Abstract:Taking the large-scale mining excavator with variable frequency speed regulation system as the research object, the mechanical coupling between the two hoisting motors of the electric shovel is introduced in this paper. So the Torque MASTER-slave control method is adopted between the two inverters, in which the master device (MASTER) is the speed control, the slave device (SLAVE) is torque control, so that the lifting mechanism not only realizes speed control, but also ensures the output balance between the two motors working principle. The possible causes of out-of-control hoisting and the countermeasures are analyzed to ensure the reliable operation of the equipment.