Slewing control system, voltage deviation control method, construction machinery including the system

A slewing control system for a construction machinery, comprising a generator (G) and at least one motor (M1, M2) connected in series within a circuit loop, wherein the at least one motor (M1, M2) is configured to drive the slewing mechanism of the construction machinery to perform a respective operation based on the electrical energy provided by the generator (G), characterized in that the system further comprises a master controller (CPG), at least one slave controller (CPM1, CPM2), and a plurality of feedback units (DM1, DM2, DG), wherein:

• the master controller (CPG) is configured to receive an operation command from a user on the slewing handle and provide corresponding excitation current to the generator (G) based on the operation command, the master controller (CPG) is further configured to send the operation command to the at least one slave controller (CPM1, CPM2),
• the at least one slave controller (CPM1, CPM2) corresponds one-to-one with the at least one motor (M1, M2) and is configured to adjust the excitation magnetic field of the respective motor (M1, M2) based on the operation command from the master controller (CPG), the at least one motor (M1, M2) is configured to drive the slewing mechanism of the construction machinery to perform a corresponding operation based on the armature current generated by the generator under the influence of the excitation magnetic field,
• the plurality of feedback units (DM1, DM2, DG) correspond one-to-one with the at least one motor (M1, M2) and the generator (G), and are used to detect the operation parameters of the respective motor (M1, M2) or generator (G) and feedback the detection results to the master controller (CPG), the master controller (CPG) is further configured to adjust the excitation current provided to the generator (G) based on the detection results from the plurality of feedback units.