1, the motor rotor balancing machine is needed based on single-sided or double-sided calibration correction to roughing balancing machines. Generally, when the ratio of length to diameter required to check at ≥5 rotor, select duplex balancing machines; on the contrary, selecting single balancing machines. 
2, if it is determined to be made double-sided rotor balancing is then used to further determine the balancing machine according to the maximum diameter of the rotor, the maximum length and weight, if one side of the rotor to be corrected, shall be based on the weight of the rotor, the diameter of the function to select a single balancing machines, balancing machines can sometimes be double-sided. 
3, with a minimum residual unbalance Uper rotor balancing machine with up to unbalance Umar for comparison. a) When Uper> Umar, the balancing machine choose correctly. Uper value of the rotor can be calculated according to the formula in front, no rotor Uper value can not be the right choice for balancing machines. b) When the minimum Umar> Uper, indicating the existing universal balancing machines can not meet the requirements of such a rotor balancing the need to redesign or restructuring into a special balancing machine, sometimes supported by way of a special rotor balancing machines also need restructuring. 
4, the rotor (work) residual unbalance, codenamed Uper --- After balancing the rotor, allowing the remaining unbalance, unit: g.mm.
5, balancing machine minimum achievable residual unbalance, code-named Umar --- when balancing machine calibration standard calibration rotor balancing machine minimum measurable amount of unbalance, unit: g.mm.