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Base support and alignment: How understanding construction of the frame can help minimize motor vibration

Publication date: 
February 2008
Chuck Yung, EASA Senior Technical Support Specialist

When 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 we should examine is the base/foundation of the motor. If the high vertical readings are compounded by indications of an eccentric airgap, such as high axial vibration and a predominant twice-line-frequency vibration, a "soft foot" or twisted frame is often to blame.