External rotor motor capable of preventing metal scraps from entering controller

The utility model discloses an external rotor motor capable of preventing metal chips from entering a controller, which comprises a motor single body and the controller, the motor single body comprises a stator assembly, an external rotor sleeved outside the stator assembly and a metal sleeve seat, the metal sleeve seat comprises an end plate and a sleeve protruding upwards from the middle position of the end plate, and the controller is arranged on the end plate. The stator assembly is sleeved outside the sleeve, the controller comprises a control box and a circuit board installed in the control box, the edge position of the end plate protrudes downwards to form an annular boss, the annular boss is supported on the end face of the control box, a plurality of screw holes distributed at intervals in the circumferential direction are formed in the annular boss, and a plurality of through holes corresponding to the screw holes are formed in the control box. Screws penetrate through the through holes and then are