Motor device for a fan

Abstract

A motor device applied to a fan, comprising an axle, two bearing modules, a housing module, an outer rotor module, a heat dissipation disc and an inner stator module. The bearing modules are arranged along the axial direction and spaced apart from each other. The housing module is arranged on the bearing modules and can rotate around the axle. The heat dissipation disc is sleeved on the axle and located in the housing module. The inner stator module comprises a stator ring part surrounding the axle and spaced apart from the axle, and a plurality of windings wound on the stator ring part, the windings being located at the orthographic projection of the heat dissipation disc along the axial direction. Through the above arrangement, the inner stator module can dissipate heat through the heat dissipation disc, and can provide a heat dissipation air duct through the gap with the axle, so as to improve the heat dissipation effect.

Description

Technical Field

[0001] This invention relates to a power device, and more particularly to a motor device used in a fan. Background Technology

[0002] The mainstream motor design used in fans currently employs an inner stator module paired with an outer rotor module. The fan blades are positioned outside the outer rotor module, while the inner stator module is fixedly mounted around the motor shaft, allowing the outer rotor module to directly drive the fan blades. However, in this design, because the inner stator module is located at the center of the structure, heat from the windings of the inner stator module is not easily dissipated during motor operation. Over time, this can easily lead to overheating and malfunctions. Summary of the Invention

[0003] The purpose of this invention is to provide a motor device for a fan that can improve heat dissipation.

[0004] The present invention relates to a motor device for a fan, comprising a shaft, two bearing modules, a housing module, an outer rotor module, a heat sink, and an inner stator module.

[0005] The axis extends along the axial direction.

[0006] The bearing modules are spaced apart at the center of the shaft along the axial direction.

[0007] The outer casing module surrounds the axis, and both ends of the outer casing module along the axial direction are respectively disposed on the bearing module, so that it can rotate around the axis.

[0008] The outer rotor module is disposed around the axis in the outer casing module.

[0009] The heat sink is fitted onto the shaft and located inside the outer casing module.

[0010] The inner stator module is disposed on the heat sink corresponding to the outer rotor module and is located inside the outer casing module. The inner stator module includes a stator ring portion surrounding the shaft and having a distance from the shaft, and a plurality of windings surrounding the shaft and wound around the stator ring portion. The windings are located at the orthogonal projection of the heat sink along the axial direction.

[0011] The present invention relates to a motor device for a fan, wherein the heat sink is made of aluminum.

[0012] The present invention relates to a motor device for a fan, wherein the heat sink includes a mounting ring portion surrounding a central axis and a heat dissipation ring portion surrounding the mounting ring portion, and the winding is located at the orthogonal projection of the heat dissipation ring portion along the axial direction.

[0013] The present invention relates to a motor device for a fan, wherein the shaft has a radially extending flange for engaging the mounting ring portion.

[0014] The present invention relates to a motor device for a fan, wherein the inner stator module further includes a plurality of assembly portions extending from the stator ring portion and used for assembly onto the heat sink, wherein the radial distance between the inner side surface of the stator ring portion and the axis is less than the radial length of the winding.

[0015] The motor device of the present invention for a fan further includes a thermally conductive film disposed on the heat sink and located between the heat sink and the winding.

[0016] The present invention relates to a motor device for a fan, wherein the outer rotor module is disposed inside the outer housing module surrounding the inner stator module.

[0017] The present invention relates to a motor device for a fan, wherein the housing module includes an upper cover, a housing, and a lower cover surrounding the axis, the upper cover and the lower cover being respectively disposed on the bearing module, the two ends of the housing along the axial direction being respectively connected to the upper cover and the lower cover, the housing surrounding the heat sink and the inner stator module and providing space for the outer rotor module to be disposed on the inner side.

[0018] The present invention relates to a motor device for a fan, wherein the housing module includes a barrel-shaped upper cover and a disc-shaped lower cover surrounding the shaft, the upper cover and the lower cover are respectively disposed on the bearing module, the upper cover is disposed around the heat sink and the inner stator module, and the outer rotor module is disposed on the inner side.

[0019] The beneficial effects of the present invention are as follows: by setting the heat sink sleeved on the shaft, setting the inner stator module on the heat sink, and spacing the stator ring portion and the shaft at the specified distance, not only can the inner stator module be provided with heat dissipation through the heat sink, but also an air duct can be provided through the gap between the stator ring portion and the shaft. When the airflow passes through the gap, it can also help to remove the heat energy of the winding. Therefore, the heat dissipation effect of the motor can be significantly improved. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the first embodiment of the present invention applied to a fan motor device;

[0021] Figure 2 This is an exploded perspective view of the first embodiment;

[0022] Figure 3 This is a three-dimensional exploded view of the first embodiment from another perspective;

[0023] Figure 4 This is a cross-sectional schematic diagram of a second embodiment of the present invention applied to a fan motor device. Detailed Implementation

[0024] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description.

[0025] See Figure 1 , Figure 2 and Figure 3 The first embodiment of the present invention applied to a fan motor device includes a shaft 2, two bearing modules 3, a housing module 4, an outer rotor module 5, a heat sink 6, and an inner stator module 7. Optionally, the first embodiment may also include a thermally conductive film 8.

[0026] The shaft 2 is a hollow tube extending along an axial direction L and has a radially extending annular flange 21.

[0027] The bearing modules 3 are spaced apart along the axial direction L on the shaft center 2, and can be implemented, for example, using ball bearings.

[0028] The outer casing module 4 surrounds the axis 2, and its two ends along the axial direction L are respectively disposed on the bearing module 3, allowing it to rotate around the axis 2. The outer casing module 4 includes an upper cover 41, a housing 42, and a lower cover 43 surrounding the axis 2.

[0029] The upper cover 41 is generally barrel-shaped, the housing 42 is generally hollow cylindrical, and the lower cover 43 is generally disc-shaped. The upper cover 41 and the lower cover 43 are spaced apart along the axial direction L and are respectively arranged around the bearing module 3, and can rotate around the axis 2 via the bearing module 3. The housing 42 is located between the upper cover 41 and the lower cover 43 and surrounds the heat sink 6 and the inner stator module 7. The two ends of the housing 42 along the axial direction L are respectively connected to the upper cover 41 and the lower cover 43. The housing 42, together with the upper cover 41 and the lower cover 43, defines an accommodating space 44, which is used to accommodate the heat sink 6 and the inner stator module 7.

[0030] In this embodiment, the upper cover 41 and the lower cover 43 are assembled by multiple bolts 45, but they can also be assembled by fitting, snapping, or other methods, and are not limited to this.

[0031] It is worth noting that the upper cover 41 and the lower cover 43 can also selectively form multiple through holes (not shown) or heat dissipation fins (not shown) to improve heat dissipation efficiency.

[0032] The outer rotor module 5 is disposed around the shaft 2 and the inner stator module 7 on the outer casing module 4, for example, on the inner side of the casing 42. When the motor device is operating, the outer rotor module 5 rotates around the shaft 2, and drives the outer casing module 4 to rotate synchronously around the shaft 2, thereby causing the multiple fan blades (not shown) connected to the outer casing module 4 to also rotate.

[0033] The heat sink 6 is generally disc-shaped, with the shaft 2 passing through its center point and fitted onto the shaft 2, located within the accommodating space 44 of the outer casing module 4. The heat sink 6 is made of a metal such as aluminum, aluminum alloy, or copper. The heat sink 6 includes a mounting ring 61 surrounding the shaft 2 and a heat dissipation ring 62 surrounding the mounting ring 61. The mounting ring 61 is annular and abuts against the flange 21 of the shaft 2. Figure 1 The upper and middle plane allows the mounting ring 61 to engage with the flange 21. The heat dissipation ring 62 extends radially outward from the mounting ring 61 and is ring-shaped. In this embodiment, the heat sink 6 and the inner stator module 7 are assembled by locking with multiple bolts 63, but they can also be assembled by fitting, snapping, or other methods, and are not limited to this.

[0034] The inner stator module 7 is disposed on the heat sink 6 corresponding to the outer rotor module 5, and the accommodating space 44 located in the outer shell module 4 includes a stator ring 71, multiple windings 72 and multiple assembly parts 73.

[0035] The stator ring portion 71 is generally annular, surrounds the shaft 2, and is spaced from the shaft 2 by a distance d1. The radial distance d1 between the inner side of the stator ring portion 71 and the shaft 2 is less than the radial length d2 of the winding 72.

[0036] The winding 72 surrounds the shaft 2 and is wound around the stator ring 71. For clarity in the drawings, only the portion shown is described below. Figure 1The winding 72 is drawn. Those skilled in the art will understand that the winding 72 is wound around the remaining corresponding positions of the stator ring portion 71. The winding 72 is located at the orthographic projection of the heat sink 6 along the axial direction L, for example, at the orthographic projection of the heat sink ring portion 62 along the axial direction L. That is, the heat sink ring portion 62 of the heat sink 6 is positioned corresponding to the winding 72, and the radial region of the heat sink ring portion 62 is made to coincide as much as possible with the radial region of the winding 72, and the winding 72 and the heat sink ring portion 62 are brought close together along the axial direction L to improve the heat dissipation efficiency of the winding 72 through the heat sink 6. For example, the distance d3 between the winding 72 and the heat sink 6 along the axial direction L is designed to be less than the distance d1 between the stator ring portion 71 and the shaft 2, or less than 1 / 3 of the length d2, or less than 2 mm, or approximately equal to the thickness of the thermally conductive film 8.

[0037] The assembly part 73 is columnar, extends along the axial direction L, and is connected to the inner side of the stator ring part 71, and is used for the bolts 63 to pass through and fix the assembly to the heat sink 6.

[0038] The thermally conductive adhesive sheet 8 is attached to the heat sink 6 and located between the heat sink 6 and the winding 72. By matching the distance d3 between the winding 72 and the heat sink 6 with the thickness of the thermally conductive adhesive sheet 8, the thermally conductive adhesive sheet 8 can be sandwiched between the heat sink 6 and the winding 72, thereby further improving heat dissipation efficiency through heat conduction during contact. The thermally conductive adhesive sheet 8 is a medium with thermally conductive properties, such as a thermally conductive soft material (e.g., a thermally conductive silicone sheet). The thermally conductive silicone sheet is made of silicone as a base material and contains various auxiliary materials such as thermally conductive powder and flame retardants. The thermally conductive adhesive sheet 8 can also be replaced with thermally conductive adhesive, which can also achieve the effect of improving heat dissipation.

[0039] Based on the above explanation, the effects of this embodiment are as follows:

[0040] 1. By setting the heat sink 6 sleeved on the shaft 2 and placing the inner stator module 7 on the heat sink 6, and positioning the stator ring 71 at a distance d1 from the shaft 2, not only is a path for the winding 72 to dissipate heat via the heat sink 6 provided, but also an air duct is provided through the gap between the stator ring 71 and the shaft 2. When airflow passes through the gap, it also helps to remove the heat energy from the winding 72. Therefore, the heat dissipation effect of the motor can be significantly improved.

[0041] Second, by providing the thermally conductive film 8 between the heat sink 6 and the winding 72, the heat dissipation efficiency can be improved. Furthermore, the thermally conductive film 8 not only facilitates disassembly and assembly, but its insulation properties can also improve the insulation effect between the heat sink 6 and the winding 72.

[0042] See Figure 4 This is a second embodiment of the present invention applied to a fan motor device. The second embodiment is similar to the first embodiment, but the difference between the second embodiment and the first embodiment is:

[0043] The outer casing module 4 includes a barrel-shaped upper cover 41 and a disc-shaped lower cover 43 surrounding the shaft 2. The upper cover 41 and the lower cover 43 are respectively disposed on the bearing module 3, and the upper cover 41 and the lower cover 43 cooperate to define the accommodating space 44. The upper cover 41 is disposed around the heat sink 6 and the inner stator module 7, and allows the outer rotor module 5 to be disposed on the inner side.

[0044] The winding 72 of the inner stator module 7 is close to the heat sink 6, so that the winding 72 is close to or abuts against the heat sink ring 62, and the flange 21 is positioned close to the corresponding bearing module 3, so that the heat sink 6 is close to the lower cover 43.

[0045] Thus, the second embodiment can also achieve the same purpose and effect as the first embodiment described above. Furthermore, by omitting the housing 42 (see...) Figure 1 By placing the winding 72 close to the heat sink 6 and the flange 21 close to the corresponding bearing module 3, the length of the motor along the axial direction L can be reduced, thus making the second embodiment have a smaller volume.

[0046] In conclusion, the present invention, when applied to a fan motor device, does indeed achieve the purpose of the present invention.

[0047] The above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A motor device for use in a fan, comprising: a shaft extending along an axial direction, a housing module, an outer rotor module, and an inner stator module; Its features are: The motor device used in the fan also includes two bearing modules and a heat sink; The bearing modules are spaced apart at the center of the shaft along the axial direction; The outer casing module surrounds the axis, and both ends of the outer casing module along the axial direction are respectively disposed on the bearing module, so that it can rotate around the axis. The outer rotor module is disposed around the axis in the outer casing module; The heat sink is fitted onto the shaft and located inside the outer casing module; The inner stator module is disposed on the heat sink corresponding to the outer rotor module and is located inside the outer casing module. The inner stator module includes a stator ring portion surrounding the shaft and having a distance from the shaft, and a plurality of windings surrounding the shaft and wound around the stator ring portion. The windings are located at the orthogonal projection of the heat sink along the axial direction.

2. The motor device for a fan according to claim 1, characterized in that: The heat sink is made of aluminum.

3. The motor device for a fan according to claim 1, characterized in that: The heat sink includes a mounting ring portion surrounding the axis and a heat dissipation ring portion surrounding the mounting ring portion, and the winding is located at the orthogonal projection of the heat dissipation ring portion along the axis.

4. The motor device for a fan according to claim 3, characterized in that: The shaft has a radially extending flange for engaging the mounting ring.

5. The motor device for a fan according to claim 1, characterized in that: The inner stator module also includes a plurality of assembly parts extending from the stator ring portion and used for assembly onto the heat sink, wherein the radial distance between the inner side of the stator ring portion and the axis is less than the radial length of the winding.

6. The motor device for a fan according to claim 1, characterized in that: The motor device applied to the fan further includes a thermally conductive sheet disposed on the heat sink and located between the heat sink and the winding.

7. The motor device for a fan according to claim 1, characterized in that: The outer rotor module is disposed inside the outer shell module, surrounding the inner stator module.

8. The motor device for a fan according to claim 1, characterized in that: The outer casing module includes an upper cover, a housing, and a lower cover surrounding the axis. The upper cover and the lower cover are respectively disposed on the bearing module. The two ends of the housing along the axial direction are respectively connected to the upper cover and the lower cover. The housing surrounds the heat sink and the inner stator module and provides space for the outer rotor module to be disposed on the inner side.

9. The motor device for a fan according to claim 1, characterized in that: The outer casing module includes a barrel-shaped upper cover and a disc-shaped lower cover surrounding the axis. The upper cover and the lower cover are respectively disposed on the bearing module. The upper cover is disposed around the heat sink and the inner stator module, and the outer rotor module is disposed on the inner side.

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