WO2015145809A1

WO2015145809A1 - Heat sink device and motor with control device

Info

Publication number: WO2015145809A1
Application number: PCT/JP2014/073652
Authority: WO
Inventors: 加藤　健次; 崇米澤
Original assignee: 三菱電機株式会社
Priority date: 2014-03-27
Filing date: 2014-09-08
Publication date: 2015-10-01
Also published as: JP2017098274A; TW201537135A

Abstract

A surface of a base is 3-way-partitioned, along the y-direction, into a first partition, a second partition, and a third partition which is sandwiched between the first partition and the second partition. First fins erected in the first partition and second fins erected in the second partition are configured so as to be parallel to the y-z plane. A third fin erected in the third partition is configured so as to be parallel to the y-z plane. Fourth fins and fifth fins erected on the third fin are configured so as to be parallel to a plane that is not parallel to the y-z plane. The fourth fins and fifth fins have a gap in the z-direction with respect to the surface of the base so as to not come into contact with the base.

Description

Heat sink device and motor with control device

The present invention relates to a heat sink device provided with heat radiation fins (hereinafter abbreviated as fins) for cooling heat generating elements in a control circuit, and a motor with a control device including the heat sink device.

Conventionally, electronic components (heat generating elements) such as semiconductor elements are cooled by a heat sink device provided with a plurality of fins. Further, the drive device controlled by the control circuit provided in the storage unit in the heat sink device may be integrated with the heat sink device.

Specifically, there is a motor in which a heat sink device provided with fins is integrally attached to the outer surface of a housing that houses a control circuit (see, for example, Patent Document 1). Here, in the prior art described in Patent Document 1, the motor is naturally air-cooled by the heat sink device regardless of the installation direction of the motor integrated with the heat sink device.

JP-A-11-122875 (page 6, FIG. 5)

However, the prior art has the following problems.
When a driving device integrated with a heat sink device is installed, there is a problem that the cooling performance and heat dissipation capability of some fins are lowered depending on the installation direction of the driving device, and the cooling performance is lowered as a whole.

More specifically, in the conventional technique described in Patent Document 1, when the motor installation direction is changed, some fins can be naturally cooled, but some fins have cooling performance and heat dissipation. The capacity decreases, and the cooling performance as a whole decreases. As a result, there is a problem that the temperature of an electronic component (cooling target part) such as a semiconductor element in the control circuit rises.

The present invention has been made in order to solve the above-described problems, and a heat sink device capable of efficiently cooling a drive device even when the installation direction of the integrated drive device is changed, and An object is to obtain a motor with a control device provided with the heat sink device.

A heat sink device according to the present invention is a heat sink device in which a plurality of fins are erected on the surface of a base and radiates heat from a portion to be cooled. The first surface is divided into three sections along the y direction into a first section, a second section, a first section and a third section sandwiched between the first section and the second section, and a first fin standing on the first section The second fin standing on the second section is configured to be parallel to the yz plane, and the third fin standing on the third section is parallel to the yz plane. The fourth fin and the fifth fin that are configured and are erected on the third fin are configured to be parallel to a plane that is not parallel to the yz plane, and the fourth fin and the fifth fin do not contact the base As shown in Fig. And those are.
A motor with a control device according to the present invention includes the above heat sink device and a motor to which the heat sink device is attached. The heat sink device includes a casing and a cooling target portion that is in close contact with the base, and the operation of the motor And a control device housed inside the housing.

According to the present invention, the surface of the base is divided into three sections, a first section, a second section, and a third section, and the shape and arrangement of the fins standing in each section are changed for each section, thereby allowing natural convection. To increase the intake area. Thereby, even if the installation direction of the integrated drive device is changed, a heat sink device that can efficiently cool the drive device and a motor with a control device including the heat sink device can be obtained.

It is a perspective view at the time of installing horizontally the motor with a control device by Embodiment 1 of the present invention. It is sectional drawing seen from the y-axis direction of the motor with a control apparatus of FIG. 1 by Embodiment 1 of this invention. It is sectional drawing seen from the x-axis direction of the motor with a control apparatus of FIG. 1 by Embodiment 1 of this invention. It is a perspective view at the time of installing vertically the motor with a control device by Embodiment 1 of the present invention. It is a perspective view at the time of installing the motor with a control apparatus by Embodiment 2 of this invention inclining with respect to the horizontal. It is a perspective view at the time of installing horizontally the motor with a control device by Embodiment 3 of the present invention. It is a perspective view at the time of installing vertically the motor with a control device by Embodiment 3 of the present invention. It is a perspective view at the time of installing horizontally the motor with a control device by Embodiment 4 of this invention. It is a perspective view at the time of installing vertically the motor with a control device by Embodiment 4 of this invention. It is a perspective view at the time of installing horizontally the motor with a control device by Embodiment 5 of the present invention. It is a perspective view at the time of installing vertically the motor with a control apparatus by Embodiment 5 of this invention.

Hereinafter, a heat sink device according to the present invention and a motor with a control device including the heat sink device will be described with reference to the drawings according to a preferred embodiment. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

In the following embodiments, in order to specifically show the effects obtained by the present invention, a motor (motor with a control device) is illustrated in detail as a specific example of a drive device to which the present invention is applied. explain. Further, in each of the following embodiments, when describing the shape, arrangement, etc. of each fin standing on the base of the heat sink device, in a three-dimensional space composed of x, y, and z directions orthogonal to each other The description will be made on the basis of a state in which the axial direction of the motor integrated with the heat sink device of the present invention coincides with the y direction and the base of the heat sink device is positioned parallel to the xy plane.

Embodiment 1 FIG.
FIG. 1 is a perspective view when a motor with a control device according to Embodiment 1 of the present invention is horizontally installed, and FIG. 2 is a cross-sectional view seen in the y-axis direction near the center in the motor axis direction.

As shown in FIG. 1, a heat sink device 5 is attached to the upper surface of the motor frame 2 of the motor 1. Further, the heat sink device 5 includes the control device 3, the casing 4, the base 6, the front fin 7 (first fin), the rear fin 8 (second fin), the central first fin 9 (third fin), and the center. It has the 2nd fin 10 (4th fin and 5th fin).

A control device 3 that controls the operation of the motor 1 is housed in the housing 4 of the heat sink device 5 (the housing portion of the housing 4), and a heat sink is integrally formed on the top of the housing 4. A front fin 7, a rear fin 8, a central first fin 9, and a central second fin 10 are erected on the surface of the base 6 of the heat sink device 5 as a plurality of fins.

Here, the heat sink device 5 according to the first embodiment includes a first section, a second section, and a surface of the base 6 along the y direction in a space configured by the x direction, the y direction, and the z direction. It has the technical feature that it is divided into a third section sandwiched between the first section and the second section, and the shape and arrangement of the fins standing in each section are changed for each section.

That is, in the first embodiment, the front fins 7 standing in the first section and the rear fins 8 standing in the second section are configured to be parallel to the yz plane. Further, the central first fin 9 erected in the third section is configured to be parallel to the yz plane. Further, the central second fin 10 provided symmetrically on both side surfaces of the central first fin 9 is configured to be parallel to a plane that is not parallel to the yz plane. Hereinafter, each fin standing on the base 6 will be described in more detail.

A plurality of front fins 7 are provided in the front part (first section) of the base 6 of the heat sink device 5 in the direction parallel to the axis (rotation axis) of the motor 1, and the rear part (second section). Are provided with a plurality of rear fins 8 in a direction parallel to the axis of the motor 1. As can be seen from FIG. 1, each fin width of the rear fin 8 is longer than each fin width of the front fin 7. That is, the length of the rear fin 8 in the y-axis direction is longer than that of the front fin 7.

A single central first fin 9 is provided in the central portion (third section) of the base 6 of the heat sink device 5 in the direction parallel to the axis of the motor 1. A plurality of central second fins 10 are provided on both side surfaces of the central first fin 9 so as to be perpendicular to the axis of the motor 1 and not in contact with the base 6, and between the base 6 and the central second fin 10. Is configured to have a gap 11. As can be seen from FIG. 1, the fin thickness (thickness) of the central first fin 9 is larger than the fin thickness of the central second fin 10.

In the heat sink device 5, the housing 4 including the heat sink (each fin) is made of, for example, aluminum. Moreover, it is preferable that the housing | casing 4, the front part fin 7, the rear part fin 8, the center 1st fin 9, and the center 2nd fin 10 are integrally formed.

As shown in FIG. 2, inside the control device 3, electronic components 14 that control the rotation operation of the motor 1 are mounted on both sides of the substrate 15, and the semiconductor element 12 that generates heat is interposed through the heat conductive material 13. Are attached so as to be in close contact with the base 6. For the heat conductive material 13, for example, thermal grease or a thermal sheet is used. The semiconductor element 12 is preferably arranged so as to overlap the central first fin 9 when viewed in the y-axis direction.

According to such a configuration, the heat generated in the semiconductor element 12 is transmitted from the base 6 of the heat sink device 5 to the front fin 7, the rear fin 8, and the central first fin 9. The heat transmitted to the central first fin 9 is transmitted to the central second fin 10.

When the gravity direction is the -z direction, cooling air 16 flowing in the direction shown by the arrow in FIG. 1 is generated. Specifically, around the front fin 7, the temperature of the surrounding air rises due to the transmitted heat, and air is sucked from the front surface (−y direction) of the housing 4 due to the density difference of the air. The cooling air 16 that passes between the two and flows upward (in the + z direction) is generated. Similarly, around the rear fin 8, the temperature of the surrounding air rises due to the transmitted heat, and the air is sucked from the rear surface (+ y direction) of the housing 4 due to the density difference of the air and passes between the rear fins 8. The cooling air 16 flowing upward (+ z direction) is generated.

Further, around the central second fin 10, the temperature of the surrounding air rises due to the transmitted heat, and the air is sucked from the side surface (± x direction) of the casing due to the density difference of the air. Cooling air 16 passing between the first fins 9 and flowing upward (+ z direction) is generated. With this cooling air 16, the base 6, the front fin 7, the rear fin 8, the central first fin 9, and the central second fin 10 are cooled by natural air cooling, and the semiconductor element 12 is cooled.

When the heat sink device 5 of the present invention is applied to the motor 1, as shown in FIG. 1, in the front fin 7 and the rear fin 8, fins are arranged in a direction parallel to the axis of the motor 1 (y-axis direction). In the central second fin 10, the heat sink device 5 is attached to the motor 1 so that the fin is arranged in a direction perpendicular to the axis of the motor 1 (x-axis direction). Thereby, the cooling air 16 can be sucked from all directions of the front surface, the rear surface, and the side surface of the control device 3. And by increasing the intake area, the amount of natural air-cooled cooling air can be increased, and the heat dissipation characteristics can be improved.

Also, the fin efficiency of the central first fin 9 is improved by making the fin thickness of the central first fin 9 larger than the fin thickness of the central second fin 10. Furthermore, the heat resistance until the heat of the semiconductor element 12 is transmitted from the central first fin 9 to the central second fin 10 is reduced, and heat can be efficiently transmitted to the central second fin 10, so that the heat dissipation characteristics are improved.

FIG. 3 is a side view of the motor 1 attached to the L flange 17 as seen from the x-axis direction.

As shown in FIG. 3, the motor 1 is often used with its front surface fixed to an L flange 17. As described above, when the motor 1 is fixed to the L flange 17, it is conceivable that the intake portion of the front fin 7 and the L flange 17 approach and the pressure loss of the intake portion increases.

On the other hand, in the heat sink device 5, the fin width of the rear fin 8 is made longer than the fin width of the front fin 7, so that a countermeasure when the front surface of the motor 1 is fixed to the L flange 17 is used. I am trying.

That is, since the intake portion of the rear fin 8 is open, the pressure loss in the intake portion is small. Therefore, the cooling air 16 flowing between the front fins 7 is small, and the cooling air 16 flowing between the rear fins 8 is increased. Therefore, by making the fin width of the rear fin 8 longer than the fin width of the front fin 7, cooling can be efficiently performed and heat dissipation characteristics are improved.

FIG. 4 is a perspective view showing a state in which the motor 1 is arranged so that the axis of the motor 1 is in the gravity direction (+ y direction).

Conventionally, when the motor installation direction is changed from the horizontal state shown in FIG. 1 to the vertical state shown in FIG. 3, some fins can be naturally cooled, but some fins have cooling performance and heat dissipation capability. There is a problem that the cooling performance is lowered as a whole.

On the other hand, in the heat sink device 5, a clearance 11 is provided between the central second fin 10 and the base 6 to take measures when the installation direction of the motor is changed.

That is, as shown in FIG. 4, even if the motor 1 is arranged in the vertical direction so that the direction of gravity is the + y-axis direction, the cooling air 16 flows through the gap 11 and is naturally cooled, so the base 6 is cooled. And the heat dissipation characteristics are improved.

As described above, according to the first embodiment, in the three-dimensional space composed of the x direction, the y direction, and the z direction, the first section is erected on the first section on the surface of the base located in parallel with the xy plane. The first fin (front fin) and the second fin (rear fin) standing on the second section are configured to be parallel to the yz plane, and the third fin standing on the third section The (center first fin) is configured to be parallel to the yz plane.

The fourth fin and the fifth fin (center second fin) standing on the third fin are configured to be parallel to a plane that is not parallel to the yz plane (the xz plane in the first embodiment). The fourth fin and the fifth fin have a gap in the z direction with respect to the surface of the base so as not to contact the base.

As a result, when the present invention is applied to a motor, the direction of the fins of the heat sink device changes between the front and rear portions of the motor and the central portion of the motor, so that the intake area of natural convection is expanded and passes between the fins. The air volume to be increased increases and the cooling performance is improved. Further, by providing a gap between the center second fin and the base, cooling air flows between the fins even when the motor is installed in the vertical direction, and the cooling performance is improved.

That is, since the air can be sucked in from the front, rear and side surfaces of the housing, the heat dissipation characteristics are improved. In addition, since a gap is provided between the center second fin and the base, even if the drive device main body is arranged in the vertical direction (even if the motor shaft is arranged in the gravitational direction), the gap is filled with air. It can flow and cool the base.

Further, the fin thickness of the third fin is configured to be larger than the thickness of each of the fourth fin and the fifth fin. Thereby, the thermal resistance until the heat of the semiconductor element is transferred to the central second fin through the central first fin is reduced, and the cooling performance is improved.

Further, the y-direction fin width of the second fin is configured to be longer than the y-direction fin width of the first fin. Thereby, even if it is a case where this invention is applied to a motor and the front surface of the motor integrated with the heat sink apparatus is fixed to L flange, a cooling performance can be improved. That is, by adopting such a configuration, the front fin has a motor mounting flange and the like, and it is difficult for air to flow in. However, when the periphery of the rear fin is open, air easily flows in and the heat radiation of the rear fin Large area improves cooling performance.

Embodiment 2. FIG.
FIG. 5 is a perspective view when the motor with a control device according to the second embodiment of the present invention is installed inclined with respect to the horizontal. As shown in FIG. 5, the fin height of the central first fin 9 is the same as the height of the gap provided between the central second fin 10 and the base, and the z-direction upper end surface of the central first fin 9 is set. The central second fin 10 is erected. That is, as compared with the first embodiment, the length of the central first fin 9 in the z-axis direction is shortened to a height that contacts the lower surface of the central second fin 10.

According to such a configuration, when the motor 1 is installed so that the direction of gravity is the + x direction, the heat generated in the semiconductor element 12 is transmitted from the base 6 of the heat sink device 5 to the central first fin 9, and The heat transferred to the first fin 9 is transferred to the central second fin 10.

Around the central second fin 10, the temperature of the surrounding air rises due to the transmitted heat, and the air is sucked from the + x direction due to the difference in air density, passes between the central second fins 10, and flows in the −x direction. Cooling air 16 is generated. With this cooling air 16, the base 6 and the central second fin 10 are cooled by natural air cooling, and the semiconductor element 12 is cooled.

In the heat sink device 5, since the length of the central first fin 9 in the z-axis direction is shortened, the pressure loss is low because the flow of the cooling air 16 flowing in the x-axis direction between the central second fins 10 is not obstructed. Cooling air volume increases and heat dissipation characteristics improve.

Further, similarly to the first embodiment, the fin efficiency of the central first fin 9 is improved by making the fin thickness of the central first fin 9 larger than the fin thickness of the central second fin 10. And the heat resistance until the heat | fever of the semiconductor element 12 is transmitted from the center 1st fin 9 to the center 2nd fin 10 becomes small, and since heat can be efficiently transmitted to the center 2nd fin 10, the heat dissipation characteristic improves.

As described above, according to the second embodiment, the fin height in the z direction of the third fin is the same as the gap, and the fourth fin and the fifth fin are erected on the upper end surface in the z direction of the third fin. It is comprised so that.

Therefore, even if the heat sink device is tilted, the flow of the cooling air flowing in the x-axis direction between the central second fins is not obstructed, so that the pressure loss is low, the cooling air volume is increased, and the heat radiation characteristics are improved. More specifically, when the present invention is applied to a motor, air flows between the central second fins even when the motor shaft is inclined in the circumferential direction, and the cooling performance is improved.

Embodiment 3 FIG.
6 and 7 are perspective views showing a motor with a control device according to Embodiment 3 of the present invention. Here, FIG. 6 shows a case where the gravity direction is set to the −z direction, and FIG. 7 shows a case where the gravity direction is set to the + y direction.

As shown in FIGS. 6 and 7, one central first fin 9 is provided in the central portion of the base 6 of the heat sink device 5 in the y-axis direction in a direction parallel to the axis of the motor 1. A plurality of central second fins 10 are provided on the side surfaces of the first and second fins so as not to contact the base 6.

Here, in the first embodiment, the central second fin 10 is parallel to the xz plane, whereas in the third embodiment, the central second fin 10 is configured as follows. The That is, the central second fin 10 erected on one end surface of the central first fin 9 is configured to be parallel to a plane obtained by rotating the xz plane in the + y direction around the z direction. . The central second fin 10 erected on the other end surface of the central first fin 9 is configured so that the xz plane is parallel to the plane rotated in the −y direction with the z direction as the center. ing.

In FIG. 6, in particular, the center second fin 10 is positioned such that the tip position is in the front direction (−y direction) in the axial direction of the motor 1 relative to the root position in contact with the center first fin 9. The central second fin 10 is configured to be V-shaped when viewed from the z-axis direction. Other configurations are the same as those in the first embodiment.

According to such a configuration, as shown in FIG. 6, when the gravity direction is in the −z direction, the same effect as in the first embodiment can be obtained.

On the other hand, when the gravity direction is the + y direction as shown in FIG. 7, the heat generated in the semiconductor element 12 is transmitted from the base 6 of the heat sink device 5 to the front fin 7, the rear fin 8, and the central first fin 9. The heat transmitted to the central first fin 9 is transmitted to the central second fin 10.

When the direction of gravity is the + y direction, the temperature of the surrounding air rises around the front fin 7 due to the transmitted heat, and air is sucked from the upper surface (+ z direction) of the housing 4 due to the density difference of the air. Cooling air 16 passing between the fins 7 and flowing in the front surface (−y direction) is generated.

Around the rear fins 8, the temperature of the surrounding air rises due to the transmitted heat, and due to the density difference of the air, the air is sucked from the rear surface (+ y direction) of the housing 4, passes between the rear fins 8, and the upper surface ( + Z direction) and cooling air 16 flowing in the center second fin 10 direction (−y direction) is generated.

In addition, around the central second fin 10, the temperature of the surrounding air rises due to the transmitted heat, and the air is sucked from the upper surface (+ z direction) of the housing 4 due to the density difference of the air. Cooling air 16 that passes between the first fins 9 and flows to the side surface (± x direction) is generated. With this cooling air 16, the base 6, the front fin 7, the rear fin 8, the central first fin 9, and the central second fin 10 are cooled by natural air cooling, and the semiconductor element 12 is cooled.

As described above, in the heat sink device 5 according to the third embodiment, the center second fin 10 has a tip position in the front direction (−y direction) of the motor 1 from the root position in contact with the center first fin 9. ) And the center second fin 10 is arranged in a V shape when viewed from the z-axis direction. Therefore, even if the gravity direction is the + y direction, the flow of the cooling air 16 that is sucked from the upper portion of the housing 4 and exhausted from the side surface is generated, so that the heat dissipation characteristics by natural air cooling can be improved.

Similarly to the first embodiment, the fin efficiency of the central first fin 9 is improved by making the fin thickness of the central first fin 9 larger than the fin thickness of the central second fin 10. The heat resistance until 12 heat is transferred from the central first fin 9 to the central second fin 10 is reduced, and heat can be efficiently transmitted to the central second fin 10, so that the heat dissipation characteristics are improved.

Similarly to the first embodiment, the heat sink device 5 fixes the front portion of the motor 1 to the L flange 17 by making the fin width of the rear fin 8 longer than the fin width of the front fin 7. However, the cooling can be efficiently performed and the heat dissipation characteristics are improved.

Similarly to the second embodiment, the fin height of the central first fin 9 of the heat sink device 5 is shortened so that the height reaches a position in contact with the lower surface of the central second fin 10. Even when the direction is the x direction, the flow of the cooling air 16 flowing in the x-axis direction between the central second fins 10 is not obstructed, so that the pressure loss is low, the amount of cooling air is increased, and the heat dissipation characteristics are improved.

As described above, according to the third embodiment, the fourth fin and the fifth fin standing on the third fin are configured as follows. That is, the fourth fin is configured to be parallel to a plane that is not parallel to the yz plane (in the third embodiment, the plane that is obtained by rotating the xz plane in the + y direction around the z direction). . The fifth fin is configured to be parallel to a plane that is not parallel to the yz plane (in the third embodiment, the xz plane is a plane rotated in the −y direction around the z direction). Yes.

Therefore, even if the heat sink device is tilted, a flow of cooling air that is sucked from the upper part of the housing and exhausted from the side surface is generated, so that the heat dissipation characteristics by natural air cooling can be improved. More specifically, when the present invention is applied to a motor, air is exhausted from the side surfaces of the fins of the housing, even if the motor is arranged in the vertical direction (even if the motor shaft is arranged in the direction of gravity). Therefore, the cooling performance is improved.

Embodiment 4 FIG.
8 and 9 are perspective views showing a motor with a control device according to Embodiment 4 of the present invention. Here, FIG. 8 shows a case where the gravity direction is set to the −z direction, and FIG. 9 shows a case where the gravity direction is set to the + y direction.

As shown in FIGS. 8 and 9, one central first fin 9 is provided in the central portion of the base 6 of the heat sink device 5 in the y-axis direction in a direction parallel to the axis of the motor 1. A plurality of central second fins 10 are provided on the side surfaces of the first and second fins so as not to contact the base 6.

Here, in the fourth embodiment, the central second fin 10 is configured to be parallel to a plane obtained by rotating the xz plane in the −y direction with the x direction as the center. That is, the central second fin 10 is configured so that the fin upper portion is inclined so as to be in the front direction of the motor 1 relative to the fin lower portion. Other configurations are the same as those of the first embodiment.

According to such a configuration, when the gravity direction is in the −z direction as shown in FIG. 8, the same effect as in the first embodiment can be obtained.

On the other hand, when the gravity direction is the + y direction as shown in FIG. 9, the heat generated in the semiconductor element 12 is transmitted from the base 6 of the heat sink device 5 to the front fin 7, the rear fin 8, and the central first fin 9. The heat transmitted to the central first fin 9 is transmitted to the central second fin 10.

In addition, around the central second fin 10, the temperature of the surrounding air rises due to the transmitted heat, and due to the difference in air density, air is sucked from the side surface (± x direction) of the housing 4 and the gap 11, and the central second fin 10. Cooling air 16 that passes between the fin 10 and the central first fin 9 and flows on the upper surface (+ z direction) is generated. With this cooling air 16, the base 6, the front fin 7, the rear fin 8, the central first fin 9, and the central second fin 10 are cooled by natural air cooling, and the semiconductor element 12 is cooled.

As described above, in the heat sink device 5 according to the fourth embodiment, the central second fin 10 is configured such that the fin upper portion is inclined so as to be in the front portion direction of the motor 1 relative to the fin lower portion. Therefore, even if the gravity direction becomes the + y direction, the flow of the cooling air 16 that is sucked from the side surface and the gap 11 of the housing 4 and exhausted from the upper surface is generated, so that the heat dissipation characteristics by natural air cooling can be improved.

Similarly to the second embodiment, the fin height of the central first fin 9 of the heat sink device 5 is shortened so that the height reaches a position in contact with the lower surface of the central second fin 10. Even when the direction is the x direction, the flow of the cooling air 16 flowing in the x-axis direction between the central second fins 10 is not obstructed, so that the pressure loss is low, the cooling air volume is increased, and the heat dissipation characteristics are improved.

As described above, according to the fourth embodiment, the fourth fin and the fifth fin are planes that are not parallel to the yz plane (in the fourth embodiment, the xz plane is rotated in the −y direction around the x direction). It is comprised so that it may become parallel to the (planar) plane.

Thus, even if the heat sink device is tilted, a flow of cooling air that is sucked from the side surface and the gap of the housing and exhausted from the upper surface is generated, so that the heat dissipation characteristics by natural air cooling can be improved. More specifically, when the present invention is applied to a motor, even if the motor is arranged in the vertical direction (even if the motor shaft is arranged in the gravitational direction), air is sucked from the side surface of the central second fin. Since the air is exhausted from the end opposite to the motor, the cooling performance is improved.

Embodiment 5 FIG.
10 and 11 are perspective views showing a motor with a control device according to Embodiment 5 of the present invention. Here, FIG. 10 shows a case where the gravity direction is set to the −z direction, and FIG. 11 shows a case where the gravity direction is set to the + y direction.

As shown in FIGS. 10 and 11, one central first fin 9 is provided in the central portion of the base 6 of the heat sink device 5 in the y-axis direction in a direction parallel to the axis of the motor 1. A plurality of central second fins 10 are provided on the side surfaces of the first and second fins so as not to contact the base 6.

Here, in the fifth embodiment, the central second fin 10 is configured to be parallel to a plane obtained by rotating the xz plane in the + y direction around the x direction. That is, the center second fin 10 is configured so that the fin upper portion is inclined so as to be in the rear portion direction of the motor 1 from the fin lower portion. Other configurations are the same as those in the first embodiment.

According to such a configuration, as shown in FIG. 10, when the gravity direction is in the −z direction, the same effect as in the first embodiment can be obtained.

On the other hand, as shown in FIG. 11, when the gravity direction is the + y direction, the heat generated in the semiconductor element 12 is transmitted from the base 6 of the heat sink device 5 to the front fin 7, the rear fin 8, and the central first fin 9. The heat transmitted to the central first fin 9 is transmitted to the central second fin 10.

In addition, around the central second fin 10, the temperature of the surrounding air rises due to the transmitted heat, and the air is sucked from the upper surface (+ z direction) of the housing 4 due to the density difference of the air. Cooling air 16 that passes between the first fins 9 and flows through the side surfaces (± x direction) and the gaps 11 is generated. With this cooling air 16, the base 6, the front fin 7, the rear fin 8, the central first fin 9, and the central second fin 10 are cooled by natural air cooling, and the semiconductor element 12 is cooled.

As described above, in the heat sink device 5 according to the fifth embodiment, the central second fin 10 is configured to be inclined so that the fin upper portion is in the rear direction of the motor 1 from the fin lower portion. Therefore, even if the gravity direction is the + y direction, the flow of the cooling air 16 that is sucked from the upper surface of the housing 4 and exhausted from the side surface and the gap 11 is generated, so that the heat dissipation characteristics by natural air cooling can be improved.

Further, similarly to the second embodiment, the length of the central first fin 9 of the heat sink device 5 in the z-axis direction is shortened to a height that contacts the lower surface of the central second fin 10. Even when the gravity direction is the x direction, the flow of the cooling air 16 flowing in the x-axis direction between the central second fins 10 is not hindered, so that the pressure loss is low, the cooling air volume is increased, and the heat radiation characteristics are improved.

As described above, according to the fifth embodiment, the fourth fin and the fifth fin are planes not parallel to the yz plane (in the fifth embodiment, the xz plane is rotated in the + y direction around the x direction). Configured to be parallel to

Thus, even if the gravity direction is the + y direction, a flow of cooling air that is sucked from the top surface of the housing and exhausted from the side surface and the gap is generated, so that the heat dissipation characteristics by natural air cooling can be improved. More specifically, when the present invention is applied to a motor, even if the motor is arranged in the vertical direction (even if the motor shaft is arranged in the direction of gravity), the central second fin on the opposite side of the motor. Since the air is sucked from the end and exhausted from the side surface and the gap between the base and the central second fin, the cooling performance is improved.

Claims

A heat sink device in which a plurality of fins are erected on the surface of a base located in parallel to the xy plane in a three-dimensional space composed of an x direction, a y direction, and a z direction, and also radiates heat from a cooling target portion. There,
The surface of the base is divided into three along the y direction into a first section, a second section, and a third section sandwiched between the first section and the second section,
The first fin standing on the first section and the second fin standing on the second section are configured to be parallel to the yz plane,
A third fin standing in the third section is configured to be parallel to the yz plane;
The fourth fin and the fifth fin standing on the third fin are configured to be parallel to a plane not parallel to the yz plane,
The heat sink device, wherein the fourth fin and the fifth fin have a gap in the z direction with respect to the surface of the base so as not to contact the base.
The heat sink device according to claim 1,
The heat sink device, wherein the fourth fin and the fifth fin are configured to be parallel to the xz plane as a plane not parallel to the yz plane.
The heat sink device according to claim 1,
The fourth fin is configured as a plane not parallel to the yz plane and parallel to a plane obtained by rotating the xz plane in the + y direction around the z direction.
The fifth fin is configured as a plane that is not parallel to the yz plane so that the xz plane is parallel to a plane rotated in the -y direction around the z direction. .
The heat sink device according to claim 1,
The fourth fin and the fifth fin are planes not parallel to the yz plane, and are parallel to a plane obtained by rotating the xz plane in the + y direction or the -y direction with the x direction as a center. The heat sink device is configured as follows.
The heat sink device according to any one of claims 1 to 4,
The fin thickness of the third fin is larger than the fin thickness of each of the fourth fin and the fifth fin.
The heat sink device according to any one of claims 1 to 5,
The fin width in the y direction of the second fin is longer than the fin width in the y direction of the first fin.
The heat sink device according to any one of claims 1 to 6,
The fin height in the z direction of the third fin is the same as that of the gap, and the fourth fin and the fifth fin are erected on the upper end surface in the z direction of the third fin. .
A heat sink device according to any one of claims 1 to 7,
A motor to which the heat sink device is attached;
With
The heat sink device is
A housing,
A control device that includes the cooling target portion that is in close contact with the base, controls the operation of the motor, and is housed in the housing;
A motor with a control device.