Motor shell, manufacturing method of motor shell, and electric fan

An electric fan, comprising:

• a rotor assembly, comprising a shaft core, a magnetic member, one or more fan blades, and a motor shell, wherein the motor shell comprises an outer shell and a connecting part;
• the outer shell comprises a holding cavity, and an opening at one end of the holding cavity, the connecting part is provided on and extending from a bottom wall of the holding cavity, an extension direction of the connecting part is being parallel to an axial direction of the outer shell, the connecting part comprising a matching surface is at one end of the connecting part away from the bottom wall of the holding cavity;
• a tolerance of a flatness of the matching surface along the axial direction of the outer shell is less than 0.03 mm;
• the outer shell comprises a through hole, the connecting part further comprises a ring plate extending from an edge of the through hole away from the bottom wall of the holding cavity;
• a surface of an end of the ring plate away from the bottom plate is the matching surface;
• the ring plate comprises a mounting hole configured to fix one end of a shaft core of the rotor assembly, the inner ring of the bearing is connected to an outer peripheral surface of the shaft core and abuts against the matching surface;
• one end of the shaft core extends through the connecting part along the axial direction of the outer shell, the magnetic member is arranged on a side wall of the holding cavity, the one or more fan blades are arranged on a peripheral side of the outer shell;
• a bearing, wherein the matching surface is configured to abut against an inner ring of the bearing, the inner ring of the bearing is connected to an outer peripheral surface of the shaft core and abuts against the matching surface;
• a support member, arranged on an outer peripheral surface of an outer ring of the bearing;
• and
• a stator assembly, arranged on an outer surface of the support member.