KR101012181B1 - Outer rotor type fan motor - Google Patents

Abstract

The present invention relates to a bearing that can be easily inserted and supported by a rotating shaft and an outer rotor type fan motor provided with a configuration in which a bearing can be fixed inside the housing. The stator includes a stator including a core, an insulator, and a coil. , A rotor including a magnet, a rotating shaft, and a rotor frame, an inner extension portion into which the stator is inserted along the outer circumferential surface, an inner circumferential surface of the inner extension portion, a bearing for rotationally supporting the rotating shaft, and formed inside one end of the inner extension portion, It provides a fan motor of the outer rotor type comprising an elastic member for elastically supporting the bearing.

Outer rotor, bearing, rotor, rotor frame, stator, inner extension part, fixed member

Description

Outer rotor type fan motor {OUTER ROTOR TYPE FAN MOTOR}

The present invention relates to a fan motor of an outer rotor type, and more particularly, to an outer rotor type fan motor provided with a bearing in which a rotating shaft is easily inserted and accurately supported, and a configuration in which a bearing can be fixed inside the housing. It is about.

In general, the blowing fan applied to the refrigerator is driven by an inner rotor type motor in which a rotor installed inside the stator rotates to function to circulate cold air into the refrigerator. .

The motor transmits the rotational force of the rotor to the outside by the electromagnetic interaction between the stator and the rotor, the transmission of this rotational force is through the rotation axis.

The stator generally includes a stator core and a coil wound around the stator core. At this time, the stator core is electrically insulated from the coil through the insulator.

Meanwhile, in the recent fan motor, an outer rotor type fan motor capable of compacting in the radial direction and the axial direction is applied in consideration of the installation space in the refrigerator.

1 is a longitudinal side view illustrating a conventional outer rotor type fan motor. As shown, the outer rotor fan motor 10 is roughly the lower bearing member (2), the stator (3) attached to the lower bearing member (2), the upper bearing member (4) attached to the stator (3) And a rotor 6 having a rotary shaft 5 rotated and supported by both bearing members 2 and 4 as a center and a fan portion 7 provided on the outer periphery of the rotor 6.

Specifically, the rotor 6 is a rotor plate 8 made of galvanized steel sheet spaced apart in a cylindrical cup shape on the outer circumferential surface of the stator 3, and a magnet 9 attached to the inner circumferential surface of the rotor frame 8. It consists of). The magnet 9 is inserted into and fixed to the rear end side of the inner circumferential surface of the rotor frame 8. Then, one end of the rotary shaft 5 is fixed to the center of one end of the rotor 6 in a press-fit manner.

With this configuration, the outer rotor type fan motor, in which the rotating shaft is rotatably supported by both bearing members 2 and 4, and the magnet 9 is spaced apart from the outer circumferential surface of the stator 3 at predetermined intervals. 10) constitute.

The fan portion 7 is made of a synthetic resin material and is integrally formed by inserting the rotor frame 8 and injecting and molding molten material. This fan part 7 mainly consists of the hub part 7a which covers the outer periphery of the rotor frame 8, and the wing part 7b extended in the radial direction.

Here, the rotor is rotated by the mutual electromagnetic action of the stator 3 and the rotor 6, and the fan unit 7 is rotated by the hub coupled to the rotor rotates with the rotor 6 .

By the way, in the conventional outer rotor fan motor 10, a bearing for supporting the rotation of the rotating shaft is installed in the upper and lower places, there was a problem that the rotation center is undesirably changed by the rotation of the fan. . This change in rotation center causes vibration of the entire blower fan.

In addition, when fastening the rotary shaft is not properly aligned (align), the efficiency of the production process is lowered, in some cases may damage the rotary shaft, there was room for noise.

In addition, conventional bearings are inserted by a method of forcibly pressing into the fan bracket or stator, causing damage such as cracks on the bracket or stator, and increasing friction with the rotating shaft due to a change in the bearing inner diameter. There was a problem that does not.

The present invention has been made in order to solve the problems of the prior art, a bearing that can be easily inserted and accurately supported by the rotating shaft, and an outer rotor type fan motor provided with a configuration that can be fixed in the housing housing The purpose is to provide.

The present invention for solving the above problems is a stator, a magnet, a rotating shaft, and a rotor including a stator, a rotor, and a rotor frame including a core, an insulator and a coil are inserted into an inner circumferential surface and an inner circumferential surface of the inner extending portion. The present invention provides a fan motor of an outer rotor type including a bearing for rotating and supporting a rotating shaft and a fixed member configured to elastically support a bearing, the bearing being formed inside the inner extension part. Thus, since the bearing is fixed through a separately configured spherical member, deformation of the bearing and the adjacent members is minimized.

In addition, the present invention provides a fan motor of the outer rotor type bearing is a single cylindrical shape. Therefore, insertion of the rotational shaft is easy and can be precisely arranged on the central axis.

In addition, the present invention provides a fan motor of the outer rotor type including a bearing cover coupled to the other end of the inner extending portion so that the bearing is not separated. Thus, a structure is provided in which the bearing and the felt do not come off.

In addition, the present invention provides a fan motor of the outer rotor type that is ultrasonically fused in a state in which the bearing cover is coupled to the other end of the inner extension portion.

In addition, the present invention provides a fan motor of the outer rotor type of the fixing member is a spring.

In addition, the present invention provides a fan motor of the outer rotor type that the spring is compressed between the end of the bearing and one end of the inner extension when the bearing is inserted along the inner peripheral surface of the inner extension. Therefore, the bearing is supported by the elasticity of the spring.

In addition, the present invention provides a fan motor of the outer rotor type of the fixing member is a protrusion formed on one end of the inner extending portion. Therefore, the fixing member formed in the housing itself can be used, so that the fan motor is simple in structure.

In addition, the present invention provides a fan motor of the outer rotor type when the projection is inserted along the inner circumferential surface of the inner extension portion, the shape is modified by the bearing and the shape is modified when the bearing is inserted to support the bearing. Therefore, the bearing is supported by the elasticity of the projection.

In addition, the present invention provides a fan motor of the outer rotor system having a projection inclined surface.

In addition, the present invention provides a fan motor of the outer rotor type in which a step is formed in each of the inner extension portion and the bearing for supporting the fixing member. Thus, the fixing member can support the bearing in the correct position.

By the outer rotor type fan motor according to the present invention configured as described above, a solid coupling of the rotating shaft and the rotor can be provided, it is possible to prevent damage due to separation or eccentricity. In addition, while the coupling of the rotation shaft and the rotor is facilitated, the rotation shaft can be accurately supported in the center of the fan motor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a side view illustrating a state in which the stator, the housing, and the rotor are coupled according to the present invention, and FIG. 4 is a perspective view illustrating a state in which the stator and the housing shown in FIG. 3 are coupled.

The printed circuit board 310 of the fan motor of the outer rotor type according to the present invention is configured in combination with the stator and the housing 240. As a result, the electrical connection between the printed circuit board and the coil is more stable, and vibration and friction are reduced, which is an advantage of the outer rotor type fan motor. That is, the stator 300 is disposed at the center of the motor rotation shaft, the rotor 122 is disposed to be spaced apart surrounding the stator 300, and the printed circuit board 310 is integrally coupled with the stator 300 so as to generate current. Being connected to the coil 333 to flow is excellent mechanical and electrical stability.

The printed circuit board 310 includes a terminal, a printed circuit, and a power device, and serves to control the electrical flow of the BLDC motor. Electrical insulation of the printed circuit board 310 is made by a mold resin surrounding the printed circuit board 310. The mold resin wraps the outer surface of the printed circuit board 310 with a predetermined thickness. Such a mold resin may be formed in various materials and various shapes, for example, may be made of macromelt or BMC.

The molding of the printed circuit board 310 by the mold resin will be described in more detail. The coils 333 wound on the respective phases (u, v, and w) of the stator 300 are each end of the printed circuit board 310. It is soldered to the corresponding terminal of, and coupled with the housing 240 in a state of mechanical coupling. Coupling of the housing 240 and the stator 300 is made through a method in which the inner extension 241 of the housing 240 is press-fitted into the hollow formed in the center of the stator 300.

Accordingly, the printed circuit board 310 is disposed in the space between the inner bottom portion of the housing 240 in the direction of the stator 300 and the end portion of the stator 300 in the direction of the housing 240. In the combined state as described above, a mold resin for insulation of the printed circuit board 310 is injected, and the mold resin is inward of the stator 300 of the housing 240 to a height at which the printed circuit board 310 can be locked. Injected into the floor.

On the other hand, the printed circuit board 310 and the stator 300 may increase the mechanical coupling force by the insertion protrusion and the insertion hole. Since the coupling force in the circumferential direction is increased by the insertion protrusion and the insertion hole, it is possible to prevent the coupling from being easily detached by the vibration of the fan motor.

A plurality of insertion protrusions and insertion holes are formed along a front end surface of one end of the stator 300 in the direction of the housing 240, and preferably three of each of the insertion protrusions and the insertion holes. On the other hand, depending on the shape of the stator 300 and the printed circuit board 310 and the injection method of the mold resin, the position or number of the insertion protrusion and the insertion hole can be variously applied.

In addition, a stepped portion for fixing and coupling the printed circuit board 310 may be formed on the inner bottom surface of the housing 240. Preferably, the stepped portion is formed in a shape and depth such that the printed circuit board 310 can be locked in a state where the stator 300 and the housing 240 are coupled to each other. Accordingly, the mold resin is injected into the stepped portion, whereby the printed circuit board 310 is completely held by the mold resin, thereby being coupled to the housing 240 and electrically insulated.

The stator 300 includes a core 332, a coil 333, and an insulator 331. The insulator 331 is formed of an insulating material and may be coupled to an upper portion and a lower portion of the core 332. In addition, the core 332 may be inserted and injected to be integrally formed with the core 332.

The coil 333 is wound around the core 332 through the insulator 331, so that the core 332 is insulated from the coil 333. In addition, a position at which the coil 333 is wound through the insulator 331 may be determined and fixed.

In addition, the stator 300 has a hollow shape so that the rotation shaft 500 and the inner extension portion 241 of the housing can be inserted into the center portion.

Hereinafter, the housing 240 according to the present invention will be described in more detail with reference to FIGS. 3 and 4.

The housing 240 has a side portion having a wall covering the outer surface of the stator 300 and the rotor 122 and the stator 300 and the printed circuit board 310 in a direction facing the rotor 122 of the stator 300. It consists of a bottom portion to be combined with.

An inner side extending portion 241 having an outer diameter corresponding to the inner diameter of the hollow portion of the stator 300 is formed on the inner bottom surface of the housing 240 in the direction of the stator 300. The inner extension part 241 is coupled in such a way as to be press-fitted into the hollow portion of the stator 300. Accordingly, the stator 300 and the housing 240 may be coupled and fixed. The bearing 210 is supported inside the inner extension part 241, and the rotating shaft 500 is supported on the central axis by the bearing 210.

Preferably, the inner extension part 241 is manufactured integrally with the housing 240. Therefore, the structure of the fan motor becomes simpler because it is formed of a single injection molding. The housing 240 has a structurally simple advantage because it has a structure that can support the bearing 210 at the same time, while being coupled with the stator 300 as will be described later.

In addition, as described above, the bottom of the housing 240 is fixed to the printed circuit board 310 is disposed between the end of the stator 300, and is fixed and insulated by the mold resin. On the other hand, the bottom portion may be formed with a stepped portion so that the printed circuit board 310 may be embedded.

On the other hand, on the opposite side of the inner extending portion 241 of the bottom portion of the housing 240 may be formed a protrusion coaxial with the rotation shaft 500. The protrusion is formed to surround the rotation shaft 500 by a predetermined length. The surface formed around the protruding portion, that is, on the opposite side of the stator 300 at the bottom of the housing 240, the dustproof member can alleviate the shock and vibration transmitted between the refrigerator or the bracket that can be connected to the refrigerator. Can be formed. Preferably, the dustproof member is a rubber plate. At this time, the protrusion serves as a guide for determining the position of the rubber.

In addition, the outer rotor type fan motor 100 forms the outer surface of the housing 240 and the bottom of the rotor 122, and the inside of the rotor 122, the stator 300, or the printed circuit board 310. It is preferable to form a sealing structure to prevent the inflow of foreign substances and the like. Accordingly, the upper housing may be completely spaced apart from the rotor 122, and coupled to the housing 240 in a direction opposite to the housing 240. The upper housing is enclosed while forming the outer surface of the housing 240 and the fan motor, and forms an enclosed space therein.

The housing 240 and the upper housing are coupled through separate coupling means to seal the internal space. The coupling means may be a method such as bonding or bolt fastening, it is more preferable that the coupling is made through the hook (241) coupling. On the outer circumferential surface of the open end of the housing 240, a hook 245 having a protruding shape corresponding to the hook engaging portion of the upper housing may be formed, and the hook may be formed on the inner circumferential surface of the open end of the housing 240. to be.

In addition, the hook housing may be formed at the end of the upper housing in a position corresponding to the hook 245 described above. Therefore, the hook 245 does not require mounting of a separate fastening means, and the upper housing after coupling the members of the stator 300, the rotor 122, the printed circuit board 310, and the like to the housing 240. By inserting the inside of the fan motor can be sealed.

By the coupling structure of the housing 240 and the upper housing by the hook 245, there is no need for a separate fastening means, the hook portion can be formed in a mold together with the production of the housing 240, the production process This has the advantage of being simpler and easier to combine.

In addition, a bearing 210 is inserted into the inner extension part 241 of the housing 240 to support the rotation shaft 500. Preferably the bearing 210 is of a single cylindrical shape. As such, when the bearing 210 is formed in a single cylindrical shape, separate members for supporting the bearing may be omitted as compared with the conventional two bearing members are coupled, and the shaft center is easily fixed when the rotating shaft is inserted. And, there is an advantage that the reliability of the rotation operation can be provided.

The bearing 210 is inserted and fixed in such a manner as to be pressed into the inner extension part 241, and the felt 220 impregnated with oil is disposed on the outer circumferential surface of the bearing 210, so that the oil is bearing 210 and the rotating shaft ( 500) to lubricate. The felt 220 is disposed on the outer circumferential surface of the bearing 210 by a part of the axial length of the bearing 210, and preferably can be inserted after the bearing 210 is inserted into the inner extension portion 241, The upper portion of the inner extension portion 241, that is, adjacent to the end side of the inner extension portion 241 opposite to the bottom of the housing 240 is disposed.

On the other hand, the rotor 122 and the rotation shaft 500 may be fixed in such a way that the rotation shaft 500 is press-fitted to the boss portion or the insertion protrusion formed in the center of the bottom portion of the rotor 122, as will be described below the resin material 140 It may be fixed by. Hereinafter, the rotor 122 according to the present invention will be described in detail with reference to the drawings.

5 is a detailed view of the rotor 122 according to the present invention. Specifically, FIGS. 5A and 5B are perspective views illustrating a state in which the rotating shaft 500 and the rotor 122 are coupled to each other by the mold resin 140, respectively, and 5c is a perspective view illustrating the rotor 122 before being coupled. to be. 6 is a side cross-sectional view illustrating a state in which the rotor 122 and the rotation shaft 500 are coupled to each other.

The rotor 122 is formed of a cylindrical wall surface and a bottom portion, is coupled to the rotation axis 500 and the center, and is configured to couple to the magnet 130 on the inner peripheral surface of the cylindrical wall surface. In the coupled state, the rotor 122 has the rotation shaft 500 at the center thereof so as to be supported by the bearing 210 in a state where the stator 300, the bearing 210, the housing 240, and the like described above are coupled to each other. The inner circumferential surface of the rotor 122 is inserted and formed to be spaced apart from the outer circumferential surface of the stator 300. In addition, the outer circumferential surface of the rotor 122 is configured to be spaced apart from the inner surface of the housing 240 to rotate.

The bottom portion of the rotor 122 protrudes outward from the center, and the boss portion 123 into which the rotation shaft 500 can be inserted by a predetermined length is formed. The rotating shaft 500 may be inserted by a method of press-fitting into the boss 123, and may be inserted and fixedly coupled through a separate fixing means.

The fixing means is preferably made of a mold resin 140, the mold resin 140 after the rotary shaft 500 is inserted into the boss 123 formed on the bottom of the rotor 122 and the rotary shaft 500 and It is formed to surround the engaging portion of the rotor 122.

In addition, a hole 124 through which the mold resin 140 may be injected is formed at the bottom of the rotor 122. It is also preferable that the mold resin is injected from both sides of the hole 124, that is, from both sides of the bottom part, so as to completely surround the inner surface of the bottom of the rotary shaft 500, the boss part 123, and the rotor 122.

On the other hand, when the rotary shaft 500 is coupled to the rotor 122 by the mold resin 140, the rotary shaft 500 is inserted into the bottom opening of the rotor 122, the boss portion 123 is omitted, and the mold resin ( Of course, it can be fixed by).

In addition, the mold resin 140 is injected to be filled by a predetermined height of the bottom portion, preferably, the magnet 130 is formed to a depth to be inserted along the inner circumference of the cylindrical wall surface of the rotor 122. Therefore, the mold resin 140 that is injected into the rotor 122 and cured serves as a stopper for determining the coupling position of the magnet 130.

On the other hand, the magnet 130 is preferably composed of a neodymium (NdFeB) magnet. The neodymium magnet is a ground earth metal of Nd and B, which is ground after powder metallurgy molding, and has a small specific gravity, which enables miniaturization and light weight, and is characterized by high magnetism. In addition, since the mechanical strength is high, there is less cracking and the like, and there is an advantage of easy handling after machining and magnetization. Thus, a small refrigerator fan motor 100 having a strong torque is provided.

In addition, the present invention provides a method of manufacturing a rotor that is more robust to the combination of the rotation shaft 500 and the rotor 122. In the manufacturing method of the rotor inserting the rotary shaft 500 in the opening formed in the bottom of the rotor 122, the insert molding to surround the insertion portion of the rotary shaft 500, More preferably, the hole formed in the closed end of the rotor Resin can be injected from both sides to ensure the reliability of the bond.

By the outer rotor type fan motor according to the present invention configured as described above, a solid coupling of the rotating shaft and the rotor can be provided, it is possible to prevent damage due to separation or eccentricity. In addition, since the rotation shaft is easily coupled to the rotor, the rotation shaft can be accurately supported at the center of the fan motor, thereby ensuring the operational reliability and durability of the fan motor.

Meanwhile, the bearing 210 may be supported by the inner extension part 241 through a method of being inserted into the inner extension part 241 and fixed by a separate fixing means, rather than being pressed into the inner extension part 241. have. Hereinafter, an embodiment of a bearing 210 insertion structure according to the present invention will be described based on the drawings.

7 is a view showing a bearing 210 according to the present invention, Figure 8 is a view showing a fan motor to which the bearing 210 and the elastic member 242 is applied according to an embodiment of the present invention, Figure 9 Is a view illustrating a fan motor to which a bearing 210 and a fixing member 243 are applied according to another embodiment of the present invention.

7 shows the structure of the bearing 210 in more detail. The lower end of the inner extension portion 241 of the bearing 210, that is, the end portion facing the bottom of the housing 240 is formed in a protrusion shape by the stepped portion 211 so that the fixing means can be supported.

In addition, the upper portion of the bearing 210 has a felt position portion 212 is formed so that the felt 220 is wrapped around the outer peripheral surface, it may be formed to have a radius smaller than the inner diameter of the inner extension 241. . On the other hand, the bearing 210 is made of a metal cylindrical shape of the same material, the groove 213 is formed in the axial direction on the outer circumferential surface so that oil can flow evenly from the felt 220 in the axial direction.

The fixing means is made of a member having elasticity, and may preferably be a protrusion 243 formed at one end of the spring 242 or the inner extension part 241. First, the case where the fixing means is a spring 242 will be described.

A groove or a step corresponding to the stepped portion 211 of the bearing 210 is formed at one end of the inner side adjacent to the bottom surface of the housing 240 of the inner extension part 241 so that the spring 242 can be supported. do. The lower end of the spring 242 is supported by the groove or step of the inner extension part 241, and the upper end is supported by the guide protrusion formed by the stepped part 211 of the bearing 210. When the bearing 210 is supported by the spring 242 and inserted into the inner extension portion 241, the felt 220 is disposed while surrounding the outer peripheral surface of the upper portion. In addition, a stepped portion 246 may be formed on the inner circumferential surface of the inner extension portion 241 in the circumferential direction corresponding to the felt position portion 212 of the upper portion of the bearing 210. Therefore, it is possible to secure a space in which the felt 220 can be located. When the bearing 210 is elastically supported by the spring 242 while being pressed in the direction of the inner extension portion 241, the bearing cover 230 is coupled to the bearing cover 230 at the other end of the inner side extension portion 241 opposite to the housing 240. 210 and felt 220 are also supported at the top.

The step portion 211 supports the spring in a shape that is inserted into the protrusion shape on the inner circumferential surface of the spring 242, and serves to guide the spring. That is, the guide protrusion formed by the stepped portion 211 serves to prevent the detachment while supporting the spring 242. Therefore, since the spring 242 is guided by the guide protrusion while being compressed, the spring 242 can only move in the axial direction inside the inner extension 241, so that the bearing is accurately supported by the elastic force of the spring 242. Can be.

The bearing cover 230 is formed in a hollow shape so that the rotating shaft 500 can be penetrated to the center, and may be coupled in a manner of being pressed into the other end of the inner extension part 241, and may also be fastened in a hook manner. have. More preferably, the bearing cover 230 is coupled in such a way that the other end of the inner extension portion 241 is ultrasonically fused. Accordingly, the possibility of the bearing cover 230 and the bearing 210 being separated due to the rotation and vibration of the fan motor is minimized.

On the other hand, when the fixing means is a projection 243 formed on the inner one end of the inner extension portion 241, as in the case of the spring 242, the bearing 210 is inserted into the inner extension portion 241 and the projection 243 ) Is elastically supported while deforming. Accordingly, the felt 220 and the bearing cover 230 are coupled to support the bearing while supporting and lubricating the rotating shaft 500.

The structure of the protrusion 243 is shown in more detail in FIG.

The protrusion 243 is preferably inclined at one end adjacent to the bottom of the inner extension portion 241 of the housing 240, the radius between the protrusions 243 being smaller than the inner diameter of the inner extension portion 241. It becomes a shape. The cross-sectional area of the protrusion 243 is formed small in the direction in which the bearing 210 is inserted, and the closer the bottom portion of the housing 240 is, the wider the cross section becomes. Therefore, as the bearing 210 is inserted, a portion of the cross-sectional area of the inclined surface contacts the stepped portion, and deformation of the protrusion 243 occurs.

As the protrusion 243 is deformed, the bearing 210 is supported in the direction of the other end of the inner extension part 241. The protrusion 243 is deformed while being compressed in the axial direction and the radial direction from the top of the protrusion 243 while contacting the stepped portion 211 by the insertion of the bearing 210. The bearing 210 may be supported in the inner extension part 241 by the protrusion 243 and the cover 230.

On the other hand, due to the deformation of the projections 243, the mechanical coupling of the inner extension portion 241 and the bearing 210 can be strengthened, that is, the projections on the outer peripheral surface of the projection shape by the stepped portion 211 of the bearing 210 243 is in contact with each other to cause deformation, and the bearing 210 can be supported by pushing the bearing 210 in the central axis direction.

In addition, a plurality of protrusions 243 are formed along the inner diameter of the inner extension part 241, and preferably four are formed.

On the other hand, the bearing cover 230 is formed in the same manner as described in the case of the spring 242.

Through the bearing 210 and the fixing means configured as described above, the certainty is provided to ensure alignment when the bearing 210 and the rotating shaft 500 are fastened. That is, when the bearing member is configured separately from the top / bottom of the stator 300 as in the prior art, not only the insertion of the rotary shaft 500 is not easy, but also scratches may occur on the rotary shaft to generate noise. have. Therefore, in the case of the present invention, while the rotation shaft 500 can be accurately supported on the central axis of the fan motor 100, the production process is easy.

In the above, the present invention has been described in detail based on the embodiment and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

1 is a view showing an example of a fan motor of the outer rotor method according to the prior art.

2 is a view showing an example in which a stator and a printed circuit board are combined according to the related art.

3 is a view showing a fan motor according to the present invention.

4 is a view showing a state of coupling of the stator and the housing of FIG.

5 is a view showing an embodiment in which a rotor and a rotating shaft are coupled according to the present invention.

Figure 6 is a side cross-sectional view of the rotor and the rotating shaft shown in FIG.

7 shows a bearing according to the invention.

8 is a view showing an embodiment of a fixing structure of a bearing according to the present invention.

9 is a view showing a bearing and the fixing means according to another embodiment of the present invention.

10 is an enlarged view of the fixing means of FIG.

** Description of the main parts of the drawing **

100: fan motor 122: rotor

123: boss 124: hall

130: magnet 140: mold resin

210: bearing 220: felt

240 housing 241 inner extension portion

300: stator 310: printed circuit board

331: Insulator 332: Core

333: coil 500: rotating shaft

Claims (8)

A stator comprising a core, an insulator, and a coil; A rotor including a rotor frame surrounding the state, a mark net positioned on an inner circumferential surface of the rotor frame, and a rotation axis coupled to a center of the rotor frame; An inner extension portion in which a stator is inserted along an outer circumferential surface; A cylindrical bearing inserted into an inner circumferential surface of the inner extension part and supporting the rotation shaft; And, It is located inside the one end of the inner extension portion, the elastic member for supporting and supporting the bearing at the lower end of the bearing; The upper portion of the bearing has an outer diameter smaller than the inner diameter of the inner extension portion is wrapped by a felt containing oil The outer rotor type fan motor, characterized in that. The method of claim 1, The bearing is an outer rotor type fan motor, characterized in that at least one groove is formed in the longitudinal direction so that oil can flow from the felt. The method according to claim 1 or 2, An outer rotor type fan motor, comprising: a bearing cover coupled to the other end of the inner extension portion so that the bearing does not deviate. The method of claim 3, An outer rotor type fan motor, wherein the bearing cover is ultrasonically fused in a state of being coupled to the other end of the inner extension part. The method of claim 1, The outer rotor type fan motor, characterized in that the elastic member is a spring. The method according to claim 1 or 2, The inner rotor portion, the outer rotor type fan motor, characterized in that the step formed in the circumferential direction on the inner peripheral surface corresponding to the upper portion of the bearing. The method of claim 5, A groove formed at one end of the inner extension portion for supporting the spring; And, The outer rotor type fan motor comprising a; guide protrusion for guiding the spring is formed in the bearing. 6. The method according to claim 1 or 5, An outer rotor type fan motor, characterized in that a step for supporting the elastic member on the inner extending portion and the bearing, respectively.

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