Magnetic attraction wheel of tunnel robot

A magnetic attraction wheel of a tunnel robot comprises cover assemblies, the number of the cover assemblies is two, the cover assemblies are arranged in a bilateral symmetry mode, and a coil winding base and a brushless motor driver are installed between the cover assemblies. The cover assembly comprises a power input terminal, a fixing support, a bearing, a cover and a power output terminal, a bearing inner ring of the bearing is in clearance fit with an outer ring of the fixing support, a bearing outer ring of the bearing is in clearance fit with an inner ring of the cover, and the power input terminal is installed at the end, away from the bearing, of the fixing support. The coil winding base is provided with a power input terminal and a power output terminal, the power input terminal is electrically connected with the power output terminal, one end, facing the coil winding base, of the power output terminal is electrically connected with the brushless motor driver, and the brushless motor driver provides