create a vibratory response of said stator coil, said vibratory response comprising one of a tangential vibratory response and a radial vibratory response;
- detecting said vibratory response of said stator coil;
- determining a frequency response function of said vibratory response of said stator coil;
- and
- estimating a tangential tightness of said stator coil within said armature slot based on said frequency response function of said vibratory response of said stator coil.
A method for reducing spark erosion of a stator coil in an armature slot of an electric generator comprising:
- exciting said stator coil to create a vibratory response of said stator coil;
- detecting said vibratory response of said stator coil;
- determining a frequency response function of said vibratory response of said stator coil;
- estimating a tangential tightness of said stator coil within said armature slot based on said frequency response function of said vibratory response of said stator coil;
- and
- inserting at least one filler member between said stator coil and a wall defining said armature slot if said estimated tangential tightness of said stator coil within said armature slot is not within a predetermined range.
Dependencies are inferred from the claim text.