External rotor motor

An external rotor motor, comprising a rotation shaft (1), a stator assembly (2), an external rotor assembly (3), and a bearing seat (4), wherein the bearing seat (4) comprises a bottom plate (41) and a sleeve (42) protruding upward from the center of the bottom plate (41), a bearing (43) is mounted inside the sleeve (42), the rotation shaft (1) is supported on the bearing (43), the stator assembly (2) is sheathed and mounted on an exterior of the sleeve (42), the external rotor assembly (3) is sleeved around an exterior of the stator assembly (2), the external rotor assembly (3) comprises a housing (31), the housing (31) comprises a top plate (311) and a cylindrical side plate (312) that are connected together, a plurality of permanent magnets (32) are mounted on an inner wall surface of the cylindrical side plate (312), the top plate (311) and the cylindrical side plate (312) enclose a cavity (310), the stator assembly (2) is located in the cavity (310), an end of the rotation shaft (1) is connected to the top plate (311), and an upper end portion fan (33) and a lower end portion fan (34) are respectively mounted on an upper side and a lower side of the permanent magnets (32);

• the upper end portion fan (33) comprises an upper wind shield (331) and a plurality of upper guide vanes (332) protruding from the upper wind shield (331), an upper central hole (333) is provided at the center of the upper wind shield (331), and the plurality of upper guide vanes (332) are circumferentially distributed around a partial circumference of a periphery of the upper central hole (333);
• the lower end portion fan (34) comprises a lower wind shield (341) and a plurality of lower guide vanes (342) protruding from the lower wind shield (341), a lower central hole (343) is provided at the center of the lower wind shield (341), a plurality of ventilation holes (344) are further provided in the lower wind shield (341), and the plurality of ventilation holes (344) and the plurality of lower guide vanes (342) are circumferentially distributed around a periphery of the lower central hole (343);
• and
• the plurality of upper guide vanes (332) and the plurality of lower guide vanes (342) both face the stator assembly (2) and are staggered in a circumferential direction, so that when the upper end portion fan (33) and the lower end portion fan (34) rotate together with the external rotor assembly (3), air circulation is formed between an upper end and a lower end inside the motor to accelerate cooling.