A ceiling fan assembly having a motor assembly with a rotating blade hub, and at least one fan blade mounted to the rotating blade hub with a blade span defined between a tip and a root, and defining an airfoil cross section including a rounded leading edge and a v-shaped trailing edge defining a chord therebetween. The blade comprising a pressure side surface and a suction side surface extending between the leading and trailing edges and including a hollow interior and including a tip opening at the tip and a root opening at the root for accessing the hollow interior. The at least one fan blade includes a thickness to chord ratio of less than about 15%.

A ceiling fan including a retention system and method of redundantly retaining a ceiling fan can include a ceiling fan motor assembly including a hollow motor shaft at least partially surrounded by a motor housing. A retainer plate is provided at the bottom of the motor housing including an opening. A retainer rod extends through the opening in the retainer plate and secures to the retainer plate. A support cable couples to the retainer rod to suspend the retainer plate from a structure, wherein the retainer plate is configured to redundantly retainer the ceiling fan.

A ceiling fan assembly having a motor assembly with a rotating blade hub, and at least one fan blade mounted to the rotating blade hub with a blade span defined between a tip and a root, and defining an airfoil cross section including a rounded leading edge and a v-shaped trailing edge defining a chord therebetween. The blade comprising a pressure side surface and a suction side surface extending between the leading and trailing edges and including a hollow interior and including a tip opening at the tip and a root opening at the root for accessing the hollow interior. The at least one fan blade includes a thickness to chord ratio of less than about 15%.

A blower device includes a rotor rotatable about a central axis extending in a vertical direction, an impeller attached to the rotor, and an annular ring centered on the central axis. The rotor includes a rotor cylindrical portion that extends in the axial direction and a flange that extends radially outward from the rotor cylindrical portion. The impeller includes an annular impeller base centered on the central axis. The ring is connected to the impeller base in the axial direction. The flange is held between the impeller base and the ring in the axial direction.

An arrangement of an impeller (1) on an electrical motor, in particular on an external rotor motor (8), whereby the torque of the motor is transferred to the impeller (1) by means of a torsion-proof connection between the rotor (8) of the motor and the impeller (1) and/or its impeller hub (3), is characterised in that the connection of the impeller (1) to the motor (8) results from physical and/or chemical interactions between an adhesive medium (10) and the contact surfaces (5) of the impeller hub (3) and of the motor (8), which face each other, whereby the adhesive medium (10) fills, at least partially, an intermediate space (9) that is formed between the impeller (1) and the motor (8) by the given play.

A brushless motor has a stator and an outer rotor. The stator includes a stator core having 6N teeth and 6N coils wound respectively around the teeth where N is an integer equal to or greater than 1. The rotor includes 6N±2 permanent magnets. The permanent magnets are arranged circumferentially around the stator core and face the teeth across an air gap. The radial thickness of the air gap is uneven along the circumferential direction of the motor.

A fan impeller includes a hub, a shaft, a metal housing and a plurality of blades. The outer periphery of the hub has a curved surface. The shaft is disposed in the hub and connected to the hub. The metal housing has an annular shape and is disposed in the hub. A magnetic ring is disposed at the inner side of the metal housing. The blades are disposed around the outer periphery of the hub. The blades are projected along an extension direction toward the shaft to define projection areas thereof, and the projection area of a top and a bottom of any one of the blades is partially overlapped with other two adjacent blades. A distance between an outer edge of each blade and a rotational axis of the fan decreases proximate the top of the blade and then increases towards the bottom of the blade.

A ceiling fan assembly a motor assembly having a non-rotating, hollow, motor shaft, a stator winding carried by the motor shaft, a wiring harness passing through the hollow of the motor shaft and electrically coupled to the stator winding.

An arrangement of an impeller (1) on an electrical motor, in particular on an external rotor motor (8), whereby the torque of the motor is transferred to the impeller (1) by means of a torsion-proof connection between the rotor (8) of the motor and the impeller (1) and/or its impeller hub (3), is characterised in that the connection of the impeller (1) to the motor (8) results from physical and/or chemical interactions between an adhesive medium (10) and the contact surfaces (5) of the impeller hub (3) and of the motor (8), which face each other, whereby the adhesive medium (10) fills, at least partially, an intermediate space (9) that is formed between the impeller (1) and the motor (8) by the given play.

An ceiling fan comprising a motor system. The motor system is mounted around a motor shaft. The motor shaft couples to a downrod for suspending the ceiling fan from a structure. The motor shaft and motor are encased by a motor housing. The motor housing comprises hub arms for mounting a plurality of blade holders. The blade holders coupled to a plurality of blades rotatable about the motor during operation. The downrod comprises a wire disk mounting guy wiring to the downrod. A retention rod is utilized internal of the motor and downrod as a secondary retention method. An electrical connector is internal of the motor shaft and electrically couples to the stator to power the motor.