In general, the rotor should be designed to make the balancing operation simple and correct, but also consider the issues of processability, number of processes and cost. For designers, everyone wants to achieve a higher balance of quality levels, but blindly required quality levels will not only increase costs, reduce efficiency, but too high requirements are often a waste, because of the use of the rotor From a performance standpoint, most require only a certain level of balance quality to be sufficient. In addition, even if the single rotor is well balanced, the eccentricity of the bearing portion, etc., will bring about a new imbalance due to the fitting clearance during assembly. Considering the above situation, the excessive pursuit of high precision is meaningless. In the Japanese industrial standard JISB 0905 <balance quality of rotating machinery>, the standard of allowable imbalance is given in the form of a reference table, and the reader is expected to refer to it. The values ​​in the table are given for the general case. For each specific specific rotor, the inherent characteristics of each rotor should be considered and the level of balance quality should be determined based on experience and experimental data.

As described above, the smaller the imbalance correction amount, the less likely the correction error is to be generated, and the correction operation is also simple and easy. Therefore, the distance between the two correction planes should be as large as possible, and the correction radius should be as large as possible.

In order to balance, the drive couplings are used, the jigs are connected, and the mandrel is assisted. Attention must be paid to the imbalance between the gaps and the eccentricity between them and the rotor. A new imbalance is created by the asymmetry of the mounting portion or the mounting of the rotor to the eccentrically fitted portion due to the clearance of the mating portion. In addition, in the rotor in which the rolling bearing is mounted, since the inner ring of the rolling bearing must have an eccentricity, this influence cannot be ignored. The above problems should be understood by the operator, but if the designer does not fully understand the balance process and design the rotor, it will bring a series of problems to the rotor balance.