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Rotor Bar Testing – Visual Inspection

Test Overview

Visual inspection of a rotor is likely the first step in the diagnosis of a possible rotor defect. When a rotor is pulled from the stator, it should be inspected for obvious faults. Common visible defects, such as those listed below, should trigger further testing of the rotor.

  • Visible cracks in bar-to-end-ring joint
  • Visible points of contact with stator
  • Isolated discoloration of rotor surface
  • Excessive concentration of balance weights
  • Cracked end rings
  • Shifted or separated rotor laminations

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