Electric motor assembly and hair dryer having the same

Abstract

The invention relates to an electric motor assembly and hair dryer having the same. An electric motor assembly includes an impeller; an outer housing in which the impeller is accommodated; an inner housing, which is arranged in one side of the impeller in the outer housing and is concentric with the outer housing; a stator having one side thereof accommodated in the inner housing; a rotor provided with a rotating shaft having one end coupled to the impeller and rotatably accommodated in the stator; a first bearing, which is disposed at one side of the rotor along the axial direction and supports the rotating shaft; a second bearing, which is disposed at another side of the rotor along the axial direction and supports the rotating shaft, and a bracket, which is arranged on the other side of the rotor along the axial direction wherein the inner surface of the bracket is coupled to the stator and the outer surface of the bracket is coupled to the outer housing. The first bearing is arranged in the inner housing. The second bearing is arranged on the bracket. The external size can be prevented from increasing excessively through the technical scheme mentioned above. Accordingly, initial alignment of the stator and the rotor may be securely maintained.

Description

technical field [0001] The present invention relates to a motor assembly (Motor Assembly) and a hair dryer equipped with it. Background technique [0002] As we all know, a motor is a device that converts electrical energy into mechanical energy. A motor includes a stator and a rotor configured to be rotatable relative to the stator. [0003] These motors are manufactured in various sizes and weights according to the application. [0004] Among the motors, reduction in size and weight of motors applied to so-called handheld devices or handheld devices (hereinafter, referred to as "handheld devices") that are used by holding them in the hand is particularly required. [0005] A motor applied to the above-mentioned hand-held device, for example, a motor applied to a hair dryer and / or a vacuum cleaner, is mainly composed of a motor assembly having an impeller. [0006] As far as the motor assembly used for the hand-held device is concerned, the key is to reduce the size and ...

AI Technical Summary

Problems solved by technology

[0007] However, with such a conventional motor assembly of a handheld device, there is a problem in that there is a limit in increasing the coupling force due to the relatively small size of the stator and the rotor, making it difficult to stably maintain the initial axis alignment. state

[0008] In particular, the bearings that rotatably support the rotating shaft of the rotor are not easily supported, so that the lateral displacement of the rotating shaft increases, and thus, there is a possibility that the wear of the bearings is accelerated and the life of the bearings is significantly shortened. question

[0009] In addition, when the motor assembly is provided with a pair of frames accommodating a stator and a rotor inside and coupled to face each other and fastened with bolts, there is a problem in that the size of the pair of frames is limited relative to the size of the stator. Significant increase in size and excessive increase in apparent size

And, there is a problem that the weight increases significantly due to the size increase of the frame

[0010] In this case, when reducing the size of the frame, the size of the stator and rotor becomes small, and therefore, there is a problem that the output of the motor may be insufficient

[0011] In addition, in some motor assemblies of such conventional hand-held devices, since two bearings are accommodated inside the case in a manner spaced apart from each other, and an impeller is disposed on one side of the two bearings, the The other side of the two bearings is provided with an eccentrically supported rotor, so there is a limitation in reducing the lateral displacement of the rotating shaft

[0012] Therefore, there is a limitation in increasing the maximum rotational speed of the motor assembly

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