US Patent 11108298 Motor

A motor includes a shaft, a bearing, an armature, a bracket, and a covered cylindrical rotor including a rotor lid portion, a rotor side wall portion, and a rotor magnet. The bracket includes a cylindrical portion. The bearing includes lower and upper ball bearings. The shaft includes a shaft main body and a nut. In the lower ball bearing, a lower surface of an inner ring is in contact with an upper surface of the nut and an upper surface of an outer ring is vertically supported by the cylindrical portion. In the upper ball bearing, an inner ring is vertically fixed with respect to the shaft main body and a lower surface of an outer ring is vertically supported by the cylindrical portion.