Why does the coupling unbalance appear?

　　CouplingSome problems may occur during use, such as the unbalance of the rotor.The phenomenon of unbalanced centrifugal inertial force, centrifugal inertial couple force and dynamic deflection (vibration shape) during operation is called the unbalanced phenomenon of the rotor.The factors that cause rotor imbalance are nothing more than rotor shape asymmetry, manufacturing and installation errors, and material unevenness.

　　This situation should be resolved in the design stage by calculating the balance mass.The last two items can only be determined by determining the size and orientation of the rotor imbalance on the balance machine or by discovering the field balance, and then determining the radius and orientation of the balance mass, and adding or subtracting the balance mass to balance.

　　CorrectedCouplingThe possible unbalanced factors include the following aspects:

　　First, the unbalance caused by uneven or unsymmetrical distribution of accessories (threaded connections, keys, and shaft end pressure plates) in the coupling.

　　The second is the imbalance caused by the manufacturing tolerances specified in the design specifications of the coupling body parts (semi-couplings, etc.).

　　Third, the unbalance caused by the eccentricity between the coupling and the shaft (the cylindricity of the shaft hole and its coaxiality with the outer edge).

　　Fourth, the gap between matching parts in the coupling.

　　Fifth, the unbalance caused by uneven material or uneven wear of each part of the coupling.