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Motor base support and alignment: A basic understanding of frame construction can help minimize motor vibration

Plant Engineering
Publication date: 
October 2013
Chuck Yung, EASA Senior Technical Support Specialist

When motor vibration problems occur, the magnitude and direction of the vibration can give a good indication of where to look for the cause. When vibration is higher in the vertical plane, one of the first things to examine is the base/foundation of the motor. If the high vertical readings are compounded by indications of an eccentric air gap, such as high axial vibration and a predominant twice-line-frequency vibration, a “soft foot” or twisted frame is often to blame.

Topics covered include:

  • Construction basics
  • Frame bulkheads
  • Minimizing vibration
  • Avoiding frame distortion
  • Checking the soleplate