Cooling fin structure and motor

Abstract

The present application provides a cooling fin structure and a motor. The cooling fin structure is installed in a manner surrounding the outer periphery of the motor and releases heat from the motor, and is characterized by having: a plurality of heat radiating fins projecting radially with respect to the axis of the motor and extending in parallel with respect to the axis of the motor, and having a hollow portion in which a refrigerant is enclosed in the interior; a plurality of connecting portions provided between the heat radiating fins at base end portions of the heat radiating fins and connecting the heat radiating fins in a cylindrical shape; a plurality of cover portions provided in a manner covering end portions of the heat radiating fins on both sides in the axial direction of the motor and sealing the hollow portion; and an adhesive tape provided between each end portion and each cover portion and fixing each cover portion to each end portion.

Description

Technical Field

[0001] The present invention relates to a cooling fin structure and a motor having a cooling fin structure. Background Technology

[0002] Previously, structures using heat sinks to cool motors were known. For example, Patent Document 1 describes a structure in which a fin assembly is provided on the outer peripheral surface of the motor housing.

[0003] The fin assembly has multiple hollow fins, a lower cover component with multiple feet forming openings that close the lower side of the fins, and an upper cover component with multiple feet forming openings that close the upper side of the fins. Cooling medium is filled inside the hollow fins, and the rotation of the rotor agitates the cooling medium, causing it to circulate and effectively cool the stator.

[0004] Existing technical documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-057994

[0006] In the fin assembly of Patent Document 1, the lower end of each hollow fin is closed by a groove inserted into the foot of the lower cover component, and the upper end of each hollow fin is closed by a groove inserted into the foot of the upper cover component (i.e., by the end of each hollow fin engaging with the foot), thus sealing the cooling medium inside the hollow fin.

[0007] However, in the case of the structure in Patent Document 1, in order to prevent the cooling medium inside the hollow heat sink from leaking out, it is necessary to seal the ends and feet of each hollow fin with water tightness (or air tightness), which presents a problem that requires precision machining of the ends and feet of each hollow fin.

[0008] In addition, since multiple feet are integrally formed on the lower and upper side cover components, inserting the grooves of each foot into the ends of each hollow fin is very troublesome and time-consuming. Summary of the Invention

[0009] The present invention was made in view of the above-mentioned problems, and its object is to provide a cooling fin structure that has good assembly workability and can reliably seal the ends of hollow fins, as well as a motor having such a cooling fin structure.

[0010] One embodiment of the cooling fin structure of the present invention is a cooling fin structure installed around the outer periphery of a motor and releasing heat from the motor. It is characterized by having: a plurality of heat sinks that project radially relative to the motor axis and extend parallel to the motor axis, each having a hollow portion containing refrigerant; a plurality of connecting portions disposed at the base ends of the heat sinks between them, connecting the heat sinks into a cylindrical shape; a plurality of cover portions disposed to cover the ends of each heat sink on both axial sides of the motor and sealing the hollow portion; and an adhesive tape disposed between each end and each cover portion, fixing each cover portion to each end.

[0011] In addition, one aspect of the motor of the present invention is characterized by having the above-described cooling fin structure.

[0012] The effects of this invention are as follows.

[0013] According to the present invention, a cooling fin structure that is easy to assemble and reliably seals the ends of hollow fins can be realized. Furthermore, a motor equipped with such a cooling fin structure can be realized. Attached Figure Description

[0014] Figure 1 This is a perspective view of a motor having the cooling fin structure according to the first embodiment of the present invention.

[0015] Figure 2 This is a diagram illustrating the structure of the cooling fin structure according to the first embodiment of the present invention.

[0016] Figure 3 This is an explanation Figure 2 A diagram of the structure of the cover body.

[0017] Figure 4 This is a diagram illustrating the structure of the cooling fin structure according to the second embodiment of the present invention.

[0018] Figure 5 This is a diagram illustrating the structure of the cooling fin structure according to the third embodiment of the present invention.

[0019] Figure 6 This is a diagram illustrating the structure of the cooling fin structure according to the fourth embodiment of the present invention.

[0020] Figure 7 It is shown Figure 6 A diagram showing an example of deformation of the cover body.

[0021] In the diagram: 1—Motor, 10—House, 20—Rotor, 30—Stator, 40—Cooling fin structure, 40A—Cooling fin structure, 40B—Cooling fin structure, 40C—Cooling fin structure, 50—Fin body, 50A—Fin body, 51—Heat sink, 51A—Heat sink, 52—Connecting part, 52A—Connecting part, 53A—Extension, 54A—Extension, 55A—Extension, 56A—Slit, 57A—Slit, 60—Cover, 60A—Cover, 60B—Cover, 60C— Cover body, 61C—cover body, 62—groove, 62C—protrusion, 64—wall, 64A—wall, 66—flat surface, 66A—flat surface, 70—adhesive tape, 72—adhesive tape, 80—plate, 81—frame, 82—tongue, 90—plate, 91—frame, 92—tongue, 100—frame component, 101—frame, 103—protrusion, 103a—through hole, 105—locking surface, 110—frame component, 111—frame, 113—protrusion, 130—connecting component, 131—screw, 132—nut. Detailed Implementation

[0022] The cooling fin structure of the present invention will now be described in detail with reference to the preferred embodiment shown in the accompanying drawings. For ease of explanation, the three mutually orthogonal axes will be designated as the X-axis, Y-axis, and Z-axis. As an example, the XY plane, including the X-axis and Y-axis, is horizontal, and the Z-axis is vertical. Furthermore, the cooling fin structure of the present invention will be... Figure 1 , Figure 2 and Figures 4-7 The upper side is called "upper (or above)" and the lower side is called "lower (or below)".

[0023] (First Implementation)

[0024] Figure 1 This is a perspective view of a motor having the cooling fin structure according to the first embodiment of the present invention. The motor 1 of this embodiment is, for example, a motor mounted on an unmanned aerial vehicle, such as... Figure 1 As shown, it includes a housing 10, a rotor 20, a stator 30, and a cooling fin structure 40.

[0025] The housing 10 is a cylindrical metal shell that houses the rotor 20 and the stator 30. Cooling fin structures 40 are provided on the outer peripheral surface of the housing 10. In this embodiment, the rotor 20, the stator 30, and the cooling fin structures 40 are arranged concentrically from the central axis J side of the motor 1, but the positional relationship between the rotor 20 and the stator 30 can be reversed.

[0026] The stator 30 has a conductive coil (not shown), which energizes the rotor 20 to rotate within the stator 30. The coil generates heat when energized, but the heat is dissipated by the cooling fin structure 40.

[0027] The cooling fin structure 40 includes: a cylindrical fin body 50 with a plurality of hollow heat sinks 51; a cover 60 provided to cover the axial ends of the motor 1 of each heat sink 51; and an adhesive tape 70. In this embodiment, the internal space (hollow portion) of each heat sink 51 is connected to the space where the stator 30 is disposed, and the space where the stator 30 is disposed is also connected to the space where the rotor 20 is disposed, and liquid refrigerant is filled in these continuous spaces. When power is supplied to the motor 1 and the rotor 20 rotates, the refrigerant circulates in the space. Therefore, the heat generated by the coils of the stator 30 is conducted to the heat sinks 51 via the refrigerant and dissipated from the surface of the heat sinks 51 to the outside air. In this way, the stator 30 can be cooled efficiently by the cooling fin structure 40.

[0028] Figure 2 This is a diagram illustrating the structure of the cooling fin structure 40. Figure 2 (a) is a partially enlarged perspective view of the cooling fin structure 40. Figure 2 (b) is a cross-sectional view of the cover portion 60 (i.e., the two ends of the heat sink 51 in the Z-axis direction). Additionally, Figure 3 This is a diagram illustrating the structure of the cover portion 60. Figure 3 (a) is a perspective view of the surface of the cover portion 60. Figure 3 (b) is a perspective view of the back of the cover portion 60.

[0029] The finned body 50 has: a plurality of heat sinks 51 that protrude radially relative to the central axis J of the motor 1 and extend parallel to the central axis J (Z-axis direction) of the motor; and a connecting portion 52 that connects the base end of each heat sink 51 to the base end of the adjacent heat sink 51. The finned body 50 is generally cylindrical in shape. Figure 1 In this embodiment, the plurality of heat sinks 51 and the plurality of connecting portions 52 can be formed, for example, by repeatedly folding a sheet of metal (such as aluminum) with excellent thermal conductivity. Furthermore, the cross-section of each heat sink 51 in the XY plane is approximately rectangular, and the interior of each heat sink 51 is hollow. Additionally, each heat sink 51 has openings at both ends in the Z-axis direction.

[0030] The cover portion 60 is a rectangular metal (aluminum, etc.) component mounted such that it covers both ends of each heat sink 51 in the Z-axis direction. For example... Figure 3As shown, the cover portion 60 has a U-shaped groove 62 formed along the inner side of the cover portion 60. When the cover portion 60 is installed on each heat sink 51, the end of each heat sink 51 is embedded (received) in the groove 62, and the end of each heat sink 51 is covered by the wall portion 64 and the planar portion 66 on the outer side of the groove 62, thus sealing the hollow portion of each heat sink 51. In addition, the cover portion 60 of this embodiment can be manufactured by stamping or the like.

[0031] The adhesive tape 70 is a double-sided adhesive tape used to fix the cover portion 60 to both ends of each heat sink 51 in the Z-axis direction. In this embodiment, the adhesive tape 70 is attached along both ends of the outer peripheral surface of the heat sink 51 and the connecting portion 52 in the Z-axis direction. Furthermore, when the cover portion 60 is installed on each heat sink 51, the adhesive tape 70 is sandwiched between the wall portion 64 of the cover portion 60 and the outer peripheral surface of the heat sink 51, thus fixing the cover portion 60 to each heat sink 51. Figure 2 (b)). In addition, as the adhesive tape 70, it is preferable to be an adhesive tape that is cured by heating, for example, an adhesive film that can be laminated with a temporary fixing adhesive sheet and a heat-curing adhesive.

[0032] Thus, in this embodiment, since the adhesive tape 70 is provided on the outer peripheral surface of the heat sink 51 and is configured to be embedded in the groove 62 of the cover portion 60, the area in which the refrigerant and its vapor in the hollow portion of each heat sink 51 directly contact the adhesive tape 70 is minimized. Therefore, deformation caused by pressure changes in the hollow portion of the heat sink 51 and swelling of the adhesive tape 70 can be suppressed.

[0033] Thus, the cover portion 60 of the cooling fin structure 40 of this embodiment is respectively installed at both ends of each heat sink 51 in the Z-axis direction by adhesive tape 70. Therefore, the cooling fin structure 40 of this embodiment is easy to assemble, and the hollow portion of each heat sink 51 is reliably sealed.

[0034] The above is a description of the embodiments of the present invention, but the present invention is not limited to the structure of the above embodiments, and various modifications can be made within the scope of its technical concept.

[0035] (Second Implementation)

[0036] Figure 4 This is a diagram showing the structure of the cooling fin structure 40A according to the second embodiment of the present invention. Figure 4 (a) is a perspective view of the cooling fin structure 40A. Figure 4 (b) is a partially enlarged perspective view of the cooling fin structure 40A. Figure 4 (c) is a cross-sectional view of the cover portion 60A (i.e., the two ends of the heat sink 51 in the Z-axis direction).

[0037] like Figure 4 As shown, the cooling fin structure 40A of this embodiment differs from the cooling fin structure 40 of the first embodiment in that it has annular plates 80 and 90 (first plate and second plate) at both ends of the fin body 50 in the Z-axis direction, and the groove 62 is not formed on the cover portion 60A. Furthermore, since plates 80 and 90 have the same structure, plate 80 will be described primarily below.

[0038] like Figure 4 (a) Figure 4 As shown in (b), the plate 80 is a metal plate-shaped component having an annular frame 81 and a plurality of rectangular tongue portions 82 (first tongue portions) that radiate out from the frame 81. Each tongue portion 82 is configured to block the opening at its Z-axis end in the Z-axis direction + side of each heat sink 51 (i.e., configured to face the cover portion 60A), and the annular frame 81 is fixed inside the housing 10 of the motor 1.

[0039] In addition, like plate 80, plate 90 is a metal plate-shaped component with an annular frame 91 (not shown) and a plurality of rectangular tongue portions 92 (second tongue portions (not shown)) radiating from the frame 91. Each tongue portion 92 is arranged at the end of each heat sink 51 in the Z-axis direction. The annular frame 91 is fixed inside the housing 10 of motor 1.

[0040] The cover portion 60A is similar to the cover portion 60 in the first embodiment, and is a rectangular metal (aluminum, etc.) component that is mounted to cover both ends of each heat sink 51 in the Z-axis direction. When the cover portion 60A is mounted on each heat sink 51, the ends and tongue portions 82 and 92 of each heat sink 51 are covered by the wall portion 64A and the flat portion 66A, and the hollow portion of each heat sink 51 is sealed.

[0041] The adhesive tape 70 is a double-sided adhesive tape used to fix the cover portion 60A to both ends of each heat sink 51 in the Z-axis direction. In this embodiment, the adhesive tape 70 is adhered along the inner surface of the cover portion 60A. Furthermore, when the cover portion 60A is installed on each heat sink 51, the adhesive tape 70 is sandwiched between the wall portion 64 of the cover portion 60A and the outer peripheral surface of the heat sink 51, and between the flat portion 66A of the cover portion 60A and the tongue portions 82 and 92, thus fixing the cover portion 60A to each heat sink 51. Figure 4 (c)).

[0042] Thus, in this embodiment, the adhesive tape 70 is disposed along the inner surface of the cover portion 60A, which is installed to cover the ends of each heat sink 51 and the tongue portions 82 and 92. Therefore, the area of ​​direct contact between the refrigerant and its vapor within the hollow portion of each heat sink 51 and the adhesive tape 70 is minimized. Therefore, similar to the first embodiment, deformation caused by pressure changes within the hollow portion of the heat sink 51 and swelling of the adhesive tape 70 can be suppressed.

[0043] (Third Implementation)

[0044] Figure 5 This is a diagram showing the structure of the cooling fin structure 40B according to the third embodiment of the present invention. Figure 5 (a) is a perspective view of the cooling fin structure 40B. Figure 5 (b) is a partially enlarged perspective view of the cooling fin structure 40B. Figure 5 (c) is a sectional view of the connecting part 130.

[0045] like Figure 5 As shown, the cooling fin structure 40B of this embodiment differs from the cooling fin structure 40A of the second embodiment in that annular frame members 100 and 110 (first frame and second frame) are provided at both ends of the fin body 50 in the Z-axis direction, replacing the plates 80 and 90. The frame members 100 and 110 are connected by a connecting member 130, and an adhesive tape 72 is provided to cover the base end of the heat sink 51. Furthermore, since the frame members 100 and 110 have the same structure, the frame member 100 will be described primarily below.

[0046] like Figure 5 (a) Figure 5 As shown in (b), the frame member 100 is a metal plate-shaped member having an annular frame 101 and a plurality of protrusions 103 (first protrusions) that radiate out from the frame 101. Each protrusion 103 is arranged on the cover portion 60A (Z-axis direction + side) between the heat sinks 51. The annular frame 101 is fixed inside the housing 10 of the motor 1.

[0047] In addition, the frame component 110, like the frame component 100, is a metal plate-shaped component having an annular frame 111 (not shown) and a plurality of protrusions 113 (second protrusions (not shown)) radiating from the frame 111. It is arranged on the cover portion 60A (Z-axis direction - side) with each protrusion 113 located between the heat sink 51. The annular frame 111 is fixed inside the housing 10 of the motor 1.

[0048] like Figure 5 (b) Figure 5 As shown in (c), the frame 101 has an L-shaped engagement surface 105 that engages with the corners of the base ends of the plurality of heat sinks 51. Furthermore, when the frame member 100 is mounted on the cover portion 60A, with the plurality of protrusions 103 located between the heat sinks 51, the engagement surface 105 is configured to engage with the corners of the base ends of the plurality of heat sinks 51. Also, when the frame member 100 is mounted on the cover portion 60A, the through hole 103a formed on the protrusion 103 and extending along the Z-axis is located further outward than each connecting portion 52 of the fin body portion 50.

[0049] The adhesive tape 72 is a double-sided adhesive tape used to fix the frame component 100 to the cover portion 60A. In this embodiment, the adhesive tape 72 is attached along the engaging surface 105 of the frame 101. When the frame component 100 is installed on the cover portion 60A, the adhesive tape 72 is sandwiched between the corner of the base end side of the heat sink 51 and the engaging surface 105, and the frame component 100 is fixed to the cover portion 60A. Figure 5 (b)).

[0050] The connecting member 130 is a component that connects the frame members 100 and 110 in the Z-axis direction. It consists of screws 131 extending in the Z-axis direction along each connecting portion 52 of the fin body portion 50 and nuts 132 threadedly engaged with the front end of the screws 131. By passing the screws 131 through the through holes 103a (first through hole) and 113a (second through hole (not shown)) of the protrusions 103 and 113 (not shown) of the frame members 100 and 110, and installing the nuts 132 at the front end of the screws 131, the protrusions 103 and 113 that are opposite each other in the Z-axis direction are connected. Furthermore, by tightening each screw 131, the frame members 100 and 110 can be forceped relative to the cover portion 60A (i.e., relative to the fin body portion 50), thereby reliably fixing the two together. In addition, regarding the connecting part 130, it can be removed after the cover part 60A and the frame part 100 are fixed with adhesive tapes 70 and 72.

[0051] Thus, in this embodiment, the adhesive tape 72 is provided along the corner of the base end side of the heat sink 51, and the frame members 100 and 110 are installed to cover the corner of the base end side of the heat sink 51. Therefore, the area in direct contact between the refrigerant and its vapor in the hollow portion of each heat sink 51 and the adhesive tape 70 is minimized. Therefore, similar to the first embodiment, deformation caused by pressure changes in the hollow portion of the heat sink 51 and swelling of the adhesive tape 70 can be suppressed.

[0052] In addition, since the frame components 100 and 110 are firmly fixed by applying force to the cover portion 60A in the Z-axis direction on the + and - sides, it is possible to reliably prevent the refrigerant and its vapor from leaking out from the gap between the cover portion 60A and the fin body portion 50.

[0053] (Fourth Implementation)

[0054] Figure 6 This is a diagram showing the structure of the cooling fin structure 40C according to the fourth embodiment of the present invention. Figure 6 (a) is a partial perspective view illustrating the assembly method of the fin body 50A of the cooling fin structure 40C. Figure 6 (b) is a partially enlarged view illustrating how the cover portion 60B is mounted on the fin body portion 50A. Additionally, in Figure 6 In (a), three heat sinks 51A are shown, but in fact, like the finned body 50 of the first to third embodiments, the multiple heat sinks 51A are configured to be connected into a cylindrical shape.

[0055] like Figure 6 As shown in (a), the difference between the fin body portion 50A of this embodiment and the fin body portion 50 of the first embodiment is that extension portions 53A to 55A that are longer than the connecting portion 52A in the Z-axis direction are formed at both ends of the heat sink 51A.

[0056] Extensions 53A and 54A are portions that protrude from the protruding direction of the heat sink 51A (i.e., the radial direction of the fin body 50) towards the + and - sides in the Z-axis direction. Extension 55A is a portion that protrudes from the front end of the heat sink 51A towards the + and - sides in the Z-axis direction. Extensions 53A to 55A are completely independent by a slit 56A formed between extensions 53A and 55A and a slit 57A formed between extensions 54A and 55A. A V-shaped cut is formed at the boundary between the extensions 53A to 55A and the heat sink 51A. Furthermore, by bending the extensions 53A to 55A inward along the V-shaped cut, the ends (openings) of each heat sink 51A are covered by the extensions 53A to 55A, and the hollow portion of each heat sink 51A is sealed. Figure 6 (b) The two heat sinks 51A on the right side show a state where the extensions 53A to 55A are bent to seal the ends (openings) of each heat sink 51A. Additionally, in Figure 6In heat sink 51A (b), extension portion 55A is riveted together using a special tool after sequentially bending extension portions 53A, 54A, and 55A. Furthermore, in this embodiment, cover portion 60B is installed to cover the front end of heat sink 51A (i.e., the periphery of extension portion 55A). Also, similar to cover portion 60A in the second embodiment, adhesive tape 70 is attached to the inner surface of cover portion 60B in this embodiment, and cover portion 60B is fixed to the front end of heat sink 51A via adhesive tape 70.

[0057] Thus, in this embodiment, the cover portion 60B is installed via the adhesive tape 70, based on the extension portions 53A to 55A covering the ends (openings) of each heat sink 51 (i.e., based on the inner cover (inner cover portion) formed by the extension portions 53A to 55A). Therefore, the area of ​​direct contact between the refrigerant and its vapor within the hollow portion of each heat sink 51A and the adhesive tape 70 is minimized. Therefore, similar to the first to third embodiments, deformation caused by pressure changes within the hollow portion of the heat sink 51A and swelling of the adhesive tape 70 can be suppressed.

[0058] In addition, since the cover portion 60B is installed in a manner that covers the front end of the heat sink 51A (i.e., the periphery of the extension portion 55A), it is possible to reliably prevent the refrigerant and its vapor from leaking out from the gap at the front end of the heat sink 51A.

[0059] (A modified example of the cover part 60B)

[0060] Figure 7 This is a diagram showing a modified example of the cover portion 60B according to the fourth embodiment of the present invention. The difference between the cover portion 60C in this modified example and the cover portion 60B of the fourth embodiment is that it has a cover body 61C covering both ends of each heat sink 51A in the Z-axis direction and a protrusion 62C protruding from the cover body 61C in such a way as to cover the base end of each heat sink 51A.

[0061] In this way, since the base end of each heat sink 51A is covered by the protrusion 62C, it is possible to prevent the refrigerant and its vapor from leaking out from the gap at the base end of each heat sink 51A.

[0062] Furthermore, the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the invention is not shown by the foregoing description, but by the scope of the technical solutions, and is intended to include all modifications within the scope equivalent to the technical solutions.

Claims

1. A cooling fin structure mounted to surround the outer periphery of a motor and dissipating heat from the motor, characterized in that the cooling fin structure has: Multiple heat sinks that project radially relative to the axis of the motor and extend parallel to the axis of the motor, and have a hollow portion inside which refrigerant is sealed. Multiple connecting parts are disposed at the base ends of the multiple heat sinks between the heat sinks, connecting the multiple heat sinks into a cylindrical shape; Multiple cover portions are provided such that they respectively cover the ends of the motor on both sides of each of the heat sinks, and seal the hollow portion; An adhesive tape is disposed between each of the said ends and each of the said cover portions to fix each of the said cover portions to each of the said ends; A third ring-shaped frame is configured at one end of each of the heat sinks in such a way as to press against the base end of the plurality of cover portions; as well as A fourth ring-shaped frame is configured at the other end of each of the heat sinks to press against the base end of the plurality of cover portions. The third frame has a plurality of first protrusions that project radially relative to the shaft of the motor at positions corresponding to the connecting portion. The fourth frame has a plurality of second protrusions that project in a manner opposite to the plurality of first protrusions in the axial direction of the motor. The cooling fin structure also has a plurality of connecting components that connect each of the first protrusions and each of the second protrusions along the axial direction of the motor.

2. The cooling fin structure according to claim 1, characterized in that, The third frame and the fourth frame each have a locking surface that engages with the corner of the base end side of the plurality of heat sinks, and are in the shape of an L-shape in cross section.

3. The cooling fin structure according to claim 2, characterized in that, An adhesive tape is also provided between the corners of the base ends of the plurality of heat sinks and the engaging surfaces of the third frame and the fourth frame.

4. The cooling fin structure according to any one of claims 1 to 3, characterized in that, The first protrusion has a first through hole extending along the axial direction of the motor. The second protrusion has a second through hole extending along the axial direction of the motor. Each of the connecting components has a screw passing through the first through hole and the second through hole, and a nut threadedly engaged with the screw.

5. The cooling fin structure according to any one of claims 1 to 3, characterized in that, The axial cross-section of the motor in each of the heat sinks is rectangular.

6. The cooling fin structure according to claim 1, characterized in that, Each of the heat sinks and each of the connecting portions are integrally formed by bending a single metal plate.

7. The cooling fin structure according to claim 6, characterized in that, Each of the heat sinks has an inner cover formed by bending the metal plate at each end.

8. The cooling fin structure according to claim 6, characterized in that, The adhesive tape is cured by heating.

9. A motor, characterized in that, It has the cooling fin structure as described in claim 1.

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