The transmission mode of the balancing machine dragging the rotor is a belt drag, a coupling drag and a self-driving. The belt dragging is to use a rubber endless belt or a wire-woven endless belt, and the rotor is dragged by the motor pulley. Therefore, the belt dragging requires that the surface of the rotor must have a smooth cylindrical surface, and the advantage of the belt dragging is that the unbalance of the rotor is not affected. The balance accuracy is high. Coupling dragging is the use of a universal joint to connect the balancer spindle to the rotor. Coupling drag is characterized by an irregular rotor, which can transmit a large torque. It is suitable for dragging a rotor with a large wind resistance such as a fan. The disadvantage of coupling dragging is that the unbalance of the coupling itself will be The rotor has an effect (so that the coupling is balanced before use), and the accuracy of the disturbance is also introduced. In addition, a large number of lands are needed to accommodate different types of rotors. Self-driving is the rotation of the rotor itself. Self-driving is the drag method that has the least influence on the balance accuracy, and the balance accuracy can be the highest, but only the special rotor allowed by the structure can use this drag mode.