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Introduction to the formation process of rotor imbalance: Rotor imbalance can be classified into initial imbalance, progressive imbalance, and sudden imbalance based on its formation process. Initial imbalance is caused by factors such as manufacturing errors, assembly errors, uneven material properties, and imbalance within the assembled components. During the first trial run of the equipment, the vibration amplitude is high. Assembly errors generally refer to excessive clearance; for example, if the bore diameter of pulleys, half-couplings, fan rotors, or pump impellers is larger than the shaft diameter, and these components are fixed using keys or bolts, the excessive clearance causes the rotor’s center of gravity to shift to one side of the rotation axis, resulting in imbalance. This is why it is important to perform dynamic balancing as soon as possible after the rotor has been fully assembled. Progressive imbalance is caused by uneven scaling, corrosion, erosion of the rotor due to the medium, as well as wear of the rotor itself. It is characterized by an increase in vibration levels over time as the equipment operates longer. Sudden imbalance occurs when components on the rotor become damaged and fall off, or when foreign objects get trapped on the rotor. This leads to a sudden and significant increase in vibration levels, which then remain at a new level higher than the original value; the vibration level remains relatively constant when the speed of the rotor does not change. Regarding the issue of rotor imbalance, on-site dynamic balancing correction services are required to resolve it; for more details, please contact Kunshan Lita Testing Instruments Co., Ltd.