Direct-drive winch system of single alternating-current variable-frequency asynchronous motor of drilling machine

The invention relates to a direct-drive winch system of a single alternating-current variable-frequency asynchronous motor of a drilling machine. The problems that an existing winch is complex in structure and high in fault rate are mainly solved. The direct-drive winch system is characterized in that the alternating-current variable-frequency asynchronous motor (1) drives a roller assembly (3) through a coupler (2); and the winding parameters of the alternating-current variable-frequency asynchronous motor (1) include that the stator slot number Z is equal to 72, the parallel connection path number a is equal to 4, the motor pole number 2P is equal to 12, the each-pole and each-phase slot number q is equal to 2, the winding polar distance tau is equal to 6, the coil pitch Y is equal to 5, the rotor slot number is equal to 48, the stator coil turn number is 21, and a connecting manner is Y connection. A speed reduction box of the original winch and a lubrication system of the speed reduction box are removed in the direct-drive winch system of the single alternating-current variable-frequency asynchronous motor of the drilling machine, the alternating-current variable-frequency motor direct-drive winch is adopted, the structure is simple, the work efficiency is improved, and the fault rate is reduced.