Sources of Imbalance
The following machine problems are among the conditions that will create imbalance:
Uneven dirt accumulation on fan rotors
Lack of homogeneity in cast parts, such as bubbles, blow-holes, porous sections
Rotor eccentricity
Roller deflection, especially in paper machines
Machining errors
Uneven mass distribution in electric motor rotor bars or windings
Uneven erosion and corrosion of pump impellers
Missing balance weights
Bowed Shaft
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