Heat dissipation member, electrical apparatus provided with same, and motor device
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Filing Date
- 2026-02-18
- Publication Date
- 2026-06-05
Abstract
Description
Heat dissipation member, and electrical equipment and motor device equipped with the same
[0001] The present disclosure relates to a heat dissipation member, and an electric device and a motor device including the same. More particularly, the present disclosure relates to a heat dissipation member including a plurality of heat dissipation fins, and an electric device and a motor device including the same.
[0002] Patent Document 1 discloses a heat sink including a flat base having a heat-receiving surface that receives heat from a power semiconductor, and a heat dissipation section having a plurality of fins formed on the base. Each of the fins is V-shaped and is arranged on the surface of the base so that a V-shaped groove is formed between two adjacent fins.
[0003] JP 2014-22680 A
[0004] An object of the present disclosure is to provide a heat dissipation member that can improve heat dissipation performance, and an electric device and a motor device that include the same.
[0005] A heat dissipation member according to one aspect of the present disclosure includes a base material and a plurality of heat dissipation fins provided on a surface of the base material. An air passage is provided on the surface of the base material between a first region and a second region along a vertical direction. The plurality of heat dissipation fins include a plurality of first fins provided in the first region and a plurality of second fins provided in the second region. The plurality of first fins are formed in a plate shape extending along a first direction, and the plurality of second fins are formed in a plate shape extending along a second direction. When viewed from a normal direction to the surface, the first direction and the second direction are each obliquely inclined with respect to the vertical direction.
[0006] An electrical device according to an aspect of the present disclosure includes a housing that houses an electric circuit, and the heat dissipation member, wherein the base material of the heat dissipation member is attached to the housing.
[0007] A motor device according to one aspect of the present disclosure includes a motor having a first housing, a second housing, and the heat dissipation member. The first housing houses a rotor and a stator. The second housing houses a drive circuit that drives the motor and is attached to the first housing. The base material of the heat dissipation member is attached to the second housing.
[0008] FIG. 1 is a Y-Z cross-sectional view of a heat dissipation member according to an embodiment of the present disclosure. FIG. 2 is a cross-sectional view of an electric device to which the heat dissipation member of the same embodiment is attached. FIG. 3 is a perspective view of the heat dissipation member of the same embodiment. FIG. 4 is a plan view of a heat dissipation member of a comparative example. FIG. 5 is a cross-sectional view of a motor device to which the heat dissipation member of the same embodiment is attached. FIG. 6 is a cross-sectional view of an electric device according to Modification 1. FIG. 7 is a Y-Z cross-sectional view of a heat dissipation member of Modification 2. FIG. 8 is a Y-Z cross-sectional view of a heat dissipation member of Modification 3. FIG. 9 is a Y-Z cross-sectional view of a heat dissipation member of Modification 3. FIG. 10 is a Y-Z cross-sectional view of a heat dissipation member of Modification 4. FIG. 11 is a Y-Z cross-sectional view of a heat dissipation member of Modification 4. FIG. 12 is a Y-Z cross-sectional view of a heat dissipation member of Modification 5. FIG. 13 is a Y-Z cross-sectional view of a heat dissipation member of Modification 5. FIG. 14 is a side view of a heat dissipation member of Modification 6. FIG. 15 is a partial cross-sectional view of a motor device according to Modification 7.
[0009] Hereinafter, a heat dissipation member according to an embodiment, and an electric device and a motor device including the same will be described in detail with reference to the drawings. However, each diagram described in the following embodiments is a schematic diagram, and the dimensional ratios of the sizes of the components do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.
[0010] (Embodiment) (1) Overview A heat dissipation member 40 according to this embodiment includes a base material 41 and a plurality of heat dissipation fins 42A provided on a surface 41A of the base material 41, as shown in FIGS.
[0011] A ventilation passage 43 is provided on the surface 41A of the base material 41 between the first region R1 and the second region R2 along the vertical direction.
[0012] The plurality of heat dissipation fins 42A include a plurality of first fins 421 provided in the first region R1 and a plurality of second fins 422 provided in the second region R2.
[0013] The first fins 421 are formed in a plate shape extending along the first direction DR1, and the second fins 422 are formed in a plate shape extending along the second direction DR2.
[0014] When viewed from the normal direction of the surface 41A, each of the first direction DR1 and the second direction DR2 is inclined obliquely with respect to the up-down direction.
[0015] The heat dissipation member 40 is attached to the housing 30 of the electric device 3 as shown in FIG. 2 , for example, and is used to dissipate heat from heat-generating components housed in the housing 30 .
[0016] In this embodiment, as shown in FIG. 2 , the X-axis direction, which is the arrangement direction of the heat dissipation member 40 and the housing 30 of the electrical device 3, is defined as the front-to-rear direction, the Y-axis direction (see FIGS. 1 and 3 ) as the left-to-right direction, and the Z-axis direction as the up-to-down direction. Furthermore, the positive direction of the X-axis direction is defined as the front side, the positive direction of the Y-axis direction as the right side, and the positive direction of the Z-axis direction as the top side. That is, the surface of the base material 41 attached to the housing 30 is the rear side, and the surface on which the heat dissipation fins 42A are provided is the front side. The normal direction of the base material 41 is along the X-axis direction, which in this embodiment is along the front-to-rear direction. Furthermore, in FIGS. 1 and 3 , a first direction DR1, which is the longitudinal direction of the first fin 421, and a second direction DR2, which is the longitudinal direction of the second fin 422, are indicated by arrows. Note that these directions are merely examples and are not intended to limit the orientation of the heat dissipation member 40 during use. Furthermore, the arrows indicating the respective directions in the drawings are merely shown for explanatory purposes and do not represent actual objects.
[0017] On the front surface 41A of the base material 41, the heat dissipation fins 42A are not provided in the region between the first region R1 and the second region R2, and the region where the heat dissipation fins 42A are not provided becomes the ventilation passage 43.
[0018] A plurality of first fins 421 each formed in a plate shape are arranged on the right side of the ventilation passage 43 on the surface 41A of the base material 41, and a plurality of second fins 422 each formed in a plate shape are arranged on the left side of the ventilation passage 43. The plurality of first fins 421 extend along a first direction DR1 that is obliquely inclined with respect to the up-down direction (Z-axis direction), and a flow path 431 extending along the first direction DR1 is formed between two adjacent first fins 421. The plurality of second fins 422 extend along a second direction DR2 that is obliquely inclined with respect to the up-down direction (Z-axis direction), and a flow path 432 extending along the second direction DR2 is formed between two adjacent second fins 422.
[0019] Fig. 4 is a plan view of a heat dissipation member 40C of the comparative example. In the heat dissipation member 40C of the comparative example, a plurality of heat dissipation fins 42 are arranged in a row in the left-right direction on the surface 41A of a base material 41. Each of the plurality of heat dissipation fins 42 extends in the up-down direction, and a flow path 44 through which air passes is provided between two adjacent heat dissipation fins 42. Note that the dotted arrows in Fig. 4 indicate the air flow.
[0020] When the base material 41 of the heat dissipation member 40C is attached to the housing 30 of the electrical device 3, air heated by the heat-generating components moves upward inside the housing 30, causing the temperature of the upper region B1 on the surface 41A of the base material 41 to be higher than the temperature of the lower region. In the comparative example, when air that flows into the flow path 44 from below the heat dissipation member 40C rises within the flow path 44, thermal interference occurs between the air and the warm air present in the upper part of the flow path 44, which can impair the air flow and reduce the heat dissipation performance of the heat dissipation member 40C.
[0021] In contrast, in the heat dissipation member 40 of this embodiment, the multiple first fins 421 and the multiple second fins 422 are inclined obliquely with respect to the vertical direction. Therefore, the flow paths 431 between the multiple first fins 421 and the flow paths 432 between the multiple second fins 422 are each inclined obliquely with respect to the vertical direction. As a result, the air flowing through the flow paths 431 and 432 moves while avoiding the upper center of the surface 41A of the base material 41, thereby preventing the air flow from being obstructed by thermal interference. Therefore, by smoothing the movement of air through the flow paths 431 and 432, there is an advantage in that the heat dissipation performance of the heat dissipation member 40 can be improved.
[0022] (2) Details The heat dissipation member 40 according to the embodiment and the electrical device 3 to which the heat dissipation member 40 is attached will be described in more detail below with reference to FIGS. 1 to 5. FIG.
[0023] FIG. 2 is a cross-sectional view taken along the line ZX of the electrical device 3 to which the heat dissipation member 40 is attached.
[0024] The electric device 3 includes a housing 30 that houses an electric circuit 50 and a heat dissipation member 40 , and a base material 41 of the heat dissipation member 40 is attached to the housing 30 .
[0025] The housing 30 is made of, for example, a metal material or a synthetic resin material and is formed in a box shape with an opening on the front side. A heat dissipation member 40 is attached to the housing 30.
[0026] The heat dissipation member 40 is made of a metal material such as aluminum having good thermal conductivity, or a ceramic material, and includes a flat base member 41 and a plurality of heat dissipation fins 42A provided on one surface of the base member 41.
[0027] The base material 41 is attached to the housing 30 using bolts or the like so as to close the front opening of the housing 30. When the heat dissipation member 40 is attached to the housing 30, the surface 41A of the base material 41 becomes the front surface 30A of the housing 30.
[0028] The plurality of heat dissipation fins 42A are provided integrally with the base material 41 on the surface 41A of the base material 41 (i.e., the front surface 30A of the housing 30). As described above, the surface 41A of the base material 41 has the ventilation passages 43 formed along the vertical direction. The heat dissipation fins 42A are not provided in the center of the surface 41A of the base material 41 in the horizontal direction, and the region where the heat dissipation fins 42A are not provided becomes the ventilation passages 43.
[0029] A plurality of heat dissipation fins 42A are provided on the front surface 41A of the base material 41 on both the left and right sides of the ventilation passage 43. In other words, the plurality of heat dissipation fins 42A include a plurality of first fins 421 provided on the front surface 41A in a first region R1 on the right side of the ventilation passage 43 and a plurality of second fins 422 provided on the front surface 41A in a second region R2 on the left side of the ventilation passage 43.
[0030] The first fins 421 are formed in the shape of plates extending along the first direction DR1. The angle θ1 between the first direction DR1, which is parallel to the longitudinal direction of the first fins 421, and the up-down direction (Z-axis direction) is preferably, for example, 40 degrees or more and 70 degrees or less. The first fins 421 are arranged on the surface 41A of the base material 41 so as to be aligned at regular intervals in directions perpendicular to the first direction DR1 and the normal direction (X-axis direction) of the surface 41A.
[0031] The second fins 422 are formed in the shape of plates extending along the second direction DR2. The angle θ2 between the second direction DR2, which is parallel to the longitudinal direction of the second fins 422, and the up-down direction (Z-axis direction) is preferably, for example, 40 degrees or more and 70 degrees or less. The second fins 422 are arranged on the surface 41A of the base material 41 so as to be aligned at regular intervals in directions perpendicular to the second direction DR2 and the normal direction (X-axis direction) of the surface 41A.
[0032] An electric circuit 50 is housed in an accommodation space surrounded by the housing 30 and the base material 41 of the heat dissipation member 40. The electric circuit 50 is, for example, a drive circuit that drives a motor. The electric circuit 50 has, for example, a circuit board 51 on which circuit components such as a plurality of switching elements 52 that constitute an inverter circuit and a driver IC 53 that controls the plurality of switching elements 52 are mounted. The circuit board 51 is a double-sided board. For example, the plurality of switching elements 52 are mounted on the front mounting surface of the circuit board 51, and the plurality of driver ICs 53 are mounted on the rear mounting surface of the circuit board 51.
[0033] The circuit board 51 is fixed to the base material 41 of the heat dissipation member 40 via a plurality of metal spacers 54. A heat dissipation plate 61 made of, for example, a metal material or a ceramic material is fixed to the rear surface of the base material 41. In addition, a heat dissipation sheet 62 made of insulating synthetic resin is interposed between the heat dissipation plate 61 and the switching elements 52 mounted on the front mounting surface of the circuit board 51. Therefore, heat from the switching elements 52 is conducted to the base material 41 of the heat dissipation member 40 via the heat dissipation sheet 62 and the heat dissipation plate 61, and is dissipated from the base material 41 and the plurality of heat dissipation fins 42A, etc.
[0034] A heat sink 63 made of, for example, a metal or ceramic material is disposed between the circuit board 51 and the rear wall of the housing 30. The heat sink 63 does not contact the rear wall of the housing 30. A plurality of metal spacers 55 are disposed between the circuit board 51 and the heat sink 63, and the heat sink 63 is fixed to the base material 41 of the heat sink member 40 via a plurality of metal spacers 55 and 54. A heat sink sheet 64 made of insulating synthetic resin is disposed between the driver IC 53 mounted on the rear mounting surface of the circuit board 51 and the heat sink 63. Heat from the driver IC 53 is conducted to the heat sink 63 via the heat sink sheet 64, and further conducted to the base material 41 of the heat sink member 40 via the metal spacers 55 and 54, and is dissipated from the base material 41 and the plurality of heat sink fins 42A, etc.
[0035] As described above, on the surface 41A of the base material 41 of the heat dissipation member 40, a plurality of first fins 421 each formed in a plate shape are arranged on the right side of the ventilation passage 43, and a plurality of second fins 422 each formed in a plate shape are arranged on the left side of the ventilation passage 43.
[0036] Here, each of the plurality of first fins 421 and the plurality of second fins 422 is formed in a shape that, the further upward, the farther it is from the ventilation passage 43. In other words, each of the plurality of first fins 421 and the plurality of second fins 422 is inclined obliquely so that first ends 4211, 4221 on the side closer to the ventilation passage 43 are positioned lower than second ends 4212, 4222 on the opposite side.
[0037] The first fins 421 and the second fins 422 are symmetrical with respect to the ventilation passage 43 .
[0038] As a result, air rising in ventilation passage 43 flows from ventilation passage 43 to flow passage 431 between the plurality of first fins 421 or flow passage 432 between the plurality of second fins 422, and moves upward through flow passage 431 or 432. Here, since the plurality of first fins 421 and the plurality of second fins 422 are formed symmetrically with respect to ventilation passage 43, air can flow evenly from ventilation passage 43 to flow passages 431 and 432. Then, as the air flows through flow passages 431 and 432, heat exchange occurs between the air passing through flow passage 431 and the first fins 421, and between the air passing through flow passage 432 and the second fins 422, respectively, thereby reducing the temperature rise of electric circuit 50.
[0039] Furthermore, each of the plurality of first fins 421 and the plurality of second fins 422 is inclined obliquely so that the first ends 4211, 4221 closest to the ventilation passage 43 are positioned lower than the opposite second ends 4212, 4222, allowing air to move outward through the flow paths 431, 432. As a result, the air flowing from the ventilation passage 43 into the flow paths 431, 432 moves while avoiding the upper center of the surface 41A of the base material 41, thereby preventing the air flow from being obstructed by thermal interference. Therefore, by smoothing the movement of air within the flow paths 431, 432, the heat dissipation performance of the heat dissipation member 40 can be improved, which has the advantage of suppressing the temperature rise of the electric circuit 50.
[0040] The heat dissipation member 40 of this embodiment is attached to the housing 30 of the electric device 3. In other words, the electric device 3 includes the housing 30 that houses the electric circuit 50 and the heat dissipation member 40, and the base material 41 of the heat dissipation member 40 is attached to the housing 30.
[0041] The base material 41 of the heat dissipation member 40 is attached to the housing 30 of the electrical device 3, so that the heat generated in the electrical circuit 50 can be dissipated by the heat dissipation member 40, thereby suppressing the temperature rise of the electrical circuit 50.
[0042] The electric device 3 to which the heat dissipation member 40 of this embodiment is attached is, for example, a control unit of a motor, but the electric device 3 serving as a control unit may be integrated with the motor 2 as shown in FIG.
[0043] FIG. 5 is a cross-sectional view of a mechanically and electrically integrated motor device 1 in which a motor 2 and an electric device 3, which is a control unit for controlling the motor 2, are integrated.
[0044] 5, the motor 2 includes a first housing 20 to which the housing 30 of the electric device 3 is attached. In order to distinguish it from the first housing 20 of the motor 2, the housing 30 of the electric device 3 may hereinafter be referred to as a second housing 30.
[0045] The first housing 20 includes a cylindrical member 200 and cover members 201 and 202 .
[0046] The cylindrical member 200 is made of, for example, a metal material or a synthetic resin material, and is formed in a rectangular cylindrical shape with both ends in the front-rear direction being open.
[0047] The cover member 201 is formed in a flat plate shape from, for example, a metal material or a synthetic resin material. The cover member 201 is attached to the cylindrical member 200 with bolts or the like so as to close the opening on the front side (the side closer to the electrical device 3) of the cylindrical member 200.
[0048] The cover member 202 is formed in a flat plate shape from, for example, a metal material or a synthetic resin material. The cover member 202 is attached to the cylindrical member 200 with bolts or the like so as to close the opening on the rear side of the cylindrical member 200. The cover member 202 has a through hole through which the shaft 24 of the motor 2 is inserted.
[0049] A stator 21 and a rotor 23 are housed inside the first housing 20. A coil 22 is provided on the stator 21. The rotor 23 is integral with a shaft 24, and the shaft 24 is rotatably supported on the first housing 20 via bearings 25 and 26. The front end portion of the shaft 24 is inserted into a through-hole provided in the cover member 202 and is exposed to the outside of the first housing 20. The bearing 26 is fixed to the cylindrical member 200 or the cover member 201 via an appropriate member. The bearing 25 is fixed to the cover member 202, for example, but may also be fixed to the cylindrical member 200 via an appropriate member.
[0050] In the electric device 3 shown in FIG. 5 , the second housing 30 of the electric device 3 is composed of a cylindrical member 31 and a bottom plate 32 .
[0051] The cylindrical member 31 is made of, for example, a metal material or a synthetic resin material and is formed in a rectangular cylindrical shape with both ends in the front-rear direction being open.
[0052] The bottom plate 32 is formed in a flat plate shape from, for example, a metal material or a synthetic resin material. The bottom plate 32 is attached to the cylindrical member 31 using bolts or the like so as to close the rear opening of the cylindrical member 31. The bottom plate 32 is attached to the cover member 201 of the first housing 20 using bolts or the like.
[0053] Furthermore, the base material 41 of the heat dissipation member 40 is attached to the cylindrical member 31 with bolts or the like so as to close the front opening of the cylindrical member 31. A plurality of heat dissipation fins 42A of the heat dissipation member 40 protrude forward from a surface 41A of the base material 41, which forms the front surface 30A of the housing 30.
[0054] As described above, the motor device 1 includes the motor 2 having the first housing 20, the second housing 30 attached to the first housing 20, and the heat dissipation member 40. The first housing 20 houses the rotor 23 and the stator 21. The second housing 30 houses a drive circuit (electrical circuit 50) that drives the motor 2. The base material 41 of the heat dissipation member 40 is attached to the second housing 30.
[0055] The base material 41 of the heat dissipation member 40 is attached to the second housing 30 of the electromechanical integrated motor device 1. Therefore, the heat generated in the electric circuit 50 that serves as the drive circuit can be dissipated by the heat dissipation member 40, and the temperature rise of the drive circuit can be suppressed.
[0056] (3) Modifications The above embodiment is merely one of various embodiments of the present disclosure. The above embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved.
[0057] Modifications of the above embodiment are listed below. The modifications described below can be applied in appropriate combinations. Note that, hereinafter, the above embodiment may also be referred to as the basic configuration.
[0058] (3.1) Modification 1 An electric device 3 including a heat dissipation member 40 according to modification 1 will be described with reference to FIG.
[0059] The heat dissipation member 40 according to the first modification is different from the basic configuration in that it includes a cover member 70 disposed opposite the surface 41A of the base material 41, and the tips of the plurality of heat dissipation fins 42A are in contact with the cover member 70. Note that components common to the basic configuration are denoted by the same reference numerals, and illustrations and descriptions thereof will be omitted.
[0060] The cover member 70 is formed in a flat plate shape from, for example, a synthetic resin material. The shape and size of the cover member 70 in a plan view are the same as the shape and size of the base material 41 of the heat dissipation member 40 in a plan view.
[0061] The cover member 70 is attached to the heat dissipation member 40 with the tips of the multiple heat dissipation fins 42A in contact with the rear surface of the cover member 70. Therefore, the flow path 431 is a space surrounded by two adjacent first fins 421, the base material 41, and the cover member 70, and the flow path 432 is a space surrounded by two adjacent second fins 422, the base material 41, and the cover member 70. Because the flow paths 431 and 432 are each closed spaces, a chimney effect allows cold air from the outside to easily enter the flow paths 431 and 432, improving the efficiency of heat exchange in the first fins 421 and the second fins 422 and reducing the temperature rise of the electric circuit 50 housed in the housing 30.
[0062] The cover member 70 is not limited to being made of synthetic resin material, but may be made of metal material, ceramic material, or the like.
[0063] (3.2) Modification 2 A heat dissipation member 40 according to modification 2 will be described with reference to FIG.
[0064] The shapes of the first fins 421 and the second fins 422 described in the basic configuration are merely examples and can be changed as appropriate.
[0065] 7, the heat dissipation member 40 according to the second modification differs from the basic configuration in that each of the plurality of first fins 421 and the plurality of second fins 422 is inclined obliquely so that the first ends 4211, 4221 closer to the ventilation passage 43 are positioned higher than the opposite second ends 4212, 4222. Note that components common to the basic configuration are denoted by the same reference numerals, and illustrations and descriptions thereof will be omitted.
[0066] Each of the plurality of first fins 421 and the plurality of second fins 422 is inclined obliquely with respect to the up-down direction so as to be closer to the ventilation passage 43 as it goes upward.
[0067] In this case, air that flows from outside the heat dissipation member 40 into the flow paths 431 between the multiple first fins 421 or the flow paths 432 between the multiple second fins 422 moves upward and inward within the flow paths 431 or 432, and then exits the heat dissipation member 40 directly or through the ventilation path 43. The air flowing through some of the flow paths 431, 432 merges with the ventilation path 43 and exits the heat dissipation member 40 from the ventilation path 43, which smooths the flow of air through the flow paths 431, 432 due to the chimney effect, thereby improving the heat dissipation performance of the multiple first fins 421 and the multiple second fins 422. This improves the heat dissipation performance of the heat dissipation member 40 and suppresses the temperature rise in the electric circuit 50.
[0068] The shapes of the first fins 421 and the second fins 422 are not limited to the above shapes and can be changed as appropriate. The first fins 421 and the second fins 422 are formed in a flat plate shape, but may be curved so that their shape in a planar view is an arc. Furthermore, the first fins 421 and the second fins 422 are formed in a symmetrical shape with respect to the ventilation passage 43, but may be formed in an asymmetrical shape with respect to the ventilation passage 43.
[0069] Furthermore, the ventilation passage 43 is provided in the center in the left-right direction on the surface 41A of the base material 41, but may be provided in an area shifted to the right or left from the center.
[0070] (3.3) Modification 3 A heat dissipation member 40 according to modification 3 will be described with reference to FIGS. 8 and 9. FIG.
[0071] In the heat dissipation member 40 of the basic configuration, the passage width of the ventilation passage 43 is constant (see FIG. 1 ). However, in the third modification, as shown in FIG. 8 , the passage width D3 of the lower portion of the ventilation passage 43 is wider than the passage width D4 of the upper portion of the ventilation passage 43. Here, the passage width of the ventilation passage 43 refers to the width of the ventilation passage 43 in the left-right direction, and is the width of the space between a line LN1 connecting the left ends (first ends 4211) of the first fins 421 and a line LN2 connecting the right ends (first ends 4221) of the second fins 422. Therefore, the passage width D3 of the lower portion of the ventilation passage 43 is the distance between the lines LN1 and LN2 at the lower end of the ventilation passage 43, and the passage width D4 of the upper portion of the ventilation passage 43 is the distance between the lines LN1 and LN2 at the upper end of the ventilation passage 43. Since the configuration is the same as the basic configuration except for the passage width of the ventilation passage 43, the components common to the basic configuration are given the same reference numerals and illustrations and explanations thereof are omitted.
[0072] In the heat dissipation member 40 shown in Figure 8, the passage width of the ventilation passage 43 becomes wider as it goes downward, which has the advantage that air can more easily flow from the ventilation passage 43 into the flow path 431 between adjacent first fins 421 and the flow path 432 between adjacent second fins 422, compared to when the passage width of the ventilation passage 43 is constant.
[0073] 8, the passage width of the ventilation passage 43 changes linearly so as to become wider toward the bottom (in other words, so as to become narrower toward the top), but it may also change nonlinearly. Also, the passage width of the ventilation passage 43 may change in stages so that the passage width is wider at the bottom than at the top of the ventilation passage 43.
[0074] In addition, in the heat dissipation member 40 shown in Figure 8, each of the multiple first fins 421 and multiple second fins 422 is inclined so that the first ends 4211, 4221 closest to the ventilation passage 43 are positioned lower than the opposite second ends 4212, 4222, but the shapes of the first fins 421 and second fins 422 can be changed as appropriate.
[0075] As shown in Figure 9, in a heat dissipation member 40 in which each of the multiple first fins 421 and multiple second fins 422 is inclined obliquely so that the first ends 4211, 4221 closest to the ventilation passage are positioned higher than the opposite second ends 4212, 4222, the passage width at the bottom of the ventilation passage 43 may be wider than the passage width at the top of the ventilation passage 43.
[0076] Even in this case, compared to when the passage width of the ventilation passage 43 is constant, there is an advantage that the air flowing in the flow path 431 between two adjacent first fins 421 and the flow path 432 between two adjacent second fins 422 can more easily flow into the ventilation passage 43.
[0077] (3.4) Modification 4 A heat dissipation member 40 according to modification 4 will be described with reference to FIGS. 10 and 11. FIG.
[0078] FIG. 10 is a YZ cross-sectional view of the heat dissipation member 40 according to the fourth modification.
[0079] The heat dissipation member 40 of Modification 4 differs from the basic configuration in that the spacing D11 between the multiple first fins 421 is wider at the bottom of the base material 41 than at the top of the base material 41, and the spacing D12 between the multiple second fins 422 is wider at the bottom of the base material 41 than at the top of the base material 41. Here, the spacing D11 between the multiple first fins 421 refers to the spacing between two adjacent first fins 421 among the multiple first fins 421. Furthermore, the spacing D12 between the multiple second fins 422 refers to the spacing between two adjacent second fins 422 among the multiple second fins 422. Note that the heat dissipation member 40 of Modification 4 is similar to the basic configuration except that the spacing D11 between the multiple first fins 421 and the spacing D12 between the multiple second fins 422 change in the up-down direction. Therefore, components common to the basic configuration are denoted by the same reference numerals, and illustrations and descriptions thereof are omitted.
[0080] 10 , the spacing D11 between the first fins 421 increases toward the bottom, which has the advantage that air can more easily flow from the ventilation passages 43 into the flow paths 431 between adjacent first fins 421 than when the spacing D11 between the first fins 421 is constant. Similarly, the spacing D12 between the second fins 422 increases toward the bottom, which has the advantage that air can more easily flow from the ventilation passages 43 into the flow paths 432 between adjacent second fins 422 than when the spacing D12 between the second fins 422 is constant.
[0081] In the example of Figure 10, the spacing D11 between the first fins 421 and the spacing D12 between the second fins 422 increase by a constant increment so that they become wider as they go downward on the base material 41, but they may also change non-linearly.
[0082] In addition, in the heat dissipation member 40 shown in Figure 10, each of the multiple first fins 421 and multiple second fins 422 is inclined so that the first ends 4211, 4221 closest to the ventilation passage 43 are positioned lower than the opposite second ends 4212, 4222, but the shapes of the first fins 421 and second fins 422 can be changed as appropriate.
[0083] As shown in Figure 11, in a heat dissipation member 40 in which each of the multiple first fins 421 and multiple second fins 422 is inclined obliquely so that the first ends 4211, 4221 closest to the ventilation passage 43 are positioned higher than the opposite second ends 4212, 4222, the spacing D11 between the first fins 421 and the spacing D12 between the second fins 422 may be wider at the bottom of the base material 41 than at the top of the base material 41.
[0084] Even in this case, there is an advantage that the air flowing through the flow path 431 between adjacent first fins 421 and the flow path 432 between adjacent second fins 422 can more easily flow into the ventilation passage 43, compared to when the spacing D11 between the first fins 421 and the spacing D12 between the second fins 422 are constant.
[0085] (3.5) Modification 5 A heat dissipation member 40 according to modification 5 will be described with reference to FIGS. 12 and 13. FIG.
[0086] FIG. 12 is a YZ cross-sectional view of the heat dissipation member 40 according to the fifth modification.
[0087] The heat dissipation member 40 of the fifth modification differs from the basic configuration in that the inclination (angle) θ1 of the first direction DR1, along which the first fins 421 extend, with respect to the up-down direction is larger at the lower part of the base material 41 than at the upper part of the base material 41, and the inclination (angle) θ2 of the second direction DR2, along which the second fins 422 extend, with respect to the up-down direction is larger at the lower part of the base material 41 than at the upper part of the base material 41. Note that, since the heat dissipation member 40 of the fifth modification is the same as the basic configuration except for the first fins 421 and the second fins 422, the components common to the basic configuration are denoted by the same reference numerals, and illustrations and descriptions thereof will be omitted.
[0088] 12 , the inclination θ1 of the first direction DR1 (i.e., the longitudinal direction of the first fins 421) with respect to the up-down direction differs among the multiple first fins 421. Furthermore, the inclination θ2 of the second direction DR2 (i.e., the longitudinal direction of the second fins 422) with respect to the up-down direction differs among the multiple second fins 422.
[0089] More specifically, the inclination θ1 of the first direction DR1 with respect to the up-down direction between the multiple first fins 421 gradually increases from the top to the bottom of the base material 41. This makes the flow paths 431 between adjacent first fins 421 wider at the bottom than at the top of the base material 41, making it easier for air to flow through the flow paths 431, which has the advantage of improving heat dissipation performance.
[0090] Similarly, between the multiple second fins 422, the inclination θ2 of the second direction DR2 with respect to the up-down direction gradually increases from the top to the bottom of the base material 41. As a result, the flow paths 432 between adjacent second fins 422 are wider at the bottom than at the top of the base material 41, making it easier for air to flow through the flow paths 432, which has the advantage of improving heat dissipation performance.
[0091] 12, the inclination θ1 of the first direction DR1 with respect to the up-down direction and the inclination θ2 of the second direction DR2 with respect to the up-down direction each gradually increase by a constant amount from the top to the bottom of the base material 41, but the inclination does not necessarily have to be constant. The inclination θ1 of the first direction DR1 with respect to the up-down direction and the inclination θ2 of the second direction DR2 with respect to the up-down direction each may increase nonlinearly from the top to the bottom of the base material 41.
[0092] In addition, in the heat dissipation member 40 shown in Figure 12, each of the multiple first fins 421 and multiple second fins 422 is inclined so that the first ends 4211, 4221 closest to the ventilation passage 43 are positioned lower than the second ends 4212, 4222 on the opposite side, but the shapes of the first fins 421 and second fins 422 can be changed as appropriate.
[0093] As shown in Figure 13, in a heat dissipation member 40 in which each of the multiple first fins 421 and multiple second fins 422 is inclined obliquely so that the first ends 4211, 4221 closest to the ventilation passage 43 are positioned higher than the opposite second ends 4212, 4222, the inclination (angle) θ1 of the first direction DR1 relative to the vertical direction and the inclination (angle) θ2 of the second direction DR2 relative to the vertical direction may each be configured to be larger at the bottom than at the top of the base material 41.
[0094] In this case, the width of the portion where the flow path 431 is connected to the ventilation passage 43 and the width of the portion where the flow path 432 is connected to the ventilation passage 43 are both wider than when the inclination θ1 of the first direction DR1 with respect to the up-down direction and the inclination θ2 of the second direction DR2 with respect to the up-down direction are constant. This makes it easier for the air flowing through the flow paths 431 and 432 to flow into the ventilation passage 43, improving the heat dissipation performance of the first fins 421 and the second fins 422 and reducing the temperature rise in the electric circuit 50.
[0095] (3.6) Modification 6 A heat dissipation member 40 according to modification 6 will be described with reference to FIG.
[0096] FIG. 14 is a side view of a heat dissipation member 40 according to the sixth modification.
[0097] The heat dissipation member 40 of Modification 6 differs from the basic configuration in that the upper first fins of the plurality of first fins 421A to 421E are configured to have a greater amount of protrusion H1 from the base material 41 than the lower first fins. The heat dissipation member 40 of Modification 6 also differs from the basic configuration in that the upper second fins of the plurality of second fins 422A to 422E are configured to have a greater amount of protrusion H1 from the base material 41 than the lower second fins. Note that the heat dissipation member 40 of Modification 6 is similar to the basic configuration except for the amount of protrusion H1 of the plurality of first fins 421A to 421E and the plurality of second fins 422A to 422E from the base material 41. Therefore, components common to the basic configuration are denoted by the same reference numerals, and illustrations and descriptions thereof are omitted.
[0098] As described above, in heat dissipation member 40 of modification 6, of the plurality of first fins 421A to 421E, the amount of protrusion H1 of the upper first fin from base material 41 is larger than the amount of protrusion H1 of the lower first fin from base material 41. Furthermore, of the plurality of second fins 422, the amount of protrusion H1 of the upper second fin 422 from base material 41 is larger than the amount of protrusion H1 of the lower second fin 422 from base material 41.
[0099] Since the first fins 421 and second fins 422 on the upper side have a larger protrusion amount H1 from the base material 41 than the first fins 421 and second fins 422 on the lower side, the heat dissipation area of the first fins 421 and second fins 422 on the upper side can be made larger than when the protrusion amount H1 is constant. Therefore, when the upper part of the housing 30 is hotter than the lower part, there is an advantage in that the temperature of the upper part of the housing 30, which is hotter, can be reduced by making the heat dissipation area of the upper first fins 421 and second fins 422 larger than the heat dissipation area of the lower first fins 421 and second fins 422.
[0100] (3.7) Modification 7 A motor device 1 including a heat dissipation member 40 according to modification 7 will be described with reference to FIG.
[0101] The motor device 1 of the seventh modification differs from the motor device 1 described in the basic configuration in that the second housing 30 of the electric device 3, which includes the heat dissipation member 40, is connected to the first housing 20 of the motor 2 via a plurality of heat dissipation fins 42A. Note that components common to the basic configuration are given the same reference numerals, and illustrations and descriptions thereof will be omitted.
[0102] In the motor device 1 of the seventh modification, the base material 41 is attached to the first housing 20 so as to cover the front opening of the first housing 20. The electric device 3 is attached to the motor 2 so that the tips of the plurality of heat dissipation fins 42A provided on the surface 41A of the base material 41 contact the cover member 201 of the motor device 1.
[0103] In variant example 7, the second housing 30 of the electrical equipment 3 is not in direct contact with the first housing 20 of the motor 2, and multiple heat dissipation fins 42A are interposed between the second housing 30 and the first housing 20, which has the effect of making the electrical equipment 3 less susceptible to the effects of heat generated by the motor 2.
[0104] Furthermore, the first housing 20 and the second housing 30 are connected via a plurality of heat dissipation fins 42A, and a space through which air flows is formed between the first housing 20 and the second housing 30, so that the chimney effect makes it easier for cold air from outside to enter the flow paths between the plurality of heat dissipation fins 42A. This increases the efficiency of heat exchange in the plurality of heat dissipation fins 42A, and makes it possible to reduce the temperature rise of the electric circuit 50 housed in the second housing 30.
[0105] (3.8) Other Modifications In the basic configuration and modifications 1 to 7, the electric device 3 to which the heat dissipation member 40 is attached is described as an example of a control unit for the motor 2, but the electric device 3 is not limited to the control unit for the motor 2. The electric device 3 may be a control unit for a controlled device other than the motor 2, a power supply unit that supplies power to a load, a voltage conversion unit such as an AC-DC converter, or the like.
[0106] Furthermore, the heat dissipation member 40 is attached to the housing 30 of the electrical equipment 3, but the heat dissipation member 40 may also be attached directly to a heat-generating component such as a switching element or indirectly via a heat dissipation sheet or the like, to dissipate heat from the heat-generating component.
[0107] (Summary) The above-described embodiments and the like disclose the following aspects.
[0108] The heat dissipation member (40) of the first aspect includes a substrate (41) and a plurality of heat dissipation fins (42A) provided on a surface (41A) of the substrate (41). A ventilation passage (43) is provided on the surface (41A) of the substrate (41) between a first region (R1) and a second region (R2) along the vertical direction. The plurality of heat dissipation fins (42A) include a plurality of first fins (421) provided in the first region (R1) and a plurality of second fins (422) provided in the second region (R2). The plurality of first fins (421) are formed in a plate shape extending along a first direction (DR1), and the plurality of second fins (422) are formed in a plate shape extending along a second direction (DR2). When viewed from the normal direction of the surface (41A), the first direction (DR1) and the second direction (DR2) are each obliquely inclined relative to the vertical direction.
[0109] According to this aspect, the plurality of first fins (421) and the plurality of second fins (422) are inclined obliquely with respect to the vertical direction. Therefore, the flow paths between the plurality of first fins (421) and the flow paths between the plurality of second fins (422) are each inclined obliquely with respect to the vertical direction. This causes the air flowing through the flow paths to avoid the upper center of the surface (41A) of the substrate (41), thereby preventing the air flow from being obstructed by thermal interference. Therefore, by smoothing the movement of air within the flow paths, the heat dissipation performance of the heat dissipation member (40) can be improved.
[0110] In the heat dissipation member (40) of the second aspect, the plurality of first fins (421) and the plurality of second fins (422) of the first aspect are formed symmetrically with respect to the ventilation passage (43).
[0111] According to this aspect, the air flow in the flow passages between the plurality of first fins (421) and the air flow in the flow passages between the plurality of second fins (422) can be made uniform.
[0112] In the heat dissipation member (40) of the third aspect, in the first or second aspect, each of the plurality of first fins (421) and the plurality of second fins (422) is inclined obliquely so that the first end (4211, 4221) close to the ventilation passage (43) is positioned lower than the second end (4212, 4222) on the opposite side.
[0113] According to this aspect, air moves outward through the flow paths between the multiple first fins (421) and the flow paths between the multiple second fins (422), thereby smoothing the flow of air in the flow paths and improving the heat dissipation performance of the multiple first fins (421) and the multiple second fins (422).
[0114] In the heat dissipation member (40) of the fourth aspect, in the first or second aspect, each of the plurality of first fins (421) and the plurality of second fins (422) is inclined obliquely so that the first end (4211, 4221) close to the ventilation passage (43) is positioned higher than the second end (4212, 4222) on the opposite side.
[0115] According to this aspect, air flows from the flow paths between the plurality of first fins (421) and the flow paths between the plurality of second fins (422) to merge into the ventilation passage (43), so that the chimney effect makes the air flow in the flow paths smoother, thereby improving the heat dissipation performance of the plurality of first fins (421) and the plurality of second fins (422).
[0116] In the heat dissipation member (40) of the fifth aspect, in any one of the first to fourth aspects, the passage width of the lower part of the ventilation passage (43) is wider than the passage width of the upper part of the ventilation passage (43).
[0117] According to this aspect, there is an advantage that the air flow between the flow path between the plurality of first fins (421) and the ventilation path (43) is smoother in the lower part than in the upper part of the ventilation path (43), and the air flow between the flow path between the plurality of second fins (422) and the ventilation path (43) is smoother.
[0118] In the heat dissipation member (40) of the sixth aspect, in any of the first to fifth aspects, the spacing between the multiple first fins (421) is wider at the bottom of the substrate (41) than at the top of the substrate (41), and the spacing between the multiple second fins (422) is wider at the bottom of the substrate (41) than at the top of the substrate (41).
[0119] According to this embodiment, there is an advantage that the air flow between the flow paths between the plurality of first fins (421) and the ventilation passage (43) is smoother in the lower part of the base material (41) than in the upper part, and the air flow between the flow paths between the plurality of second fins (422) and the ventilation passage (43) is smoother.
[0120] In the heat dissipation member (40) of the seventh aspect, in any of the first to sixth aspects, the inclination of the first direction (DR1) relative to the vertical direction is greater in the lower part of the substrate (41) than in the upper part of the substrate (41), and the inclination of the second direction (DR2) relative to the vertical direction is greater in the lower part of the substrate (41) than in the upper part of the substrate (41).
[0121] According to this embodiment, there is an advantage that the air flow between the flow paths between the plurality of first fins (421) and the ventilation passage (43) is smoother in the lower part of the base material (41) than in the upper part, and the air flow between the flow paths between the plurality of second fins (422) and the ventilation passage (43) is smoother.
[0122] In the heat dissipation member (40) of the eighth aspect, in any one of the first to seventh aspects, the amount of protrusion from the base material (41) of the upper first fin (421) among the plurality of first fins (421) is greater than the amount of protrusion from the base material (41) of the lower first fin (421). The amount of protrusion from the base material (41) of the upper second fin (422) among the plurality of second fins (422) is greater than the amount of protrusion from the base material (41) of the lower second fin (422).
[0123] According to this embodiment, the surface area of the first fin (421) and the second fin (422) on the upper part of the base material (41) can be increased compared to when the protrusion amount is constant, thereby improving the heat dissipation performance.
[0124] The heat dissipation member (40) of the ninth aspect is the same as that of any of the first to eighth aspects, and includes a cover member (70) arranged opposite the surface (41A) of the substrate (41), and the tips of the plurality of heat dissipation fins (42A) are in contact with the cover member (70).
[0125] According to this aspect, the heat radiation performance of the plurality of heat radiation fins (42A) can be improved by the chimney effect.
[0126] An electric device (3) of a tenth aspect includes a housing (30) that houses an electric circuit (50), and the heat dissipation member (40) of any one of the first to ninth aspects. A base material (41) of the heat dissipation member (40) is attached to the housing (30).
[0127] This embodiment has the advantage of being able to reduce the temperature rise in the electric circuit (50).
[0128] A motor device (1) of an eleventh aspect includes a motor (2) having a first housing (20), a second housing (30) attached to the first housing (20), and a heat dissipation member (40) of any of the first to ninth aspects. The first housing (20) houses a rotor (23) and a stator (21). The second housing (30) houses a drive circuit (50) that drives the motor (2). A base material (41) of the heat dissipation member (40) is attached to the second housing (30).
[0129] This embodiment has the advantage of being able to reduce the temperature rise in the drive circuit (50) of the motor (2).
[0130] The configurations according to the second to ninth aspects are not essential for the heat dissipation member (40) and can be omitted as appropriate.
[0131] REFERENCE SIGNS LIST 1 motor device 2 motor 3 electrical equipment 20 first housing 21 stator 23 rotor 30 housing (second housing) 40 heat dissipation member 41 base material 41A surface 42A heat dissipation fin 43 ventilation passage 50 electrical circuit (drive circuit) 70 cover member 421 first fin 422 second fin 4211, 4221 first end 4212, 4222 second end DR1 first direction DR2 second direction R1 first region R2 second region
Claims
1. The material comprises a base material and a plurality of heat dissipation fins provided on the surface of the base material, On the surface of the substrate, a ventilation passage is provided between the first region and the second region, extending in the vertical direction. The plurality of heat dissipation fins include a plurality of first fins provided in the first region and a plurality of second fins provided in the second region. The plurality of first fins are formed in a plate shape extending along the first direction, The plurality of second fins are formed in a plate shape extending along the second direction, Viewed from the normal direction of the surface, the first direction and the second direction are each inclined diagonally with respect to the vertical direction. Heat dissipation component.
2. The plurality of first fins and the plurality of second fins are formed in a shape symmetrical with respect to the air passage. The heat dissipation member according to claim 1.
3. Each of the plurality of first fins and the plurality of second fins is inclined diagonally such that the first end closest to the air passage is located lower than the second end on the opposite side. The heat dissipation member according to claim 1 or 2.
4. Each of the plurality of first fins and the plurality of second fins is inclined diagonally such that the first end closest to the air passage is located above the second end on the opposite side. The heat dissipation member according to claim 1 or 2.
5. The width of the lower passage of the ventilation passage is wider than the width of the upper passage of the ventilation passage. The heat dissipation member according to claim 1 or 2.
6. The spacing between the plurality of first fins is wider at the bottom of the substrate than at the top of the substrate, and the spacing between the plurality of second fins is wider at the bottom of the substrate than at the top of the substrate. The heat dissipation member according to claim 1 or 2.
7. The inclination in the first direction with respect to the vertical direction is greater at the lower part of the substrate than at the upper part of the substrate. The inclination in the second direction with respect to the vertical direction is greater at the lower part of the substrate than at the upper part of the substrate. The heat dissipation member according to claim 1 or 2.
8. Of the plurality of first fins, the amount of protrusion of the upper first fin from the base material is greater than the amount of protrusion of the lower first fin from the base material. Of the plurality of second fins, the amount of protrusion of the upper second fin from the base material is greater than the amount of protrusion of the lower second fin from the base material. The heat dissipation member according to claim 1 or 2.
9. The base material comprises a cover member positioned opposite to the surface thereof, The tips of the plurality of heat dissipation fins are in contact with the cover member. The heat dissipation member according to claim 1 or 2.
10. A housing for electrical circuits, A heat dissipation member according to claim 1 or 2, comprising: The base material of the heat dissipation member is attached to the housing. Electrical equipment.
11. A motor having a first housing that accommodates a rotor and a stator, A second housing, which houses a drive circuit for driving the motor and is attached to the first housing, A heat dissipation member according to claim 1 or 2, comprising: The base material of the heat dissipation member is attached to the second housing. Motor device.