CN220554233U

CN220554233U - Electronic equipment

Info

Publication number: CN220554233U
Application number: CN202321879445.2U
Authority: CN
Inventors: 藤木孝; 前田高志
Original assignee: Yaskawa Electric Corp
Current assignee: Yaskawa Electric Corp
Priority date: 2022-07-19
Filing date: 2023-07-17
Publication date: 2024-03-01
Anticipated expiration: 2033-07-17
Also published as: JP2024012967A; JP7442585B2; CN117425311A

Abstract

The utility model provides an electronic device capable of improving cooling performance. The motor control device (1) is provided with: a housing (10); a radiator (7) provided with a plurality of first fins (27); a second circuit board (45) provided with a plurality of circuit components including a circuit component (47); a partition member (63) that partitions the interior of the housing (10) into a first storage space (S1) in which the plurality of first fins (27) and the circuit components (47) are stored, and a second storage space (S2) in which the circuit components other than the circuit components (47), the first circuit board (31), the third circuit board (24), and the like are stored; and a fan (19) that ventilates air to the first storage space (S1).

Description

Electronic equipment

Technical Field

Embodiments of the present utility model relate to electronic devices.

Background

Patent document 1 describes a structure for fixing a radiator and an assembly member of a motor control device. In this motor control apparatus, the inside of the housing is divided by the partition wall into a portion provided with a plurality of cooling fins for supplying air by the cooling fan and a circuit portion formed by providing circuit components on the circuit substrate.

Patent document 1: japanese patent laid-open No. 2009-253183

In the motor control apparatus of the related art described above, when a circuit component generating heat is provided on a circuit board, sufficient cooling may not be possible, and higher cooling performance may be required.

Disclosure of Invention

The present utility model has been made in view of the above-described problems, and an object of the present utility model is to provide an electronic device capable of improving cooling performance.

In order to solve the above-described problems, according to an aspect of the present utility model, there is applied an electronic device including: a housing; a heat sink having a plurality of first fins; a circuit substrate provided with a plurality of circuit components including a first circuit component; a partition member that partitions an interior of the case into a first accommodation space in which the plurality of first fins and the first circuit member are accommodated and a second accommodation space in which the circuit member other than the first circuit member is accommodated; and a fan that ventilates air to the first storage space.

In the above-described electronic device, the first housing space may have a ventilation space provided between the distal end portions of the plurality of first fins and the case, and the air may be ventilated in a direction intersecting the extending direction of the first fins.

In the above-described electronic device, the partition member may include: a bottom portion formed with a hole portion through which the first circuit member is inserted; a communication portion provided at an edge portion of the bottom portion on the first fin side, the communication portion forming a space into which the air flows; and a wall portion that is provided so as to stand up from the edge portion of the bottom portion other than the communication portion to the vicinity of the housing.

In the above-described electronic device, the case may have a top plate portion disposed on a side of the wall portion of the partition member opposite to the bottom portion, and the top plate portion may have a protruding portion on a surface on the inner side, the protruding portion extending along a shape of the wall portion and protruding so as to overlap with a distal end portion of the wall portion when viewed in a direction parallel to the top plate portion.

In the above-described electronic device, the communication portion may have an engagement portion that engages with the distal end portion of the first fin disposed closest to the partition member among the plurality of first fins.

In the above-described electronic device, the partition member may be fixed to the heat sink by screws together with the circuit board disposed between the partition member and the heat sink.

In the above-described electronic device, the heat sink may have a plurality of second fins arranged downstream of the first circuit member in the ventilation direction of the air.

In the above-described electronic device, the partition member may have an air guide portion for guiding the air to the second fin.

According to the electronic device and the like of the present utility model, cooling performance can be improved.

Drawings

Fig. 1 is a side view from the right side of an example of the appearance of a motor control device according to an embodiment.

Fig. 2 is a bottom view from below showing an example of the appearance of the motor control device according to the embodiment.

Fig. 3 is a top view from above showing an example of the appearance of the motor control device according to the embodiment.

Fig. 4 is an exploded perspective view showing an example of the internal structure of the motor control device according to the embodiment.

Fig. 5 is a perspective view showing an example of the structure of the partition member.

Fig. 6 is a side view from the right side showing an example of the structure of the partition member.

Fig. 7 is a side view from the right side of an example of a state in which the second circuit board is fixed to the heat sink in the assembly process of the motor control device.

Fig. 8 is a side view from the right side of an example of a state in which the partition member is fixed to the heat sink from above the second circuit board in the assembly process of the motor control device.

Fig. 9 is a cross-sectional view corresponding to section IX-IX in fig. 8.

Fig. 10 is a perspective view showing an example of a state in which the third circuit board is fixed to the heat sink in the assembly process of the motor control device.

Fig. 11 is a perspective view showing an example of the structure of the inner side of the right cover.

Fig. 12 is a cross-sectional view corresponding to the cross-section IX-IX in fig. 8 in a state where the right cover is attached to the radiator in the assembly process of the motor control apparatus 1.

Description of the reference numerals

1 Motor control device (electronic equipment)

3 right cover

3A roof portion

5 left cover

7 radiator

9 front panel

10 shell body

19 fan

27 first fin

37 ventilation space

43 second fin

45 second circuit board (Circuit board)

47 circuit component (first circuit component)

63 partition member

65 screw

83 bottom part

85A first communication part (communication part)

87 wall portion

89 hole part

92 engagement portion

95 wind-guiding portion

107 projection

S1 first accommodation space

S2 a second accommodation space

Detailed Description

An embodiment will be described with reference to the accompanying drawings. In the present embodiment, the motor control device that controls the motor is described as an example of the electronic device, but the electronic device is not limited to the motor control device. In the present embodiment, for convenience of explanation of the structure of the motor control device, directions such as up, down, left, right, front, rear, and the like are sometimes used as appropriate, but the arrangement direction of the motor control device and the positional relationship of the respective structures are not limited. Each direction in the embodiment corresponds to the direction shown in each figure.

< 1. Appearance structure of Motor control device >)

An example of the external configuration of the motor control device 1 according to the present embodiment will be described with reference to fig. 1 to 3. Fig. 1 is a side view of the motor control device 1 viewed from the right, fig. 2 is a bottom view of the motor control device 1 viewed from below, and fig. 3 is a top view of the motor control device 1 viewed from above.

As shown in fig. 1 to 3, the motor control device 1 includes a right cover 3, a left cover 5, a radiator 7, and a front panel 9. The right cover 3 is mounted on the right side of the radiator 7, and the left cover 5 is mounted on the left side of the radiator 7. The front panel 9 is mounted on the front side of the right and left covers 3 and 5. The right cover 3, the left cover 5, and the front panel 9 are made of, for example, resin, and the heat sink 7 is made of a material having high heat conductivity (for example, aluminum alloy). The right cover 3, the left cover 5, the radiator 7, and the front panel 9 are combined to form a substantially rectangular parallelepiped housing 10.

< 2. Internal Structure of Motor control device >

An example of the internal structure of the motor control device 1 according to the present embodiment will be described with reference to fig. 4. Fig. 4 is an exploded perspective view of the motor control device 1.

As shown in fig. 4, the heat sink 7 is formed in a substantially square frame shape. The heat sink 7 is a member that radiates heat of the circuit member to cool the circuit member, and is also a structural member that constitutes a housing of the motor control device 1. The radiator 7 has a front plate portion 11, a rear plate portion 13, an upper plate portion 15, and a lower plate portion 17.

The lower plate 17 is provided with a fan housing 21 for housing the fan 19. The fan housing 21 is a recess formed in the same shape as the fan 19. The fan 19 is fixed to the fan housing 21 via a fixing member 25 by a plurality of screws 23. The fan 19 is, for example, an axial fan, and discharges or sucks air in the direction of the rotation axis AX and ventilates the air in the up-down direction. In the present embodiment, the fan 19 sucks air from the lower side and discharges the air to the upper side, and ventilates the air to the first storage space S1 (see fig. 12 described later). The fan 19 is supplied with electric power from the third circuit board 24 via the cable 26.

The heat sink 7 has a plurality of first fins 27. Each first fin 27 is formed to protrude rightward from a bottom 35 (see fig. 9 described later). The plurality of first fins 27 are provided above the fan housing portion 21, and each of the first fins 27 extends in the up-down direction. The plurality of first fins 27 are juxtaposed at intervals in the front-rear direction. The fan 19 sucks air from below and ventilates the air between the first fins 27. An exhaust port 29 formed by a plurality of slits is formed in the upper plate portion 15, and air passing between the first fins 27 is discharged to the outside through the exhaust port 29 and the like. The circuit member 33 provided on the first circuit board 31 is provided so as to be in contact with the bottom 35 of the first fin 27 (see fig. 9 described later). A heat conductive member such as a heat conductive sheet may be provided between the circuit member 33 and the bottom portion 35. The circuit member 33 is, for example, a switching element, but may be another circuit member that generates heat. The plurality of first fins 27 dissipate heat generated by the circuit member 33 and cool the heat.

A ventilation space 37 (see fig. 9 described later) is provided between the right cover 3 and the end portion of the plurality of first fins 27 opposite to the bottom portion 35. The ventilation space 37 can ventilate air in a direction (for example, the front-rear direction) intersecting the extending direction of the first fins 27. In the ventilation space 37, the circuit part 39 is fixed to the first fin 27 by means of a screw 41. The circuit component 39 is, for example, a regenerative resistor, but may be another circuit component that generates heat. Further, the circuit member 39 may not be provided.

The heat sink 7 has a plurality of second fins 43 on the front side of the upper portions of the plurality of first fins 27. Each of the second fins 43 is formed so as to protrude rightward from a bottom 44 (see fig. 7 and 8 described later). The plurality of second fins 43 are arranged downstream of the circuit member 47 provided on the second circuit board 45 in the ventilation direction of air formed by a partition member 63 described later. The circuit component 47 is, for example, a capacitor, but may be another circuit component that generates heat. The circuit member 47 is an example of the first circuit member. The plurality of second fins 43 are juxtaposed at intervals in the front-rear direction. Air discharged from the fan 19 and ventilated around the circuit part 47 ventilates between the second fins 43. The right cover 3 is formed with an exhaust port 49 formed by a plurality of slits, and air passing between the second fins 43 is discharged to the outside through the exhaust port 49 and the like. The circuit member 51 is provided so as to be in contact with a mounting portion (not shown) formed at the bottom portion 44 of the second fin 43 via a screw 53. A heat conductive member such as a heat conductive sheet may be provided between the circuit member 51 and the mounting portion. The circuit component 51 is, for example, a rectifier diode, but may be another circuit component that generates heat. The plurality of second fins 43 radiate heat generated by the circuit member 51 and cool the heat.

A metal fitting 54 (see fig. 9 described later) is fixed to the right side of the front plate 11 of the radiator 7 by a screw 52. The metal material 54 is provided in contact with a circuit member 58 of the third circuit board 24 via a heat conduction member 56 such as a heat conduction sheet (see fig. 12 described later). The heat conductive member 56 is made of an elastic member such as rubber, and can absorb tolerance, positional error, and the like of the member, and the heat conductive member 56 and the circuit member 58 are brought into close contact with each other. The circuit component 58 is, for example, a resistor, but may be another circuit component that generates heat. The heat of the circuit member 58 of the third circuit board 24 is transferred to the front plate portion 11 via the heat conduction member 56 and the metal material 54, and is radiated.

The first circuit board 31 is fixed to the left side of the heat sink 7 by a plurality of screws 55. As described above, the plurality of circuit members 33 are provided on the rear side of the right surface of the first circuit board 31 so as to be in contact with the bottom 35 of the first fin 27. Although not shown, the first circuit board 31 is provided with circuit components related to, for example, a converter for converting ac power supplied from an ac power supply into dc power, an inverter (including the circuit component 33) for converting dc power into ac power and supplying the ac power to the motor, a control circuit for controlling the inverter to convert electric power to control the motor, and the like.

The left cover 5 is fixed to the left side of the heat sink 7 so as to house the first circuit board 31 and the like.

The second circuit board 45 is fixed to a right-side region of the heat sink 7, which is a front side of the first fin 27. The front side portion of the second circuit board 45 is fixed to the heat sink 7 by a plurality of screws 61. The rear side portion of the second circuit board 45 is sandwiched between the partition member 63 and the heat sink 7, and is fixed to the heat sink 7 by common tightening together with the partition member 63 by a plurality of screws 65. As described above, the plurality of circuit members 47 are provided on the rear side of the right surface of the second circuit board 45. The circuit components 47 and other circuit components include, for example, circuit components related to a converter that converts ac power supplied from an ac power supply into dc power, an inverter that converts dc power into ac power and supplies the ac power to a motor, a control circuit that controls the inverter to convert electric power to control the motor, and the like.

As described above, the partition member 63 is fixed to the right side of the heat sink 7 by the plurality of screws 65 together with the second circuit board 45 disposed between the partition member 63 and the heat sink 7. The partition member 63 partitions the interior of the housing 10 into a first storage space S1 (see fig. 12 described later) and a second storage space S2 (see fig. 12 described later). Details of the partition member 63 will be described later.

The third circuit board 24 is fixed to the right side of the heat sink 7 by a plurality of screws 69 (see fig. 10 described later). The third circuit board 24 is disposed on the right side of the second circuit board 45 (see fig. 10 described later).

The right cover 3 is fixed to the right side of the heat sink 7 so as to house the second circuit board 45, the partition member 63, the third circuit board 24, and the like. The front panel 9 is fixed to the front sides of the right cover 3 and the left cover 5 via the engaging portion 81.

< 3 Structure of partition Member >

An example of the structure of the partition member 63 is described with reference to fig. 5 and 6. Fig. 5 is a perspective view showing an example of the structure of the partition member 63, and fig. 6 is a side view of the partition member 63 as seen from the right. Each direction shown in fig. 5 and 6 corresponds to the aforementioned fig. 1 to 4, and is a direction in which the partition member 63 is assembled to the motor control device 1.

As shown in fig. 5 and 6, the partition member 63 is a container-like member having a bottom 83, a communication portion 85, and a wall portion 87. The bottom portion 83 has a hole 89 through which the cylindrical circuit member 47 provided on the second circuit board 45 is inserted. In the present embodiment, since the second circuit board 45 is provided with, for example, three circuit members 47, the hole 89 is formed in a shape into which the three circuit members 47 can be inserted. The hole 89 is formed in a shape and a size that can form a slight gap with the outer peripheral surface of the circuit member 47. This allows tolerance, positional error, and the like of the components, and reduces leakage of air from the first storage space S1 to the second storage space S2. The number of the circuit members 47 may be one or more than three, and in this case, the hole 89 may be formed in a shape corresponding to the number of the circuit members 47.

The communication portion 85 has a first communication portion 85A and a second communication portion 85B. The first communication portion 85A is provided at an edge portion of the bottom portion 83 on the side of the first fin 27, and in this example, is provided at a rear side of the bottom portion 83. The second communication portion 85B is provided at an edge portion of the bottom portion 83 on the side of the second fin 43, and in this example, is provided at an edge portion of the bottom portion 83 on the upper side. The first communication portion 85A and the second communication portion 85B are provided so as to protrude rightward from the bottom 83. The protruding height of the first communication portion 85A is lower than the protruding height of the wall portion 87, and is, for example, approximately half the height (see fig. 9 described later). The first communication portion 85A forms a space 91 communicating with the ventilation space 37 described above between the right cover 3 and the distal end portion on the opposite side from the bottom portion 83. The air ventilated in the ventilation space 37 in the direction intersecting the extending direction of the first fins 27 flows into the partition member 63 via the space 91. The first communication portion 85A is an example of a communication portion.

The first communication portion 85A has an engaging portion 92 at a distal end portion opposite to the bottom portion 83. The engaging portion 92 is formed as a flange-like member protruding rearward and having a recess on the left side by bending and folding back the distal end portion, for example. The engagement portion 92 engages to cover the first fin 27 disposed on the side closest to the partition member 63, and the distal end portion of the first fin 27 disposed on the front side in this example, of the plurality of first fins 27 (see fig. 9 described later).

The protruding height of the second communication portion 85B is substantially the same as that of the first communication portion 85A. The second communication portion 85B forms a space 93 communicating with the space in which the second fin 43 is provided between the right cover 3 and the distal end portion on the opposite side of the bottom portion 83. The air flowing into the partition member 63 through the space 91 and flowing around the circuit member 47 flows out to the second fin 43 side through the space 93.

The partition member 63 has an air guide 95 at an upper end of the bottom 83. The air guide portion 95 is formed as a slope inclined from the bottom 83 toward the distal end portion of the second communication portion 85B. The air guide 95 guides the air flowing into the partition member 63 through the space 91 to the space 93 and flows out to the second fin 43 side.

The second communication portion 85B has an engagement portion 97 at a distal end portion opposite to the bottom portion 83. The engaging portion 97 is formed, for example, by bending and folding back the distal end portion, as a flange-like member protruding upward and having a concave portion on the left side. The engagement portion 97 engages with a distal end portion of a fin 99 (see fig. 7 described later) extending in the front-rear direction below the second fin 43 in the heat sink 7.

The wall 87 is erected so as to protrude rightward from the edge of the bottom 83 other than the communication portion 85, in this example, the front edge and the lower edge of the bottom 83, and reaches the vicinity of the right cover 3. The protruding height of the wall portion 87 is a height slightly smaller than the distance between the bottom 83 of the partition member 63 and the right cover 3. A slight gap is formed between the distal end portion of the wall portion 87 and the inner surface of the right cover 3 (see fig. 12 described later). This allows tolerance, positional error, and the like of the components, and reduces leakage of air from the first storage space S1 to the second storage space S2. The wall portion 87 has a front side wall portion 87A and a lower side wall portion 87B. The front side wall 87A is a flat plate-like wall that is tangentially close to the outer peripheral surfaces of the three circuit members 47 protruding from the hole 89. The lower side wall 87B is a curved wall that is close to substantially the lower half of the outer peripheral surface of the lowest circuit member 47 among the three circuit members 47. The lower side wall 87B is located below the first communication portion 85A. The partition member 63 is configured such that a part of the circuit member 47 located at the lowermost side protrudes downward from the first communication portion 85A, thereby securing a space for installing the air guide portion 95.

Screw fixing portions 101 through which the screws 65 are inserted are provided at two positions in the up-down direction on the rear side of the bottom 83 and at the front side of the lower portion of the lower side wall portion 87B. In this example, 3 screws 65 are inserted through screw fixing portions 101, through holes 103 (see fig. 7 described later) formed in second circuit board 45, and fastened to screw holes of heat sink 7.

According to the above-described structure, the partition member 63 partitions the interior of the housing 10 into the first accommodation space S1 and the second accommodation space S2. As shown in fig. 12, which will be described later, the first housing space S1 houses a plurality of first fins 27 and the circuit member 47. The second accommodation space S2 accommodates circuit components other than the circuit component 47 of the second circuit substrate 45, the first circuit substrate 31, the third circuit substrate 24, and the like. The partition member 63 is integrally molded by, for example, molding by injecting molten resin into a mold. Since the degree of freedom in shape is improved by resin molding, various functions can be added to the partition member 63 in addition to the space partition function.

< 4. Method of mounting partition Member >

An example of a method of attaching the partition member 63 will be described with reference to fig. 7 to 10. Fig. 7 is a diagram showing an example of a state in which the second circuit board 45 is fixed to the heat sink 7 in the assembly process of the motor control device 1, fig. 8 is a diagram showing an example of a state in which the partition member 63 is fixed to the heat sink 7 from above the second circuit board 45, fig. 9 is a cross-sectional view corresponding to the section IX-IX in fig. 8, and fig. 10 is a diagram showing an example of a state in which the third circuit board 24 is fixed to the heat sink 7.

As shown in fig. 7, the second circuit board 45 is fixed to the right side of the heat sink 7 in the area of the front side of the first fin 27 by a plurality of (e.g., four) screws 61. Next, as shown in fig. 8 and 9, the partition member 63 is mounted on the heat sink 7 so as to sandwich the second circuit board 45. At this time, the engaging portion 92 of the first communicating portion 85A of the partition member 63 is engaged so as to cover the distal end portion of the first fin 27 disposed on the side closest to the partition member 63 among the plurality of first fins 27. The engagement portion 97 of the second communication portion 85B of the partition member 63 is engaged so as to cover the distal end portion of the fin 99. This allows the partition member 63 to be positioned with respect to the heat sink 7 and the second circuit board 45, thereby facilitating assembly and improving workability. Then, a plurality of (e.g., 3) screws 65 are inserted through the screw fixing portions 101 of the partition members 63 and the through holes 103 of the second circuit board 45, and fastened to the screw holes of the heat sink 7. Thereby, the partition member 63 is fixed to the heat sink 7 together with the second circuit board 45 disposed between the partition member 63 and the heat sink 7. The method of attaching the partition member 63 is an example of a method of manufacturing the motor control device 1.

Then, as shown in fig. 10, the third circuit substrate 24 is fixed to the heat sink 7 at the more right side of the second circuit substrate 45 by means of a plurality of screws 69. The third circuit board 24 is disposed in a region on the front side of the wall 87 of the partition member 63. A cable 26 for supplying power to the fan 19 is connected to the third circuit board 24. The circuit member 39 is fixed to the first fin 27 by means of a screw 41. The circuit member 39 may not be provided. When the circuit member 39 is provided, a part of the air discharged upward from the fan 19 can be brought into contact with the lower end surface of the circuit member 39 to change the flow forward, and therefore, there is an effect that the air can be easily introduced to the partition member 63 side.

< 5 Structure of inner side of Right cover and mounting method >

An example of the structure and the mounting method of the inner side of the right cover 3 will be described with reference to fig. 11 and 12. Fig. 11 is a perspective view showing an example of the structure of the inner side of the right cover 3, and fig. 12 is a cross-sectional view corresponding to the cross-section IX-IX in fig. 8 in a state where the right cover 3 is attached to the radiator 7 in the assembly process of the motor control apparatus 1. Each direction shown in fig. 11 corresponds to the aforementioned fig. 1 to 4, and is a direction in which the right cover 3 is assembled to the motor control device 1.

As shown in fig. 12, the right cover 3 has a top plate portion 3A disposed on the opposite side of the wall portion 87 of the partition member 63 from the bottom portion 83. The top plate 3A forms the right side surface of the housing 10. As shown in fig. 11, the top plate 3A has protrusions 107, 109, 111 on its inner surface. The protruding portion 107 extends along the shape of the distal end portion of the wall portion 87 of the partition member 63. As shown in fig. 12, when the right cover 3 is attached to the radiator 7, the protruding portion 107 is provided so as to overlap the distal end portion of the wall portion 87 by a predetermined amount when viewed from the direction (front-rear direction, up-down direction) parallel to the top plate portion 3A. Some gaps are formed between the distal end portion of the wall portion 87 and the inner surface of the top plate portion 3A, and between the wall portion 87 and the protruding portion 107. This allows tolerance, positional error, and the like of the components without bringing the distal end portion of the wall portion 87 into contact with the protruding portion 107 of the top plate portion 3A, and reduces leakage of air from the first storage space S1 to the second storage space S2 by forming a labyrinth structure.

The protruding portion 109 is provided to extend linearly in the front-rear direction, and has a length substantially equal to the front-rear dimension of the fan housing portion 21. The protruding portion 109 abuts against the fan 19 when the fan 19 is accommodated in the fan accommodating portion 21, and positions the fan 19. The protruding portion 111 is provided to extend linearly in the up-down direction, has a length substantially equal to the up-down dimension of the second fin 43, and has a protruding height substantially equal to the protruding height of the second fin 43. The protruding portion 111 is interposed between the plurality of second fins 43, and prevents air from leaking from the first storage space S1 to the second storage space S2 in the installation region of the second fins 43.

The right cover 3 is mounted to the radiator 7 as follows: the protruding portion 107 extending along the shape of the wall portion 87 of the partition member 63 overlaps with the distal end portion of the wall portion 87 on the inner surface of the top plate 3A when viewed in the direction parallel to the top plate 3A. The method of attaching the right cover 3 is an example of a method of manufacturing the motor control device 1.

Effect of the embodiment ]

As described above, in the motor control device 1 of the present embodiment, the interior of the housing 10 is partitioned into the first accommodation space S1 and the second accommodation space S2 by the partition member 63. The first accommodation space S1 accommodates the plurality of first fins 27 of the heat sink 7 and the circuit members 47 of the second circuit board 45. The second accommodation space S2 accommodates circuit components other than the circuit component 47 of the second circuit substrate 45, the first circuit substrate 31, the third circuit substrate 24, and the like. The air is ventilated to the first accommodation space S1 by the fan 19. As a result, the circuit member 47 provided on the second circuit board 45 can be sufficiently cooled in addition to the circuit member 33 to be cooled by the first fins 27. Therefore, even when a circuit component generating heat different from the cooling target of the radiator 7 is provided on the circuit board, cooling can be performed, and therefore, the cooling performance of the motor control device 1 can be improved.

In the present embodiment, the first storage space S1 may have a ventilation space 37, and the ventilation space 37 may be provided between the distal ends of the plurality of first fins 27 and the right cover 3, so that air may be ventilated in a direction intersecting the extending direction of the first fins 27. In this case, the air ventilated by the fan 19 ventilates in the extending direction of the first fins 27 to cool the first fins 27, and ventilates in a direction intersecting the extending direction of the first fins 27 via the ventilation space 37. This allows the air to flow into the circuit member 47. Therefore, the cooling effect of the circuit member 47 can be improved.

In the present embodiment, the partition member 63 may include: a bottom portion 83 formed with a hole portion 89 through which the power supply circuit member 47 is inserted; a first communication portion 85A provided at an edge portion of the bottom portion 83 on the side of the first fin 27, and forming a space into which air flows; and a wall 87 that is provided so as to stand up from the edge of the bottom 83 other than the communication portion 85 to the vicinity of the right cover 3. In this case, the air ventilated by the fan 19 flows into the circuit member 47 side protruding from the bottom 83 of the partition member 63 via the first communication portion 85A of the partition member 63. In the first accommodation space S1, there is no partition between the installation space of the first fins 27 and the installation space of the circuit member 47, and therefore, a large amount of air can be caused to flow from the first fins 27 to the circuit member 47 side. Thus, the cooling effect of the circuit component 47 can be improved. In the case where the circuit member 47 is a capacitor, for example, the capacitor can be miniaturized by improving the cooling effect.

In the present embodiment, the top plate 3A of the right cover 3 may have a protruding portion 107 on the inner surface, and the protruding portion 107 may extend along the shape of the wall 87 of the partition member 63 and protrude so as to overlap with the distal end portion of the wall 87 when viewed in a direction parallel to the top plate 3A. In this case, by overlapping the distal end portion of the wall portion 87 with the protruding portion 107, a labyrinth structure can be formed. This can reduce leakage of air from the first storage space S1 to the second storage space S2, and thus can improve cooling efficiency of the first storage space S1. In addition, the circuit components other than the circuit component 47 provided on the second circuit board 45, the first circuit board 31, the third circuit board 24, and the like can be protected from moisture, oil, dust, and the like contained in the air. Further, a minute gap can be provided without bringing the wall portion 87 of the partition member 63 into contact with the protruding portion 107 of the top plate 3A. This allows tolerance, positional error, and the like of the components, and facilitates design and manufacturing.

In the present embodiment, the first communicating portion 85A of the partition member 63 may have an engaging portion 92 that engages with the distal end portion of the first fin 27 disposed on the side of the partition member 63 among the plurality of first fins 27. In this case, the engaging portion 92 engages with the distal end portion of the first fin 27 when the partition member 63 is attached, and the partition member 63 can be easily positioned. This facilitates assembly and improves workability.

In the present embodiment, the partition member 63 may be fixed to the heat sink 7 together with the second circuit board 45 disposed between the partition member 63 and the heat sink 7 by the screws 65. In this case, the partition member 63 and the second circuit board 45 can be fixed by common fastening, so that assembly is easy, and members such as screws can be reduced.

In the present embodiment, the heat sink 7 may have a plurality of second fins 43 disposed downstream of the circuit member 47 in the air ventilation direction, in addition to the plurality of first fins 27. In this case, the circuit member 51 to be cooled by the second fin 43 can be cooled in addition to the circuit member 33 to be cooled by the first fin 27 and the circuit member 47 of the second circuit board 45, and the cooling performance of the motor control device 1 can be further improved.

In the present embodiment, the partition member 63 may have an air guide 95 for guiding air to the second fins 43. In this case, the air flowing from the first fin 27 side to the circuit member 47 side can be guided to the second fin 43 by the air guide 95. This can efficiently cool the circuit member 51 to be cooled by the second fin 43, and can further improve the cooling performance of the motor control device 1.

< 7. Modification >

The disclosed embodiments are not limited to the above, and various modifications can be made without departing from the spirit and technical ideas thereof.

In the above embodiment, the fan 19 sucks air from the lower side and discharges the air to the upper side, thereby ventilating the air up to the first storage space S1, but conversely, the fan 19 may suck air from the upper side and discharge the air to the lower side, thereby ventilating the air down to the first storage space S1.

In the above embodiment, the fan 19 is provided on the lower side of the first fin 27, but the fan 19 may be provided on the upper side of the first fin 27. In this case, the ventilation direction of the air in the first storage space S1 may be either an upward direction or a downward direction.

For example, a discharge port capable of discharging water, oil, dust, or the like may be provided at a lower portion of the partition member 63. The partition member 63 is disposed in a vertically oriented direction in the longitudinal direction, and therefore moisture, oil, dust, and the like contained in the air ventilated inside are likely to accumulate inside the lower side wall portion 87B below. Therefore, for example, by providing an openable and closable discharge port at the lowermost position of the lower side wall portion 87B, the discharge port can be opened at the time of maintenance, and water, oil, dust, and the like accumulated in the bottom portion of the partition member 63 can be discharged.

The above description has been given taking the case where the electronic device is a motor control device as an example, but the above description may be applied to a control device that controls a machine other than a motor. In addition, the present utility model is applicable to any electronic device provided with a cooling fan, a heat sink, a circuit board, and the like, even if the device is not a control device.

In the above description, when there are descriptions of "vertical", "parallel", "plane", and the like, the descriptions are not strictly meant. These terms "vertical", "parallel", "plane" and "parallel" refer to tolerances and errors in design and manufacture, and mean "substantially vertical", "substantially parallel" and "substantially plane".

In the above description, when the descriptions of the dimensions, sizes, shapes, positions, and the like in the appearance are "identical", "same", "equal", "different", and the like, the descriptions are not strictly meant. The terms "identical," same, "" equal, "and" different "are used to indicate that the same or different elements are" substantially identical, "" substantially equal, "or" substantially different.

In addition to the above, the methods of the above embodiments and modifications may be appropriately combined and used. Although not shown, the above embodiments and modifications are implemented with various modifications within the scope of the present utility model.

The problems and effects to be solved by the embodiments and modifications described above are not limited to the above. The embodiments and modifications may solve the problems not described above, or may exhibit the effects not described above, and may solve only part of the problems described above, or may exhibit only part of the effects described above.

Claims

1. An electronic device, characterized in that the electronic device has:

a housing;

a heat sink having a plurality of first fins;

a circuit substrate provided with a plurality of circuit components including a first circuit component;

a partition member that partitions an interior of the case into a first accommodation space in which the plurality of first fins and the first circuit member are accommodated and a second accommodation space in which the circuit member other than the first circuit member is accommodated; and

and a fan for ventilating air to the first storage space.

2. The electronic device of claim 1, wherein the electronic device comprises a memory device,

the first housing space has a ventilation space provided between the distal end portions of the plurality of first fins and the housing, and is configured to allow ventilation of the air in a direction intersecting the extending direction of the first fins.

3. The electronic device of claim 1, wherein the electronic device comprises a memory device,

the partition member has:

a bottom portion formed with a hole portion through which the first circuit member is inserted;

a communication portion provided at an edge portion of the bottom portion on the first fin side, the communication portion forming a space into which the air flows; and

and a wall portion that is provided so as to stand up from the edge portion of the bottom portion other than the communication portion to the vicinity of the housing.

4. The electronic device of claim 3, wherein the electronic device comprises a plurality of electronic devices,

the housing has a top plate portion disposed on a side of the wall portion of the partition member opposite to the bottom portion,

the top plate portion has a protruding portion on the inner surface, the protruding portion extending along the shape of the wall portion and protruding so as to overlap with the distal end portion of the wall portion when viewed in a direction parallel to the top plate portion.

5. The electronic device of claim 4, wherein the electronic device comprises a memory device,

the communication portion has an engagement portion that engages with the distal end portion of the first fin disposed closest to the partition member among the plurality of first fins.

6. The electronic device of claim 5, wherein the electronic device comprises a memory device,

the partition member is fixed to the heat sink by screws together with the circuit board disposed between the partition member and the heat sink.

7. The electronic device of claim 1, wherein the electronic device comprises a memory device,

the heat sink has a plurality of second fins arranged on a downstream side of the first circuit member in a ventilation direction of the air.

8. The electronic device of claim 7, wherein the electronic device comprises a memory device,

the partition member has an air guide portion for guiding the air to the second fin.