JP2001332880A - Sealed housing structure of motor driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance heat dissipation efficiency of a sealed housing structure for motor driver while sustaining its sealability without altering the external dimensions significantly. SOLUTION: A sealed housing structure 11 for motor driver comprises a sealed housing 12, and a metallic partitioner 14 dividing the inner space 13 vertically into two wherein outer air flows from one of vents 12e, 12f made in the left and right sidewalls of a housing 12 into a vent 14c made in the partitioner 14 and flows out from the other vent. Surface area in the housing can be increased while sustaining its sealability without altering the external shape of the housing significantly and heat dissipation efficiency of the housing can be enhanced significantly because air can be passed through.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed housing structure for a motor driver, and more particularly to an improvement in heat radiation efficiency.

[0002]

2. Description of the Related Art As a housing structure of a motor driver of an electric motor, there are an open housing structure with air holes for heat radiation and a closed housing structure. In the closed housing structure, since there is substantially no air flow between the inside and the outside of the housing, heat generated inside is discharged to the outside exclusively through the housing. For this reason, heat dissipation efficiency is generally lower than that of an open housing structure that can expect heat dissipation by air circulation.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sealed housing structure without impairing the sealing performance.
Another object of the present invention is to improve the heat radiation without significantly changing the outer shape of the housing.

[0004]

In order to solve the above-mentioned problems, a sealed housing structure of a motor driver according to the present invention includes a sealed housing and an inner surface of the housing. A heat conductive partition plate that substantially divides the internal space of the housing into two.

Here, it is desirable that the partition plate is a metal noise shield plate.

Further, it is preferable that a ventilation hole is formed inside the partition plate, and the ventilation hole communicates with the outside through a ventilation hole formed in the housing.

In this case, the housing has a pair of opposed wall portions facing each other, the partition plate is bridged between the opposed wall portions, and the ventilation hole is formed in the opposed wall portion, It is preferable that the partition plate is provided with the ventilation holes whose both ends are respectively connected to the ventilation holes.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a motor driver according to an embodiment of the present invention;

(First Embodiment) FIGS. 1 (a) and 1 (b)
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating an example of a closed casing structure of a motor driver according to the present invention, and a central cross-sectional view illustrating a portion cut along line bb. As shown in these figures, a closed casing structure 1 of the motor driver of the present embodiment includes a casing 2 having a rectangular parallelepiped shape as a whole, and the casing internal space 3 is a substantially closed space. Here, an element such as an FET as a switching element constituting the motor driver, a circuit board, and the like are mounted.

The casing internal space 3 is substantially vertically divided into two parts by a rectangular metal partition plate 4 having a constant thickness, and an upper space 3u and a lower space 3d are defined. The partition plate 4 has the left and right long side end surfaces 4a, 4b and the front end surface 4c in close contact with the inner surfaces of the left and right side wall portions 2a, 2b and the inner surface of the front end wall portion 2c in the housing 2, respectively. And is fixed to the housing 2.

In the housing structure 1 of the present embodiment configured as described above, the partition plate 4 is placed inside the housing structure 1 so as to have a cross-section in the shape of a "sun". Therefore, it is possible to increase the surface area inside the housing without largely changing the outer shape of the housing and to maintain the airtightness, thereby improving the heat radiation efficiency. Further, since the area where the heat-generating components constituting the motor driver are brought into contact with the inner surface of the housing or the surface of the partition plate can be increased, the heat conductivity from the heat-generating components to the outside can be improved, and the heat-dissipation efficiency of the entire housing can be improved be able to.

Further, since the casing internal space 3 is divided into upper and lower parts by the partition plate 4, heat generated in one space is hardly transmitted to the other space. Therefore, it is possible to thermally separate motor drive components in the same housing by arranging, for example, a component having poor heat resistance and a heat-generating component in different spaces.

In addition, since the partition plate is made of metal, it also functions as a noise shield plate. Therefore, it is possible to suppress the noise generated from the components installed in one space from adversely affecting the components installed in the other space.

(Second Embodiment) FIGS. 2A and 2B show
FIG. 7 is a schematic diagram showing a closed casing structure of a motor driver according to a second embodiment of the present invention, and a central cross-sectional view showing a portion cut along the line bb. As shown in these drawings, the closed casing structure 11 of the motor driver of the present embodiment also includes a casing 12 having a rectangular parallelepiped shape as a whole, and the casing internal space 13 is a substantially closed space. Here, an element such as an FET as a switching element constituting the motor driver, a circuit board, and the like are mounted.

The casing internal space 13 is substantially vertically divided into two parts by a rectangular metal partition plate 4.
3u and a lower space 13d are defined. A ventilation hole 14c is formed inside the partition plate 4 of this example. The partition plate 14 of this configuration has a front end surface 14a in the long side direction.
Is fixed to the housing 12 in a state of being tightly fixed to the inner side surface of the front end wall portion 12 a of the housing 12.

Here, left and right side wall portions 12 of the housing 12 are formed.
In c and 12d, elongated ventilation holes 12e and 12f communicating with both ends of the ventilation hole 14c of the partition plate 14 are formed. Therefore, in this example, the ventilation holes 1 formed inside the partition plate 14 from one side of the housing 12 to the other side are formed.
An air flow passage passing through 4c is formed.

In the housing structure 11 of the present embodiment configured as described above, the partitioning plate 14 is inserted thereinto to partition it while maintaining the hermetically sealed structure, thereby forming a flow passage through which air is circulated using the partitioning plate. Is formed. Accordingly, the surface area can be increased without largely changing the outer shape of the housing, so that the heat radiation efficiency can be improved.

Further, since air can be circulated through the interior of the partition plate 14, the heat radiation efficiency can be further improved while maintaining the hermeticity of the housing 2.

In addition, as in the case of the first embodiment, since the casing internal space 13 is divided into upper and lower parts by a partition plate 14, heat generated in one space is dissipated by the other space. It is hard to reach. Therefore, it is possible to thermally separate motor drive components in the same housing by arranging, for example, a component having poor heat resistance and a heat-generating component in different spaces. Further, since the partition plate is made of metal, it functions as a noise shield plate. Therefore, it is possible to suppress the noise generated from the components installed in one space from adversely affecting the components installed in the other space.

(Other Embodiments) The shape of the partition plate and the shape of the housing are not limited to the above examples. It is also possible to arrange a plurality of partition plates to partition the inside of the housing into a plurality of spaces. Further, a material having thermal conductivity may be used for the partition plate. In addition, the air passage formed in the partition plate may have a plurality of branched structures.

[0021]

As described above, in the closed casing structure of the motor driver of the present invention, the inside is divided into two by the heat conductive partition plate. Therefore, while maintaining the hermeticity of the housing, without greatly changing its outer shape,
The heat dissipation efficiency of the housing can be improved by increasing the surface area inside the housing.

Further, according to the structure of the present invention, the partition plate can be used as a noise shield plate. Therefore, since it is not necessary to arrange a separate member as the noise shield plate, the size of the housing is not increased and the number of components is not increased.

Further, according to the present invention, a ventilation hole is formed inside the partition plate to allow the outside air to flow through the partition plate. The heat radiation efficiency of the housing can be improved without a significant change.

[Brief description of the drawings]

FIGS. 1A and 1B are a schematic diagram showing a closed casing structure of a motor driver according to a first embodiment to which the present invention is applied, and a central sectional view thereof.

FIGS. 2A and 2B are a schematic diagram showing a closed casing structure of a motor driver according to a second embodiment to which the present invention is applied, and a central sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Enclosed case structure of motor driver 2, 12 Case 2a, 2b Side wall part 2c Front end wall part 12a Front end wall part 12c, 12d Vent 12d, 12e Side wall part 3, 13 Case internal space 3u, 13u Upper space 3d, 13d Lower space 4, 14 Partition plate 4a, 4b Side surface 4c Front end surface 14a Front end surface 14c Vent holes 14e, 14f Opening

Claims (4)

[Claims] 1. A closed-type housing, and a thermally conductive partition plate attached to an inner surface of the housing and substantially bisecting an internal space of the housing. A sealed housing structure for a motor driver. 2. The sealed housing structure for a motor driver according to claim 1, wherein the partition plate is a metal noise shield plate. 3. The air conditioner according to claim 1, wherein a ventilation hole is formed inside the partition plate, and the ventilation hole communicates with the outside through a ventilation hole formed in the housing. Features a sealed housing structure for motor drivers. 4. The device according to claim 3, wherein the housing includes a pair of opposed wall portions facing each other, the partition plate is bridged between the opposed wall portions, and the ventilation hole is provided in the opposed wall portion. Is formed, and the partition plate includes:
A closed casing structure for a motor driver, wherein the ventilation holes are formed such that both ends thereof communicate with the ventilation holes.