CN112780588B - Fan with fan body - Google Patents

Abstract

The invention discloses a fan, which comprises: a fan frame, a motor, an impeller, a circuit board and a cladding layer; a motor base is arranged at the center of the fan frame; the motor is installed on the motor base, and includes a rotor and a stator And the bearing unit, the stator is set around the bearing unit, the rotor is set on the stator and the bearing unit; the impeller is installed on the motor; the circuit board is set between the stator and the motor base, and there are multiple electronics on one surface Components; wherein, the cladding layer covers the stator and the circuit board, so that a specific thickness of the cladding layer is evenly distributed on multiple electronic components. The surface of the electronic component of the present invention is evenly covered with a cladding layer of a specific thickness, thereby avoiding internal stress caused by uneven thickness, and preventing problems such as falling off of the electronic component and fan failure.

Description

fan

technical field

The invention relates to a fan, in particular to a fan with thick meat design to prevent internal electronic components from falling off.

Background technique

With the rapid development of the high-tech industry, various electronic devices have become very important in our lives. As we all know, the heat dissipation efficiency of electronic equipment will affect the operation stability and service life of the entire system. In order to improve the heat dissipation efficiency and operation stability of the electronic equipment, fans are usually installed in the electronic equipment or in its surroundings to cool the electronic equipment so that its performance will not deteriorate due to overheating.

FIG. 1 is a schematic cross-sectional structure diagram of a conventional fan. As shown in FIG. 1 , a conventional fan 1 includes an impeller 10 , a rotor 11 , a stator 12 , a bearing unit 13 , a fan frame 14 and a circuit board 16 . The impeller 10 is installed on the rotor 11, and the rotor 11, the stator 12 and the bearing unit 13 together constitute a motor. The stator 12 is disposed around the bearing unit 13 , and the stator 12 drives the rotor 11 and the impeller 10 to rotate. The bottom of the fan frame 14 includes a motor base 15 , and the motor base 15 is disposed at the center of the bottom of the fan frame 14 . The bearing unit 13 is correspondingly installed on the motor base 15 . The circuit board 16 is disposed between the stator 12 and the motor base 15 , and a plurality of electronic components 160 are arranged on a surface 161 of the circuit board 16 .

In the conventional fan 1, when the fan 1 is assembled, the filler 17 will be filled in the space between the circuit board 16 and the motor base 15, so as to protect the stator 12 and the circuit board 16 from external liquid and dust. erosion. As shown in the figure, when the filler 17 is filled in the internal space of the fan 1, although it can cover the surface 161 of the circuit board 16 and a plurality of electronic components 160 arranged thereon, however, due to the bottom of the fan frame 14 The inner surface 151 of the motor base 15 is flat, and in the conventional fan 1, the height h1 between the surface 161 of the circuit board 16 and the inner surface 151 of the motor base 15 is usually fixed, but each electronic component 160 However, the sizes and heights are different, so that when the filler 17 fills the periphery of the electronic components 160 covering the circuit board 16, its thickness will be different and uneven. In other words, the thickness of the filler 17 covered on the surface of each electronic component 160 is different, some parts are thicker and some parts are thinner. In this case, when the weather changes, the filler 17 will change accordingly. Thermal expansion or contraction occurs, but its thickness will affect the degree of thermal expansion or contraction, resulting in different internal stress, which will be applied to the electronic component 160 correspondingly, causing the electronic component 160 to be pulled by the internal stress and easy to loosen. Therefore, when the traditional fan 1 is used for a long time, the electronic components 160 will easily loosen or separate from the circuit board 16 due to the pulling of the aforementioned internal stress, and then cause the failure of the fan 1 .

Therefore, how to develop a fan that can improve the problems encountered in the prior art is one of the important issues.

Contents of the invention

An object of the present invention is to provide a fan. By planning the thickness of the motor base of the fan frame, the inner surface corresponds to the position and height of the electronic components and the corresponding depression, and then fills the space with a coating layer, so as to The surface of the electronic component is evenly covered with a coating layer of a specific thickness, thereby avoiding internal stress caused by uneven thickness, and preventing problems such as falling off of the electronic component and fan failure.

Another object of the present invention is to provide a fan. By directly planning the thickness of the motor during the injection molding of the fan frame, the coating layer is directly molded and coated on the circuit board, and the bottom surface corresponds to the electronic component. The position and height are protruding or concave, so that the surface of the electronic component is uniformly covered with a coating layer of a specific thickness, thereby avoiding internal stress caused by uneven thickness, and preventing problems such as falling off of electronic components and fan failure.

According to the conception of the present invention, the present invention provides a fan, comprising: a fan frame with a motor base at its center; a motor mounted on the motor base and including a rotor, a stator, and a bearing unit, the stator surrounding the bearing The rotor is installed on the stator and the bearing unit; the impeller is installed on the motor; the circuit board is installed between the stator and the motor base, and has a plurality of electronic components on the first surface of the circuit board; and a coating layer; wherein, the coating layer covers the stator and the circuit board, so that a specific thickness of the coating layer is evenly distributed on the plurality of electronic components.

According to the idea of the present invention, the specific thickness is between 0.8mm and 2mm.

According to the idea of the present invention, the motor base of the fan has a second surface, and the thickness of the second surface is planned according to a plurality of correspondingly arranged electronic components.

According to the idea of the present invention, a plurality of recesses are arranged on the second surface according to the thickness plan, and the positions and depths of the plurality of recesses correspond to the positions and heights of the plurality of electronic components.

According to the idea of the present invention, the specific thickness of the cladding layer is defined by the distance from the surface of the electronic component to the surface of the recess.

According to the idea of the present invention, the width of the concave portion is greater than the width of the electronic component.

According to the idea of the present invention, two sides of the electronic component each have a glue overflow space for the filling material to flow into the recess.

According to the idea of the present invention, the width of the glue overflow space is between 1.0mm and 1.5mm.

According to the idea of the present invention, the motor is manufactured by injection molding process, and the thickness of the motor is directly planned during injection molding.

According to the idea of the present invention, the thickness of the meat is planned to make the cladding layer be directly molded and coated on the circuit board, the cladding layer has a third surface, and the third surface is corresponding to the position and height of the electronic components and is provided with a plurality of depressions And the protruding part, so that the cladding layer with a specific thickness is evenly distributed on the plurality of electronic components.

According to the idea of the present invention, the rotor of the motor has a top surface, and the top surface has a plurality of through holes for maintaining ventilation.

According to the conception of the present invention, the present invention provides a fan, comprising: a fan frame with a motor base at its center; a motor mounted on the motor base and including a rotor, a stator, and a bearing unit, the stator surrounding the bearing The rotor is installed on the stator and the bearing unit; the impeller is installed on the motor; the circuit board is installed between the stator and the motor base, and has a plurality of electronic components on the first surface of the circuit board; And wherein the motor base has a second surface, a plurality of recesses are arranged on the second surface, and the positions and depths of the recesses correspond to the positions and heights of the electronic components.

According to the idea of the present invention, one of the plurality of recesses may correspond to a plurality of the plurality of electronic components having the same height.

In the fan provided by the present invention, the meat thickness planning is carried out for the position and height of the electronic components. In one embodiment, by planning the thickness of the motor base of the fan frame, the second surface is corresponding to the position and height of the electronic components, and then the coating layer is filled in this space, so that the electronic components The surface is uniformly covered with a cladding layer of a specific thickness. In another embodiment, by directly planning the thickness of the motor during injection molding, the cladding layer is directly molded on the circuit board, and the third surface is protruded or recessed corresponding to the position and height of the electronic components , so that the surface of the electronic component is uniformly covered with a cladding layer of a specific thickness, and at the same time, the cladding layer is conformal to the electronic component (that is, the shape of the third surface of the cladding layer is consistent with the shape of the electronic component). Using the aforementioned two implementations, the cladding layer can be kept at a uniform specific thickness, and this specific thickness is lighter and thinner than the previous technology, thereby avoiding internal stress caused by uneven thickness, and preventing electronic components from falling off, fan failures, etc. . In addition, through the pretreatment process of the circuit board or motor, the adhesion between the electronic components and the circuit board is enhanced, and the structural strength is enhanced. Therefore, the fan of the present invention not only achieves the purpose of waterproofing and dustproofing, but also improves the temperature tolerance of the fan, and at the same time, due to the thickness planning of the different positions and heights of the electronic components, the situation of falling off of electronic components and fan failures is further reduced. , and prolong the service life of the fan.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of a conventional fan.

Fig. 2 is a schematic diagram of the exploded structure of the fan according to the preferred embodiment of the present invention.

FIG. 3 is a structural schematic diagram of the stator and the circuit board of the fan shown in FIG. 2 .

FIG. 4 is a schematic structural diagram of a fan frame of the fan shown in FIG. 2 .

FIG. 5 is a schematic cross-sectional structure diagram of the fan shown in FIG. 2 .

FIG. 6 is a partially enlarged schematic view of the fan shown in FIG. 5 .

FIG. 7 is a schematic diagram of an exploded structure of a fan according to another preferred embodiment of the present invention.

FIG. 8 is a schematic diagram of another exploded structure of the fan shown in FIG. 7 .

Among them, reference signs:

1, 2, 3: Fan

10, 22, 32: impeller

11, 23, 33: rotor

12, 24, 34: Stator

13, 25, 35: bearing unit

14, 20, 30: fan frame

15, 28, 38: Motor base

151: inner surface

16, 26, 36: circuit board

160, 260, 360: electronic components

161: surface

261, 361: first surface

17: filler

21, 31: motor

221: hub

222: blade

231: metal shell

232: magnet

241: Stator seat

242: Coil

243: Fastening elements

250: shaft

251: Bearing sleeve

252: Bearing

260a: Underfill

27, 37: cladding layer

281: Annular Wall

282: Accommodating Space

283, 383: second surface

283a: Recess

283b: Convex part

284: opening

330: top surface

330a: through hole

370: Third Surface

370a: depressed part

370b: Protrusion

h1: height

w1, w2: width

t: specific thickness

Detailed ways

Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the present invention can have various changes in different aspects without departing from the scope of the present invention, and the description and drawings therein are used for illustration in nature rather than limiting the present invention.

Fig. 2 is a schematic diagram of the exploded structure of the fan according to the preferred embodiment of the present invention. FIG. 3 is a structural schematic diagram of the stator and the circuit board of the fan shown in FIG. 2 . FIG. 4 is a schematic structural diagram of a fan frame of the fan shown in FIG. 2 . FIG. 5 is a schematic cross-sectional structure diagram of the fan shown in FIG. 2 . FIG. 6 is a partially enlarged schematic view of the fan shown in FIG. 5 . As shown in Figure 2, the fan 2 of the first preferred embodiment of the present invention includes a fan frame 20, a motor 21, an impeller 22, a circuit board 26 and a cladding layer 27 (as shown in Figure 5), wherein the center of the fan frame 20 The position is provided with a motor base 28 (as shown in FIG. 4 ). The motor 21 is mounted on a motor base 28 and is composed of a rotor 23 , a stator 24 and a bearing unit 25 . The stator 24 is disposed around the bearing unit 25 , and the rotor 23 is sleeved on the stator 24 and the bearing unit 25 correspondingly. The bearing unit 25 also has a rotating shaft 250 connected to the center of the impeller 22 so that the impeller 22 is installed on the motor 21 . The operation of the motor 21 further drives the rotor 23 and the impeller 22 to rotate. The circuit board 26 is sleeved between the stator 24 and the motor base 28 , and a first surface 261 of the circuit board 26 (ie, a surface facing the motor base 28 ) has a plurality of electronic components 260 . As shown in Fig. 5 and Fig. 6, the fan 2 of this embodiment also includes a coating layer 27, which covers the stator 24 and the circuit board 26, so that the plurality of electronic components 260 on the first surface 261 of the circuit board 26 A cladding layer 27 of a specific thickness t is evenly laid on it.

Please refer to Figure 2, Figure 3 and Figure 5 at the same time. As shown in FIG. 2 , in this embodiment, the impeller 22 includes a hub 221 and a plurality of blades 222 . The blades 222 are disposed around the outer periphery of the hub 221 . In some embodiments, the blade 222 and the hub 221 can be but not limited to a one-piece structure, and can be made by an injection molding process. As shown in FIGS. 2 and 5 , the rotor 23 includes a metal shell 231 and a plurality of magnets 232 . The magnet 232 is installed on the inner surface of the side wall of the metal case 231 and faces the stator 24 . As shown in FIG. 3 , the stator 24 includes a stator base 241 and at least one coil 242 . The stator base 241 also includes at least one fastening element 243 . And, the circuit board 26 includes a first surface 261 and a plurality of electronic components 260 , wherein the plurality of electronic components 260 are arranged on the first surface 261 . In this embodiment, the circuit board 26 is a hollow ring-shaped plate structure, which is sheathed on the lower part of the stator seat 241 of the stator 24, and is fixedly arranged on the stator seat 241 through the fastening element 243 on the stator seat 241. .

In some embodiments, the circuit board 26 may undergo a pretreatment process to enhance the adhesion between the electronic component 260 and the circuit board 26 . The pretreatment procedure may be, but not limited to, soaking the circuit board 26 in moisture-proof glue, performing nano-plating, or filling an underfill agent 260 a at the bottom of the electronic component 260 . As shown in FIG. 3 , in this embodiment, the underfill agent 260a is applied to the first surface 261 of the circuit board 26, and it is coated on the bottom of the electronic component 260 to enhance the contact between the electronic component 260 and the circuit board 26. Adhesion. However, the pretreatment procedure here can be varied according to the actual implementation situation, and is not limited to the underfill 260a exemplified in the present invention. In other embodiments, the material of the underfill 260a may be but not limited to epoxy resin.

Please continue to refer to FIG. 2 , FIG. 4 and FIG. 5 . As shown in FIG. 4 , the fan frame 20 is a hollow frame structure, and a motor base 28 is disposed at the center thereof. The motor base 28 includes an annular wall 281, an accommodating space 282 and a second surface 283 (ie, the surface facing the circuit board 26), wherein the accommodating space 282 is defined by the annular wall 281, and the second surface 283 is the annular wall 281 bottom surface. In this embodiment, the motor base 28 includes a plurality of recesses 283 a and a plurality of protrusions 283 b formed on the second surface 283 of the motor base 28 . The second surface 283 of the motor base 28 forms a stepped surface due to the uneven structures of the concave portion 283 a and the convex portion 283 b, but the invention is not limited thereto. In some embodiments, the plurality of recesses 283a and the plurality of protrusions 283b may be alternately arranged, that is, the recesses 283a may span between the protrusions 283b, but not limited thereto. Wherein, the positions and heights of the plurality of concave parts 283a and convex parts 283b are pre-designed through a thickness planning. Specifically, the thickness planning of the motor base 28 is designed according to the position and height of the corresponding electronic components 260 on the first surface 261 of the circuit board 26 . And, the motor base 28 also has a plurality of openings 284 , and the openings 284 pass through the motor base 28 to communicate the accommodating space 282 with the outside world. In some other embodiments, the fan frame 20 can be made by injection molding process, but not limited thereto.

Please refer to FIG. 2 and FIG. 5 at the same time. As shown in the figure, the bearing unit 25 includes a bearing sleeve 251 , a bearing 252 and a rotating shaft 250 , and the rotating shaft 250 is connected to the center of the impeller 22 . The bearing housing 251 is connected to the motor base 28 and is located at a central portion of the motor base 28 . The bearing 252 is accommodated in the bearing sleeve 251 , and the rotating shaft 250 passes through the bearing 251 . The stator 24 is disposed around the outer periphery of the bearing sleeve 251 and fixed to the bearing sleeve 251 . The fan frame 20 is arranged outside the fan 2 and surrounds the impeller 22 , the rotor 23 , the stator 24 and the bearing unit 25 . The circuit board 26 is fixed on the bottom of the stator 24 and sleeved between the stator 24 and the motor base 28 . It can be seen from FIG. 5 that when the impeller 22, the rotor 21, the stator 22, the bearing unit 23 and the fan frame 20 of the fan 2 are assembled, the circuit board 26 is correspondingly arranged in the accommodation space 282 of the motor base 28, and the circuit board 26 The first surface 261 of the motor base 28 faces the second surface 283 . At this time, taking this embodiment as an example, a filling material is filled into the fan 2 through the opening 284 of the motor base 28, and the filling material will fill the accommodating space 282 communicating with the opening 284, and then cover the stator 24. And the circuit board 26, and then solidified to form the coating layer 27 with a specific thickness of the present invention, so as to protect the stator 24 and the circuit board 26 from external liquid and dust, and achieve the purpose of waterproof and dustproof.

In some embodiments, the filling material of the covering layer 27 can be but not limited to fluid colloid, for example, it can be a waterproof material, and the waterproof material can be but not limited to epoxy resin, silicone resin or Polyurethane. In some other embodiments, the curing method of the cladding layer 27 can be to quickly cool the filling material at a low temperature, or to heat the filling material at a high temperature to solidify the filling material, and the curing method of the cladding layer 27 can be implemented according to actual conditions. The situation is subject to change and is not limited to this.

Please refer to Figure 5 and Figure 6 at the same time. As shown in the figure, since the second surface 283 of the motor base 28 facing the circuit board 26 has a plurality of concave portions 283 a and convex portions 283 b, it presents an uneven and stepped surface. However, as mentioned above, the thickness planning of the second surface 283 of the motor base 28 is designed according to the position and height of the electronic components 260 on the first surface 261 of the circuit board 26 . That is, it can be seen from FIG. 6 that the second surface 283 of the motor base 28 corresponding to the electronic component 260 on the first surface 261 of the circuit board 26 is provided with a corresponding recess 283a, wherein a plurality of recesses The position and depth of 283a correspond to the positions and heights of the plurality of electronic components 260, that is, the surface of the electronic component 260 and the surface of the concave portion 283a maintain a certain thickness t. In this embodiment, the width w2 of the concave portion 283a is larger than the width w1 of the electronic component 260, so that there is a glue overflow space on the left and right sides of the electronic component 260 for the filling material to flow into the concave portion 283a. In some embodiments, the glue overflow space has a width between 1.0 mm and 1.5 mm, but not limited thereto. In another embodiment, one of the recesses 283a may correspond to a plurality of electronic components 260 having the same height.

And, as shown in the figure, through the thickness planning of the motor base 28 of the present invention, the surface of the electronic component 260 and the surface of the recess 283a of the motor base 28 maintain a specific thickness t; in other words, the specific thickness t is It is defined by the distance from the surface of the electronic component 260 to the surface of the concave portion 283a. Therefore, when the filling material flows into the concave portion 283a from the glue overflow space reserved on both sides of the electronic component 260, and is cured to form the coating layer 27, the coating layer 27 can evenly cover the multiple electronic components 260 with a specific thickness t. That is, each electronic component 260 is covered with a coating layer 27 with a uniform thickness, thereby avoiding problems such as internal stress pulling the electronic component 260 due to its uneven thickness, causing the electronic component 260 to loosen and fall off. In some embodiments, the specific thickness t ranges from 0.8 mm to 2 mm, but not limited thereto. In this way, the cladding layer 27 can not only protect the circuit board 26, waterproof and dustproof, but also maintain the surface of the electronic component 260 through the thickness planning of the second surface 283 of the motor base 28 of the present invention. A uniform specific thickness t, and this specific thickness t is lighter and thinner than the fixed thickness of the prior art, thereby avoiding the internal stress generated by thermal expansion and contraction, causing the electronic component 260 to fall off from the circuit board 26 and be damaged, and cause Faulty fan 2, etc.

Please refer to Figure 7 and Figure 8. Fig. 7 is a schematic exploded structure diagram of a fan according to another preferred embodiment of the present invention. FIG. 8 is a schematic diagram of another exploded structure of the fan shown in FIG. 7 . As shown in the figure, the fan 3 of the present embodiment also includes a fan frame 30, a motor 31, an impeller 32, a circuit board 36 and a cladding layer 37 (as shown in FIG. 8 ), wherein the motor 31 is composed of a rotor 33, a stator 34 and bearings. The units 35 are jointly formed, and a plurality of electronic components 360 are also arranged on the first surface 361 of the circuit board 36 . In this embodiment, the detailed structures and installation positions of the impeller 32 , the stator 34 , the bearing unit 35 and the circuit board 36 are the same as those in the previous embodiment, so they are not repeated here. In this embodiment, the difference from the previous embodiments lies in that the thickness planning of the electronic components 360 on the first surface 361 of the circuit board 36 in this embodiment is different from the previous embodiments. In other words, the thickness planning of this embodiment is not arranged on the motor base 38 of the fan frame 30 . Instead, after the motor 31 is assembled, the motor 31 is directly subjected to low-pressure injection molding, so that the coating layer 37 is directly molded on the motor 31 and covers the stator 34 and the circuit board 36 . That is, in this embodiment, a flesh thickness planning is directly carried out when the motor 31 is injection molded. And, in this embodiment, there are a plurality of through holes 330a on the top surface 330 of the rotor 33, and the through holes 330a are used to enable the motor 31 to maintain ventilation when the filling material is filled, and then the upper surface of the circuit board 36 can be lowered. stress to avoid air trapping. Furthermore, as shown in FIG. 8 , the fan 3 of the present embodiment is filled with filling materials into the motor 31 and then through an injection molding process to make the motor 31 with a thickness plan. As shown in the figure, the coating layer 37 covers the first surface 361 of the circuit board 36 and the electronic components 360 thereon, and the third surface 370 of the coating layer 37 (that is, the surface facing the motor base 38) is On the uneven and stepped surface, a plurality of concave portions 370a and protruding portions 370b are arranged on it, and the plurality of concave portions 370a and protruding portions 370b are set corresponding to the position and height of the electronic component 360 . In other words, in this embodiment, when the motor 31 is injection molded, the thickness of the electronic component 360 has been planned, so the molded cladding layer 37 has an uneven stepped surface, and it is still maintained at A cladding layer 37 with a specific thickness t is evenly provided on the plurality of electronic components 360 . Certainly, same as the foregoing embodiments, the specific thickness t is in the range of 0.8 mm to 2 mm, but not limited thereto. And in order to prevent the internal stress of pulling on the periphery of the electronic component 360, its periphery also has a glue overflow space similar to the width of the previous embodiment, and this width is also between 1.0mm and 1.5mm, but it is not limited thereto. .

Also in this embodiment, the motor 31 can also undergo a pretreatment process, and the pretreatment process can also be but not limited to soaking moisture-proof glue, performing nano-plating, or filling an underfill agent at the bottom of the electronic component 360, so as to The adhesion between the electronic component 360 and the circuit board 36 is enhanced, but not limited thereto.

To sum up, the present invention provides a fan, in which the meat thickness is planned for the position and height of the electronic components. In one embodiment, by planning the thickness of the motor base of the fan frame, the second surface is corresponding to the position and height of the electronic components, and then the coating layer is filled in this space, so that the electronic components The surface is uniformly covered with a cladding layer of a specific thickness. In another embodiment, by directly planning the thickness of the motor during injection molding, the cladding layer is directly molded on the circuit board, and the third surface is protruded or recessed corresponding to the position and height of the electronic components , so that the surface of the electronic component is uniformly covered with a cladding layer of a specific thickness, and at the same time, the cladding layer is conformal to the electronic component (that is, the shape of the third surface of the cladding layer is consistent with the shape of the electronic component). Using the aforementioned two implementations, the cladding layer can be kept at a uniform specific thickness, and this specific thickness is lighter and thinner than the previous technology, thereby avoiding internal stress caused by uneven thickness, and preventing electronic components from falling off, fan failures, etc. . In addition, through the pretreatment process of the circuit board or motor, the adhesion between the electronic components and the circuit board is enhanced, and the structural strength is enhanced. Therefore, the fan of the present invention not only achieves the purpose of waterproofing and dustproofing, but also improves the temperature tolerance of the fan, and at the same time, due to the thickness planning of the different positions and heights of the electronic components, the situation of falling off of electronic components and fan failures is further reduced. , and prolong the service life of the fan.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection defined by the appended claims of the present invention.

Claims (12)

1. A fan, characterized in that it comprises: a frame with a motor base at its center; A motor, installed on the motor base, and includes a rotor, a stator and a bearing unit, the stator is arranged around the bearing unit, and the rotor is sleeved on the stator and the bearing unit; an impeller mounted on the motor; a circuit board nestled between the stator and the motor base and having a plurality of electronic components on a first surface of the circuit board; and a cladding layer; Wherein, the cladding layer covers the stator and the circuit board, so that the cladding layer of a specific thickness is evenly distributed on the electronic components; The motor base of the fan has a second surface, and a thickness planning is performed on the second surface according to the corresponding electronic components; the thickness planning is provided with a plurality of recesses on the second surface, and the recesses The positions and depths correspond to the positions and heights of the electronic components. 2. The fan according to claim 1, wherein the specific thickness is between 0.8mm and 2mm. 3 . The fan according to claim 1 , wherein the specific thickness of the covering layer is defined by the distance between the surfaces of the electronic components and the surfaces of the recesses. 4 . 4. The fan according to claim 1, wherein the width of the recesses is greater than the width of the electronic components. 5 . The fan according to claim 1 , wherein two sides of the electronic components each have a glue overflow space for a filling material to flow into the recesses. 6 . 6 . The fan according to claim 5 , wherein the glue overflow space has a width between 1.0 mm and 1.5 mm. 7 . The fan according to claim 1 , wherein the motor is manufactured through an injection molding process, and a thickness planning is directly performed on the motor during injection molding. 8. The fan according to claim 7, wherein the thickness is planned so that the cladding layer is directly formed and clad on the circuit board, and the cladding layer has a third surface, and the third surface Corresponding to the positions and heights of the electronic components, a plurality of concave parts and protruding parts are correspondingly arranged, so that the covering layer with the specific thickness is evenly distributed on the electronic components. 9 . The fan according to claim 8 , wherein the rotor of the motor has a top surface, and the top surface has a plurality of through holes for maintaining ventilation. 10. A fan, characterized in that it comprises: a frame with a motor base at its center; A motor, installed on the motor base, and includes a rotor, a stator and a bearing unit, the stator is arranged around the bearing unit, and the rotor is sleeved on the stator and the bearing unit; an impeller mounted on the motor; a circuit board nestled between the stator and the motor base and having a plurality of electronic components on a first surface of the circuit board; and Wherein, the motor base has a second surface, and a plurality of recesses are arranged on the second surface, and the positions and depths of the recesses correspond to the positions and heights of the electronic components; There is a glue overflow space for a filling material to flow into the recess, and the width of the glue overflow space is between 1.0 mm and 1.5 mm. 11. The fan according to claim 10, wherein the width of the recesses is greater than the width of the electronic components. 12 . The fan according to claim 10 , wherein one of the recesses corresponds to a plurality of the electronic components having the same height. 13 .

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