Motor

A motor comprising:

• a shaft centered on a center axis oriented in a vertical direction;
• a bearing rotatably supporting the shaft;
• an armature disposed radially outward of the bearing;
• a bracket to which the bearing and the armature are fixed;
• and
• a covered cylindrical rotor connected to the shaft;
• wherein the rotor includes:
• a disk-shaped rotor lid portion connected to the shaft;
• a rotor side wall portion extending downward from an outer edge of the rotor lid portion;
• and
• a rotor magnet radially opposed to the armature radially outward of the armature and indirectly or directly fixed to an inner peripheral surface of the rotor side wall portion;
• the bracket includes a cylindrical portion including an outer peripheral surface to which the armature is fixed and an inner peripheral surface to which the bearing is fixed;
• the bearing includes:
• a lower ball bearing supporting a lower portion of the shaft;
• and
• an upper ball bearing disposed higher than the lower ball bearing to support the shaft;
• the shaft includes:
• a shaft main body including a male screw portion projecting downward from the lower ball bearing at a lower end portion of the shaft main body;
• and
• a nut attached to the male screw portion;
• a lower surface of an inner ring of the lower ball bearing is in contact with an upper surface of the nut;
• an upper surface of an outer ring of the lower ball bearing is vertically supported by the cylindrical portion;
• an inner ring of the upper ball bearing is vertically fixed with respect to the shaft main body;
• and
• a lower surface of an outer ring of the upper ball bearing is vertically supported by the cylindrical portion via an elastic member.