External rotor motor fan with integrated bearing housing and box for control electronics

TLDR: In this paper, an electronically commutated external rotor motor is used to drive a fan with a permanent magnetically acting air gap, where the rotor is separated from the internal stator by a magnetically-acting air gap.

Abstract: A fan has an electronically commutated external rotor motor which is used to drive it. This motor has an internal stator (20) with a laminated stator core (64) and with a winding arrangement (66; 164, 166, 168, 170) associated with it. The internal stator has a central recess (149) for bearing a shaft (42). The fan furthermore has a permanent-magnet rotor (28), which is separated from the internal stator (20) by a magnetically acting air gap (99), is provided on its outside with fan blades (32) and has a shaft (42) which is borne in the central recess (149) in the internal stator (20). A plastic coating (56, 58) is also provided, and extends into the central recess (149) in the internal stator (20), where it forms a bearing tube for holding bearing elements (48, 50), for bearing the shaft (42), furthermore having a wall element (62), which is formed integrally with this plastic coating (56, 58), for a cavity (108) for holding electrical components (112) of the motor, which wall element (62) is provided on that side of the laminated stator core (64) which faces away from the rotor (28), and a fan housing (24), which is integrally connected by connecting elements (134, 136) to the wall element (62) of the cavity (108) and, together with the rotor (28), forms an air passage channel (142), into which the fan blades (32) project.