A motor apparatus having a high efficiency and reducing manufacturing cost by using a cost effective ferrite permanent magnet includes a rotatable shaft, a fan connected to one side of the shaft to generate a flow of air, a stator including stator cores arranged in a circumferential direction, and a coil wound around the stator core, and a rotor disposed at an inside of the stator and provided in a form of a cylinder having a passage allowing the shaft to pass through the rotor includes a rotor core provided with a protrusion structure and one or more ferrite magnets coupled to the rotor core to provide a magnetic force. By using a ferrite magnet, when compared to a conventional universal motor, a superior efficiency is obtained, and when compared to a BLDC motor using a Nd magnet, a low cost BLDC motor is implemented.

A fan device includes a driving device, a fan wheel, and a locking fastener. The driving device includes a shaft. The fan wheel defines a shaft hole to receive the shaft. The locking fastener has a thermal expansion coefficient same as a thermal expansion coefficient of the shaft

A fan includes: a shaft including an outer peripheral surface that includes a first circular-arc portion, and a first flat portion; and a boss portion including a fitting hole with an inner peripheral surface that includes a second circular-arc portion, and a second flat portion. The second circular-arc portion corresponds to the first circular-arc portion. The second flat portion corresponds to the first flat portion. One or both of the first flat portion and the second flat portion includes a notch in an end portion in a width direction of the one or both of the first flat portion and the second flat portion.

In the application disclosed are a wind shroud, which is used in a fan with a movable impeller, and a fan with the same. The wind shroud is integrally formed and comprises a body configured to be internally hollowed in an axial direction of the body for receiving the movable impeller. The body comprises an air inlet end and an air outlet end, and the air inlet end has an inner sidewall and an outer sidewall spaced apart from each other to form a silencing cavity for buffering the vibration generated when the movable impeller is rotated, so as to reduce the noise of the fan. In a direction from the air inlet end to the air outlet end, a distance between the inner sidewall of the air inlet end and the outer sidewall of the air inlet end first gradually increases, and then gradually decreases. In the above manner, where the wind shroud of the present application is applied to a fan, the noise problem of the fan can be effectively addressed.

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 method including bending an elongate portion of a flat strip of metallic material into a ring about an axis extending parallel to a thickness of the elongate portion of the strip of metallic material. The method includes fixing end portions of the ring together to form a flat ring, the flat ring having opposite flat side surfaces, a radially inner surface, a radially outer surface, a pair of radially inner edges, and a pair of radially outer edges, wherein the pair of radially inner edges connect the radially inner surface and the opposite flat side surfaces and the pair of radially outer edges connect the radially outer surface and the opposite flat side surfaces. The method includes connecting a plurality of curved blades to the flat ring and connecting a hub support to the curved blades at a position spaced from the flat ring along the curved blades.

A detachment mechanism for a fan is provided for being adapted for a fan structure, the fan structure includes a rotating axle and a blade assembly, the blade assembly is sleeved on the rotating axle, and the detachment mechanism for the fan includes a detachment threaded hole. The detachment threaded hole is configured for a detachment bolt to be rotatably screwed therewith, the detachment threaded hole penetrates through the detachment mechanism for the fan, and a part of the rotating axle is exposed from an opening area of the detachment threaded hole.

A motor for dual fans includes: a body on which a stator is installed; a shaft which is coupled to a rotor located to be opposite to the stator to rotate together and is extended to an upper part and a lower part of the body; a first fan which is coupled to an upper part of the shaft; and a second fan which is coupled to a lower part of the shaft, characterized in that a first unidirectional bearing is coupled to the first fan, and thereby an inner race of the first unidirectional bearing is coupled to an upper part of the shaft to rotate, and a second unidirectional bearing is coupled to the second fan, and thereby an inner race of the second unidirectional bearing is coupled to the lower part of the shaft to rotate.

A detachment mechanism for a fan is provided for being adapted for a fan structure, the fan structure includes a rotating axle and a blade assembly, the blade assembly is sleeved on the rotating axle, and the detachment mechanism for the fan includes a detachment threaded hole. The detachment threaded hole is configured for a detachment bolt to be rotatably screwed therewith, the detachment threaded hole penetrates through the detachment mechanism for the fan, and a part of the rotating axle is exposed from an opening area of the detachment threaded hole.

In one aspect, a fan assembly is provided that can be manufactured while producing a significantly reduced amount of scrap material. More specifically, the fan assembly utilizes a hub ring and one or more hub strips to support a plurality of blades rather than a solid center disc or end disc used by some prior approaches. In another aspect, a method is provided that includes bending a member into an annular configuration and joining end portions of the member together to rigidly fix the member in the annular configuration. The rigid annular member may be used as an end ring, a hub ring, an orifice, or other component, while producing significantly less scrap material than traditional approaches.