KR101903169B1 - Hollow type BLDC Motor - Google Patents

Abstract

The present invention relates to a hollow BI motor, and more particularly, to a hollow BI motor that introduces a hollow shaft rotor in the form of an airfoil that does not disturb the flow of fluid, thereby facilitating the flow of the fluid.
According to another aspect of the present invention, there is provided a rotor comprising: a rotor having a hollow at a central portion thereof and having a dug-shaped outer surface and permanent magnets spaced apart from each other at a predetermined interval; A stator formed to surround the depression of the rotor and having a plurality of coils corresponding to the permanent magnets; And a housing which is formed so as to surround the stator and has an outer surface formed in a convex shape, wherein when the stator and the housing are coupled to the rotor, a cross- Is provided to facilitate fluid flow.

Description

[0001] Hollow type BLDC motor [0002]

The present invention relates to a hollow BI motor, and more particularly, to a hollow BI motor that introduces a hollow shaft rotor in the form of an airfoil that does not disturb the flow of fluid, thereby facilitating the flow of the fluid.

A motor is a device that converts electrical energy into mechanical energy using the force that a current-carrying conductor receives in a magnetic field, including a rotor including a rotating shaft and a stator opposite the rotor, The rotor rotates by the electromagnetic force, and the rotational force can be transmitted to the outside through the rotating shaft.

Generally, a motor can be divided into a DC motor and an AC motor.

First, in the case of a direct current motor, the rotor is composed of a rotating shaft for transmitting a rotating force to the outside, a core in which the rotating shaft is pushed in at the center, and a coil wound around the core. Further, the stator is provided on the inner surface of the motor housing so as to be opposed to the core at a predetermined interval, and is made of a permanent magnet.

In such a DC motor, when an electric current is supplied to the coil, the coil and the core are rotated by the electromagnetic force formed between the coil and the permanent magnet to rotate the rotating shaft.

On the other hand, in the case of an alternating-current motor, the rotor is composed of a rotating shaft and permanent magnets coupled to the outer circumferential surface of the rotating shaft with a certain radius. Further, the stator is constituted by a coil provided on the inner surface of the motor housing so as to be opposed to the permanent magnet of the rotor at a predetermined interval.

In this AC motor, unlike a DC motor, when a current is supplied to the coil of the stator, the permanent magnet rotates and rotates the rotating shaft.

As such, motors are roughly classified into DC motors and AC motors according to the types of power sources. Among them, a brushless DC motor is a type of DC motor and is widely used for driving home appliances.

Generally, a brushless DC motor is a motor having a stator having two-phase, three-phase or four-phase armature coils and a permanent magnet rotor, and having no commutator, and is widely used as a motor for variable- .

In particular, the application range has been widely extended from home use to industrial use, such as being used as a servo drive due to recent development of permanent magnet materials.

The BIST motor includes a stator made up of stator windings for generating a rotating magnetic field and stator iron cores forming a path of the magnetic flux to smooth the flow of the magnetic fluxes, and a rotor composed of a rotor iron core and a permanent magnet

All.

When the rotor system is applied to the stator winding made of a three-phase winding, the magnetic flux of the rotor system and the magnetic flux of the permanent magnet interact with each other, and the rotor rotates in a constant direction to generate torque.

In the case of using the BISTEC motor in a blower or a hair dryer, there is a problem that air velocity is reduced due to air friction at the outermost surface.

Korean Publication No. 10-1996-0018262 Domestic Publication No. 10-2015-0116368

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a hollow type BD motor which introduces a housing in the form of an airfoil which does not disturb the fluid flow,

According to an aspect of the present invention, there is provided a rotor comprising: a hollow formed at a central portion thereof, the rotor having a dent shape and an indentation portion provided with permanent magnets spaced apart from each other at a predetermined interval; A stator formed to surround the depression of the rotor and having a plurality of coils corresponding to the permanent magnets; And a housing formed to surround the stator and having a convex outer surface, wherein when the stator and the housing are coupled to each other, the rotor has a cross-section in the form of an airfoil parallel to the rotation axis.

According to another aspect of the present invention, there is provided a rotor comprising: a rotor body having a cylindrical shape and having a plurality of permanent magnets spaced apart from each other at an outer surface thereof; A housing front cover formed on a front surface of the rotor body and formed in a shape of a plate having a hollow at a central portion thereof and having a shape in which an outer surface of the housing protrudes toward the rotor body, And a housing rear cover formed on the rear surface of the rotor body and formed in a shape of a plate having a hollow at the center thereof and having a shape in which the outer surface is separated from the rotor body and reduced in diameter from the rotation axis.

According to an embodiment of the present invention, the rotor body includes a cylindrical tube formed in a cylindrical shape; And a plurality of permanent magnets spaced apart from each other at a predetermined interval on the surface of the cylindrical tube.

In addition, in the cylindrical tube of one aspect of the present invention, the first region to which a plurality of permanent magnets are attached in the direction of the rotational axis may be formed of a paramagnetic material to form a flux linkage, and a plurality of permanent magnets And the second region is formed of a non-magnetic substance.

In addition, the housing front cover, the rotor body, and the housing rear cover of one aspect of the present invention are integrally formed.

Further, the rotor according to an aspect of the present invention includes a plurality of blades protruding inward from an inner surface thereof.

Further, the rotor of one aspect of the present invention has a blade on the outer surface.

According to an aspect of the present invention, the blade is formed so that the horizontal length of the blade decreases toward the upper end protruding from the lower end connected to the housing front cover.

Further, the stator of one aspect of the present invention includes a stator core; A plurality of tooth portions extending in the direction of the rotational axis and disposed along the circumferential direction of the stator core; And a plurality of coils wound around the plurality of teeth portions.

According to the present invention as described above, it is possible to smoothly flow the fluid by introducing a housing in the form of an airfoil which does not disturb the fluid flow.

Further, according to the present invention, it is possible to realize a high-performance blower in which the electric efficiency is significantly higher than that of the conventional product by adopting the BI Dish motor provided with the airfoil-shaped housing in the blower.

In addition, according to the present invention, a bladder is mounted inside an airfoil-type motor to enable a blower having a mounting space and a blowing efficiency to be greatly increased.

In addition, according to the present invention, the noise of the motor itself is eliminated by using the BIST DC motor, and a hair dryer in which noise is reduced greatly by reducing the bottleneck section by using the air foil type housing can be realized.

In addition, according to the present invention, it is possible to adjust the wind speed in an infinite stage, thereby realizing a high-performance hair dryer.

1 is a perspective view of a rotor of a hollow type non-electric motor according to a preferred embodiment of the present invention.
FIG. 2A is a perspective view of a stator of a hollow type non-linear motor according to a preferred embodiment of the present invention, and FIG. 2B is a sectional view of a stator of a hollow type non-linear motor according to a preferred embodiment of the present invention.
3 is a perspective view of a housing of a hollow type non-LC motor according to a preferred embodiment of the present invention.
4 is a perspective view of a hollow BI DC motor according to a preferred embodiment of the present invention.
FIG. 5A is a perspective view of a hollow type BI DC motor according to another preferred embodiment of the present invention, and FIG. 5B is a sectional view of a hollow type BI DC motor according to another preferred embodiment of the present invention.
6 is a cross-sectional view of a blade installed in a hollow BI motor according to another preferred embodiment of the present invention.
FIG. 7A is a front view of a hollow-type BI DC motor according to another preferred embodiment of the present invention, FIG. 7B is a perspective view of a hollow BI DC motor according to another preferred embodiment of the present invention, and FIG. Sectional view of a hollow BI motor according to another preferred embodiment of the present invention.
FIG. 8A is a cross-sectional view of a blower to which the hollow-type VIEL DISC motor according to the present invention is applied, FIG. 8B is an internal view of the blower to which the hollow- Fig. 2 is a perspective view of a blower to which a Bieltzi seed motor is applied.
FIG. 9 is a cross-sectional view of a hair dryer to which a hollow type BI DC motor according to the present invention is applied.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments will be described in detail below with reference to the accompanying drawings.

The following examples are provided to aid in a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, this is merely an example and the present invention is not limited thereto.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification. The terms used in the detailed description are intended only to describe embodiments of the invention and should in no way be limiting. Unless specifically stated otherwise, the singular form of a term includes plural forms of meaning. In this description, the expressions "comprising" or "comprising" are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, Should not be construed to preclude the presence or possibility of other features, numbers, steps, operations, elements, portions or combinations thereof.

It is also to be understood that the terms first, second, etc. may be used to describe various components, but the components are not limited by the terms, and the terms may be used to distinguish one component from another .

1 is a perspective view of a rotor of a hollow type non-electric motor according to a preferred embodiment of the present invention.

Referring to FIG. 1, a rotor of a hollow type non-linear motor according to a preferred embodiment of the present invention includes a housing front cover 100, a rotor body 110, and a housing rear cover 120.

The housing front cover 100 is closely coupled to the rotor body 110 and may be formed integrally with the rotor body 110.

The housing front cover 100 has a shape in which a hollow is formed at the center of the housing, and the outer surface of the housing has a shape increasing in diameter from the rotating shaft while advancing toward the rotor body 110.

That is, the housing front cover 100 is formed in a plate-like shape with the lower surface of the dish positioned on the whole surface.

The diameter of the inner front surface of the housing front cover 100 is increased from the rotation axis toward the rotor body 110 while having the same diameter, but may be increased or decreased.

Since the shape of the housing front cover 100 is increased toward the rotor body 110 and the diameter of the housing front cover 100 increases around the rotation axis, the cross-section of the housing front cover 100 has an airfoil shape to smooth the flow of the fluid.

The housing front cover 100 closes the front surface of the housing described below.

The housing front cover 100 may be made of a metal or a synthetic resin having a high melting point.

The inside of the housing front cover 100 may have a hollow portion (not shown), and the hollow portion may be filled with a casting resin such as plastic, polyester, or the like.

Next, the rotor body 110 is provided with a hollow cylindrical tube 111 which is rotatable around a rotation axis.

For example, the cylindrical tube 111 may be a laminate of a plurality of thin plates made of, for example, a magnetic material or a magnetically permeable material, for example, ring-shaped steel plates in the direction of the rotation axis Z.

The permanent magnet 112 is disposed at equal intervals on one surface of a cylindrical tube 111 facing the tooth portion 220 of the stator 200 shown in Fig. 2 below, and extends along the circumferential direction of the cylindrical tube 111 to N The poles and the S poles are arranged alternately.

As a method of mounting the permanent magnet 112 on the cylindrical tube 111, a surface permanent magnet (SPM) and an intermagnetic permanent magnet (IPM)

have.

In the case of the surface magnet type, the permanent magnet 112 is attached to the outer circumferential surface of the cylindrical tube 111. In the case of the embedded magnet type, the permanent magnet 112 is buried in the inside of the cylindrical tube 111.

Compared with the surface magnet type, the buried magnet type can prevent the permanent magnet 112 from falling off from the cylindrical tube 111 and actively use the reluctance torque.

The first region 111a of the cylindrical tube 111 to which the permanent magnet 112 is attached in the direction of the rotation axis Z may be formed of a paramagnetic material to form a flux linkage and the permanent magnet 112 The second region 111b of the cylindrical tube 110 to which the second electrode 111 is not attached may be formed of a nonmagnetic material.

Meanwhile, the housing rear cover 120 is tightly coupled to the rotor body 110 and may be formed integrally with the rotor body 110.

The housing rear cover 120 is formed in a plate shape having a hollow at the center thereof, and has a shape in which the outer surface of the housing is away from the rotor body 110 and the diameter thereof decreases from the rotation axis.

That is, the housing rear cover 120 is formed in a shape of a dish and the lower surface of the dish is located on the rear surface.

The diameter of the inner rear surface 120 of the housing rear cover 120 may be the same as the diameter of the inner circumferential surface of the rotor main body 110, but may be increased or decreased.

Since the shape of the housing rear cover 120 is away from the rotor body 110 and the diameter of the housing rear cover 120 is reduced around the rotation axis, the cross section has an airfoil shape to smooth the flow of the fluid.

The housing rear cover 120 closes the rear surface of the housing described below with reference to FIG.

The housing rear cover 120 may be made of a metal or a synthetic resin having a high melting point.

The inside of the housing rear cover 120 may have a hollow portion (not shown), and the hollow portion may be filled with a casting resin such as plastic, polyester, or the like.

FIG. 2A is a perspective view of a stator of a hollow type non-linear motor according to a preferred embodiment of the present invention, and FIG. 2B is a sectional view of a stator of a hollow type non-linear motor according to a preferred embodiment of the present invention.

Referring to FIGS. 2A and 2B, a stator 200 of a hollow type non-linear motor according to an embodiment of the present invention includes a hollow stator core 210, a stator core 210 extending in the direction of the rotation axis Z, And a plurality of teeth 220 disposed along the circumferential direction of the rotor 210. The coil 230 is wound on the plurality of tooth portions 220.

The stator core 210 may have a ring-shaped thin metal plate stacked in the direction of the rotation axis Z.

The plurality of teeth portions 220 are formed on one surface of the stator core 210 facing the permanent magnets 112 of the rotor body 110 in the direction of the rotation axis Z at regular intervals along the circumferential direction of the stator core 210 As shown in FIG.

The stator core 210 to which a plurality of tooth portions 220 are attached in the direction of the rotation axis Z may be formed of a paramagnetic material to form a flux linkage. A plurality of recessed slots 250 for accommodating the coils 230 wound on the teeth 220 are formed between adjacent tooth portions 220. That is,

The plurality of slots 250 are arranged to be equidistantly spaced along the circumferential direction of the stator core 210. That is, the tooth portion 220 and the slot 250 are alternately arranged in the circumferential direction.

The coil 230 is formed by winding a wire with an insulator (not shown) interposed between each of the tooth portions 220.

The stator 210 has a structure that surrounds the outer surface of the rotor main body 110 with a distance from the outer surface of the rotor main body 110 having the magnetic body 112. The stator 210 has the rotor main body 110, A support portion for supporting the rotor body 110 freely rotatably is formed. The structure of the support portion may be formed in various structures and structures including bearings and the like to make the rotor body 110 rotatable.

3 is a perspective view of a housing of a hollow type non-LC motor according to a preferred embodiment of the present invention.

3, the housing 300 of the hollow type non-electric motor according to the preferred embodiment of the present invention has a structure capable of fixing the stator core 210 of the stator 200, The diameter of the center is increasing gradually, and after some point, it is formed in a decreasing convex shape.

The diameter of the inner surface of the housing 300 from the rotational axis of the rotor body 110 may be equal to the diameter of the outer circumference of the rotor body 110, but may be increased or decreased.

The housing 300 may be made of a metal or a synthetic resin having a high melting point.

The inside of the housing 300 may have a cavity portion, and the cavity portion may be filled with a casting resin such as plastic, polyester, or the like.

As described above, FIG. 1 shows a rotor of a hollow type non-LC motor according to a preferred embodiment of the present invention. FIGS. 2A and 2B are views showing a hollow type non-LCD motor according to a preferred embodiment of the present invention. FIG. 3 shows a housing of a hollow type non-electric motor according to a preferred embodiment of the present invention, and FIG. 3 shows a housing of the hollow type non-LC motor according to a preferred embodiment of the present invention. An overall perspective view of a hollow BI DSC according to an example is shown in FIG.

The housing front cover 100 has a shape in which a hollow is formed at a central portion thereof and a shape whose outer surface progresses toward the rotor body 110 and whose diameter increases from a rotation axis.

The housing 300 has a structure capable of fixing the stator core 210 of the stator 200. The outer surface of the stator 200 has a diameter increasing gradually with respect to the rotation axis and decreasing after a certain point .

Next, the shape of the housing rear cover 120 has a shape in which the diameter of the rear cover 120 is reduced from the center of the rotary shaft while being away from the rotor body 110.

When the housing front cover 100, the housing 300, and the housing rear cover 120 are coupled to each other, an airfoil is formed as a whole as shown in FIG. 4 to smooth the flow of the fluid.

FIG. 5A is a perspective view of a hollow type BI DC motor according to another preferred embodiment of the present invention, and FIG. 5B is a sectional view of a hollow type BI DC motor according to another preferred embodiment of the present invention.

5A and 5B, a hollow type BDC according to another preferred embodiment of the present invention includes a plurality of projections toward the inner center to generate a flow of fluid as the rotor rotates on the inner surface of the upper housing cover, Blade 112in is installed. Here, the blade 112in is not limited to the shapes shown in FIGS. 5A and 5B, but may be formed in various shapes for generating a flow of fluid according to the rotation of the rotor.

The plurality of blades 112in disposed in the upper housing cover are formed along the circumferential direction so as to protrude toward the inner center in order to minimize the volume occupied in the inner space of the rotor and smooth the fluid flow, As shown in the embodiment of the blade installed in the hollow type BI DC motor according to the present invention shown in FIG. 6, the horizontal length A is further reduced toward the upper end protruding from the lower end connected to the housing front cover .

As described above, according to the present invention, when the blade 112in is formed such that its horizontal length is narrowed from the lower portion to the upper portion, the vortex of the fluid flow generated at the portion where the blade 112in contacts the inner surface of the housing front cover is reduced, It is possible to eliminate the phenomenon that the foreign matter adheres to the portion of the housing 112 in contact with the inner surface of the housing front cover, so that the flow of the fluid can be maintained more smoothly.

Here, the blade 112in is provided inside the housing front cover, but the blade 112in may be provided inside the rotor.

FIG. 7A is a front view of a hollow-type BI DC motor according to another preferred embodiment of the present invention, FIG. 7B is a perspective view of a hollow BI DC motor according to another preferred embodiment of the present invention, and FIG. Sectional view of a hollow BI motor according to another preferred embodiment of the present invention.

7A to 7C, a hollow type BDC according to another preferred embodiment of the present invention includes a housing front cover having a plurality of projections protruding outward to generate a flow of fluid as the rotor rotates, Blade 112out is installed. Here, the blade 112out is not limited to the shapes shown in FIGS. 7A to 7C and may be formed in various shapes for generating a flow of the fluid as the rotor rotates.

As described above, the blades 112out provided on the outer surface of the housing front cover are protruded toward the outside to smooth fluid flow, and a plurality of blades are formed along the circumferential direction. Preferably, the blades 112out protrude from a lower end portion connected to the housing front cover, The horizontal length A may be further reduced.

As described above, according to the present invention, when the blade 112out is formed so as to have its horizontal length narrowed from the lower portion to the upper portion, the blade 112out reduces the swirling flow of the fluid flow while the blade 112out abuts against the outer surface of the housing front cover It is possible to eliminate the phenomenon that the foreign matter adheres to the area, and thus the flow of the fluid can be maintained more smoothly.

FIG. 8A is a cross-sectional view of a blower to which a hollow-type VIE DC motor according to the present invention is applied, FIG. 8B is an internal view of an air blower to which a hollow-type VIE DC motor according to the present invention is applied, Fig. 2 is a perspective view of a blower to which a Bieltzi seed motor is applied.

8A to 8C, the blower to which the hollow type BD motor according to the present invention is applied includes a housing 1 and a hollow type BD motor 2 installed inside the housing.

In order to blow air, the housing 1 is provided with a suction port for sucking air from the outside and an exhaust port for discharging the sucked air. In order to prevent corrosion by moisture or the like, SUS (Steel Use Stainless) And the like.

The hollow type BD motor 2 is a hollow type BD motor disclosed in FIGS. 7A to 7C, and is mounted and fixed by a plurality of motor fixing members 3 inside the housing 1. As shown in FIG.

With the above-described configuration, as the power source of the predetermined frequency outputted from the inverter of the control box (not shown) is supplied to the hollow type BDC motor 2, the blades are rotated and air can be blown.

Here, the control box includes a converter for converting the commercial power supplied from the outside into a predetermined level, and an inverter for supplying the power converted by the converter to the hollow type BD motor 2.

As described above, if the hollow type BD motor according to the present invention is used in a blower, the problems of the related art can be solved.

That is, according to the conventional art, in the case of the blowing fan, the outermost air of the inside has a severe friction, so that the speed decreases. In the case of the central part where the outer edge of the fan and the air resistance are the smallest, A phenomenon occurs.

This phenomenon ultimately affects the efficiency of the fan. However, when the hollow type BD motor having the housing of the efoil type according to the present invention is applied, the flow separation phenomenon at the center portion disappears.

FIG. 9 is a cross-sectional view of a hair dryer to which a hollow type BI DC motor according to the present invention is applied.

Referring to FIG. 9, the hair dryer includes a main body 20 and a hollow type BD motor 30 disposed inside the main body 20, in which the hollow type BD motor according to the present invention is applied.

As described above, the hair dryer for drying the wet hair by supplying the hot wind according to the present invention includes a hollow type BD motor 30 for allowing outside air to flow into the main body 20 to send vivid winds, The blade 40 is installed and a heating unit 10 for generating hot wind in front of the blade 40 is provided. The heating unit 10 is constituted such that a coil-shaped heating element is wound around a + .

The hair dryer can discharge hot wind to the discharge port 12 of the main body when operating the blade 40 and the heating unit 10 in the main body 20, The user can discharge the cool air to the discharge port 12 of the main body when operating only the air blower 40.

As compared with the prior art, the hair drier according to the present invention adopts the BIU DC motor to eliminate the noise of the motor itself and to adopt the airfoil-shaped housing to reduce the bottleneck section of the air intake, thereby greatly reducing the noise.

According to the present invention as described above, it is possible to smoothly flow the fluid by introducing a housing in the form of an airfoil which does not disturb the fluid flow.

Further, according to the present invention, it is possible to realize a high-performance blower in which the electric efficiency is significantly higher than that of the conventional product by adopting the BI Dish motor provided with the airfoil-shaped housing in the blower.

In addition, according to the present invention, a bladder is mounted inside an airfoil-type motor to enable a blower having a mounting space and a blowing efficiency to be greatly increased.

In addition, according to the present invention, the noise of the motor itself is eliminated by using the BIST DC motor, and a hair dryer in which noise is reduced greatly by reducing the bottleneck section by using the air foil type housing can be realized.

In addition, according to the present invention, it is possible to adjust the wind speed in an infinite stage, thereby realizing a high-performance hair dryer.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

100: housing front cover 110: rotor body
111: Cylindrical tube 112: Permanent magnet
120: housing rear cover 200: stator
210: stator core 220:
230: coil 300: housing

Claims (9)

A rotor having a hollow formed at a central portion thereof and having a recessed portion formed with permanent magnets whose outer surfaces are spaced apart from each other by a predetermined distance in the middle portion thereof;
A stator formed to surround the depression of the rotor and having a plurality of coils corresponding to the permanent magnets; And
And a housing formed to surround the stator and having a convex outer surface,
Wherein the rotor has a cross section in the form of an airfoil parallel to the rotation axis when the stator and the housing are coupled to each other. The method according to claim 1,
The rotor
1. A rotor comprising: a rotor body having a plurality of permanent magnets spaced at regular intervals on a cylindrical outer surface;
A housing front cover formed on the front surface of the rotor body and formed in a shape of a dish having a hollow at the center thereof and having a shape in which the outer surface progresses toward the rotor and the diameter increases from the rotary shaft; And
And a housing rear cover which is formed on a rear surface of the rotor body and has a hollow shape at a central portion thereof and whose diameter is reduced from a rotation axis while the outer surface thereof is away from the rotor body. The method according to claim 2,
The rotor main body
A cylindrical tube formed into a cylindrical shape; And
And a plurality of permanent magnets spaced apart from each other at a predetermined interval on the surface of the cylindrical tube. The method according to claim 3,
In the cylindrical tube, a first region to which a plurality of permanent magnets are attached may be formed of a paramagnetic material to form a flux linkage, and a second region to which a plurality of permanent magnets are not attached in a direction of a rotation axis, A hollow CBM motor to be formed. The method according to claim 2,
Wherein the housing front cover, the rotor body, and the housing rear cover are integrally formed. The method according to claim 1,
Wherein the rotor has a plurality of blades protruding inwardly on an inner surface thereof. The method according to claim 1,
Wherein the rotor is provided with a blade on an outer surface thereof. The method as claimed in claim 6 or 7,
Wherein the blade is formed such that the horizontal length thereof decreases as it goes from the lower end portion protruding from the lower end portion connected to the housing front cover to the upper end portion. The method according to claim 1,
The stator
Stator core;
A plurality of tooth portions extending in the direction of the rotational axis and disposed along the circumferential direction of the stator core; And
A hollow BI DC motor comprising a plurality of coils wound around a plurality of teeth portions.

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