Outer rotor motor of fan

Abstract

The utility model provides an external rotor motor of a fan, which comprises a base, a support column extending along the middle of one side of the base, a motor stator sleeved on the support column, 18 tooth crowns extending outwards along the outer circumference of the motor stator, and 18 tooth grooves formed by dividing the outer circumference of the motor stator by the 18 tooth crowns, a tooth crown is arranged on one side of the base, a stator tooth pole is arranged at the tail end of the tooth crown, a rotor assembly is arranged on the outer side of the motor stator and comprises an integrally-formed rotor iron core and 22 permanent magnets embedded in the rotor iron core, an electric control unit is arranged on the other side, away from the supporting column, of the base, a through hole is formed in the base, and the through hole is communicated with the rotor assembly. And the electric control unit is electrically connected with the motor stator through the through hole. By forming a 22-pole 18-slot structure, under the structure with the same length-diameter ratio, the motor stator and rotor assembly with smaller size can be used for outputting higher rotating speed and larger torque in a narrow scene, and the structure is more compact.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to an outer rotor motor of a fan. Background Art

[0002] Traditional electric motors have stators on the outside and rotors that rotate to generate power. External rotor motors have the opposite structure, with the stator in the middle of the motor and the rotor on the outside. External rotor fans use an advanced structure in which the external rotor motor directly drives the impeller and a reasonable aerodynamic design, and have the characteristics of high efficiency, low noise, light weight, compact structure, and easy installation and maintenance.

[0003] The utility model patent with publication number CN220470259U discloses an improved outer rotor fan, including a base, an oil-containing bearing, a stator assembly, a rotor, and a fan blade assembly. A tubular mounting seat is arranged on the upper side of the base, a magnet is arranged at the bottom of the inner cavity of the mounting seat, the stator assembly is arranged on the outer side of the mounting seat along the circumferential direction, the fan blade assembly includes a blade seat with an opening downward, at least three wind blades are evenly arranged on the outer wall of the blade seat along the circumferential direction, and a metal fan blade shaft is arranged on the lower side of the upper end cover of the blade seat. Its beneficial effects are: improving the fan mechanism, reducing the number of bearings, thereby reducing costs; simplifying the installation process and improving production efficiency; using a magnetic structure to ensure that no movement occurs during the operation of the fan.

[0004] However, the above scheme has the following defects. First, the number of stages and slots of the outer rotor motor used in the above fan cannot provide sufficient speed and torque in a compact volume in a small space. Second, the side wall of the rotor is directly connected and fixed to the blade seat in the same direction as the centrifugal force. This fixing method is not affected when the rotor rotates at a low speed and the volume of the wind blades on the rotor and the blade seat is not much different. However, if the rotor needs to rotate at a high speed and the volume of the rotor is very different from the volume of the wind blades on the blade seat, a huge centrifugal force will be generated when the rotor drives the blade seat to rotate, which makes the connection between the rotor and the blade seat unstable (from the material point of view, the rotor and the blade seat cannot be formed as one piece), and there is a risk of falling off between the two. Utility Model Content

[0005] In order to solve the above problems, the present application provides an assembly structure that can provide high-speed rotation and greater torque in a compact volume in a small space, and the rotor is connected to external components with better stability and a good heat dissipation environment. Specifically, it is an outer rotor motor of a fan, including a base, a support column extending along the middle of one side of the base, a motor stator is sleeved on the support column, 18 tooth crowns extending outward along the outer circumference of the motor stator, the gear is used to wind the coil, the 18 tooth crowns divide the outer circumference of the motor stator into 18 tooth slots, and a stator tooth pole is arranged at the end of the tooth crown. A rotor assembly is arranged on the outside of the motor stator, and the rotor assembly surrounds the motor stator. The rotor assembly includes an integrally formed rotor core and 22 permanent magnets embedded in the rotor core. An electronic control unit is arranged on the other side of the base away from the support column, and a first through hole is arranged on the base, and the electronic control unit is electrically connected to the motor stator through the first through hole.

[0006] Furthermore, a connection cover is sleeved on the outside of the motor stator, and the inner wall of the connection cover is tightly fitted with the outer wall of the rotor assembly.

[0007] Furthermore, a plurality of grooves are arranged at preset intervals inside the rotor core, and the permanent magnets are installed in the grooves by interference fit.

[0008] Furthermore, the support column is hollow, a main shaft is arranged inside the support column, and a support bearing is arranged between the main shaft and the support column.

[0009] Furthermore, a protective pad is provided between the main shaft and the support column, and the protective pad is provided on the end surface of the support bearing.

[0010] Furthermore, the connecting cover is cylindrical in shape and includes a side wall and a top surface. The inner wall of the side wall is tightly fitted with the outer wall of the rotor assembly. A second through hole is provided on the top surface. When the connecting cover is assembled with the rotor assembly, the main shaft is inserted into the second through hole.

[0011] Furthermore, a connecting surface is extended outwardly from one end of the side wall away from the top surface, and the connecting surface is perpendicular to the side wall.

[0012] Furthermore, a third through hole is provided on the connecting surface.

[0013] Furthermore, there is a distance between the connecting surface and the base.

[0014] Furthermore, the connection cover and the rotor core are integrally formed.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] Compared with the prior art, this application:

[0017] 1. Compared with the prior art, the present application forms a 22-pole 18-slot structure by designing 22 permanent magnets and 18 tooth slots. Therefore, under the structure with the same aspect ratio (i.e., the same thickness and length), the present application can use a smaller-sized motor stator and rotor assembly in a narrow scene to output a higher speed and greater torque, and the structure is more compact.

[0018] 2. In addition, the present application forms a fixation in a direction perpendicular to the rotor assembly by setting a connecting surface perpendicular to the side wall of the connecting cover and the functional part. In this way, when the rotor assembly rotates at a high speed, the connection direction between the connecting cover and the functional part is perpendicular to the direction of the centrifugal force. This can avoid the influence of the centrifugal force on the connection between the connecting cover and the functional part to the greatest extent, thereby further increasing the stability of the connection between the two.

[0019] 3. The rotor assembly of the present application will generate heat when rotating at high speed. The heat will generate wind along with the rotation of the rotor assembly and will flow out from between the connecting cover and the base to play a role in heat dissipation.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a schematic diagram of the overall structure of the outer rotor motor of the fan of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the motor stator and rotor assembly of the outer rotor motor of the fan of the utility model;

[0024] Figure 3 It is a schematic diagram of the base and internal structure of the outer rotor motor of the fan of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the connection cover of the fan of the utility model;

[0026] Figure 5This is a cross-sectional view of the overall structure of the outer rotor motor of the fan of the utility model.

[0027] The reference numerals and names in the figures are as follows:

[0028] Base 10, support column 11, motor stator 100, tooth crown 110, tooth slot 120, stator tooth pole 130, rotor assembly 200, rotor core 210, permanent magnet 220, electronic control unit 20, first through hole 12, connecting cover 300, groove 211, main shaft 13, support bearing 14, protective pad 15, side wall 310, top surface 320, second through hole 321, connecting surface 330, third through hole 331. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The utility model is described in more detail. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements between them. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements between them.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. In the description of the present utility model, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning, and therefore cannot be understood as limiting the scope of protection of the present utility model. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by technicians in the technical field of the utility model. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the utility model.

[0033] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0034] The preferred embodiments of the present invention are now further described in conjunction with the accompanying drawings. Figure 1 and Figure 2 As shown, an outer rotor motor of a fan comprises a base 10, a support column 11 extends along the middle of one side of the base 10, a motor stator 100 is sleeved on the support column 11, 18 tooth crowns 110 extend outward along the outer circumference of the motor stator 100, the tooth crowns 110 are used to wind coils (not shown in the figure), the 18 tooth crowns 110 divide the outer circumference of the motor stator 100 into 18 tooth slots 120, stator tooth poles 130 are arranged at the ends of the tooth crowns 110, a rotor assembly 200 is arranged on the outside of the motor stator 100, the rotor assembly 200 surrounds the motor stator 100, the rotor assembly 200 comprises an integrally formed rotor core 210 and 22 permanent magnets 220 embedded in the rotor core 210, an electric control unit 20 is arranged on the other side of the base 10 away from the support column 11, and a first through hole 120 is arranged on the base 10. 2. The electric control unit 20 is electrically connected to the motor stator 100 through the first through hole 12. When the electric control unit 20 is started, the electric control unit 20 sends an electrical signal to the motor stator 100. When the motor stator 100 is energized, a magnetic field is generated to drive the rotor assembly 200 to rotate around the motor stator 100. A connecting cover 300 is sleeved on the outside of the motor stator 100. The inner wall of the connecting cover 300 fits tightly with the outer wall of the rotor assembly 200. When the rotor assembly 200 rotates, the connecting cover 300 is driven to rotate synchronously. At the same time, the present application forms a 22-pole 18-slot structure by designing 22 permanent magnets 220 and 18 tooth slots 120. Therefore, under the structure of the same tooth slot 120 ratio, the present application can use a smaller size of the motor stator 100 and the rotor assembly 200 in a narrow scene to output a higher speed and a larger torque, and the structure is more compact.

[0035] Furthermore, if Figure 2As shown, a plurality of grooves 211 are provided inside the rotor core 210 at preset intervals, and the permanent magnets 220 are installed in the grooves 211 by interference fit. Compared with the existing structure in which a hole is opened inside the rotor core 210 and then the permanent magnets 220 are inserted, the processing of the rotor core 210 can be reduced, thereby improving production efficiency and reducing the waste of core materials.

[0036] Furthermore, if Figure 3 As shown, the support column 11 is hollow, a main shaft 13 is arranged inside the support column 11, and a support bearing 14 is arranged between the main shaft 13 and the support column 11, so that when the rotor assembly 200 rotates at a high speed, the main shaft 13 and the support bearing 14 in the support column 11 can cooperate with each other to strengthen the strength of the support column 11, thereby better supporting the rotor assembly 200.

[0037] Preferably, a protective pad 15 is provided between the main shaft 13 and the support column 11, and the protective pad 15 is arranged on the end face of the support bearing 14, so as to prevent water vapor or other debris from penetrating from the support bearing 14 between the main shaft 13 and the support column 11, thereby avoiding corrosion of the support column 11 and the main shaft 13.

[0038] Combination Figure 1 and Figure 4 As shown, the shape of the connecting cover 300 is cylindrical, and the connecting cover 300 includes a side wall 310 and a top surface 320. The inner wall of the side wall 310 is tightly fitted with the outer wall of the rotor assembly 200, and a second through hole 321 is arranged on the top surface 320. When the connecting cover 300 and the rotor assembly 200 are assembled, the main shaft 13 is inserted into the second through hole 321, which can guide the assembly between the connecting cover 300 and the rotor assembly 200. At the same time, when assembling the connecting cover 300, the second through hole 321 can also cooperate with the protective pad 15 to stop the installation of the connecting cover 300.

[0039] A connecting surface 330 is extended outwardly from one end of the side wall 310 away from the top surface 320, and the connecting surface 330 is perpendicular to the side wall 310. The function of the connecting surface 330 is to connect with an external functional part (not shown in the figure), and this connection is in a direction perpendicular to the rotor assembly 200. The functional part described above can be a blade seat or a tool seat, etc., which is not specifically limited here. In this way, by setting a connecting surface 330 perpendicular to the side wall 310 of the connecting cover 300 and the functional part, a fixation is formed in a direction perpendicular to the rotor assembly 200. In this way, when the rotor assembly 200 rotates at a high speed, the connection direction between the connecting cover 300 and the functional part is perpendicular to the direction of the centrifugal force. In this way, the influence of the centrifugal force and the connection between the connecting cover 300 and the functional part can be avoided to the greatest extent, thereby further increasing the stability of the connection between the two.

[0040] In the above embodiment, further, a third through hole 331 is provided on the connection surface 330 , and the functional component can be connected to the connection surface 330 by passing a screw through the third through hole 331 .

[0041] More preferably, combined with Figure 1 and Figure 5 As shown, there is a distance between the connecting surface 330 and the base 10. In this embodiment, the rotor assembly 200 generates heat when rotating at a high speed. The heat will generate wind along with the rotation of the rotor assembly 200 and will flow out from between the connecting cover 300 and the base 10, thereby achieving a heat dissipation effect.

[0042] Furthermore, the connection cover 300 and the rotor core 210 are integrally formed. Therefore, from the perspective of assembly, the rotor assembly 200 can be installed simultaneously when the connection cover 300 is assembled, which further simplifies the assembly process and saves the production cost of the enterprise.

[0043] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. The outer rotor motor of the fan is characterized in that: The invention comprises a base (10), a support column (11) extending from the middle of one side of the base (10), a motor stator (100) being sleeved on the support column (11), 18 tooth crowns (110) extending outwardly along the outer circumference of the motor stator (100), the 18 tooth crowns (110) dividing the outer circumference of the motor stator (100) into 18 tooth slots (120), a stator tooth pole (130) being arranged at the end of the tooth crown (110), and a rotor assembly being arranged on the outer side of the motor stator (100). The invention relates to a motor component (200), wherein the rotor component (200) surrounds the motor stator (100), and the rotor component (200) comprises an integrally formed rotor core (210) and 22 permanent magnets (220) embedded in the rotor core (210); an electric control unit (20) is arranged on the other side of the base (10) away from the support column (11); a first through hole (12) is arranged on the base (10); and the electric control unit (20) is electrically connected to the motor stator (100) through the first through hole (12).

2. The outer rotor motor of the fan according to claim 1, characterized in that: A connection cover (300) is sleeved on the outside of the motor stator (100), and the inner wall of the connection cover (300) is tightly fitted with the outer wall of the rotor assembly (200).

3. The outer rotor motor of the fan according to claim 1, characterized in that: A plurality of grooves (211) are arranged at preset intervals inside the rotor core (210), and the permanent magnets (220) are installed in the grooves (211) by interference fitting.

4. The outer rotor motor of the fan according to claim 2, characterized in that: The support column (11) is hollow, a main shaft (13) is arranged inside the support column (11), and a support bearing (14) is arranged between the main shaft (13) and the support column (11).

5. The outer rotor motor of the fan according to claim 4, characterized in that: A protective pad (15) is also provided between the main shaft (13) and the support column (11), and the protective pad (15) is provided on the end surface of the support bearing (14).

6. The outer rotor motor of the fan according to claim 5, characterized in that: The connection cover (300) is cylindrical in shape and comprises a side wall (310) and a top surface (320). The inner wall of the side wall (310) is tightly fitted with the outer wall of the rotor assembly (200). A second through hole (321) is provided on the top surface (320). When the connection cover (300) and the rotor assembly (200) are assembled, the main shaft (13) is inserted into the second through hole (321).

7. The outer rotor motor of the fan according to claim 6, characterized in that: A connecting surface (330) extends outwardly from one end of the side wall (310) away from the top surface (320), and the connecting surface (330) and the side wall (310) are perpendicular to each other.

8. The outer rotor motor of the fan according to claim 7, characterized in that: A third through hole (331) is provided on the connecting surface (330).

9. The outer rotor motor of the fan according to claim 7, characterized in that: There is a distance between the connecting surface (330) and the base (10).

10. The outer rotor motor of a fan according to claim 2, characterized in that: The connection cover (300) and the rotor core (210) are integrally formed.

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