Solutions only

Stator core &
end-winding vibrations

stator core end-winding

Stator core

Stator core vibrations measurements are conducted using accelerometers or velocity meters positioned around the stator core, typically in radial directions on each segment.

Stator core image
  • Faults and conditions detected

  • Loose stator core (or segment joints)

  • Stator stiffness change in operation

  • Typical configuration

  • Accelerometers positioned around stator core (typically 3-6 sensors per unit)

  • CoDiS RT – on-line monitoring and protection instrument

  • CoDiS DM – on-line and off-line diagnostic software


END-WINDING

Stator end winding vibrations measurements are conducted using fiber optic accelerometers positioned around the stator core, typically in radial (also tangential) directions on end winding. Bump test is recommended to identify the best sensors location

stator core and end winding vibrations
  • Faults and conditions detected

  • Looseness of the end-winding support and tie structure due to mechanical aging and thermal expansion

  • Resonance conditions close to the primary mechanical forces of rotational frequency and twice the AC line frequency

  • Relative motion between one component and another which can abrade the high voltage insulation on the coils

  • Typical configuration

  • EVAII positioned around stator on end windings (typically 3-6/12 sensors per unit)

  • CoDiS RT – on-line monitoring and protection instrument

  • CoDiS DM – on-line and off-line diagnostic software