Tool for assisting dynamic balance test of motor rotor

The utility model discloses a tool for assisting a dynamic balance test of a motor rotor. The tool comprises a tool shaft and a tool flange. The tool shaft is sleeved with the tool flange. The tool flange comprises a center hole, a spigot and a rotor mounting hole; the tool shaft is arranged in the center hole in a penetrating mode. The spigot is arranged on one side of the tool flange, is coaxial with the central hole and is used for mounting and positioning a motor rotor; the rotor mounting holes are uniformly arranged around the central hole and the seam allowance; wherein finish machining of the spigot needs to be completed before the tool flange is arranged on the tool shaft in a sleeving mode. According to the tool for assisting the dynamic balance test of the motor rotor, finish machining of the spigot on the tool flange can be completed firstly, and then the tool flange is installed on the tool shaft, so that the assembly precision of the motor rotor and the tool is ensured. 本实用新型公开了一种辅助电机转子动平衡试验的工装，包